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Low-sidelobe radiation patterns with good directivity can be generated by antennas consisting of a linear array of parasitic dipoles in front of a smaller linear array of active dipoles fed uniform voltages, a configuration that facilitates the task of feed network design. The fundamental effect of the parasitic array is to allow the length of the active array to increase by a factor of 2 or more,...
As is well known, an electric radiator field is divided conventionally into three regions: a near region (an induction region or Fraunhofer one), an intermediate region (or Fresnel one) and a far region (a radiating one). Until recently radiators properties in a near region arouse a weak interest among antennas creators. But now these questions importance increased in view of problems of facilities...
It has been shown that QS analysis may be used quite accurately to analyze electrically small antennas over a larger range of electrical size than was previously thought. This improvement results from the use of a frequency dependent radiation resistance obtained from the QS current distribution.
Two types of broadband end-fire antennas are developed for sectorized coverage of 60-GHz wireless personal area networks (WPAN) applications. The first one is an integrated horn antenna in RO4000 laminates. Using the combination of through-, blind-, and buried-vias, a horn structure with both E- and H-plane flares can be mapped into a multilayer laminated substrate. A simple integrated coplanar feeding...
In this paper, a reconfigurable antenna which operates at ISM band has been proposed, which is based on EBG materials. The antenna scans the elevation plane with a 90 degree step. The antenna is formed of an omnidirectional feeding element surrounding by two layers of EBG surfaces in four sides. The reconfigurability in the proposed antenna is achieved by using diodes in the EBG surfaces. Switching...
In this paper, a low-profile wideband antenna with minimum dependence on its environment is presented. By modifying the antenna feeding structure, the antenna features more than 10% bandwidth while being less than lambda/15 in vertical height. The antenna features low cross-pol levels and excellent radiation efficiency. The antenna is then embedded in a metallic structure and the performance of the...
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