Four-band microstrip band-pass filter with notch characteristics and design method thereof

Abstract

The invention discloses a four-band microstrip band-pass filter with notch characteristics and a design method thereof. The four-band microstrip band-pass filter with notch characteristics includes aconductor band, a dielectric substrate, and a circuit board of a grounding board. The circuit board is provided with a short-hole perforation. The conductor band includes an input port, an output port, a feeder line, two first stepped impedance resonators, two second stepped impedance resonators, and two F-type open-circuit branches, wherein the feeder line is connected between the input port andthe output port; the two first stepped impedance resonators are connected to the upper end portion of the feeder line; the two second stepped impedance resonators are connected to the lower end portion of the feeder line; the two F-type open-circuit branches are connected to the upper end portion of the feeder line; and the first stepped impedance resonator is located between the two F-type open-circuit branches. The four-band microstrip band-pass filter has notch characteristics, can realize band-pass filtering of four frequency bands simultaneously, and has a simple structure, small size, high integration, excellent performance, and good compatibility.

Description

technical field [0001] The invention relates to a four-band microstrip bandpass filter with notch characteristics and a design method thereof. Background technique [0002] In a mobile communication system, a filter is a radio frequency front-end device used to select a working frequency band and filter out out-of-band interference. A filter is a two-port network that provides signal transmission in the passband frequency and attenuation in the stopband to control the frequency response in a communication system. With the rapid development of modern mobile communications, filters are gradually developing toward miniaturization, high performance, low cost, and multi-band. Microstrip bandpass filters have attracted extensive attention from researchers in the industry because they are easy to meet the above requirements. And be applied to various fields of the mobile communication industry. [0003] At present, the fifth generation mobile communication (5G), as one of the hot...

AI Technical Summary

Problems solved by technology

my country has made important progress in the research and development of 5G technology. The Ministry of Industry and Information Technology has officially issued 5G mobile communication medium and low frequency band experimental frequencies to China Mobile, China Telecom, China Unicom and other three major operators, respectively: 2515MHz ~ 2675MHz, 3400MHz ~ 3500 MHz, 3500MHz ~ 3600MHz, 4800MHz ~ 4900MHz, the existing filters cannot realize the band-pass filtering of the four frequency bands well, nor can they construct the notches between adjacent narrow bands while realizing the band-pass filtering of the four frequency bands, so it is impossible Adapt to the use requirements of 5G technology

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