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Communication engineering and systems, telecommunications
A triple-band circularly polarised microstrip patch antenna operating in the 2.4, 3.5 and 5.7 GHz bands is presented. The antenna consists of two substrate layers with an electromagnetically coupled low-band patch in the middle layer and a probe-fed dual-band patch on the top layer. The impedance bandwidths (voltage standing wave ratio (VSWR) < 2.5) for the three frequency bands are 112, 118 and 427 MHz with 3 dB axial-ratio bandwidths of 15, 44 and 36 MHz, respectively. The peak gains across the operating bands are 4.2, 5.5 and 4 dBic, respectively.
Bao, Z . & Ammann, M. (2014) Printed Triple-Band Circularly Polarised Antenna for Wireless Systems, Electronic letters 6th November, Vol. 50 No. 23 pp. 1664–1665 http://dx.doi.org/10.1049/el.2014.3103