Frequency tunable microstrip patch resonator loaded by non-contact variable capacitor

Abstract

The invention relates to a frequency tunable microstrip patch resonator loaded by a non-contact variable capacitor non-contact variable capacitor. The resonator comprises a metal ground, a bottom substrate, a top substrate and a microstrip patch which are sequentially stacked from bottom to top, and a pair of symmetrical microstrip lines for frequency tuning arranged along the central line of themicrostrip patch is arranged between the bottom substrate and the top substrate. The microstrip lines for frequency tuning are 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 first end of a variable capacitor loaded on the upper surface of the top substrate, and the second end of the variable capacitor is electrically connected with the metal ground. The microstrip line for frequency tuning and the variable capacitor form a non-contact frequency tuning structure,and the non-contact frequency tuning structure is 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 a 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 loaded with a non-contact variable capacitance. Background technique [0002] In order to meet the development requirements of wireless communication systems, multifunctional antennas have been extensively studied in recent years. Among them, the excellent performance of reconfigurable antennas has become a research hotspot. Reconfigurable antennas have excellent characteristics such as small size and flexible functions, and can replace multiple antennas. The reconfigurable resonator is the core unit of the reconfigurable antenna, which directly affects the performance of the reconfigurable antenna. In recent years, various reconfigurable resonators have been designed, and they are widely used in polarization reconfigurable, pattern reconfigurable and frequency reconfigurable antennas. , they play an important role ...

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Problems solved by technology

[0004] However, in the above designs, the tunable structure is directly connected to the radiation patch, which makes the variable capacitance have a greater impact on the radiation performance of the resonator. Therefore, the present invention proposes a new non-contact variable capacitance loading scheme for the first time. To design a frequency reconfigurable resonator working in the main mode TM10 mode, compared with the traditional frequency reconfigurable microstrip patch resonator, the non-contact variable capacitive loading scheme separates the radiating patch from the tunable structure Separated, it can reduce the influence of loading tunable structure on the radiation performance of the resonator and increase the degree of freedom of design when applied to the antenna

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