In this letter, the numerical and experimental investigation of triangular-shaped microstrip power divider is designed for C-band applications using defected ground structure (DGS). Numerical simulations are carried out using different computer-aided design tools based on different numerical techniques, i.e., Ansoft HFSSand CST Microwave Studio. Good agreement is found between the calculated results using both HFSS and CST. A parametric study is carried out to address the effect of DGS parameters on the performance of the proposed triangular-shaped microstrip power divider. A power divider prototype is fabricated and tested experimentally. Measured results agree well with numerically calculated results.

In this letter, a microstrip fed ultra-wideband (UWB) antenna with different band rejection techniques is presented. The designed antennas consist of a defected ground plane with an elliptical slot and elliptical shaped radiating element. The measured and calculated impedance bandwidth of the proposed antenna ranges from 3 to 14 GHz for a return loss (S11) less than −10 dB. Also, it has a relatively stable radiation patterns over its whole frequency band of interest. Two different techniques have been proposed to achieve band-notch characteristic in the 5.0- to 6.0-GHz wireless local area network frequency band. The first one uses L-shaped parasitic strip into the radiating patch, whereas the other one uses two rectangular slits cut away from the ground plane creating defected ground structure. The proposed antenna is considered a good candidate for UWB applications.