阅读说明：本技术 一种通信设备及滤波器 (Communication equipment and filter ) 是由 刘建伟 于 2020-05-20 设计创作，主要内容包括：本申请公开了一种通信设备及其滤波器,滤波器包括壳体；滤波支路,设置在壳体上,由依次耦合的十一个滤波腔组成；滤波支路的第一滤波腔与第三滤波腔之间感性交叉耦合,形成滤波支路的一个感性交叉耦合零点；滤波支路的第四滤波腔与第六滤波腔、滤波支路的第七滤波腔与第九滤波腔、滤波支路的第七滤波腔与第十滤波腔之间分别容性交叉耦合,形成滤波支路的三个容性交叉耦合零点；其中,滤波支路的带宽范围为2515MHz-2675MHz。本申请滤波器能够实现2515MHz-2675MHz带宽的滤波；同时滤波器形成一个感性耦合零点和三个容性交叉耦合零点,能够实现对滤波器带宽的强抑制效果,提高滤波器的阻带抑制性能。(The application discloses a communication device and a filter thereof, wherein the filter comprises a shell; the filtering branch is arranged on the shell and consists of eleven filtering cavities which are sequentially coupled; the first filtering cavity and the third filtering cavity of the filtering branch are inductively coupled in a cross mode to form an inductive cross coupling zero point of the filtering branch; the fourth filtering cavity and the sixth filtering cavity of the filtering branch, the seventh filtering cavity and the ninth filtering cavity of the filtering branch, and the seventh filtering cavity and the tenth filtering cavity of the filtering branch are respectively in capacitive cross coupling to form three capacitive cross coupling zeros of the filtering branch; the bandwidth range of the filtering branch circuit is 2515MHz-2675 MHz. The filter can realize filtering with a bandwidth of 2515MHz-2675 MHz; meanwhile, the filter forms an inductive coupling zero and three capacitive cross coupling zeros, so that the strong suppression effect on the bandwidth of the filter can be realized, and the stop band suppression performance of the filter is improved.)

1. A filter, characterized in that the filter comprises:

a housing;

the filtering branch is arranged on the shell and consists of eleven filtering cavities which are sequentially coupled;

the first filter cavity and the third filter cavity of the filter branch circuit are inductively coupled in a cross mode to form an inductive cross coupling zero point of the filter branch circuit;

the fourth filtering cavity and the sixth filtering cavity of the filtering branch, the seventh filtering cavity and the ninth filtering cavity of the filtering branch, and the seventh filtering cavity and the tenth filtering cavity of the filtering branch are respectively in capacitive cross coupling to form three capacitive cross coupling zeros of the filtering branch;

the bandwidth range of the filtering branch circuit is 2515MHz-2675 MHz.

2. The filter according to claim 1, wherein the seventh filter cavity and the tenth filter cavity of the filter branch are capacitively cross-coupled to form two capacitively cross-coupled zeros of the filter branch.

3. The filter of claim 1,

the shell is provided with a first direction and a second direction which are perpendicular to each other, and the eleven filter cavities of the filter branch circuit are divided into four rows arranged along the first direction;

the second filtering cavity, the sixth filtering cavity and the tenth filtering cavity of the filtering branch are in a row and are sequentially arranged along the second direction;

the first filtering cavity, the fourth filtering cavity, the seventh filtering cavity and the eleventh filtering cavity of the filtering branch are in a row and are sequentially arranged along the second direction;

the third filtering cavity, the fifth filtering cavity and the ninth filtering cavity of the filtering branch are in a row and are sequentially arranged along the second direction;

and the eighth filtering cavities of the filtering branches are in one row.

4. The filter of claim 3,

the projection of the center of the third filter cavity of the filter branch in the second direction is coincident with the projection of the center of the second filter cavity of the filter branch in the second direction;

the projection of the center of the fifth filtering cavity of the filtering branch in the second direction is coincident with the projection of the center of the sixth filtering cavity of the filtering branch in the second direction;

the projection of the center of the eighth filtering cavity of the filtering branch in the second direction is coincident with the projection of the center of the seventh filtering cavity of the filtering branch in the second direction;

the projection of the center of the ninth filtering cavity of the filtering branch in the second direction is coincident with the projection of the center of the tenth filtering cavity of the filtering branch in the second direction.

