阅读说明：本技术 一种双频段多模组合馈源喇叭 (Dual-band multi-mode combined feed source loudspeaker ) 是由 张地 吴广志 苏永和 王新荣 王潇 寇明鑫 刘洋 谭炳毓 王伟 陶敏 于 2020-11-13 设计创作，主要内容包括：本发明涉及一种双频段多模组合馈源喇叭,属于微波技术领域。包括支座,所述支座与外结构固定连接,所述支座上设有C频段馈源和S频段馈源组,所述C频段馈源设于支座中心,所述S频段馈源组设于C频段馈源外侧；所述S频段馈源组包括多个S频段馈源,多个所述S频段馈源沿支座中心环向均匀间隔分布,任一所述S频段馈源后端对接波导变换器。所述C频段馈源采用环加载波纹喇叭；所述环加载波纹喇叭包括光壁区、环加载区、波纹区和张角区,所述光壁区与波纹区之间通过环加载区过渡连接,所述张角区对接波纹区。本申请适用于C频段和S频段,设计合适的C频段馈源结构和口径,从而兼顾两个频段的性能。(The invention relates to a dual-band multi-mode combined feed source loudspeaker, and belongs to the technical field of microwaves. The device comprises a support, wherein the support is fixedly connected with an outer structure, a C-frequency band feed source and an S-frequency band feed source group are arranged on the support, the C-frequency band feed source is arranged in the center of the support, and the S-frequency band feed source group is arranged outside the C-frequency band feed source; the S-band feed source group comprises a plurality of S-band feed sources, the S-band feed sources are uniformly distributed along the central ring direction of the support at intervals, and the rear end of any one S-band feed source is connected with the waveguide converter. The C frequency band feed source adopts a ring loading corrugated horn; the ring-loading corrugated horn comprises a light wall area, a ring loading area, a corrugated area and an opening angle area, wherein the light wall area is in transitional connection with the corrugated area through the ring loading area, and the opening angle area is in butt joint with the corrugated area. This application is applicable to C frequency channel and S frequency channel, designs suitable C frequency channel feed structure and bore to compromise the performance of two frequency channels.)

1. A kind of dual-band multimode makes up the feed horn, characterized by that: the device comprises a support, wherein the support is fixedly connected with an outer structure, a C-frequency band feed source and an S-frequency band feed source group are arranged on the support, the C-frequency band feed source is arranged in the center of the support, and the S-frequency band feed source group is arranged outside the C-frequency band feed source;

the S-band feed source group comprises a plurality of S-band feed sources, the S-band feed sources are uniformly distributed along the central ring direction of the support at intervals, and the rear end of any one S-band feed source is connected with the waveguide converter.

2. The dual-band multi-mode combined feed horn of claim 1, wherein: the C frequency band feed source adopts a ring loading corrugated horn; the ring-loading corrugated horn comprises a light wall area, a ring loading area, a corrugated area and an opening angle area, wherein the light wall area is in transitional connection with the corrugated area through the ring loading area, and the opening angle area is in butt joint with the corrugated area.

3. The dual-band multi-mode combined feed horn of claim 2, wherein: the cross sections of the ring loading area and the corrugated area are respectively trapezoidal, a plurality of first circumferential grooves are formed in the inner wall of the ring loading area, the first circumferential grooves are vertically and evenly arranged at intervals, rings are respectively arranged in the first circumferential grooves, a plurality of second circumferential grooves are formed in the inner wall of the corrugated area, and the second circumferential grooves are vertically and evenly arranged at intervals.

4. The dual-band multi-mode combined feed horn of claim 3, wherein: the width of each ring is gradually reduced from bottom to top.

5. The dual-band multi-mode combined feed horn of claim 2, wherein: the inner caliber of the ring loading corrugated horn is 265-275 mm, the half opening angle of the ring loading corrugated horn is 12-18 degrees, and the phase center of the ring loading corrugated horn is 190-210 mm away from the caliber surface of the horn.

6. The dual-band multi-mode combined feed horn of claim 1, wherein: the S-band feed source adopts a conical horn, the caliber of the conical horn is 115-125 mm, and the center of each conical horn is arranged on any circumference with the diameter of 410-425 mm.

