LU500707B1 - Ka/W-band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna - Google Patents
Ka/W-band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna Download PDFInfo
- Publication number
- LU500707B1 LU500707B1 LU500707A LU500707A LU500707B1 LU 500707 B1 LU500707 B1 LU 500707B1 LU 500707 A LU500707 A LU 500707A LU 500707 A LU500707 A LU 500707A LU 500707 B1 LU500707 B1 LU 500707B1
- Authority
- LU
- Luxembourg
- Prior art keywords
- dual
- waveguide
- isolation
- polarization
- reflector
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
- H01Q5/45—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements using two or more feeds in association with a common reflecting, diffracting or refracting device
- H01Q5/47—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements using two or more feeds in association with a common reflecting, diffracting or refracting device with a coaxial arrangement of the feeds
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/02—Waveguide horns
- H01Q13/025—Multimode horn antennas; Horns using higher mode of propagation
- H01Q13/0258—Orthomode horns
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
- H01Q19/18—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces
- H01Q19/19—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Waveguide Aerials (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
The invention provides a Ka/W band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna, which comprises a high-isolation dual-frequency dual- polarization feed source, a feed source horn, an auxiliary reflecting surface, a main- reflector and a bracket structure. The feed horn comprises a first rectangular waveguide, a rectangular circular transition structure, a second rectangular waveguide, a waveguide low-pass filter and a circular waveguide; the rectangular transition structure connects the first rectangular waveguide and the circular waveguide; the side of the first waveguide section is provided with an opening, and the waveguide low-pass filter is arranged outside the opening to connect the second rectangular waveguide and the first waveguide section. An improved dual-frequency dual-mode conical feed horn is adopted, and a feed horn is used for radiating radio frequency signals of 35GHz and 94GHz, so that the antenna radiation patterns at the two frequency points of 35GHz and 94GHz have the same pointing.
Description
DESCRIPTION Ka/W-band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna
TECHNICAL FIELD The invention relates to the field of microwave and millimeter wave radio frequency antennas, in particular to an antenna system applied to millimeter wave communication and single-frequency or dual-frequency radar.
BACKGROUND Millimeter wave refers to the electromagnetic wave in the frequency range of 30- 300GHz, which has a wide frequency coverage and is about 9 times of the microwave band width. It has the advantages of wideband, short wavelength and high resolution. It is widely used in millimeter wave relay communication, radar, remote sensing and missile guidance.
At present, millimeter-wave radars mostly use 35GHz, 94GHz, 140GHz, 220GHz as working frequency points. Due to technical factors, 35GHz is mostly used as the working frequency. Compared with 35GHz radar, 94GHz radar has higher resolution, smaller volume and stronger detection ability, which is a hot spot and trend in research and application. The 35/94GHz dual-frequency radar has great scientific research and application value in radar signal processing and analysis, 94GHz radar calibration and technology popularization.
Antenna is an important part of radar system and communication system, and its main function is to radiate the radio frequency signals of radar and communication system according to the design requirements. The 35/94GHz dual-band antenna is the key technology in the study of 35/94GHz dual-band radar.
In radar system, it is generally required that the antenna has a higher power, lower sidelobe and higher antenna gain. Traditional parabolic antenna or cassegrain antenna, as a mature antenna, has the advantages of simple structure, high efficiency, low loss, small sidelobe, high-gain and strong power resistance. So it is still widely used in millimeter wave radar and remote sensing systems.
At present, the main design method of dual-band antenna is to design multiple feeds near the focus of antenna based on traditional parabolic antenna or cassegrain antenna to realize multi-frequency. This method increases the difficulty of the antenna structure design, the blocking effect of the aperture plane, and can’t have the same radiation direction of the antenna at two or more frequencies.
The design of a 35/94GHz high-isolation dual-frequency dual-polarization cassegrain antenna with simple structure and the same radiation direction is the key technology in the development of dual-frequency radar, and has great difficulty and scientific research application value.
SUMMARY The purpose of the invention is to provide a Ka/W band dual-frequency dual- polarization high-isolation and high-gain cassegrain antenna, which adopt an improved dual-frequency dual-mode conical feed horn and use one feed horn to radiate radio frequency signals at 35GHz and 94GHz, thereby ensuring that the antenna radiation pattern at the two frequency points of the antenna have the same direction.