5. The filter according to claim 1, wherein a flying bar is arranged between the fourth and sixth filter cavities of the filter branch, between the seventh and ninth filter cavities of the filter branch, and between the seventh and tenth filter cavities of the filter branch.

6. The filter according to claim 1, wherein metal coupling ribs are disposed between the first filter cavity and the third filter cavity of the filter branch, between the second filter cavity and the third filter cavity of the filter branch, between the third filter cavity and the fourth filter cavity of the filter branch, between the fourth filter cavity and the fifth filter cavity of the filter branch, and between the eighth filter cavity and the ninth filter cavity of the filter branch.

7. The filter according to claim 1, wherein the eleven filter cavities are arranged adjacent to each other in sequence along the main coupling path, and any group of adjacent filter cavities are coupled through the window.

8. The filter of claim 1, wherein the filter cavity is provided with:

the resonance rod comprises a U-shaped side wall and a hollow inner cavity formed by the U-shaped side wall;

a tuning rod, one end of the tuning rod being disposed within the hollow interior.

9. The filter of claim 8, wherein the housing is provided with a mounting seat, and the U-shaped sidewall is fixed to the mounting seat.

10. A communication device, characterized in that the communication device comprises an antenna and a radio frequency unit connected with the antenna; the radio frequency unit comprising a filter according to any of claims 1-9 for filtering a radio frequency signal.

Technical Field

The present application relates to the field of communications technologies, and in particular, to a communication device and a filter.

Background

The cavity filter is a key device of a modern mobile communication system and is widely applied to wireless communication base stations and various communication terminals; the cavity filter is composed of a radio frequency connector, a cavity, a cover plate, a plurality of resonator units and a frequency tuning and coupling strength adjusting component, wherein the resonant frequencies of the plurality of resonator units are distributed in the passband range, and the cavity filter has a blocking function on signals outside the resonant frequencies, so that the function of selecting microwave transmission signals is realized; the cavity filter has the advantages of reliable structure, wide filtering frequency band, parasitic pass band far away from a channel, high Q value, stable electrical property, good heat dissipation performance and the like.

The inventor of the present application finds, in long-term research and development work, that the stop band rejection performance of the existing cavity filter is poor.

Disclosure of Invention

The application provides a communication device and a filter thereof, which are used for improving the stop band suppression performance of the filter.

In order to solve the above technical problem, the present application provides a filter, including: a housing; the filtering branch is arranged on the shell and consists of eleven filtering cavities which are sequentially coupled; the first filtering cavity and the third filtering cavity of the filtering branch are inductively coupled in a cross mode to form an inductive cross coupling zero point of the filtering branch; the fourth filtering cavity and the sixth filtering cavity of the filtering branch, the seventh filtering cavity and the ninth filtering cavity of the filtering branch, and the seventh filtering cavity and the tenth filtering cavity of the filtering branch are respectively in capacitive cross coupling to form three capacitive cross coupling zeros of the filtering branch; the bandwidth range of the filtering branch circuit is 2515MHz-2675 MHz.

And the seventh filtering cavity and the tenth filtering cavity of the filtering branch are capacitively and cross-coupled to form two capacitive cross-coupling zeros of the filtering branch.

The shell is provided with a first direction and a second direction which are perpendicular to each other, and eleven filter cavities of the filter branch circuit are divided into four rows arranged along the first direction; the second filtering cavity, the sixth filtering cavity and the tenth filtering cavity of the filtering branch are in a row and are sequentially arranged along the second direction; the first filtering cavity, the fourth filtering cavity, the seventh filtering cavity and the eleventh filtering cavity of the filtering branch are in a row and are sequentially arranged along the second direction; the third filtering cavity, the fifth filtering cavity and the ninth filtering cavity of the filtering branch are in a row and are sequentially arranged along the second direction; the eighth filtering cavities of the filtering branch circuits are in one row.

