A New Tri-Band Bandpass Filter for GSM, WiMAX and Ultra-Wideband Responses by Using Asymmetric Stepped Impedance Resonators

Provided by: EMW Publishing
Topic: Mobility
Format: PDF
In this paper, a design of new tri-band bandpass filter for the application of GSM (1.8GHz), WiMAX (2.7GHz) and UWB (3.3-4.8GHz) is proposed. The first two narrow passbands are created, and the bandwidth of the third passband can be tuned by properly selecting the impedance ratio (R) and physical length ratio (u) of the asymmetric stepped-impedance resonator. To improve passband performance and form the UWB (Ultra Wide Band) passband, a U-shape defected ground structure and extra extended coupling lines are integrated with the asymmetric (stepped-impedance resonator) SIR.

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