阅读说明：本技术 一种新型波导带通滤波器 (Novel waveguide band-pass filter ) 是由 王耀光 唐挺 王曙光 于 2021-03-01 设计创作，主要内容包括：本发明提供一种新型波导带通滤波器,包括上腔体和下腔体,上腔体与下腔体配合安装后形成滤波器本体,滤波器本体两端均设置有内腔,两端的内腔之间的空腔为谐振腔,两端的内腔均与谐振腔连接,谐振腔内设置有若干耦合窗,若干耦合窗相互间隔设置且留有间距,相邻的耦合窗之间的间距部分设置有电容加载脊,位于谐振腔两端的两个耦合窗分别与两端的内腔连通。本发明解决了目前由于高次寄生谐振模式的存在,使得标准形式的波导带通滤波器的第二通带跟主模工作通带很近,位于主模通带频率的1.5倍频率左右,这也导致标准波导带通滤波器的高端阻带性能较差,低于通带低频端的阻带抑制,当滤波器通带带宽较宽时这种差距更加明显的问题。(The invention provides a novel waveguide band-pass filter, which comprises an upper cavity and a lower cavity, wherein the upper cavity and the lower cavity are matched and installed to form a filter body, inner cavities are arranged at two ends of the filter body, a cavity between the inner cavities at the two ends is a resonant cavity, the inner cavities at the two ends are connected with the resonant cavity, a plurality of coupling windows are arranged in the resonant cavity, the coupling windows are arranged at intervals, intervals are reserved between the coupling windows, a capacitor loading ridge is arranged at the interval part between the adjacent coupling windows, and the two coupling windows at the two ends of the resonant cavity are respectively communicated with the inner cavities at the two ends. The invention solves the problems that the second passband of the standard waveguide band-pass filter is very close to the working passband of the main mode and is positioned at about 1.5 times of the frequency of the main mode passband due to the existence of a high-order parasitic resonance mode at present, which also causes the high-end stop band performance of the standard waveguide band-pass filter to be poorer than the stop band rejection at the low-frequency end of the passband, and the difference is more obvious when the passband bandwidth of the filter is wider.)

1. The utility model provides a novel waveguide band pass filter, a serial communication port, including last cavity and lower cavity, go up the cavity and form the filter body with cavity cooperation installation back down, the filter body both ends all are provided with the inner chamber, the cavity between the inner chamber at both ends is the resonant cavity, the inner chamber at both ends all is connected with the resonant cavity, be provided with a plurality of coupling windows in the resonant cavity, a plurality of coupling windows are separated each other and are set up and leave the interval, interval part between the adjacent coupling window is provided with electric capacity loading spine, a plurality of coupling windows use electric capacity loading spine to separate each other the setting as the interval promptly, two coupling windows that are located the resonant cavity both ends communicate with the inner chamber at both ends respectively.

2. A novel waveguide bandpass filter as claimed in claim 1 wherein the capacitively loaded ridges are disposed laterally within the resonator.

3. A novel waveguide bandpass filter as claimed in claim 1 wherein the filter body is flanged on the outward side of the cavity.

4. A novel waveguide bandpass filter as claimed in claim 1 wherein the filter body is provided with solder slots on the outward side of the resonator.

5. A novel waveguide bandpass filter as claimed in claim 4 wherein the solder slots are distributed along the edges of the resonator.

6. The novel waveguide bandpass filter of claim 1 wherein the surface of the filter body is coated with nickel and silver plated layers.

7. The novel waveguide bandpass filter of claim 6 wherein the surface of the nickel and silver plated layer is coated with a brownish green paint.

8. A novel waveguide bandpass filter as claimed in claim 1 wherein the outer edge of the filter body is chamfered.

Technical Field

The invention relates to the field of filters, in particular to a novel waveguide band-pass filter.

Background

A filter is a frequency-selective device that passes certain frequency components of a signal while significantly attenuating other frequency components. By using the frequency selection function of the filter, interference noise can be filtered out or spectrum analysis can be carried out. In other words, any device or system that can pass a specific frequency component of a signal and greatly attenuate or suppress other frequency components is called a filter. The filter is a device for filtering waves. "wave" is a very broad physical concept, and in the field of electronics, is narrowly limited to refer specifically to processes that describe the variation of values of various physical quantities over time. This process is converted into a time function of voltage or current, called time waveform of various physical quantities, or called signal, by the action of various sensors. Since the argument time is continuously valued, it is called a continuous time signal, which is also conventionally called an analog signal.

