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Ring Resonator Based Band-pass Filter with Enhanced Sideband Suppression  

Kyoung, Un-Hwan (Kwang-Woon University)
Kim, Gun-Duk (Kwang-Woon University)
Lee, Sang-Shin (Kwang-Woon University)
Eo, Yun-Seong (Kwang-Woon University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.45, no.6, 2008 , pp. 8-12 More about this Journal
Abstract
A ring resonator based band-pass filter enabling enhanced sideband suppression was proposed and demonstrated. It is composed of a single-ring based band-pass section combined with a band-rejection section based on two different coupled rings. The sideband region of the transfer characteristics of the first band-pass filter section was selectively suppressed by means of the band-rejection section without causing any excessive insertion loss. As a result, the overall transfer characteristics of the proposed filter was unproved so that its sideband suppression was elevated to allow for sharper roll-off and narrower bandwidth. In this work, a conventional single-ring band-pass filter and a proposed filter including the band-rejection section were designed and fabricated. As for the achieved device performance, with the center frequency at about 4 GHz, the sideband suppression ratio was increased as much as 8 dB and the 3-dB bandwidth was reduced from 98 MHz to 48 MHz by about 51% with no remarkable excessive insertion loss as expected. And the quality factor of the device was increased by about 105%.
Keywords
microstip; ring resonator; sideband; bandpass; suppression;
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