Compact dual-band bandpass filter using complementary hook-shaped resonators for WLAN applications

Article type: Research Article

Authors: Zhang, Z.^{a; *} | Jiao, Y.C.^a | Weng, Z.-B.^a | Wang, X.-M.^b

Affiliations: [a] National Laboratory of Science and Technology on Antennas and Microwaves, Xidian University, Xi'an, Shaanxi, China | [b] ZTE Corporation, Xi'an, Shaanxi, China

Correspondence: [*] Corresponding author: Z. Zhang, National Laboratory of Science and Technology on Antennas and Microwaves, P.O. 377 Box, Xidian University, Xi'an, Shaanxi 710071, China. Tel.: +86 29 8820 2669; Fax: +86 29 8820 2662; E-mail: zhangzh_lucky@163.com

Abstract: Based on the double resonant properties of the complementary hook-shaped resonator (CHSR), a novel miniaturized dual-band microstrip filter is proposed for WLAN operations. The filter, which is only 0.067 λ_0 × 0.084 λ_0 in overall dimensions, is composed of two opposite CHSRs and modified T-shaped feed-lines. Two hook-shaped strips generate two respective passbands, independently. The proposed filter is found to have two transmission zeros around the high resonances for improved selectivity. To verify the proposed method, a dual-band filter is implemented and measured, and the measurement results agree well with the simulated data.

Keywords: Compact, complementary hook-shaped resonator (CHSR), bandpass filter (BPF), dual-band BPF

DOI: 10.3233/JAE-140052

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 47, no. 2, pp. 381-387, 2015