Quad Frequency Rejection Bands UWB Bowtie Microstrip Antenna

A miniature planar microstrip antenna of bowtie shape with four frequency bands have been rejected to avoid interfering with several services operating within these bands. A quarter wavelength transformer is introduced for matching purposes. The bowtie right side has a horizontal slit to enhance the bandwidth and it is connected to the microstrip feed line, while its left side is connected to the partial ground plane in the back side through a shorting pin. The simulated Reflection Coefficient S11 has a 10-dB range from 2.69 to 15.06 GHz with rejection bands of (3.39 - 4.23) GHz, (4.64 - 6.07) GHz, (6.82 - 8.94) GHz and (9.75 - 12.19) GHz. The proposed antenna can achieve a maximum gain of 5.79 dB.