Complementary opening resonance ring and defect ground structure half module substrate integrated waveguide dual-band filter

Abstract

The invention discloses a complementary opening resonance ring and defect ground structure half module substrate integrated waveguide dual-band filter. The dual frequency-band filter is realized by using two resonators. The dual frequency-band filter is a complementary opening resonance ring defect ground structure which is characterized in that a top layer metal is arranged on a medium substrate, a top layer metal ground is arranged on a grounding metal surface, a complementary opening resonance ring structure is etched in the top layer metal and a grounding metal paster is etched. A line of metal through holes, microstrip lines, impedance matching units, an input feed wire and an output feed wire are arranged at one edge of the top layer metal. The complementary opening resonance ring structure can generate one passband and can generate a transmission zero point at the same time; the complementary opening resonance ring defect ground structure and the microstrip lines can generate one passband by coupling, can generate one transmission zero point at the same time and are cascaded to form the dual-band filter. According to the filter, two transmission zero points are introduced, so the out-of-band rejection is improved, the passband selectivity is improved, and the external quality factor is improved by adopting a conical gradual feeding mode.

Description

technical field [0001] The invention relates to a filter applied in a wireless communication system, in particular to a double-band filter with a complementary split resonant ring and a defective ground structure. Background technique [0002] With the development of wireless communication and the continuous increase of communication equipment, the limited frequency resources are becoming increasingly tense. How to efficiently use spectrum resources and develop towards higher frequency bands while also being compatible with various existing communication frequency band resources is a communication system. A key to the development of wireless communications. There is an urgent need for RF filters with high selectivity, small size, low cost, and flexible design. Today's communication systems require simultaneous work in multiple communication frequency bands to save costs, that is, multi-passband low-cost filters have become indispensable devices in these systems. The half-m...

AI Technical Summary

Problems solved by technology

For planar microstrip structure filters, it has the advantages of small size, simple processing, and easy integration, but has the disadvantages of large loss and low power capacity.

Filters based on metal waveguide structures have the advantages of high power capacity and low insertion loss, but their processing costs are high and they are not suitable for integration with modern planar circuits

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