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Ka/W dual-frequency dual-polarization high-isolation-degree high-gain Cassegrain antenna

A Cassegrain antenna and high isolation technology, applied in the field of microwave and millimeter wave radio frequency antennas, can solve the problems of increasing the aperture surface blocking effect, increasing the difficulty of antenna structure design, and unable to truly realize the antenna beam pointing, so as to improve the overall gain. Effect

Pending Publication Date: 2019-02-01
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

This method increases the design difficulty of the antenna structure, increases the blocking effect of the aperture surface, and cannot really achieve the same beam pointing of the antenna on two or more frequencies

Method used

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  • Ka/W dual-frequency dual-polarization high-isolation-degree high-gain Cassegrain antenna
  • Ka/W dual-frequency dual-polarization high-isolation-degree high-gain Cassegrain antenna
  • Ka/W dual-frequency dual-polarization high-isolation-degree high-gain Cassegrain antenna

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specific Embodiment 1

[0058] Suppose that the first rectangular waveguide 31 selects WR-10 for propagating 94GHz radio frequency signals, the second rectangular waveguide 34 selects WR-28 for propagating 35GHz radio frequency signals, the diameter of the main reflecting surface 10 is 80cm, and the focal length is 240mm , the sub-reflecting surface 20 has a curved surface radius of 96 mm, the length of the rectangular circular transition structure 32 is 13 mm, the length of the first waveguide section 331 is 180 mm, the length of the second waveguide section 332 is 9.6 mm, and the length of the first waveguide section 332 is 9.6 mm. The length of the three waveguide sections 333 is 10mm.

[0059] combine Figure 3-Figure 10 , the following conclusions can be drawn:

[0060] (1) The Ka / W dual-frequency dual-polarization high-isolation high-gain Cassegrain antenna of the present invention has an antenna gain of 51 dB at 94 GHz and an antenna gain of 43 dB at 35 GHz.

[0061] (2) The Ka / W dual-freque...

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Abstract

The invention provides a Ka / W dual-frequency dual-polarization high-isolation-degree high-gain Cassegrain antenna, and the antenna comprises a high-isolation-degree dual-frequency dual-polarization feed source, a feed source horn, a secondary reflecting surface, a main reflecting surface, and a support structure. The feed source horn includes a first rectangular waveguide, a rectangular circular transition structure, a second a rectangular waveguide, a waveguide low-pass filter, and a circular waveguide. The rectangular circular transition structure is connected with the first rectangular waveguide and the circular waveguide. A side surface of a first waveguide segment is provided with an opening, and the waveguide low-pass filter is disposed outside the opening, and is connected to the second rectangular waveguide and the first waveguide segment. The antenna adopts an improved dual-frequency dual-mode cone feed source horn, and uses one feed source horn to emit 35GHz and 94GHz RF signals, and ensures that the antennas have the same radiation direction at the two frequency points of 35GHz and 94GHz.

Description

technical field [0001] 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, single-frequency or dual-frequency radar. Background technique [0002] Millimeter waves refer to electromagnetic waves with a frequency range of 30-300 GHz. The frequency coverage is wide, about 9 times that of the microwave frequency band. It has the advantages of wide frequency band, short wavelength and high resolution. It is widely used in the fields of millimeter wave relay communication, radar, remote sensing and missile guidance. [0003] At present, most millimeter-wave radars use 35GHz, 94GHz, 140GHz, 220GHz, etc. as operating frequency points. Due to factors such as technology, a relatively low frequency of 35GHz is mostly used as the working frequency point. Compared with 35GHz radar, 94GHz radar has higher resolution, smaller size, and stronger detection capability, whi...

Claims

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Application Information

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IPC IPC(8): H01Q19/19H01Q13/02H01Q1/26
CPCH01Q1/26H01Q13/025H01Q19/19
Inventor 葛俊祥汪洁周勇陈振华于兵
Owner NANJING UNIV OF INFORMATION SCI & TECH