Compact Microstrip Bandpass Filter With Multispurious Suppression Using Quarter-Wavelength and Half-Wavelength Uniform Impedance Resonators | Zendy

Kai-Ran Xiang | Zendy; Fu-Chang Chen | Zendy

Open Access

Compact Microstrip Bandpass Filter With Multispurious Suppression Using Quarter-Wavelength and Half-Wavelength Uniform Impedance Resonators

Author(s) -

Kai-Ran Xiang,

Fu-Chang Chen

Publication year - 2018

Publication title -

ieee access

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.587

H-Index - 127

ISSN - 2169-3536

DOI - 10.1109/access.2018.2822262

Subject(s) - aerospace , bioengineering , communication, networking and broadcast technologies , components, circuits, devices and systems , computing and processing , engineered materials, dielectrics and plasmas , engineering profession , fields, waves and electromagnetics , general topics for engineers , geoscience , nuclear engineering , photonics and electrooptics , power, energy and industry applications , robotics and control systems , signal processing and analysis , transportation

In this paper, an effective and simple method for suppressing the spurious frequency in bandpass filter is proposed. Quarter- and half-wavelength uniform impedance resonators are used to generate the filtering function. The transmission zero caused by the structure of coupled line terminated with short-circuited stub is discussed in different mediums. By adjusting the coupled line and stub electrical lengths, controllable transmission zeros can be generated that can suppress the spurious passband, thereby extending the stopband. The concept has been experimentally tested in a fourth-order microstrip bandpass filter operating in 1 GHz, which provides an attenuation of 26.4 dB up to 15.9 times the center frequency and exhibited a size reduction of 50% compared with the half-wavelength resonators structure at the same frequency.

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