Fast Beamforming of Electronically Steerable Parasitic Array Radiator Antennas: Theory and Experiment

Sun, Chen; Hirata, Akifumi; Ohira, Takashi; Karmakar, Nemai Chandra

doi:10.1109/tap.2004.831314

Cited by 239 publications

(123 citation statements)

References 11 publications

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“…In this paper, we describe a new secret key generation and agreement scheme based on the fluctuation of channel characteristics by using the electronically steerable parasitic array radiator (ESPAR) antenna [9]- [17], which is a variable-directional antenna. This scheme is based on "reactance-domain" beam-forming with the ESPAR antenna [18], [19], in which we can fluctuate the channel characteristics artificially by controlling the reactance values of the ESPAR antenna.…”

Section: Introductionmentioning

confidence: 99%

Wireless secret key generation exploiting reactance-domain scalar response of multipath fading channels

Aono

Higuchi

Ohira

et al. 2005

IEEE Trans. Antennas Propagat.

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275

173

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Section: Introductionmentioning

confidence: 99%

Wireless secret key generation exploiting reactance-domain scalar response of multipath fading channels

Aono

Higuchi

Ohira

et al. 2005

IEEE Trans. Antennas Propagat.

Self Cite

275

173

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“…One potential technique is the electronically steerable parasitic array radiator (ESPAR), which consists of one driven element and several parasitic elements with reactive or resistive loads and only one radio frequency (RF) port [8][9][10][11]. By controlling the loads of parasitic elements, the beam direction of an ESPAR can be changed electronically.…”

Section: Introductionmentioning

confidence: 99%

Planar Ultrathin Small Beam-Switching Antenna

Zhang

Gao

Luo

et al. 2016

IEEE Trans. Antennas Propagat.

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Abstract-A novel planar ultra-thin electronically steerable parasitic array radiator (ESPAR) is presented in this paper. Through theoretical analysis of the electric fields of orthogonally crossed dipoles in phase quadrature, it is found that the crossed dipoles radiate linearly polarized (LP) wave with a rotational electric field in the azimuth plane. This characteristic is then utilized to design a planar crossed dipole ESPAR, termed as "CD-ESPAR". Furthermore, a simple but effective impedance matching method is also proposed and analyzed. To verify these concepts, a prototype with compact size and very low profile (0.42 0.42 0.006 ) resonating at 2.3GHz is designed, fabricated and measured. The measured results indicate that the proposed antenna achieves more than 17.8% impedance bandwidth and can produce four directional beams, covering the whole azimuth plane. Owing to its planar ultra-thin structure, compact size, electronically beam-switching ability, low power and low cost characteristics, it is promising for applications in wireless communications.

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“…The shift in the resonant frequency in these planar antennas is performed by controlling the reactance loaded to a number of passive elements, while there is only one RF output [9][10][11]. All elements are in short distances from one another, and the consequent strong coupling among them is used in order to control the current flowing into the passive elements.…”

Section: Introductionmentioning

confidence: 99%

A Novel Antenna System for Body Temperature Change Detection Appropriate for Multi-Channel Microwave Radiometry

Nikolopoulos¹,

Capsalis²

2013

PIER M

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Abstract-A planar inverted F antenna is combined with passive (reactively loaded) elements in order to implement a multi-frequency configuration appropriate for biomedical applications in microwave frequencies. A case study of an electronically Reconfigurable PIFA (R-PIFA) is pursued for the detection of temperature abnormalities in human tissue phantom using microwave radiometry, where the performance of the structure is optimized with respect to input impedance matching in multiple frequencies. The optimization of the array is performed using a Genetic Algorithm (GA) tool as a method of choice. Due to its limited physical size, the proposed R-PIFA can also be used as a portable antenna system for deployment in mobile medical applications.

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Fast Beamforming of Electronically Steerable Parasitic Array Radiator Antennas: Theory and Experiment

Cited by 239 publications

References 11 publications

Wireless secret key generation exploiting reactance-domain scalar response of multipath fading channels

Wireless secret key generation exploiting reactance-domain scalar response of multipath fading channels

Planar Ultrathin Small Beam-Switching Antenna

A Novel Antenna System for Body Temperature Change Detection Appropriate for Multi-Channel Microwave Radiometry

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