Frequency tunable microstrip patch resonator based on half-cut technology

Abstract

The invention relates to a frequency tunable microstrip patch resonator based on a half-cut technology. The frequency tunable microstrip patch resonator comprises a metal ground, a bottom layer substrate, a top layer substrate and a microstrip patch which are sequentially stacked from bottom to top, and a microstrip line for frequency tuning is arranged between the bottom layer substrate and the top layer substrate. The microstrip line for frequency tuning is overlapped with the microstrip patch in a non-contact manner across the top substrate, the outer end of the microstrip line for frequency tuning is electrically connected with the inner end of the variable capacitor loaded on the upper surface of the top substrate, and the outer end of the variable capacitor is electrically connectedwith the metal ground; one side, far away from the variable capacitor, of the microstrip patch is grounded, and the microstrip line for frequency tuning and the variable capacitor form a non-contact frequency tuning structure used for continuously tuning the frequency of the resonator. The invention provides a novel non-contact variable capacitor loading scheme for the first time to design the frequency-reconfigurable microstrip patch resonator working under a main mode TM10.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a frequency-tunable microstrip patch resonator based on half-cut technology. Background technique [0002] With the miniaturization of communication systems, more components need to be integrated into a limited space, so the miniaturization technology of antennas has received extensive attention. But the size of the antenna is closely related to its performance, so the design for miniaturized antenna is not easy. The method of antenna miniaturization can be: (1) Maintain the original frequency of the antenna and reduce its physical size. (2) Keep the physical size of the antenna unchanged and reduce its operating frequency to achieve the effect of reducing the electrical size of the antenna. The miniaturization technology for microstrip antennas is currently mainly based on the use of new materials or novel antenna structures. For example, a compact magnetodiele...

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Problems solved by technology

[0005] However, the above designs all connect the tunable structure directly to the radiation patch, which makes the variable capacitance have a great influence on the radiation performance of the resonator. Therefore, a new non-contact variable capacitance loading scheme is proposed for the first time to design Frequency reconfigurable resonator operating in the main mode TM10 mode, compared with conventional frequency reconfigurable microstrip patch resonators, a non-contact variable capacitive loading scheme separates the radiating patch from the tunable structure In the future, when applied to the antenna, it can reduce the impact of loading the tunable structure on the radiation performance of the resonator and improve the degree of freedom of design

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