Frequency-tunable microstrip chip resonators loaded with non-contact variable capacitance

Abstract

The invention relates to a frequency-tunable microstrip patch resonator loaded with a non-contact variable capacitance, which includes a metal ground, a bottom substrate, a top substrate and a microstrip patch stacked sequentially from bottom to top, the bottom substrate and the top layer There is a pair of symmetrical microstrip lines for frequency tuning arranged along the center line of the microstrip patch between the substrates. The first end of the variable capacitor on the upper surface of the top substrate is electrically connected, the second end of the variable capacitor is electrically connected to the metal ground, and the frequency tuning uses a microstrip line and the variable capacitor to form a non-contact frequency tuning structure for continuous tune the frequency of the resonator. The present invention proposes a new non-contact variable capacitance loading scheme for the first time to design a frequency reconfigurable microstrip patch resonator working under the 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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