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Design of a Compact Dual-Band Bandpass Filter Using Opposite Hook-Shaped Resonator

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4 Author(s)
Zheng Zhang ; Key Lab. of Antennas & Microwave Technol., Xidian Univ., Xi''an, China ; Yong-Chang Jiao ; Xiao-Ming Wang ; Shun-Feng Cao

In this letter, a compact dual-band bandpass filter is presented for wireless area networks (WLAN) operations. The filter, which is only 0.04 λ0 × 0.09λ0 in overall dimensions, is composed of two symmetric parts. In each part, two opposite hook-shaped strips with different resonant paths are used to achieve the dual-band operation at 2.4 and 5.8 GHz, with 19.54% and 15.12% fractional bandwidth, respectively. The central frequencies of the two passbands can be controlled independently by adjusting dimensions of the hooks. To verify the proposed idea, a prototype is implemented, and the measurement results agree well with the full-wave electromagnetic simulated responses.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:21 ,  Issue: 7 )