Varactor-loaded SIW cavity backed antennas for modern wireless communication systems

Abstract

A novel compact, low profile frequency reconfigurable antennas, loaded by varactors and based on substrate integrated waveguide (SIW) structure, are proposed. Due to the loaded varactors, the operating frequency of the antenna can be tuned in a wide frequency range by changing electric bias. Two samples of frequency reconfigurable SIW cavity backed antennas are presented. They are designed, fabricated and measured. The antenna radiating from a circular slot is designed for low frequency band (2.28 GHz). The antenna radiating from a rectangular slot is designed to radiate at higher frequencies (11 GHz). The experimental results demonstrate the frequency tunability of the antennas. The radiation pattern and gain characterize the antennas good radiation performance, which is suitable for modern wireless communication systems.