Title :
Compact microstrip low-pass filter with sharp rejection
Author :
Tu, Wen-Hua ; Chang, Kai
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
fDate :
6/1/2005 12:00:00 AM
Abstract :
This letter presents a compact multisection sharp-rejection microstrip low-pass filter. Each section consists of a microstrip line section and an interdigital capacitor. The analysis for optimizing the attenuation poles by adjusting the finger number, and the width and length of the microstrip line section, is presented. The cascaded four-section low-pass filter has a return loss of better than 17 dB and an insertion loss of less than 0.7 dB from DC to 1.6 GHz. The rejection is better than 20 dB from 2.1 to 7.5 GHz.
Keywords :
circuit optimisation; low-pass filters; microstrip filters; poles and zeros; 0 Hz to 1.6 GHz; 0.7 dB; 17 dB; 2.1 to 7.5 GHz; attenuation poles optimization; cascaded multisection filter; compact multisection microstrip filter; finger number adjustment; interdigital capacitor; line section length; microstrip line section width; microstrip low-pass filter; sharp rejection filter; Attenuation; Band pass filters; Capacitance; Capacitors; Cutoff frequency; Fingers; Low pass filters; Microstrip filters; Passband; Resonator filters; Interdigital capacitor; low-pass filter; sharp rejection;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2005.850479
