Tubular filter with quasi-basis total parameters

Abstract

The invention discloses a tubular filter with quasi-basis total parameters. The tubular filter comprises a microstrip line substrate, a feed-in line, a feed-out line and interdigital coupling line sections; a plurality of low-impedance microstrip lines and a plurality of high-impedance microstrip lines are arranged on the microstrip line substrate; the plurality of low-impedance microstrip lines and the plurality of high-impedance microstrip lines are distributed at intervals in a crossed manner and are connected in sequence; the series capacitor is realized by using the interdigital coupling line sections, and the interdigital coupling line sections can realize the series capacitor with a relatively large capacitance value, so that the requirement on the relatively large capacitance value when a broadband filter is designed by using a tubular filter circuit prototype is met; meanwhile, the interdigital coupling line sections are used for realizing series connection of the capacitors, and the capacitors between suspended microstrip line double-layer circuit boards are prevented from being used for realizing series connection of the capacitors, so that the design of the tubular filter with quasi-base total parameters can be realized by using a microstrip line single-sided pattern, and due to the adoption of the microstrip circuit, interconnection with a microwave active circuit can be realized very conveniently.

Description

technical field [0001] The invention relates to the field of filter devices, in particular to a tubular filter with quasi-base total parameters. Background technique [0002] In recent years, with the rapid development of wireless communication technology, the demand for faster transmission rate, more stable communication quality, and lower signal-to-noise ratio has been increasing, and filters are important frequency selection devices in communication systems. The quality of performance directly affects the quality of the entire communication system. Now microwave filters have been widely used in microwave satellite communication, relay communication, electronic countermeasures, radar and other fields. In order to meet the needs of various application environments, many different types of microwave filters have emerged. [0003] In terms of microwave filter theory, the more commonly used filter design theories include cavity structure filter coupling matrix theory and plan...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the traditional microstrip line structure is not conducive to circuit package assembly and integration with active power supplies. The purpose is to provide a tubular filter with quasi-base total parameters, which can realize broadband with and easy integration

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