Xu Ziqiang

Compact HMSIW UWB bandpass filter using DGS and EBG technology with two notched-band

In this paper, a novel compact ultra-wideband (UWB) bandpass filter (BPF) with two notched-band is presented and implemented. Combining half mode substrate integrated waveguide (HMSIW) and nonuniform periodic half circle-shaped defected ground structure (DGS), a compact UWB bandpass filter with high selectivity is realized. A modify electromagnetic bandgap structures (EBG) is studied and employed to introduce two notched-bands, which is placed near the feedline to achieve the undesired notched band. The measured BPF insert loss is less than 1.2 dB throughout the pass band from 3.0 GHz to 12 GHz. The measured results demonstrates the validity of proposed UWB filter.

Design of compact UWB planar antenna with dual band-notched for WLAN and WiMAX

A compact planar ultrawideband (UWB) antenna with dual band-notched characteristics is proposed and investigated in this paper. The proposed antenna utilized a T-shaped stub on the radiating patch and U-shaped slot on ground to generate two notched bands at 3.5 GHz and 5.5 GHz, which perform good rejection of interference with worldwide interoperability for microwave access (WiMAX) and wireless local area network (WLAN). The antenna is studied and optimized using computer simulation. The results which show good performance are provided.