Title :
A Microstrip Bandpass Filter Using Asymmetrical Stepped-Impedance Resonators for a Wide Upper Stopband Performance
Author :
Akkaraekthalin, P. ; Jantree, J. ; Majaeng, T. ; Chaimool, S.
Author_Institution :
Dept. of Electr. Eng., King Mongkut´´s Inst. of Technol., Bangkok
Abstract :
This paper proposed a new asymmetrical microstrip stepped-impedance resonator (SIR) used for constructing a narrow band bandpass filter. With the proposed resonator, a desired bandpass response has been realized and a bandstop characteristic in the upper stopband has been obtained resulting in high spurious suppression. The size of the resonator is also reduced approximately 16 % when comparing with a conventional SIR. A bandpass filter using a microstrip stepped-impedance line periodically loaded with the proposed SIRs has been designed at the operating frequency of 2 GHz with a bandwidth of 60 MHz. The proposed filter has a low insertion loss with a wide upper stopband characteristic that the spurious suppression of better than 20 dB has been measured for a frequency range up to 7.6 GHz
Keywords :
band-pass filters; microstrip filters; resonator filters; asymmetrical stepped-impedance resonators; microstrip bandpass filter; microstrip stepped-impedance line; narrow band bandpass filter; Band pass filters; Bandwidth; Frequency; Insertion loss; Microstrip filters; Microstrip resonators; Microwave filters; Patch antennas; Resonance; Resonator filters;
Conference_Titel :
Radio and Wireless Symposium, 2007 IEEE
Conference_Location :
Long Beach, CA
Print_ISBN :
1-4244-0445-2
Electronic_ISBN :
1-4244-0445-2
DOI :
10.1109/RWS.2007.351787