Multilayered structure integrated filter antenna based on filter Balun

Abstract

The invention discloses a multilayered structure integrated filter antenna based on a filter Balun, and mainly solves the problem that the volume of the filter antenna of a traditional monolayer micro-strip structure is larger. The multilayered structure integrated filter comprises a dielectric substrate, a filter part and a radiation unit, wherein the dielectric substrate comprises two micro-strip dielectric substrates and a metal ground; the filter part comprises an input port, the filter Balun positioned on the left sides of the dielectric substrates and two output ports connected with thefiler part; the filter Balun comprises two face-to-face C-shaped second-order stepped impedance resonators etched on the upper dielectric substrate and two back-to-back C-shaped second-order stepped impedance resonators etched on the upper surface of the lower dielectric substrate; the radiation unit is etched on the upper surface of the upper dielectric substrate, and comprises two micro-strip lines, two butterfly printing dipoles and a director. The multilayered structure integrated filter antenna has the advantages of compact structure, wide bandwidth, high frequency edge selectivity and good out-of-band rejection, and can be used for the radio frequency front end of a wireless communication system.

Description

technical field [0001] The invention belongs to the technical field of microwave devices, and in particular relates to a multi-layer structure integrated filter antenna, which can be used for a radio frequency front end of a wireless communication system. Background technique [0002] In recent years, the development of wireless communication technology has become more and more rapid, people have higher and higher requirements for the performance and volume of communication systems, and the performance of microwave communication components is becoming more and more multifunctional and integrated. , The appearance is also more and more towards the direction of miniaturization and portability. [0003] The wireless communication system is composed of three parts: sending equipment, receiving equipment and wireless channels, and uses wireless electromagnetic waves to realize information and data transmission systems. It is classified according to the working frequency band or ...

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Problems solved by technology

[0007] In 2015, J.Shi and X.Wu published "A Compact Differential Filtering Quasi-Yagi Antenna With High Frequency Selectivity and Low Cross -PolarizationLevels", the paper proposes a differential quasi-Yagi antenna with filter response, but the radiator does not have a resonator as a filter, which is not conducive to reducing size and loss

[0008] In 2015, C.X.Mao and S.Gao et al published "Integrated Filtering Antenna with Controllable Frequency Bandwidth" in IEEE Transactions Antennas and Propagation journal (Vol.63, No.12, 2015, pp.5492–5499.), in the paper The integrated design of the filter and antenna widens the bandwidth, improves the frequency selectivity and obtains a flatter gain, however, an additional filter circuit is introduced into the antenna feed network, resulting in increased insertion loss

[0009] In 2016, Tang.H and Chen J.X et al. published "Integration design of filtering antenna with load-insensitive balun filter" in IEEE Transactions on Components Packaging & Manufacturing Technology (No.6, 2016, pp.1408-1416.). The paper uses a single However, when the working frequency band is low, the size of the designed filter antenna will be relatively large, resulting in a large volume of the entire system, which cannot well meet the increasingly stringent requirements of microwave devices. miniaturization requirements

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