Compact band‐notched ultrawideband Y‐shaped antenna with dual inverted‐L slots

In this work, a novel band‐notched ultrawideband (3.1–10.6 GHz) Y‐shaped microstrip patch antenna with dual inverted‐L slots is presented. The proposed antenna consists of a wideband Y‐shaped monopole antenna and dual inverted‐L slots, producing band‐notch characteristics. To obtain sufficient bandwidth when the return loss (RL) < −10 dB, but still generate band‐notch characteristics, we propose that a partial ground plane, a coaxial probe source, and two inverted‐L slots can be used. The measured bandwidth of the fabricated antenna is from 2.96 to 4.85 GHz (from 6.05 to 12.65 GHz when the RL < −10 dB), and the frequency notch band is from 5.15 to 5.825 GHz. The measured gain is 3.66–4.58 dBi, which drops to −3.80 dBi in the notch band. The azimuth and elevation of the experimental 3‐dB beam width (HPBW) are 72.58° and 88.59° at 7.0 GHz, respectively.