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The design of a novel CPW-fed printed slot-loop antenna with narrowband omnidirectional attributes is proposed. The antenna geometry is selected to reduce slot coupling, thus achieving both a narrow bandwidth and an omnidirectional radiation pattern simultaneously. A gain of 2.1 dBi is accomplished with high radiation efficiency. Very narrow fractional impedance bandwidths as low as 2.9 are realised with good omnidirectional radiation characteristics. A technique providing unconstrained control of the bandwidth in the range of 1.7 - 6.9% is described.
Shynu, S., Amman, M.: A Printed CPW-Fed Slot-Loop Antenna with Narrowband Omnidirectional Features. IET Microwaves, Antennas and Propagation, Vol.3, 4, 2009, pp.673-680. DOI: 10.1049/iet-map.2008.0198