Wide scanning range leaky-wave antenna based on liquid crystal tuning and implementation method thereof
A scanning range, leaky wave antenna technology, applied in leaky waveguide antennas, antenna arrays that are energized separately, antennas, etc., can solve problems such as small scanning range of leaky wave antennas
Active Publication Date: 2021-09-03
PEKING UNIV
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Problems solved by technology
[0006] In order to solve the problem that the scanning range of the fixed frequency beam scanning leaky wave antenna based on liquid crystal tuning is small, the present invention proposes a wide scanning range leaky wave antenna based on liquid crystal tuning and its implementation method, which has low cost, low profile, low Loss, high scanning range and other advantages have great advantages and development prospects in millimeter wave communication systems
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[0049] The present invention will be further elaborated below through specific embodiments in conjunction with the accompanying drawings.
[0050] Such as figure 1 As shown, the leaky-wave antenna with a wide scanning range based on liquid crystal tuning of the present embodiment of the present invention includes: N radiating elements and a feeding structure; figure 2 As shown, each radiation unit includes a metal floor 106, a liquid crystal 105, an insulating film 104, a radiation patch 102, a unit dielectric substrate 101, and a metal via 103; wherein, the bottom layer is a metal floor 106; the liquid crystal is an anisotropic material , the rotation angle of the liquid crystal molecules affects the dielectric constant of the liquid crystal material, and the insulating film 104 is wrapped on the side of the liquid crystal to expose the upper and lower surfaces of the liquid crystal; the liquid crystal is placed on the metal floor 106, and the lower surface of the liquid cry...
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Abstract
The invention discloses awide scanning range leaky-wave antenna based on liquid crystal tuning and an implementation method thereof. The wide scanning range leaky-wave antenna comprises N radiation units and a feed structure, wherein the feed structure converts electromagnetic waves into electromagnetic waves in a surface wave transmission mode, the electromagnetic waves are fed into the N radiation units, the period of surface impedance distribution of the N radiation units is controlled by independently controlling voltage loaded on each radiation unit, and therefore fixed-frequency beam scanning under voltage control is achieved. The beam scanning of a large-range scanning angle is obtained by controlling the modulation period, so that the antenna beam gain in a large-range beam scanning range can be kept stable, and the problem that the beam scanning range is too small due to the limited dielectric constant change range of liquid crystal is avoided; in addition, as a liquid crystal material has the property of low loss at high frequency bands of millimeter waves and above, the beam scanning antenna and the implementation method thereof provide a solution for millimeter wave mobile communication.
Description
technical field [0001] The invention relates to high-frequency communication technology, in particular to a leaky-wave antenna with a wide scanning range based on liquid crystal tuning and its realization method. Background technique [0002] The leaky wave antenna is a traveling wave antenna, which has the advantages of low cost, low profile, high gain and frequency scanning characteristics. The directional radiation angle of high gain will change with the change of the antenna operating frequency. However, this frequency scanning feature is often not practical in actual communication scenarios. In satellite communication, mobile communication, vehicle radar and other scenarios that require beam scanning, the frequency of the communication signal is a narrow-band signal with a fixed center frequency, so the fixed frequency The beam-scanning feature of the X-ray is more suitable for these modern communication scenarios. [0003] At present, the most mature fixed-frequency b...
Claims
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IPC IPC(8): H01Q1/38H01Q1/48H01Q1/50H01Q3/00H01Q13/20H01Q21/00H01Q21/08
CPCH01Q1/38H01Q1/50H01Q1/48H01Q3/00H01Q13/20H01Q21/0006H01Q21/08
Inventor 谭云华王艺东王迪杜朝海刘濮鲲
Owner PEKING UNIV