The projection of the center of the third filter cavity of the filter branch circuit in the second direction is superposed with the projection of the center of the second filter cavity of the filter branch circuit in the second direction; the projection of the center of the fifth filtering cavity of the filtering branch circuit in the second direction is superposed with the projection of the center of the sixth filtering cavity of the filtering branch circuit in the second direction; the projection of the center of the eighth filtering cavity of the filtering branch circuit in the second direction is superposed with the projection of the center of the seventh filtering cavity of the filtering branch circuit in the second direction; the projection of the center of the ninth filtering cavity of the filtering branch in the second direction is coincident with the projection of the center of the tenth filtering cavity of the filtering branch in the second direction.

And flying rods are arranged between the fourth filtering cavity and the sixth filtering cavity of the filtering branch, between the seventh filtering cavity and the ninth filtering cavity of the filtering branch and between the seventh filtering cavity and the tenth filtering cavity of the filtering branch.

And metal coupling ribs are arranged between the first filtering cavity and the third filtering cavity of the filtering branch, between the second filtering cavity and the third filtering cavity of the filtering branch, between the third filtering cavity and the fourth filtering cavity of the filtering branch, between the fourth filtering cavity and the fifth filtering cavity of the filtering branch and between the eighth filtering cavity and the ninth filtering cavity of the filtering branch.

Eleven filter cavities are sequentially and adjacently arranged along the main coupling path, and any group of adjacent filter cavities are coupled through a window.

Wherein, be provided with in the filtering cavity: the resonance rod comprises a U-shaped side wall and a hollow inner cavity formed by the U-shaped side wall; and one end of the tuning rod is arranged in the hollow inner cavity.

Wherein, be provided with the mount pad on the casing, the U-shaped lateral wall is fixed on the mount pad.

In order to solve the above technical problem, the present application provides a communication device, which includes an antenna and a radio frequency unit connected to the antenna; the radio frequency unit comprises a filter as described above for filtering the radio frequency signal.

The beneficial effect of this application is: compared with the prior art, the filter can realize filtering with a bandwidth of 2515MHz-2675 MHz; meanwhile, the filter forms an inductive coupling zero and three capacitive cross coupling zeros, so that the strong suppression effect on the bandwidth of the filter can be realized, and the stop band suppression performance of the filter is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of an embodiment of a filter according to the present application;

FIG. 2 is a schematic of the topology of the filter of the present application;

FIG. 3 is a schematic structural diagram of the combined structure of the filter cavity, the tuning rod and the resonant rod of FIG. 1;

FIG. 4 is a schematic diagram of an equivalent circuit structure of the filter of the present application;

FIG. 5 is a schematic diagram of a simulated structure of a filter according to the present application;

fig. 6 is a schematic structural diagram of an embodiment of the communication device of the present application.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present application, the communication device and the filter provided in the present application are described in further detail below with reference to the accompanying drawings and the detailed description. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first", "second", etc. in this application are used to distinguish between different objects and not to describe a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Referring to fig. 1 to 5, fig. 1 is a schematic structural diagram of an embodiment of a filter of the present application; FIG. 2 is a schematic of the topology of the filter of the present application; FIG. 3 is a schematic structural diagram of the combined structure of the filter cavity, the tuning rod and the resonant rod of FIG. 1; FIG. 4 is a schematic diagram of an equivalent circuit structure of the filter of the present application; fig. 5 is a schematic diagram of a simulation structure of the filter of the present application.

The filter 10 of the present embodiment includes: a housing 11 and a filter branch 12. The filtering branch 12 is disposed on the housing 11, and is composed of eleven filtering cavities 121 coupled in sequence, a first filtering cavity a1, a second filtering cavity a2, a third filtering cavity A3, a fourth filtering cavity a4, a fifth filtering cavity a5, a sixth filtering cavity a6, a seventh filtering cavity a7, an eighth filtering cavity A8, a ninth filtering cavity a9, a tenth filtering cavity a10 and an eleventh filtering cavity a 11. The first filter cavity a1 and the third filter cavity A3 of the filter branch 12 are inductively cross-coupled to form an inductive cross-coupling zero point of the filter branch 12; the fourth filtering cavity a4 and the sixth filtering cavity a6 of the filtering branch 12, the seventh filtering cavity a7 and the ninth filtering cavity a9 of the filtering branch 12, and the seventh filtering cavity a7 and the tenth filtering cavity a10 of the filtering branch 12 are respectively capacitively cross-coupled to form three capacitive cross-coupling zeros of the filtering branch 12. The bandwidth range of the filtering branch 12 is 2515MHz-2675 MHz.