7. The dual-band multi-mode combined feed horn of claim 1, wherein: each waveguide converter is a gradually-changed structural part which comprises a rectangular waveguide and a circular waveguide, and the rectangular waveguide and the circular waveguide are gradually transited and butted.

Technical Field

The invention relates to a dual-band multi-mode combined feed source loudspeaker, and belongs to the technical field of microwaves.

Background

Due to the development requirements of the fields of military affairs, civil life, medical treatment and the like, the satellite communication technology is rapidly developed. For detecting remote targets, the reflector antenna has the characteristic of high efficiency and is a preferred system annual form of domestic and foreign communication stations. For any type of reflector antenna, if there is no high-efficiency horn as the primary radiator (feed for short), the high-efficiency reflector will be a null one, and the feed has a great influence on the antenna performance. The feed source is used for processing the electromagnetic wave from the reflection surface, and the electromagnetic wave is changed into a signal form which can be processed at the rear end by extracting a useful mode, integrating a polarization mode, impedance conversion and the like; the radio frequency power sent to the rear end is radiated to the reflecting surface in an electromagnetic wave mode with high efficiency, so that the reflecting surface generates proper field distribution. In practical application, the feed source is generally a single-frequency-band single-form horn antenna, so that the antenna efficiency is low. According to project requirements, a combined feed source suitable for the C frequency band and the S frequency band is designed, and mutual performance must be considered.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a dual-band multi-mode combined feed source loudspeaker aiming at the prior art, which is suitable for a C frequency band and an S frequency band, gives consideration to the performances of the two, and improves the working efficiency.

The technical scheme adopted by the invention for solving the problems is as follows: a dual-band multimode combined feed source horn comprises a support, wherein the support is fixedly connected with an external structure, a C-band feed source and an S-band feed source group are arranged on the support, the C-band feed source is arranged in the center of the support, and the S-band feed source group is arranged outside the C-band feed source;

the S-band feed source group comprises a plurality of S-band feed sources, the S-band feed sources are uniformly distributed along the central ring direction of the support at intervals, and the rear end of any one S-band feed source is connected with the waveguide converter.

The C frequency band feed source adopts a ring loading corrugated horn; the ring-loading corrugated horn comprises a light wall area, a ring loading area, a corrugated area and an opening angle area, wherein the light wall area is in transitional connection with the corrugated area through the ring loading area, and the opening angle area is in butt joint with the corrugated area.

The cross sections of the ring loading area and the corrugated area are respectively trapezoidal, a plurality of first circumferential grooves are formed in the inner wall of the ring loading area, the first circumferential grooves are vertically and evenly arranged at intervals, rings are respectively arranged in the first circumferential grooves, a plurality of second circumferential grooves are formed in the inner wall of the corrugated area, and the second circumferential grooves are vertically and evenly arranged at intervals.

The width of each ring is gradually reduced from bottom to top.

The inner caliber of the ring loading corrugated horn is 265-275 mm, the half opening angle of the ring loading corrugated horn is 12-18 degrees, and the phase center of the ring loading corrugated horn is 190-210 mm away from the caliber surface of the horn.

The S-band feed source adopts a conical horn, the caliber of the conical horn is 115-125 mm, and the center of each conical horn is arranged on any circumference with the diameter of 410-425 mm.

Each waveguide converter is a gradually-changed structural part which comprises a rectangular waveguide and a circular waveguide, and the rectangular waveguide and the circular waveguide are gradually transited and butted.

Compared with the prior art, the invention has the advantages that: a dual-band multi-mode combined feed source horn is suitable for C frequency band and S frequency band. This application sets up the S frequency channel feed all around at the C frequency channel feed all around to the hoop, under the dual conditional constraint of circumference diameter and C frequency channel feed bore (including the structural requirement) that the S frequency channel feed was located, designs suitable C frequency channel feed structure and bore to compromise the performance of two frequency channels, not only guaranteed the work efficiency high gain of antenna at the C frequency channel, guaranteed sheltering from of loudspeaker as little as possible after having increased the S frequency channel feed moreover.

