Design of Single Layered Circular and Rectangular U-Slotted, CPW-Fed Antennas and Arrays for RFID Applications

Abstract

This work describes the design of high gain, U-slot antennas for RFID 915 MHz (902 -928 MHz) applications. Four types of antenna were designed, optimized and evaluated -a circular, U-slotted antenna, a rectangular U-slotted antenna, and two 2x1 arrays. All structures are fed using the co-planar waveguide (CPW) feed. Several miniaturization and gain enhancement techniques such as folding, bending and alternative feeding were applied in the course of achieving the required compactness and radiation characteristics. After investigation, a rectangular, single element U-slot antenna was proposed as the most suitable for this application, considering that it provides a reasonable gain, sufficient bandwidth and compactness.

Co-planar Truncated Corner Patch Antenna with Fishbone-Shaped Slot Structure

“…Fishbone slot is another technique to create dual or tri band resonant frequency, such as referred at paper by Kang [3]. The other works on the CPW antenna shown in these several papers [4][5][6][7][8][9].…”