Different from the prior art, the filter 10 of the embodiment can realize filtering with bandwidth of 2515MHz-2675 MHz; the filtering branch 12 of the filter 10 of this embodiment forms an inductive coupling zero and three capacitive cross-coupling zeros, which can achieve a strong suppression effect on the bandwidth of the filter 10, and therefore, can improve the stop-band suppression performance of the filter 10.

As shown in fig. 1, the housing 11 has a first direction i and a second direction ii perpendicular to each other, and the eleven filter cavities 121 of the filter branch 12 are divided into four rows arranged along the first direction i.

The second filtering cavity a2, the sixth filtering cavity a6 and the tenth filtering cavity a10 of the filtering branch 12 are in a row and are sequentially arranged along the second direction ii; the first filtering cavity A1, the fourth filtering cavity A4, the seventh filtering cavity A7 and the eleventh filtering cavity A11 of the filtering branch 12 are in a row and are sequentially arranged along the second direction II; the third filtering cavity A3, the fifth filtering cavity a5 and the ninth filtering cavity a9 of the filtering branch 12 are in a row and are sequentially arranged along the second direction ii; the eighth filter cavities A8 of the filter branch 12 are in one row.

The second filter cavity a2 of the filter branch 12 is away from the midline of the housing 10 in the second direction ii relative to the first filter cavity a1 of the filter branch 12, and an included angle between a connecting line of the center of the first filter cavity a1 and the center of the second filter cavity a2 and the midline is an acute angle; the fourth filtering cavity a4 of the filtering branch 12 is close to the middle dividing line of the housing 10 in the second direction ii relative to the third filtering cavity A3 of the filtering branch 12, and an included angle between a connecting line of the center of the fourth filtering cavity a4 and the center of the third filtering cavity A3 and the middle dividing line is an acute angle; the ninth filter cavity a9 of the filter branch 12 is close to the midline of the housing 10 in the second direction ii relative to the eighth filter cavity A8 of the filter branch 12, and an included angle between a connecting line of the center of the ninth filter cavity a9 and the center of the eighth filter cavity A8 and the midline is an acute angle.

Wherein, the projection of the center of the third filter cavity A3 of the filter branch 12 in the second direction ii coincides with the projection of the center of the second filter cavity a2 of the filter branch 12 in the second direction ii; the projection of the center of the fifth filter cavity a5 of the filter branch 12 in the second direction ii coincides with the projection of the center of the sixth filter cavity a6 of the filter branch 12 in the second direction ii; the projection of the center of the eighth filter cavity A8 of the filter branch 12 in the second direction ii coincides with the projection of the center of the seventh filter cavity a7 of the filter branch 12 in the second direction ii; the projection of the center of the ninth filter cavity a9 of the filter branch 12 in the second direction ii coincides with the projection of the center of the tenth filter cavity a10 of the filter branch 12 in the second direction ii.

Optionally, the eleven filter cavities 121 of the filter branch 12 are identical in size and shape.

As can be seen from fig. 1, the eleven filter cavities 121 of the filter branch 12 are divided into four rows regularly arranged along the first direction i, and the projections of the third filter cavity A3 and the second filter cavity a2, the fifth filter cavity a5 and the sixth filter cavity a6, the eighth filter cavity A8 and the seventh filter cavity a7, and the ninth filter cavity a9 and the tenth filter cavity a10 are overlapped, so that the rows of cavities of the filter 10 are regularly compact, and the processing and the volume reduction are facilitated.

As shown in fig. 1 and 3, the eleven filter cavities 121 of the filter branch 12 are each provided with a resonance rod 13 and a tuning rod 14. The resonant rod 13 includes a U-shaped sidewall 131 and a hollow cavity 132 formed by the U-shaped sidewall 131, and one end of the tuning rod 14 is disposed in the hollow cavity 132. The filter 10 of the present embodiment can adjust the resonant frequency of the filter cavity 121 by adjusting the depth of the tuning rod 14 within the hollow internal cavity 132.