In order to achieve the above purpose, the present invention proposes a Ka/W band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna, which comprises a high-isolation dual-frequency dual-polarization feed source, a feed horn, a sub-reflector, a main-reflectore and a bracket structure, the main-reflector is a parabolic-surface structure, and the sub-reflector is a hyperboloid-surface structure, and its focus on the side far away from the main-reflector- reflector coincides with that of the main-reflector-reflector; the high-isolation dual- frequency dual-polarization feed and the feed horn form a feed horn system, and the radiation phase center of the feed horn is set at the focus on the side near the main- reflector-reflector of the sub-reflector, the feed horn is located in the middle of the main-reflector-reflector and passes through the main-reflector to be connected to the feed source,
the feed horn comprises a first rectangular waveguide, a rectangular circular transition structure, a second rectangular waveguide, a waveguide low-pass filter and a circular waveguide, the circular waveguide comprises a first waveguide section, a second waveguide band and a third waveguide section which are connected in sequence, wherein the first waveguide section and the third waveguide section have cylindrical structures with radii r and R respectively, and the second waveguide section has a truncated cone structure; the bottom surface at the joint between the second waveguide section and the first waveguide section 1s defined as an upper bottom surface with an upper bottom surface radius r; the bottom surface at the junction of the second waveguide section and the third waveguide section 1s defined as a lower bottom surface, and the radius of the lower bottom surface 1s R, and r 1s less than R, the rectangular circular transition structure 1s provided with a first end and a second end along the electromagnetic wave conduction direction, wherein the first end 1s rectangular and connected to the first rectangular waveguide, and the second end is circular and connected to the side of the first waveguide section far away from the second waveguide section; the shape and size of the first end portion corresponds to the first rectangular waveguide, and the shape and size of the second end portion corresponds to the cross section of the first waveguide section, the side of the first waveguide section is provided with an opening, and the waveguide low-pass filter is arranged outside the opening and is connected to the second rectangular waveguide and the first waveguide section, the support structure is arranged on the main-reflector to connects the main-reflector and the sub-reflector and fix the sub-reflector above the main-reflector.
In a further embodiment, the high-isolation dual-frequency dual-polarization feed is a 35/94GHz dual-frequency antenna with vertical polarization input.
In a further embodiment, the first rectangular waveguide is WR-10 and the second rectangular waveguide is WR-28.
In a further embodiment, the aperture of the main-reflector is 80 cm.
In a further embodiment, the radius of the first waveguide section is 3mm and the radius of the second waveguide section is 4.8 mm.
In a further embodiment, the length of the rectangular circular transition structure is 13 mm.
In a further embodiment, the length of the first waveguide section is 180 mm.
In a further embodiment, the length of the second waveguide section is 9.6 mm.
In a further embodiment, the length of the third waveguide section is 10 mm.
In a further embodiment, the Ka/W band dual-frequency dual-polarization high- isolation and high-gain cassegrain antenna adopts an embedded structure.
In a further embodiment, the Ka/W band dual-frequency dual-polarization high- isolation and high-gain cassegrain antenna adopts an embedded structure, which reduces the transmission distance of high-frequency signals in the waveguide, reduces the attenuation of radio-frequency signals, and improves the overall efficiency of the antenna.
The Ka/W band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna adopts a symmetrical structure, thereby reducing the sidelobe of the antenna, improving the aperture utilization rate of the antenna and effectively improving the cross plan of the antenna.
Compared with the prior art, the technical scheme of the invention has the obvious beneficial effects that: (1) the Ka/W band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna of the present invention realizes dual-frequency operation at 35 GHz and 94GHz at the same time.
(2) the Ka/W band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna of the present invention improves the overall gain of the antenna through a large aperture. At the same time, a feed horn is used to radiate radio frequency signals at 35 GHz and 94GHz, which ensures that the antenna radiation patterns at 35 GHz and 94GHz have the same direction.
It should be understood that all combinations of the foregoing concepts and additional concepts described in more detail below can be regarded as part of the inventive subject matter of the present disclosure as long as such concepts are not contradictory to each other. In addition, all combinations of claimed subject matter are regarded as part of the inventive subject matter of this disclosure.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Other additional aspects of the invention, such as features and/or advantages of exemplary embodiments, will be apparent from the following description, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.
BRIEF DESCRIPTION OF THE FIGURES The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in each figure may be denoted by the same reference numeral. For the sake of clarity, not every component 1s labeled in every figure. Embodiments of various aspects of the present invention will now be described by way of example with reference to the accompanying drawings, in which: Fig. 1 is a schematic structural diagram of Ka/W band dual-frequency dual- polarization high-isolation and high-gain cassegrain antenna of the present invention.
Fig. 2 is a schematic structural diagram of the feed horn of the present invention.
