Abstract
This paper presents a low-profile wideband pattern reconfigurable dual circular patch antenna. The basic unit of the antenna is based on the mathematical model of a circular patch antenna design. Although to optimize the large size of the structure, an innovative way of introducing slots is presented that effectively reduces the overall size. Two different types of slotted circular structures are proposed with optimized sizes. The first design is based on L-slots, while the second is the dual vertical slotted antenna. Both structures are designed and simulated on FR4 and RT-Duriod 5880 substrates using the EM simulators, IE3D, and HFSS. The optimized antenna structure among the proposed ones has dual circular patches and the pattern reconfigurability is achieved by only two PIN diode switches. Thus, a steering capability of the antenna beam in two different directions at the same resonant frequency is achieved. The antenna covers a wideband of 500 MHz (ie, 1.3-1.8 GHz) with a high gain of 3.95 and 4.05 dB for both switching cases. To validate the designs, the antennas are fabricated on FR4 epoxy substrate. The measured results are closely related to the simulated results, thus making the design suitable for recent and upcoming multistandard wireless communication systems.