Miniature wide-band half U-slot and half E-shaped patch antennas

Abstract

The U-slot patch antenna, a single-layer single-patch antenna on a relatively thick substrate ( 0 08 0 ), is a wide-band antenna with an impedance bandwidth in a range of 20%-30%, which is about an order of magnitude larger than that of the regular patch antenna. Recently, it was shown that a half U-slot patch antenna, with half of one of the dimensions of the U-slot patch, maintains similar wide-band behavior. The half-structure was also successfully applied to the U-slot with shorting wall. In this paper, new results on half structures, not previously published, are presented. First, the shorting pin technique is used to reduce the size of the half U-slot patch antenna. By both simulation and experimental studies, it is concluded that the impedance bandwidths, radiation patterns, radiation efficiencies and gains of the halfstructures are comparable to the corresponding full structures. Bandwidth of 28.6% and radiation efficiencies exceeding 90% are obtained for the half U-slot patch with shorting pin. Radiation patterns are stable across the matching band. Second, it is shown that a structure obtained from halving the E-shaped patch, which is a derivative of the U-slot patch, also maintains its wide-band behavior.Index Terms-Broadband antennas, microstrip antennas.

DESIGN OF HYBRID COUPLER CONNECTED SQUARE ARRAY PATCH ANTENNA FOR Wi-Fi APPLICATIONS

“…By considering all the elements are placed at regular interval, all the elements are identical, all the elements have uniform (equal) amplitude excitation there can be a linear relative phasing between the elements in the two orthogonal directions the analysis is done. The effect of mutual coupling is depends on antenna type and its design parameters, relative positioning of the elements in the array, feed of the array elements (Chair et al, 2005).…”

Methods to Design Microstrip Antennas for Modern Applications

“…Thus the antenna designers should adjust the dimensions and the position of the slot by iterative trials or, potentially, by employment of an evolutionary technique of prediction and optimization as in §4 is discussed. An alternative version of the U-slot patch is the half U-slot patch Fig3a, which maintain an impedance bandwidth similar to that of a full U-slot patch having the further advantage of the smaller size [17]- [18]. This is due to the fact that the electrical current distribution is symmetrical along the line of symmetry of the full U-slot printed element.…”

High gain W-shaped microstrip patch antenna

“…And, the antenna gain drops to 5 dBi, which is lower than other wide-band patch antennas [4,5]. Some other techniques as utilizing the shorting pins or shorting walls on the unequal arms of a U-shaped patch, U-slot patch, or L-probe feed patch antennas, wideband and dual-band impedance bandwidth have been achieved with electrically small size in [7,8]. However the achievable gains of these antennas are below 8.5 dBi.…”