Drawings

Fig. 1 is a three-dimensional schematic view of a dual-band multi-mode combined feed source horn according to an embodiment of the present invention;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a cross-sectional view of the C-band feed of FIG. 1;

FIG. 4 is a receiving directional diagram of a C-band feed source with a frequency of 3.6 GHz;

FIG. 5 is a receiving directional diagram of a C-band feed source with a frequency of 4.2 GHz;

FIG. 6 is a transmission directional diagram of a C-band feed source with a frequency of 5.6 GHz;

FIG. 7 is a transmission directional diagram of a C-band feed source with a frequency of 6.5 GHz;

fig. 8 and 9 are standing wave diagrams of receiving and transmitting frequency bands of the C-band loudspeaker;

FIG. 10 is an array pattern diagram of the S-band feed source of FIG. 1 with a frequency of 2.2 GHz;

FIG. 11 is an array pattern diagram of the S-band feed source of FIG. 1 with a frequency of 2.4 GHz;

FIG. 12 is a graph of antenna pattern characteristics versus cell spacing for an S-band feed group;

FIG. 13 is a three-dimensional schematic diagram of the waveguide transformer of FIG. 1;

in the figure, a 1C frequency band feed source, a 1.1 optical wall region, a 1.2 ring loading region, a 1.3 corrugated region, a 1.4 flare angle region, a 2S frequency band feed source, a 3 support, a 4 waveguide converter, a 4.1 rectangular waveguide and a 4.2 circular waveguide are adopted.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

As shown in fig. 1 and 2, the dual-band multimode combined feed horn in the embodiment includes a support 3, a C-band feed 1 and 8S-band feeds 2 are arranged on the support 3, the C-band feed 1 is arranged at the center of the support 3, the 8S-band feeds 2 are circumferentially and uniformly distributed around the C-band feed 1 at intervals, and the rear ends of the S-band feeds 2 are respectively butted with a waveguide converter 4. The support 3 is also fixedly connected with the outer structure. The coplanar design of the C frequency band feed source 1 and the S frequency band feed source 2 is realized, the 2 frequency bands form antenna aperture distribution fields with high gain, low sidelobe and other index requirements, and effective radiation/reception of signals is realized.

FIG. 3 shows that the transmission frequency of the C-band feed source 1 is 5.8-6.5 GHz; the receiving frequency is 3.6-4.2 GHz, and the C frequency band feed source 1 is designed to be coplanar with the S frequency band feed source and needs to be as small as possible on the premise of ensuring indexes, so that the C frequency band feed source is a ring-loaded corrugated horn. The ring-loaded corrugated horn comprises an optical wall area 1.1, a ring loading area 1.2, a corrugated area 1.3 and an opening angle area 1.4, wherein the optical wall area 1.1 is in transitional connection with the corrugated area 1.3 through the ring loading area 1.2, the opening angle area 1.4 is in butt joint with the corrugated area 1.3, a higher-order mode is excited and controlled through an internal step or an opening angle, because a main mode enters the corrugated area from the optical wall area, the higher-order mode can be excited, the required higher-order mode can be obtained by controlling the size of the corrugated ring, the ring loading area 1.2 is designed to complete mode selection for preventing the radiation performance of the higher-order mode from being poor, and the opening angle area 1.4 assists in controlling the higher-order mode. The radius d1 of the light wall region 1.1 is 43.4mm, the length b2 is 50mm, and the standing wave characteristic of a low frequency band is satisfied. The cross section of ring loading district 1.2 and ripple district 1.3 is trapezoidal respectively, and 10 first hoop grooves are seted up to the inner wall in ring loading district 1.2, and the vertical even interval in 10 first hoop grooves sets up, is equipped with the ring respectively in the first hoop groove, and the width of every ring reduces from supreme down according to 1.0 to 0.15 proportion. 20 second circumferential grooves are formed in the inner wall of the corrugated area 1.3, the groove width b1 of each second circumferential groove is 10mm, the groove depth c1 is 22mm, and the 20 second circumferential grooves are vertically and uniformly arranged at intervals. The flare 1.4 has an inner diameter of 130mm and an outer diameter of 135 mm.