The conventional waveguide band-pass filter consists of a resonant cavity and a coupling window, wherein the waveguide mode of the waveguide resonant cavity is TE10 mode; meanwhile, the resonant cavity can also have a plurality of other high-order resonant modes, wherein the lowest resonant frequency is closest to the frequency of the main mode (TE10 mode), and the highest-order parasitic resonant modes such as TE01, TE20 and the like exist, and the lowest frequency of the high-order parasitic resonant modes is only close to 1.5-2 times of the frequency of the main mode. Due to the existence of the high-order parasitic resonance modes, the second passband of the standard waveguide bandpass filter is very close to the main mode working passband and is positioned at about 1.5 times of the frequency of the main mode passband, so that the high-end stopband performance of the standard waveguide bandpass filter is poor and is lower than the stopband rejection at the low-frequency end of the passband, and the difference is more obvious when the passband bandwidth of the filter is wider.

Disclosure of Invention

The invention provides a novel waveguide band-pass filter, which aims to solve the problems that the second passband of the standard waveguide band-pass filter is very close to the working passband of a main mode and is positioned at about 1.5 times of the passband frequency of the main mode due to the existence of a high-order parasitic resonance mode at present, so that the high-end stop band performance of the standard waveguide band-pass filter is poor and is lower than the stop band rejection at the low-frequency end of the passband, and the difference is more obvious when the passband bandwidth of the filter is wider.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

the utility model provides a novel waveguide band pass filter, including last cavity and lower cavity, go up the cavity and form the filter body with cavity cooperation installation back down, the filter body both ends all are provided with the inner chamber, the cavity between the inner chamber at both ends is the resonant cavity, the inner chamber at both ends all is connected with the resonant cavity, be provided with a plurality of coupling windows in the resonant cavity, a plurality of coupling windows are separated each other and are set up and leave the interval, interval part between the adjacent coupling window is provided with electric capacity loading spine, a plurality of coupling windows use electric capacity loading spine to separate each other the setting as the interval promptly, two coupling windows that are located the resonant cavity both ends communicate with the inner chamber at both ends respectively.

Further, the capacitive loading ridges are arranged laterally within the resonant cavity.

Further, the filter body is provided with a flange at the outward side of the inner cavity.

Furthermore, the filter body is provided with a soldering tin groove at one side of the resonant cavity facing outwards.

Further, the solder slots are distributed along the edges of the cavity.

Furthermore, the surface of the filter body is provided with a nickel-plated silver layer.

Further, the surface of the nickel-plated silver layer is coated with brown-green paint.

Further, the outer edge of the filter body is provided with a chamfer.

Compared with the prior art, the invention has the following beneficial effects: compared with a standard waveguide resonant cavity, the waveguide band-pass filter has the advantages that the transverse capacitance loading ridge is added in the waveguide resonant cavity, so that the second, third and higher order intrinsic resonant frequencies of the resonant cavity can be effectively improved on the premise that the fundamental mode resonant frequency is not changed, the parasitic pass band of the waveguide band-pass filter is objectively pushed to a higher frequency section, and the high-frequency end stop band suppression performance of the waveguide band-pass filter is effectively improved. By reasonably designing the size of the transverse capacitor loading ridge, the characteristics of the standard waveguide band-pass filter with out-of-band rejection low-end high and high-end difference can be artificially changed, even the state of high-end rejection high and low-end rejection is achieved, and the frequency selection response range of the waveguide band-pass filter is greatly improved. In addition, compared with the waveguide filter with the same frequency, the length of the waveguide filter can be effectively shortened due to the existence of the capacitive loading ridge, and generally, the length of the waveguide filter adopting the capacitive loading ridge can reach 70% -60% of the length of a standard waveguide filter without the capacitive loading ridge, so that the size of the waveguide filter is effectively reduced, and the weight of a device is reduced.

Drawings

Fig. 1 is a schematic diagram of the external structure of a novel waveguide bandpass filter according to the present invention.

Fig. 2 is a schematic diagram of the internal structure of a novel waveguide bandpass filter according to the present invention.

Reference numerals: the filter comprises a filter body 1, an upper cavity 2, a lower cavity 3, an inner cavity 4, a resonant cavity 5, a coupling window 6, a capacitor loading ridge 7, a flange 8 and a soldering tin groove 9.