Optionally, the resonant rod 13, the hollow cavity 132 and the tuning rod 14 are coaxially arranged. Alternatively, the eleven filter cavities 121 of the filter branch 12 may be metal filter cavities, and the resonant rod 13 may be a metal resonant rod. Wherein the metal material may be iron. The resonant rod 13 made of the ferrous material is used in the embodiment, so that the production cost can be effectively reduced.

Optionally, the material of the resonant rod 13 of the present embodiment may be a screw of 1215MS, M8, or M4.

As shown in fig. 3, the housing 11 is further provided with a mounting seat 15, and the U-shaped sidewall 131 is fixed on the mounting seat 15 and fixed on the housing 11 through the mounting seat 15.

Further, a mounting hole (not shown) may be provided on the bottom of the U-shaped sidewall 131, one end of the mounting seat 15 is fixed to the housing 11, and the other end of the mounting seat 15 is mounted in the mounting hole to fix the resonant rod 13 to the mounting seat 15. Optionally, the mounting hole may be a through hole, a blind hole, a threaded hole, or the like, the mounting seat 15 may be a stud, and the mounting seat 15 is configured to match with the mounting hole.

Further, the filter 10 further includes a cover plate (not shown) covering the eleven filter cavities 121 of the filter branch 12, and the other end of the tuning rod 14 penetrates the cover plate. Alternatively, the tuning rod 14 may be a metal screw, and a screw hole is provided on the cover plate, so that the tuning rod 14 is inserted into the cover plate.

The coupling zero is also referred to as a transmission zero. The transmission zero is the transmission function of the filter is equal to zero, namely, the electromagnetic energy cannot pass through the network on the frequency point corresponding to the transmission zero, so that the full isolation effect is achieved, the suppression effect on signals outside the passband is achieved, and the high isolation among the multiple passbands can be better achieved.

As shown in fig. 1 and fig. 2, a first window (not shown) is disposed between the first filter cavity a1 and the third filter cavity A3 of the filtering branch 12 of this embodiment, and the first window is used to implement inductive cross coupling, which is equivalent to an inductor L disposed between the first filter cavity a1 and the third filter cavity A3. And a metal coupling rib 16 is arranged between the first filter cavity a1 and the third filter cavity A3, and the inductive cross coupling between the first filter cavity a1 and the third filter cavity A3 is further enhanced by the metal coupling rib 16. The first filter cavity a1 and the third filter cavity A3 are inductively cross-coupled, so that the filter branch 12 generates a transmission zero at the high end of the pass band, i.e. an inductive cross-coupling zero.

The flying rods 17 are respectively arranged between the fourth filtering cavity a4 and the sixth filtering cavity A6, between the seventh filtering cavity a7 and the ninth filtering cavity a9, and between the seventh filtering cavity a7 and the tenth filtering cavity a10 of the filtering branch 12 in this embodiment, and capacitive cross coupling is realized by the flying rods 17, which is equivalent to that a first capacitor C1, a second capacitor C2 and a third capacitor C3 are respectively arranged between the fourth filtering cavity a4 and the sixth filtering cavity A6, between the seventh filtering cavity a7 and the ninth filtering cavity a9, and between the seventh filtering cavity a7 and the tenth filtering cavity a 10. Capacitive cross coupling is adopted between the fourth filter cavity A4 and the sixth filter cavity A6, so that the filter branch 12 generates a transmission zero point at the low end of the passband, namely a capacitive cross coupling zero point; capacitive cross coupling is adopted between the seventh filter cavity A7 and the tenth filter cavity A10, so that the filter branch 12 generates a transmission zero point, namely two capacitive cross coupling zero points, at the high end and the low end of the passband respectively; capacitive cross coupling is adopted between the seventh filter cavity A7 and the ninth filter cavity A9, and is used for assisting in adjusting the strength of two capacitive cross coupling zeros generated by the seventh filter cavity A7 and the tenth filter cavity A10.

