Multiband Meander UWB Bowtie Antenna with Six Rejection Bands

A miniature planar meandered microstrip bowtie-shaped antenna has been proposed for wireless applications. The designed antenna can serve many applications through its multiband characterization and as a UWB with six rejection bands since it covers the UWB licensed range. The antenna is designed on FR4-substrate and fed by a 50 Ω microstrip feed line connected to the right portion of the bowtie. The left side of the bowtie is connected to the partial ground at the bottom layer through a shorting pin. Both sides of the bowtie have a gradually increased zigzag microstrip line optimized to enhance the notches and the resonant frequencies. The proposed antenna is investigated using the high-frequency structure simulator (HFSS). The simulated reflection coefficient S11 result shows bandwidth ranges from 2.55 to 10.94 GHz at return loss (RL = |S11|) ≥ 10 dB with rejected frequency bands of (2.66 – 4) GHz, (4.25 – 4.94) GHz, (5.08 – 5.91) GHz, (6.6 – 6.96) GHz, (7.25 – 7.7) GHz and (8 – 9.57) GHz. The proposed antenna can achieve a maximum gain of 4.42 dB. The antenna radiation patterns exhibit a directional in E-plane and an omnidirectional shape in H-plane at lower frequencies.