Fig. 3 1s a Ka band standing wave test diagram of Ka/W band dual-frequency dual- polarization high-isolation and high-gain cassegrain antenna.
Fig. 4 is a test diagram of W band standing wave of Ka/W band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna.
Fig. 5 is the Ka band isolation test diagram of Ka/W band dual-frequency dual- polarization high-isolation and high-gain cassegrain antenna.
Fig. 6 is a test chart of W band isolation of Ka/W band dual-frequency dual- polarization high-isolation and high-gain cassegrain antenna.
Fig. 7 is a 35GHz E-plane pattern test diagram of Ka/W band dual-frequency dual- polarization high-isolation and high-gain cassegrain antenna.
Fig. 8 is a 35GHz H-plane pattern test diagram of Ka/W band dual-frequency dual- polarization high-isolation and high-gain cassegrain antenna.
Fig. 9 is a 94GHz E-plane pattern test diagram of Ka/W band dual-frequency dual- polarization high-isolation and high-gain cassegrain antenna.
Fig. 10 is a 94GHz H-plane pattern test diagram of Ka/W band dual-frequency dual- polarization high-isolation and high-gain cassegrain antenna.
DESCRIPTION OF THE INVENTION In order to better understand the technical content of the present invention, specific embodiments are given and described below in conjunction with the attached drawings.
Various aspects of the invention are described in this disclosure with reference to the accompanying drawings, in which many illustrated embodiments are shown. The embodiments of the present disclosure are not necessarily defined to include all aspects of the present invention. It should be understood that the various concepts and embodiments introduced above, as well as those described in more detail below, can be implemented in any of many ways, because the disclosed concepts and embodiments of the present invention are not limited to any implementation. In addition, some aspects disclosed in the present invention can be used alone or in any suitable combination with other aspects disclosed in the present invention.
With reference to fig. 1, the present invention proposes a Ka/W band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna, which includes a high- isolation dual-frequency dual-polarization feed (rectangular structure in the lower part of fig. 1, its internal structure is the left half of fig. 2, and the right half of fig. 2 is the interior of the feed horn), a feed horn 30, an auxiliary reflecting surface 20, a main- reflector 10 and a bracket structure 40.
The mai-reflector 10 is a parabolic-surface structure, and the sub-reflector 20 is a hyperboloid-surface structure, which is located on the main-reflector 10, and its focus on the side away from the main-reflector 10 coincides with that of the main-reflector 10. The high-isolation dual-frequency dual-polarization feed and the feed horn constitute a feed horn system, and the radiation phase center of the feed horn is set at the focus on the side of the sub-reflectorr 20 near the main-reflector 10.
Preferably, the high-isolation dual-frequency dual-polarization feed is a 35/94GHz dual-frequency antenna with vertical polarization input, and the antenna cross planning is realized through vertical polarization input.
The support structure 40 is arranged on the main-reflector 10 to connect the main- reflector 10 and the sub-reflector 20 to fix the sub-reflector 20 above the main-reflector
10.
The feed horn 30 1s located in the middle of the main-reflector 10 and connected to the feed through the main-reflector 10.
Referring to fig. 2, the feed horn 30 includes a first rectangular waveguide 31, a rectangular circular transition structure 32, a second rectangular waveguide 34, a waveguide low-pass filter 35 and a circular waveguide.
Taking a 35/94GHz dual-band antenna as an example, in order to facilitate the propagation of electromagnetic waves, the first rectangular waveguide 31 is WR-10 for propagating 94GHz radio frequency signals, and the second rectangular waveguide 34 is WR-28 for propagating 35GHz radio frequency signals.
The circular waveguide comprises a first waveguide section 331, a second waveguide band and a third waveguide section 333 which are connected in sequence, wherein the first waveguide section 331 and the third waveguide section 333 have cylindrical structures with radii r and R respectively, and the second waveguide section 332 has a truncated cone structure. The bottom surface at the junction of the second waveguide section 332 and the first waveguide section 331 is defined as an upper bottom surface with a radius of r, while the bottom surface at the junction of the second waveguide section 332 and the third waveguide section 333 is defined as a lower bottom surface with a radius of R which is less than R.
For example, the radius of the first waveguide section 331 is set to 3 mm, and the radius of the second waveguide section 332 is set to 4.8 mm.
Since the cross section of the first rectangular waveguide 31 is rectangular and the cross section of the first waveguide section 331 is circular, it is necessary to provide a rectangular circular transition structure 32 to connect the first rectangular waveguide 31 and the first waveguide section 331.
