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A compact switchable microstrip tri-band bandpass filter with a wide stopband is presented in this paper. Thanks to the low loading effect of distributed coupling technique, three channels can be obtained without the conventional complicated matching network. Three passbands can be turned on and off independently by using p-i-n diodes. To validate this design concept, theory as well as experiment...
Two microstrip multiband diplexers are investigated in this paper. The diplexers consist of channel bandpass filters and long feeding lines. Every bandpass filter controls one respective channel characteristic resulting in a high design freedom. The channel filters are fed through long microstrip feeding lines with good isolating property. The proposed method is then time-saving in comparison with...
A planar monopole antenna for mobile communication systems (GSM/PCS/Wi-Fi/UWB) is proposed. The proposed antenna has two resonant elements. One is flower-like metal sheet and the other is metallic strip. The antenna is fabricated on a FR4 substrate. The PCS, WiMAX and UWB operation band (1.72 GHz–10.6 GHz) is achieved by an inverted triangular slit embedded in the ground plane below the feed line...
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