Detailed Description

The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

The present invention will be further described with reference to the following examples, which are intended to illustrate only some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, other embodiments used by those skilled in the art without any creative effort belong to the protection scope of the present invention.

Referring to fig. 1-2, an alternative embodiment of the present invention is shown for illustrative purposes only and is not limited thereto.

Example one

As shown in fig. 1 and 2, a novel waveguide band-pass filter, including last cavity 2 and lower cavity 3, go up cavity 2 and form filter body 1 after the cavity 3 cooperation installation down, filter body 1 both ends all are provided with inner chamber 4, the cavity between the inner chamber 4 at both ends is resonant cavity 5, the inner chamber 4 at both ends all is connected with resonant cavity 5, be provided with a plurality of coupling windows 6 in the resonant cavity 5, a plurality of coupling windows 6 set up and leave the interval each other at interval, interval part between the adjacent coupling window 6 is provided with electric capacity loading spine 7, i.e. a plurality of coupling windows 6 use electric capacity loading spine 7 to set up as the interval each other, two coupling windows 6 that are located resonant cavity 5 both ends communicate with the inner chamber 4 at both ends respectively.

The capacitive loading ridge 7 is arranged laterally within the resonant cavity 5. The filter body 1 is provided with a flange 8 on the outward side of the cavity 4. The filter body 1 is provided with a soldering tin groove 9 at one side of the resonant cavity 5 which faces outwards. The solder slots 9 are distributed along the edge of the cavity 5. The upper cavity 2 and the lower cavity 3 are connected by soldering through a soldering tin groove 9.

The surface of the filter body 1 is provided with a nickel-plated silver layer. The surface of the nickel and silver plating layer is coated with brown green paint. The outer edge of the filter body 1 is provided with a chamfer.

Example two

The second embodiment is a further optimization of the first embodiment.

The capacitive loading ridges 7 are provided with rounded corners with an R of 0.3 mm.

The width of the solder container 9 is 1.2mm and the depth thereof is 1 mm.

The working principle is as follows:

the conventional waveguide band-pass filter comprises a resonant cavity 5 and a coupling window 6, wherein the waveguide mode of the waveguide resonant cavity is TE10 mode, and meanwhile, the resonant cavity 5 can simultaneously have a plurality of other high-order resonant modes, wherein the lowest resonant frequency, the highest-order parasitic resonant modes such as TE01 and TE20 which are closest to the frequency of a main mode (TE10 mode), and the lowest frequency of the high-order parasitic resonant modes is only 1.5-2 times of the frequency of the main mode. Due to the existence of the high-order parasitic resonance modes, the second passband of the standard waveguide bandpass filter is very close to the main mode working passband and is positioned at about 1.5 times of the frequency of the main mode passband, so that the high-end stopband performance of the standard waveguide bandpass filter is poor and is lower than the stopband rejection at the low-frequency end of the passband, and the difference is more obvious when the passband bandwidth of the filter is wider. The capacitor loading ridge 7 of the patent is used for improving and correcting the inherent characteristic of poor stop band rejection of the high-frequency end of the waveguide low-pass filter.

Compared with a standard waveguide resonant cavity, on the premise that the fundamental mode resonant frequency is not changed, the second, third and higher order fundamental resonant frequencies of the resonant cavity 5 can be effectively improved, the parasitic pass band of the waveguide band-pass filter is objectively pushed to a higher frequency section, and the high-frequency end stop band rejection performance of the waveguide band-pass filter is effectively improved. By reasonably designing the size of the transverse capacitor loading ridge 7, the characteristics of the standard waveguide band-pass filter with out-of-band rejection low-end high and high-end difference can be artificially changed, even the state of high-end rejection high and low-end rejection is achieved, and the frequency selection response range of the waveguide band-pass filter is greatly improved. In addition, compared with the waveguide filter with the same frequency, the length of the waveguide filter can be effectively shortened due to the existence of the capacitive loading ridge 7, and generally, the length of the waveguide filter adopting the capacitive loading ridge 7 can reach 60% -70% of the length of a standard waveguide filter without the capacitive loading ridge 7, so that the size of the waveguide filter is effectively reduced, and the weight of a device is reduced.

The above-described embodiments are intended to be illustrative, not limiting, of the invention, and therefore, variations of the example values or substitutions of equivalent elements are intended to be within the scope of the invention.

From the above detailed description, it will be apparent to those skilled in the art that the foregoing objects and advantages of the invention are achieved and are in accordance with the provisions of the patent statutes.