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Progress In Electromagnetics Research Letters
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A COMPACT QUAD-BAND BANDPASS FILTER USING MULTI-MODE STUB-LOADED RESONATOR

By L. Murmu and S. Das

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Abstract:
This paper presents a compact shorted stub-loaded quad-band bandpass filter. The proposed filter simultaneously operates at GSM (0.83-0.97 GHz), LTE2300 (2300-2400 MHz), WiMAX (3.3-3.7 GHz), and WLAN (5.725-5.825 GHz) bands. The filter has been designed using the technique of stub-loaded resonator (SLR). By changing the length of the center-loaded stub, the resonant frequency of the even-mode can be varied without affecting that of the odd-mode. This simplifies the design and tuning of the quad-band filter. Eight transmission zeros (TZs) around the three passband make the pass bands highly isolated. In order to validate its practicability, a quad-band bandpass filter (BPF) has been designed, fabricated and measured. Good agreement between simulated and measured results is observed.

Citation:
L. Murmu and S. Das, "A Compact Quad-Band Bandpass Filter Using Multi-Mode Stub-Loaded Resonator," Progress In Electromagnetics Research Letters, Vol. 61, 39-46, 2016.
doi:10.2528/PIERL16050610

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