A leaky wave antenna with wide scanning range based on liquid crystal tuning and its realization method
A scanning range, leaky wave antenna technology, applied to leaky waveguide antennas, individually powered antenna arrays, antennas, etc., can solve the problem of small scanning range of leaky wave antennas, and avoid too small beam scanning range, low loss, beam Gain remains stable
Active Publication Date: 2022-07-01
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] Below in conjunction with the accompanying drawings, the present invention will be further described through specific embodiments.
[0050] like figure 1 As shown, the leaky wave antenna with 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 through hole 103; the bottom layer is the 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 crystal...
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Abstract
The invention discloses a wide scanning range leaky wave antenna based on liquid crystal tuning and a realization method thereof. The invention includes N radiation units and a feeding structure. The feeding structure converts electromagnetic waves into electromagnetic waves in a surface wave transmission mode, feeds them into N radiation units, and controls the N radiation units by independently controlling the voltage loaded on each radiation unit. The cycle of the surface impedance distribution of the unit, thereby realizing the constant-frequency beam scanning under the voltage control; the present invention obtains the beam scanning with a wide range of scanning angles by controlling the modulation period, and can keep the antenna beam gain within the large beam scanning range stable. It avoids the problem that the beam scanning range is too small due to the limited variation range of the dielectric constant of the liquid crystal; in addition, because the liquid crystal material has the characteristics of low loss in the high frequency band of the millimeter wave and above, the beam scanning antenna and its realization method are millimeter waves. Wave mobile communication provides a solution.
Description
technical field [0001] The invention relates to high-frequency communication technology, in particular to a wide-scanning-range leaky wave antenna based on liquid crystal tuning and a method for realizing the same. Background technique [0002] 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, in actual communication scenarios, this frequency scanning feature is often not practical. 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 characteristics of , are 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