Compact multiband planar antenna for mobile wireless terminals

Abstract

A compact multi-band planar antenna has been developed for mobile wireless terminals.' h i s planar antenna, fabricated on ngtd or flexible dielectnc substrates, is capable of muluband operation that is requred in mobile WI~KICSS temnals such as telephones and personal digital assistants PDAs). Multi-band operation IS obtained by perturbing the shape of a conventional microstnp patch antenna In a prescnbed manner. This highly reliable, low cost antenna offers low profile with no moving parts, and 1s ideally suited for tnstallauon wthm the temunal with no need for external parts. This paper presents the design, I1M analysis, and a complete set of measurements fur the compact multi-band antenna.

Probe-Fed Polygonal Patch UWB Antennas

“…Both wide-band and multi-frequency operations rely on the stimulation of two or more resonances, which in the case of wide-band antennas must resonate close together, while in the case of multi-frequency operation, they must resonate widely apart. Polygonal patch forms are an intriguing area for investigation among the patch antenna geometries that exhibit many resonances [5][6][7][8][9]. For an antenna designer to investigate and excite many resonances to obtain broadband or multi-resonant characteristics for the antenna, the patch size, the number of edges, the slope of the edges, etc.…”

Design of Polygonal Patch Antennas for Portable Devices

“…Some of them are based on the employment of parasitic elements or stacked configurations, which usually do not preserve compactness requirements [3][4][5][6][7][8][9]. Some other techniques, based on the employment of reactive loads and reactive slots on the patch, instead, do not degrade the compactness of the component, but suffer of limited flexibility, making the design of high-performing devices with enhanced features rather difficult [10][11][12][13][14]. Finally, other techniques are based on band-notched filters, which allow keeping the antenna size rather small, enable the broadband behaviour, but usually exhibit asymmetric and strongly irregular radiation patterns [15][16][17].…”