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A Microstrip Bandpass Filters Using Dual-Behavior Resonators Integrated with EBG Structures to Improve Stopband Response  

Seok Chang-Heon (Engineering Research Institute(RICIC) GyeongSang National University)
Jang Jae-Sam (Engineering Research Institute(RICIC) GyeongSang National University)
Lim Jung-Sup (Engineering Research Institute(RICIC) GyeongSang National University)
Hwang Ho-Soon (Engineering Research Institute(RICIC) GyeongSang National University)
Jung Young-Ho (Engineering Research Institute(RICIC) GyeongSang National University)
Lee Dong-Cheol (Engineering Research Institute(RICIC) GyeongSang National University)
Lee Min-Soo (Engineering Research Institute(RICIC) GyeongSang National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.43, no.7, 2006 , pp. 162-169 More about this Journal
Abstract
A Micorstrip Bandpass Filter Using DBRs for WLAN ($2.3{\sim}2.4GHz$) applications is designed and an EBG structure is employed in the ground plane of the filter to suppress the stopband responses of the filter. The number of DBRs is chosen as two in consideration of low insertion loss and small size of two filter. The center frequency of the filter to be designed is 2.35GHz and its bandwidth is 140MHz. The responses of two kinds of DBR filters (one with EBG and the other without EBG) are calculated and compared with the measurements. The experimental results are in good agreement with the calculations: The bandwidth and insertion loss of the filter with EBG structure are 3.8% and 1.7dB respectively, while those of the filter without EBG structure are 7% and 1.23dB. It is shown that the insertion loss of the filter is increased and its bandwidth is deceased due to the EBG structure. Also the stopband responses of the filters with EBG structures are shown to be much improved compared with those without EBG.
Keywords
Filter; DBR; EBG;
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