The rectangular circular transition structure 32 has a first end and a second end along the electromagnetic wave conduction direction, wherein the first end is rectangular and connected to the first rectangular waveguide 31, and the second end is circular and connected to the side of the first waveguide section 331 far away from the second waveguide section 332. The shape and size of the first end portion corresponds to the first rectangular waveguide 31, and the shape and size of the second end portion corresponds to the cross section of the first waveguide section 331. The smooth transition from the first rectangular waveguide 31 to the circular waveguide is realized by the rectangular circular transition structure.
Assuming that the first rectangular waveguide 31 is WR-10, the cross-sectional dimension is 2.54*1.27mm, and the radius of the first waveguide section 331 is 3mm, it can be concluded that the cross-section of the rectangular circular transition structure 32 in the electromagnetic wave propagation direction is constantly increasing.
The side of the first waveguide section 331 is provided with an opening, and the waveguide low-pass filter 35 is arranged outside the opening and connects the second rectangular waveguide 34 with the first waveguide section 331.
Example 1.
It is assumed that the first rectangular waveguide 31 is WR-10 for propagating 94GHz radio frequency signals, and the second rectangular waveguide 34 is WR-28 for propagating 35GHz radio frequency signals. The aperture of the main-reflector 10 is 80 cm, the focal length is 240 mm, the curved surface radius of the sub-reflector 20 is 96 mm, the length of the rectangular circular transition structure 32 is 13 mm, and the length of the first waveguide section 331 is 180 mm; the length of the second waveguide section 332 is 9.6mm, and the length of the third waveguide section 333 is 10 mm.
Combined with fig. 3- fig. 10, the following conclusions can be drawn: (1) the antenna gain of Ka/W band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna of the present invention reaches 51dB at 94GHz and 43dB at 35GHz.
(2) the Ka/W band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna of the present invention has a 3dB beamwidth of 0.45 at 94GHz and a db beamwidth of 0.85° at 35GHz.
(3) the radiation pattern sidelobe of Ka/W band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna of the present invention is less than -
26.5dB at 35GHz and less than -27.5dB at 94GHz.
(4) the cross polarization of Ka/W band dual-frequency dual-polarization high- isolation and high-gain cassegrain antenna of the present invention is greater than -40dB within 3dB beam width of 35GHz radiation pattern and greater than -30dB within 3dB beam width of 94GHz radiation pattern.
(5) the isolation between ports of Ka/W band dual-frequency dual-polarization high- isolation and high-gain cassegrain antenna of the present invention is greater than -50dB.
Although the present invention has been disclosed in terms of preferred embodiments, it is not intended to limit the present invention. Those who have ordinary knowledge in the technical field of the present invention can make various changes and embellishments without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to what is defined in the claims.
Claims (10)
1. A Ka/W band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna, characterized in that the antenna comprises a high-isolation dual- frequency dual-polarization feed source, a feed horn, an auxiliary reflecting surface, a main-reflector and a bracket structure; the main-reflector is a parabolic-surface structure, and the sub-reflector is a hyperboloid-surface structure, and its focus on the side far away from the main-reflector coincides with that of the main-reflector; the high-isolation dual-frequency dual- polarization feed and the feed horn form a feed horn system, and the radiation phase center of the feed horn is set at the focus on the side near the main-reflector of the sub- reflector; the feed horn is located in the middle of the main-reflector and passes through the main-reflector to be connected to the feed source; the feed horn comprises a first rectangular waveguide, a rectangular circular transition structure, a second rectangular waveguide, a waveguide low-pass filter and a circular waveguide; the circular waveguide comprises a first waveguide section, a second waveguide band and a third waveguide section which are connected in sequence, wherein the first waveguide section and the third waveguide section have cylindrical structures with radii r and R respectively, and the second waveguide section has a truncated cone structure; the bottom surface at the joint between the second waveguide section and the first waveguide section 1s defined as an upper bottom surface with an upper bottom surface radius r; the bottom surface at the junction of the second waveguide section and the third waveguide section 1s defined as a lower bottom surface, and the radius of the lower bottom surface is R, and r is less than R; the rectangular circular transition structure is provided with a first end and a second end along the electromagnetic wave conduction direction, wherein the first end is rectangular and connected to the first rectangular waveguide, and the second end is circular and connected to the side of the first waveguide section far away from the second waveguide section; the shape and size of the first end portion corresponds to the first rectangular waveguide, and the shape and size of the second end portion corresponds to the cross section of the first waveguide section; the side of the first waveguide section 1s provided with an opening, and the waveguide low-pass filter is arranged outside the opening and is connected to the second rectangular waveguide and the first waveguide section; the support structure is arranged on the main-reflector, connects the main-reflector and the auxiliary reflecting surface, and is used for fixing the auxiliary reflecting surface above the main-reflector.
