A Circularly Polarized Slot Antenna with Filtering Characteristics

Abstract

The invention discloses a circularly polarized slot antenna with filtering characteristic. The circularly polarized slot antenna comprises a dielectric substrate, metal ground, a microstrip structure and a distributed capacitor; the metal ground is arranged on the upper surface of the dielectric substrate; the microstrip structure is arranged on the lower surface of the dielectric substrate; a circular annular radiation slot is formed in the middle of the metal ground; the metal ground is divided into inner side metal and outer side metal by the circular annular radiation slot; the distributed capacitor crosses over the inner side metal and the outer side metal on the two sides of the circular annular radiation slot; the microstrip structure comprises an input microstrip line, a microstrip coupling line filter, an output microstrip line and a circular tuning patch which are connected in sequence; the microstrip structure couples an input signal to the circular annular radiation slot; and the main mode of the circular annular radiation slot is split into two orthogonal degenerate modes by infinitesimal disturbance of the distributed capacitor to further obtain the filtering and circular polarization radiation characteristics. The circularly polarized slot antenna with the filtering characteristic has high bandwidth, high filtering characteristic, compact structure, convenience in manufacturing and low cost, and can be used for the modern wireless communication terminal.

Description

technical field [0001] The invention belongs to the technical field of antennas and relates to a circularly polarized slot antenna with filtering characteristics. Background technique [0002] Antennas and filters are two key components of a wireless communication system. The antenna plays the role of converting the guided electromagnetic wave and radiated electromagnetic wave energy, and the filter plays the role of selecting signals, filtering out-of-band interference, and attenuating noise. The independent design of the traditional antenna and filter will not only occupy a larger structure size, but also introduce more energy loss. Modern wireless communication terminals are increasingly compact in size and demanding in power consumption. Therefore, it is necessary to jointly design antennas and filters to realize a new type of antenna that integrates radiation and filtering functions. [0003] Compared with linearly polarized antennas, circularly polarized antennas hav...

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Problems solved by technology

The invention uses a microstrip resonator structure to generate multiple resonant modes to excite the slot radiation structure, which not only expands the working bandwidth of the antenna, but also achieves good filtering performance, but this antenna does not have circular polarization radiation characteristics

[0006] Based on the publicly reported slot antenna literature, no slot antenna with circular polarization radiation characteristics and good filtering performance has been found so far. Therefore, it is necessary to design a circular polarization slot antenna with filtering characteristics to meet the needs of modern wireless communication terminals. Urgent needs

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