Abstract
A novel compact ultra-wideband (UWB) band-pass fllter (BPF) based on surface-coupled structure is proposed. The surface- coupled structures and Y-shaped shorted stub resonator are adopted as quasi-lumped circuit elements to achieve UWB pass-band. To avoid the interference of the wireless local area network (WLAN) at 5.25 and 5.775GHz, two difierent quarter-wavelength lines are arranged on the ground of UWB BPF to generate dual narrow stop bands. Being developed from the quasi-lumped elements, the proposed UWB BPFs have very compact size. The fabricated UWB BPFs have the advantages of low insertion loss, good selectivity and âat group delay. Good agreement between equivalent circuit modeled, simulated and measured responses of these fllters is demonstrated.
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