Differentially fed circularly polarized filter antenna based on metasurface structure
A differential feeding and filtering antenna technology, applied in the direction of antenna, antenna grounding device, radiating element structure, etc., can solve the problem that the axial ratio frequency is easily affected, so as to improve the uneven distribution of surface current, improve the gain, and increase the caliber efficiency effect
Active Publication Date: 2022-05-27
HANGZHOU DIANZI UNIV
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[0004] In order to overcome the complexity of the traditional circularly polarized antenna and the disadvantage that the axial ratio frequency is easily affected, and integrate the design filtering performance in the antenna, so as to achieve a more compact RF front-end, the present invention proposes a C-band metasurface-based structure Differentially fed circularly polarized filter antenna
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[0042] like figure 1 shown, a three-dimensional view of a differentially fed circularly polarized filter antenna based on a metasurface structure, including a top dielectric substrate S1, a bottom dielectric substrate S2, a metasurface structure M, a metal ground plate N, rectangular coupling slots C1 and C2, filter Balun differential feeding structure (microstrip coupling lines T1, T2 and T3 and a pair of U-shaped slots U1, U2). The differentially fed circularly polarized filter antenna based on metasurface structure is mainly composed of two parts: the first part is the metasurface structure of the top substrate of the antenna. Make periodic arrangements. The relative permittivity of the top dielectric substrate is 4.4, the thickness h is 3 mm, and the width Gl is 50 mm. The second part is the feeding structure of the bottom substrate of the antenna. The relative permittivity of the bottom dielectric substrate is 3.55 and the thickness t is 0.5mm. The metal ground plate i...
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The invention discloses a differential feeding circular polarization filter antenna based on a metasurface structure. The present invention includes two components: a radiation structure and a feed structure: the radiation structure on the top layer of the antenna is a metasurface structure composed of periodically distributed metasurface structural units, and two are loaded on the diagonal of each metasurface structural unit. Ground metal vias; the feed structure at the bottom of the antenna is a filter balun differential feed structure composed of microstrip coupling lines and U-shaped slot lines. The gain in the passband of the circular polarization filtering antenna of the invention is relatively stable, the out-of-band suppression is obvious, the frequency selectivity of the gain is better, and better filtering performance is realized. In addition, the impedance bandwidth and axial ratio bandwidth can be adjusted independently, making the axial ratio frequency more stable.
Description
technical field [0001] The invention relates to an antenna structure, in particular to a differential feeding circularly polarized filter antenna structure based on a metasurface structure. Background technique [0002] With the rapid development of modern wireless communication technology, as an indispensable part of the wireless communication system, the requirements for its performance and indicators are also increasing. Circularly polarized antennas are widely used in satellite communications, radar, and radio frequency identification systems because of their good anti-jamming ability and arbitrary transmit-receive polarization. However, conventional circularly polarized antennas generally generate circularly polarized radiation by designing the feed structure of the antenna. This design makes the overall structure of the antenna relatively complex, and the center frequency of the axial ratio is easily affected. In recent years, a two-dimensional planar metamaterial str...
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IPC IPC(8): H01Q1/38H01Q1/50H01Q1/48H01Q15/00H01Q5/28H01Q5/50
CPCH01Q1/38H01Q1/50H01Q1/48H01Q15/0086H01Q5/28H01Q5/50
Inventor 金华燕向艳华罗国清王文磊张晓红
Owner HANGZHOU DIANZI UNIV