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A compact multi-band slot-ring microstrip patch antenna for wireless applications

Design of a printed microstrip patch antenna operating at multiple frequency bands is presented in this paper. The antenna has a very simple structure combining a microstrip patch, two rings and a slot. The antenna covers GPS (1.575 GHz), 4G/LTE/CDMA (2.1 GHz), and Wi-Fi (3.6/5.3 GHz) frequency bands with good impedance matching (2:1 VSWR) and radiation pattern performance. It has an omni-directional radiation pattern at most of the desired frequencies of operation. The antenna has good efficiency ranging from 60% to 98% and exhibits high peak gain values of 4.1 dBi, 5.7 dBi, 5.1 dBi and 7.9 dBi at 1.575 GHz, 2.1 GHz, 3.68 GHz and 5.37 GHz, respectively.