The mouth dimension d2 of the ring-loaded corrugated horn was 270mm, the half opening angle α of the ring-loaded corrugated horn was 15 °, and the phase center of the ring-loaded corrugated horn was 200mm from the mouth face.

Referring to fig. 4, 5, 6 and 7, it is derived from the theoretically calculated directional diagrams that when the irradiation angle of the C-band corrugated horn to the edge of the secondary surface is 20 °, the edge irradiation level is about-10 dB, which can ensure the irradiation efficiency of the C-band.

Referring to fig. 8 and 9, the standing wave of the receiving frequency band of the C-frequency band corrugated horn is lower than-45 dB, so that the index requirement is met; standing waves of the emission frequency band of the C-band corrugated horn are lower than-37.5 dB and can work to 6.5 GHz.

Under one atmosphere, when 1W pulse power is input, the electric field distribution and the field intensity maximum value of each mode in the C-band corrugated horn are obtained. Where the TM11 mode field strength is the greatest (764V/m), giving rise to a pulse power capacity of 14.4MW under air breakdown conditions. Similarly, the field intensity of the TE11 mode of the main mode is 582V/m, and the pulse power capacity of the TE11 mode under the air breakdown condition (2.9KV/cm) is calculated to be 24.82MW, so that the C-band corrugated horn can bear 15KW of average power.

The frequency range of the S-band feed source is 2.2-2.4 GHz, the S-band feed source is a conical horn, the aperture size of the conical horn is 120mm, according to the result of simulation calculation, for the S-band feed source group, under the condition that the aperture of the S-band feed source is determined, as shown in fig. 12, when the distance between the S-band feed sources is increased, the main lobe shape of an antenna directional diagram is distorted into a saddle shape, the gain is reduced, and the beam width is increased; conversely, the main lobe gain of the antenna pattern becomes larger and the beam width becomes narrower. Constrained by the caliber, structure and thickness of the C frequency band feed source, the center of the S frequency band feed source is optimally arranged on the circumference with the diameter of 420 mm.

Referring to fig. 10 and 11, the simulated pattern 2.2GHz gain of the S-band optical wall horn array is 19.0117, and the 2.4GHz gain is 18.7508. Wherein 4 horn units form pitch and/or difference signals and the other 4 horn units form azimuth and/or difference signals. And adds the 4 horn summed signals in pitch/azimuth to form a summed signal for an array of 8 horn units.

Referring to fig. 13, the waveguide transformer is a transition structure from a rectangular waveguide to a circular waveguide, which realizes the mode conversion from a rectangular waveguide main mode TE10 to a circular waveguide TE11, and is a gradual change structure, which gradually changes a rectangle into a circle when viewed from the cross section, wherein the total length of the rectangle is 180mm, and the rectangular opening surface is 80 mm. Through this natural variation, reflection is reduced, standing waves are reduced, and good impedance matching is achieved.

The dual-band feed source comprises a C-band feed source, an S-band feed source group, a support and a waveguide converter, and the dual-band feed source is integrally combined by adopting a nested structure. The C frequency band feed source adopts a ring loading corrugated horn, and the inside of the C frequency band feed source is in a structural form combining a half-corrugated structure and a half-optical wall structure so as to reduce the aperture of the antenna. The S frequency band feed source group consists of 8S frequency band feed sources, and is uniformly distributed around the C frequency band feed sources in an array mode, so that sum/difference signals are formed. The support is not only provided with the C-frequency band feed source and the S-frequency band feed source group, but also is a structural member for fixing the support on an external structure. The waveguide converter is an S-frequency band feed source signal transmission channel, and signal quality is guaranteed. This application sets up the S frequency channel feed all around at the C frequency channel feed all around to the hoop, under the dual conditional constraint of circumference diameter and C frequency channel feed bore (including the structural requirement) that the S frequency channel feed was located, designs suitable C frequency channel feed structure and bore to compromise the performance of two frequency channels, not only guaranteed the work efficiency high gain of antenna at the C frequency channel, guaranteed sheltering from of loudspeaker as little as possible after having increased the S frequency channel feed moreover.

In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.