Title :
Ring Resonator Bandpass Filter With Switchable Bandwidth Using Stepped-Impedance Stubs
Author :
Kim, Chan Ho ; Chang, Kai
Author_Institution :
Dept. of Electr. & Comput. Eng., Texas A&M Univ., College Station, TX, USA
Abstract :
This paper presents a novel ring resonator bandpass filter (BPF) with switchable passband bandwidth. Simple techniques for analyzing resonant frequencies and transmission zeros are shown, and the methods of designing the lengths of open, stepped-impedance stubs attached to the ring are introduced to obtain the tunability of the bandwidth. Interdigital-coupled feed lines are used for harmonic suppression by adding transmission zeros outside of the passband, resulting in wide upper and lower stopbands. After the lengths of the open stubs and the design of the feed lines are decided, the means of producing the bandwidth tunability are analyzed. By changing the characteristic impedances of the open stubs, mid-upper or mid-lower passband bandwidths can be separately varied. Simultaneous increases or decreases of each width of the stepped open stubs change the number of resonances, resulting in wide or narrow passband bandwidths. The measured results of the BPF using PIN diodes show that the tunable passband ratio is 1.22:1.13:1 with a maximum insertion loss of 1.35 dB.
Keywords :
band-pass filters; electric impedance; microstrip filters; microstrip lines; network synthesis; p-i-n diodes; resonator filters; PIN diode; harmonic suppression; interdigital-coupled feed line; microstrip filter; mid-lower passband bandwidth; mid-upper passband bandwidth; resonant frequency; ring resonator BPF; ring resonator bandpass filter; stepped-impedance stub; switchable passband bandwidth; transmission zero; Band pass filters; Bandwidth; Feeds; Filtering theory; Optical ring resonators; Passband; Resonant frequency; Microstrip filters; PIN diodes; passive filters; resonators; tunable filters;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2010.2084584