2. The Ka/W band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna according to claim 1, characterized in that the high-isolation dual- frequency dual-polarization feed is a 35/94GHz dual-frequency antenna with vertical polarization input.
3. The Ka/W band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna according to claim 2, characterized in that the first rectangular waveguide is WR-10 and the second rectangular waveguide is WR-28.
4. The Ka/W band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna according to claim 1 or 2, characterized in that the aperture of the main-reflector is 80 cm.
5. The Ka/W band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna according to claim 1, wherein the radius of the first waveguide section 1s 3mm and the radius of the second waveguide section is 4.8 mm.
6. The Ka/W band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna according to claim 1, wherein the length of the rectangular circular transition structure is 13 mm.
7. The Ka/W band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna according to claim 1, wherein the length of the first waveguide section is 180 mm.
8. The Ka/W band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna according to claim 1, wherein the length of the second waveguide section is 9.6 mm.
9. The Ka/W band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna according to claim 1, wherein the length of the third waveguide section is 10 mm.
10. The Ka/W band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna according to claim 1, characterized in that the Ka/W band dual- frequency dual-polarization high-isolation and high-gain cassegrain antenna adopts an embedded structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU500707A LU500707B1 (en) | 2021-10-01 | 2021-10-01 | Ka/W-band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU500707A LU500707B1 (en) | 2021-10-01 | 2021-10-01 | Ka/W-band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU500707B1 true LU500707B1 (en) | 2022-04-01 |
Family
ID=80999078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU500707A LU500707B1 (en) | 2021-10-01 | 2021-10-01 | Ka/W-band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna |
Country Status (1)
| Country | Link |
|---|---|
| LU (1) | LU500707B1 (en) |
-
2021
- 2021-10-01 LU LU500707A patent/LU500707B1/en active IP Right Grant
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2379151C (en) | Ka/ku dual band feedhorn and orthomode transducer (omt) | |
| JP3865573B2 (en) | Dielectric Leaky Wave Antenna | |
| CN110289483B (en) | Double-frequency double-circular polarization navigation measurement and control antenna feed source | |
| CN106129593A (en) | A kind of all-metal Phased Array Radar Antenna unit of two dimension wide angle scanning | |
| JP2001320228A (en) | Dielectric leakage wave antenna | |
| CN107046177B (en) | Feed source of back-feed type dual-polarized parabolic antenna | |
| Legay et al. | Multiple beam antenna based on a parallel plate waveguide continuous delay lens beamformer | |
| CN105958205A (en) | Multiband dual-polarized high-power feed source | |
| US3500419A (en) | Dual frequency,dual polarized cassegrain antenna | |
| CN208923367U (en) | Ka/W dual-band and dual-polarization high-isolation high-gain Cassegrain antenna | |
| CN114026743A (en) | Coaxial feed source of multi-band antenna | |
| CN109301499A (en) | Ka/W dual-band and dual-polarization high-isolation high-gain Cassegrain antenna | |
| CN108242600B (en) | Linearly polarized monopulse planar slot antenna | |
| LU500707B1 (en) | Ka/W-band dual-frequency dual-polarization high-isolation and high-gain cassegrain antenna | |
| US20230282979A1 (en) | Wideband Phased Array Antenna For Millimeter Wave Communications | |
| CN109411870B (en) | Dual-frequency shared parabolic antenna feed source | |
| CN201285802Y (en) | X frequency band dual polarization radar antenna | |
| CN115360532A (en) | Dual-polarized high-isolation Cassegrain antenna | |
| Zhang et al. | An improved E-plane waveguide power divider design for 94GHz dual-pyramidal horn antenna | |
| Tan et al. | Design of a W-band dual-polarization monopulse reflector antenna | |
| Lee | A compact QK-band dual frequency feed horn | |
| Sokunbi et al. | Millimeter-Wave MIMO Antenna With Decoupling Structures for Isolation Enhancement | |
| US20240063552A1 (en) | Dual-polarization high-isolation cassegrain antenna | |
| CN114361767B (en) | Broadband antenna feed source and microwave antenna | |
| US20230261387A1 (en) | Metasurface superstrate (mss) enabled radiator for a multiband antenna apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FG | Patent granted |
Effective date: 20220401 |