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IEEE Transactions on Antennas and Propagation
Volume 47 Number 4, April 1999

Table of Contents for this issue

Complete paper in PDF format

Dual-Frequency and Broad-Band Antennas with Stacked Quarter Wavelength Elements

Lakhdar Zaïd, Georges Kossiavas, Jean-Yves Dauvignac, Josiane Cazajous, and Albert Papiernik

Page 654.

Abstract:

Original lightweight, low-cost, and compact air-filled planar antennas with short-circuited elements, fed by coaxial probe, for dual-frequency (S-antenna) and wide-band applications (E-antenna) are investigated. The two-band frequency antenna is formed of two stacked quarter-wavelength elements, short-circuited along diametrically opposed planes. This structure offers two modes with different radiation characteristics. The ratio between the two frequencies can be closely controlled within a range varying from 1.3-2. A bandwidth of 30% for a VSWR < 2 is demonstrated using two stacked quarter-wavelength ele- ments short-circuited along the same plane. Numerical simulation results are compared with experiments and a very good agreement is observed. Radiation patterns and input impedance of both structures are measured and the effects of various physical parameters are presented.

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