Title :
Compact Dual-Band Bandpass Filters Using Novel Embedded Spiral Resonator (ESR)
Author :
Luo, Xun ; Qian, Huizhen ; Ma, Jian-Guo ; Ma, Kaixue ; Yeo, Kiat Seng
Author_Institution :
Sch. of Electron. Eng., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
Compact dual-band bandpass filters (BPFs) are proposed using the novel embedded spiral resonators (ESRs) in this letter. Each ESR consists of two sets of spiral-lines embedded in a microstrip rectangular open-loop (MROP). The resonator has two functions in the filter: 1) dual-resonance operation mainly provided by the spiral-lines is employed to generate two passbands simultaneously. 2) MROP acting as the dual-feeding structure is introduced to achieve good input/output (I/O) coupling for both passbands. With proper tapping scheme, additional transmission zeros can be obtained to improve the passband selectivity. To verify the principle above, two dual-band BPFs are implemented. These filters with passbands operated at 2.4/5.2 GHz and 2.45/5.7 GHz can finely meet the wireless local area network (WLAN) bands requirements, respectively.
Keywords :
UHF filters; band-pass filters; microstrip resonators; wireless LAN; BPF; ESR; MROP; WLAN bands; compact dual-band bandpass filters; dual-feeding structure; dual-resonance operation; embedded spiral resonator; frequency 2.4 GHz to 5.7 GHz; microstrip rectangular open-loop; passband selectivity; spiral-lines; tapping scheme; wireless local area network; Bandpass filter (BPF); dual-band; embedded spiral resonator (ESR); microstrip rectangular open loop (MROP); spiral-line; wireless local area network (WLAN);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2010.2050195
