Dual-Band Dual-Polarized Miniaturized Patch Antenna with Wide Range of Harmonics Suppression
摘要
In this article, a novel dual-band dual-polarized and miniaturized patch antenna is proposed for 5.8 GHz and 10.5 GHz application with simultaneously harmonics suppression. Firstly, a circular patch is analyzed, which exhibits the dominant mode TM110 at 5.8 GHz and harmonics TM210, TM010 and TM310 at 9.7 GHz, 11.9 GHz and 13.5 GHz, respectively. A perfect electric conducting and perfect magnetic conductor walls are created using shorting pins along the electric field null and cutting the patch along the electric field maximum of the dominant mode, respectively. The patch reduces to one fourth, and the harmonics TM210 and TM010 are shorted. The harmonics TM310 at 13.5 GHz is shorted by strategically shifting the pins toward the maximum electric field of this mode. Further, a rectangular slot is cut on a strategic location without disturbing the current distribution of the fundamental harmonic which generates a second band at 10.5 GHz with polarization at 45° relatives to the first band. The measured gain is exhibiting radiation nulls on both sides of the first band and a single null to the lower side of the second band. The first band is shifted to 5.9 GHz and second band to 10.6 GHz from 5.8 and 10.5 GHz, respectively. The maximum values of the realized gain are 3.2 dBi and 6.3 dBi at 5.9 GHz and 10.6 GHz, respectively. The design exhibits a low profile (0.015λo) and compact size (0.59λo × 0.43λo), which is suitable for many applications at 5.8 GHz and X-band.