A Minimized Wideband Antenna Array With Decoupling Networks for Uhf Rfid Applications

Abstract

A minimized wideband antenna array is presented for ultra-high frequency (UHF) radio frequency identification (RFID) reader applications. The antenna array consists of two E-shaped patch antennas and a feeding network, with the overall size 200 × 100 × 20 mm 3. The feeding network could effectively decrease the antenna mutual coupling and improve the bandwidth. The measured bandwidth is about 68 MHz (896-964 MHz) under the condition of voltage standing wave ratio (VSWR) less than 2, which covers various RFID bands including North American (902-928 MHz), Chinese (920-925 MHz) and Japanese (952-955 MHz). The average gain is 4.5 dBi in UHF band. The principles of the antenna and the feeding network are also discussed and analyzed in this paper. At last, the key parameters are studied and show the antenna robustness.

Reduced size of slotted‐fractal Koch log‐periodic antenna for 802.11af TVWS application

“…Moreover, the antenna exhibits high gain that varies from 4.41 to 7.2 dBi. Considering the compactness of 0.44 λ × 0.48 λ at 100% bandwidth, the performance of proposed antenna is a suitable candidate for efficient TVWS bands application .…”