Bimodule annular resonant cavity band-pass filter with direct feed planar structure

Abstract

The invention relates to a bimodule-plane band-pass filter with a novel structure, which can be widely applied in the design of a radio-frequency microwave passive circuit. The filter consists of a capacitive load formed by microstrip lines with open circuit at the tail end and an annular bimodule resonant cavity; the annular bimodule resonant cavity is square and consists of an annular resonator (3) and a microstrip line load (4) with open circuit at the tail end at the right-angle position of the annular resonator (3); two input / output microstrip lines (1) are adopted and are both impedance converters (2) with quarter wavelength; the two input / output microstrip lines (1) are directly connected with two adjacent edges on the annular resonator (3), and the two adjacent edges have opposite angles with the microstrip line load (4) with open circuit at the tail end; and the whole filter structure is made on a medium substrate (5) with metal coated on both surfaces, wherein one surface is etched to be a circuit, and the metal on the other surface is totally reserved to be used as a ground plate. On the premise of maintaining the advantages of the original bimodule filter, the bimodule-plane band-pass filter reduces the insertion loss of the filter and has adjustable bandwidth.

Description

technical field

[0001] The invention relates to a miniaturized planar microwave band-pass filter manufactured by printed circuit board technology. The filter can be applied to microwave circuits and microwave integrated circuits in various electronic devices, and its use is beneficial to the integration and miniaturization of circuits, and belongs to the field of microwave technology. Background technique

[0002] A filter is a passive device widely used in microwave and radio frequency applications, and its index directly affects the performance of the entire system. Common microwave filters are mostly made of metal waveguide / dielectric waveguide, coaxial line or planar microstrip line / stripline. In recent years, due to the increasingly strong demand for miniaturization and miniaturization of communication systems, as one of the key passive components in the system, the demand for miniaturization design of filters is also increasing. Compared with the realization of three...

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