Pattern and Frequency Reconfigurable Annular Slot Antenna Using PIN Diodes

TLDR

The study introduces pin diodes to reconfigure the impedance match and alter the radiation pattern of an annular slot antenna. The antenna is a planar ASA on Duroid with a microstrip feed on the opposite side, operating at 5.8 GHz and reconfigurable to 5.2 and 6.4 GHz by switching pin diodes that short the slot at selected circumferential positions to steer the null direction. Proof‑of‑concept measurements show that two pin diodes placed 45° on each side steer the null as intended, confirming reconfigurability in both frequency and radiation pattern with return‑loss and pattern results matching simulations.

Abstract

This paper presents the use of pin diodes to reconfigure the impedance match and modify the radiation pattern of an annular slot antenna (ASA). The planar antenna is fabricated on one side of a Duroid substrate and the microstrip feeding line with the matching network is fabricated on the opposite side of the board. The central frequency is 5.8 GHz and, by reconfiguring the matching circuit, the antenna was also designed to operate at 5.2 and 6.4 GHz. Pin diodes are also used to short the ASA in preselected positions along the circumference, thereby changing the direction of the null in the plane defined by the circular slot changes. As a proof of concept, two pin diodes are placed 45/spl deg/ on both sides of the feeding line along the ASA and the direction of the null is shown to align with the direction defined by the circular slot center and the diode. Consequently, a design that is reconfigurable in both frequency and radiation pattern is accomplished. Return loss and radiation pattern measurements and simulations are presented, which are in very good agreement.