Ultra-wideband band-pass filter structure with wide stop band and high selectivity

Abstract

The invention belongs to the field of passive microwave solid-state circuits, in particular to an ultra-wideband band-pass filter structure with a wide stop band and high selectivity. The filter structure comprises a dielectric substrate 2, a metal foil layer 1 attached to the upper surface of the dielectric substrate, and a metal grounding layer 3 for covering the lower surface of the dielectricsubstrate; the front surface of the metal foil layer 1 is a combined shape formed by a cone and a rectangle, and the combined shape is composed of micro-strip transmission lines 5, open-circuit stub lines 6, substrate integrated waveguide upper surfaces 7, compact microstrip resonant cells 8, conical microstrip gradual change lines 9 and complementary opening resonance rings 10; and the metal foillayer 1 is connected with the metal grounding layer 3 through two rows of metallized through holes 4 which penetrate through the whole dielectric substrate. According to the filter structure, the transmission characteristics of the substrate integrated waveguide and the CMRC are ingeniously combined, and the functions of the ultra-wideband band-pass filter with the wide stop band and high selectivity can be finally realized by introducing the complementary opening resonance rings and the open-circuit stub lines capable of generating transmission zero points.

Description

technical field [0001] The invention belongs to the field of passive microwave solid-state circuits, and in particular relates to an ultra-wideband band-pass filter structure with wide stop band and high selectivity. Background technique [0002] As a frequency-selective device, microwave filters play an important role in many microwave / RF applications. Its main function is to filter signals and select frequencies, even if the required signals are effectively transmitted in the channel, without The desired signal is effectively attenuated or suppressed in the channel so as not to cause interference to the useful signal. Today's emerging wireless communication systems continue to place challenges and more stringent requirements on the performance, size, weight and cost of microwave filters. At the same time, with the rapid development of the fifth-generation mobile communication and the Internet of Things technology, ultra-wideband wireless communication technology is becomi...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of high operating frequency, narrow bandwidth and poor performance of existing substrate-integrated waveguide (SIW)-based bandpass filters, an ultra-wideband bandpass filter structure with wide stopband and high selectivity is proposed

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