Eleven filter cavities 121 of the filter branch 12 of this embodiment are sequentially and adjacently arranged along the main coupling path, a second window (not shown) is disposed between any group of adjacent filter cavities 121, and electromagnetic energy is transmitted between two adjacent filter cavities 121 on the main coupling path through the second window. For example, second windows are respectively disposed between the first filter cavity a1 and the second filter cavity a2, between the second filter cavity a2 and the third filter cavity A3, between the third filter cavity A3 and the fourth filter cavity a4, between the fourth filter cavity a4 and the fifth filter cavity A5, between the fifth filter cavity A5 and the sixth filter cavity A6, between the sixth filter cavity A6 and the seventh filter cavity a7, between the seventh filter cavity a7 and the eighth filter cavity A8, between the eighth filter cavity A8 and the ninth filter cavity a9, between the ninth filter cavity a9 and the tenth filter cavity a10, and between the tenth filter cavity a10 and the eleventh filter cavity a 11.

Second windows between the second filter cavity a2 and the third filter cavity A3, between the third filter cavity A3 and the fourth filter cavity a4, between the fourth filter cavity a4 and the fifth filter cavity a5, and between the eighth filter cavity A8 and the ninth filter cavity a9 are further provided with metal coupling ribs 16 for improving the coupling strength between two adjacent filter cavities 121 on the main coupling path.

Further, the filter 10 of the present embodiment further includes: an input port (not shown) connected to the first filter chamber a1 of the filter 10 and an output port (not shown) connected to the eleventh filter chamber a11 of the filter 10.

The input port and the output port are taps, the input port is connected with the resonance rod 13 in the first filter cavity A1, and electromagnetic signals are input into the first filter cavity A1; the output port is connected to the resonant rod 13 in the eleventh filter chamber a11, and outputs the electromagnetic signal of the eleventh filter chamber a 11.

As shown in fig. 4, an equivalent circuit of the filter 10 of this embodiment has an impedance Z1 at an input port, and an impedance Z2 at an output port; in order to ensure that electromagnetic signals are transmitted between the eleven filter cavities 121 of the filter 10, impedance adjusters ZV need to be respectively arranged between the input port and the first filter cavity a1, between adjacent filter cavities 121 on the main coupling path, between non-cascaded filter cavities 121 forming cross coupling, and between the eleventh filter cavity a11 and the output port, so as to realize impedance matching.

The simulation result of the filter 10 of the present embodiment is shown in fig. 5, and it can be known from fig. 5 that the bandwidth of the filter 10 of the present embodiment is about 2515MHz-2675 MHz; as shown in the frequency band curve S1, there are two low-end coupling zeros a, b and two high-end coupling zeros c, d. The rejection at the point a exceeds 80dB, the rejection at the point b exceeds 60dB, the rejection at the point c exceeds 60dB, and the rejection at the point d exceeds 80dB, that is, the rejection of the low end outside the pass band of the filter 10 is greater than 60dB, the rejection of the high end outside the pass band is greater than 60dB, and the in-band loss of the filter 10 is less than 1dB, so that the filter 10 has the characteristics of strong interference rejection capability and small in-band loss.

Therefore, the filter 10 of the present embodiment is an 11-order filter 10 applied to a 5G mobile communication system, and has a working frequency band of 2515MHz-2675MHz, and has the characteristics of small in-band loss, strong anti-interference capability, small overall size, and light weight.

The filter 10 in the embodiment of the application has low loss, and can ensure low energy consumption of the communication module. The filter 10 is designed by combining the 11-order filter cavities 121, and a coupling zero structure is introduced, so that the filter has strong anti-interference capability, and a communication system can be prevented from being interfered by stray signals. The filter 10 has a simple design, low cost, and good structural and electrical performance stability.

Referring to fig. 6, fig. 6 is a schematic structural diagram of an embodiment of a communication device according to the present application. The communication device 20 of the present embodiment includes an antenna 22 and a radio frequency unit 21 connected to the antenna 22, the radio frequency unit 21 includes a filter 10 as shown in the above-mentioned embodiment, and the filter 10 is used for filtering radio frequency signals. In other embodiments, the rf Unit 21 may be integrated with the Antenna 22 to form an Active Antenna Unit (AAU).

Optionally, the communication device 20 is one of a simplex, a duplexer, a splitter, a combiner, and a tower top amplifier.

The above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of the present application.