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Zhang H.,French National Center for Scientific Research | Abdallah Y.,French National Center for Scientific Research | Chantalat R.,CISTEME | Thevenot M.,French National Center for Scientific Research | And 2 more authors.
IEEE Antennas and Wireless Propagation Letters | Year: 2012

This letter presents the design of a low-profile, high-gain Yagi wire-patch antenna array that radiates a directional beam in the azimuthal plane within the frequency band 5.45-5.75 GHz. The elementary unit of a typical Yagi antenna is replaced by wire-patch antenna. This antenna delivers a gain of 14.8 dB at 5.6 GHz. A prototype of this modelized antenna is manufactured, and the measured performances are similar to the simulated ones. © 2012 IEEE.

Desrumaux L.,XLIM OSA | Godard A.,XLIM OSA | Lalande M.,XLIM OSA | Bertrand V.,CISTEME | And 2 more authors.
IEEE Transactions on Antennas and Propagation | Year: 2010

A novel ultrawideband (UWB) antenna, called the Shark antenna, and designed especially for transient applications is proposed in this paper. A Shark antenna array is also conceived in order to obtain a high power UWB pulse radiation source through the frequency band [800 MHz-8 GHz]. For this application, the elementary antenna must be compact, non-dispersive, and the array must have a high transient front to back ratio. The geometry of the Shark antenna and its radiation characteristics are detailed. Moreover, an approach which evaluates the transient front to back ratio of a square array is presented. © 2006 IEEE.

Bertrand V.,CISTEME | Negrier R.,University of Limoges | Lalande M.,University of Limoges | Andrieu J.,University of Limoges | And 4 more authors.
Progress In Electromagnetics Research C | Year: 2014

Optoelectronic devices triggered by a laser flash and operating in linear switching regime allow the generation of short pulses with small time jitters (2 ps typically). An Ultra Wide Band antenna array combining as many of this photoswitches as antennas has the advantage to increase the radiation power on one hand and to offer the agility of the radiation beam on the other hand obtained by time delay of laser illumination. During the step of antenna design, it becomes important to take into account the photoswitch integration in order to increase the peak power and the frequency band of the generated output signal. This paper presents an equivalent model of photoswitch obtained with the transient solver of CST Microwave Studio coupled within CST Design Studio. The second part of this article is dedicated to the integration of a photoswitch even within the antenna.

Arnaud E.,Faculte des science et Techniques | Chantalat R.,CISTEME | Monediere T.,Faculte des science et Techniques | Rodes E.,Faculte des science et Techniques | Thevenot M.,Faculte des science et Techniques
IEEE Antennas and Wireless Propagation Letters | Year: 2010

This letter presents an original solution to solve the matching problem of the circularly self-polarizing electromagnetic band-gap (EBG) antennas. More precisely, a comprehensive method to design a self-polarizing EBG antenna will be detailed. This kind of antenna had been designed before, but it was very poorly matched. An iris-based matching system has been used here, which produced a satisfying return loss while deteriorating the axial ratio (AR). An original device will be introduced, which allowed us to compensate for this degradation. Finally, to validate this new structure, a 20-dBi antenna working around 9 GHz and showing an AR lower than 1 dB over a 100-MHz bandwidth has been conceived, realized, and successfully measured. © 2006 IEEE.

Hajj M.,French National Center for Scientific Research | Chantalat R.,CISTEME | Monediere T.,French National Center for Scientific Research | Jecko B.,French National Center for Scientific Research
IEEE Antennas and Wireless Propagation Letters | Year: 2010

In this letter, a novel sectoral antenna for 45° linear polarization with a high improved isolation and low cross polarization using metallic electromagnetic band-gap (M-EBG) material is investigated. This antenna provides two orthogonal polarizations, vertical and horizontal, 45° with a sectoral radiation pattern in the azimuth plane. In order to verify the results, a dual polarized M-EBG sectoral antenna prototype for WiMAX [5.15-5.35] GHz application is realized and measured. Finally, the possibility to generate 45° linear polarization is studied. © 2006 IEEE.

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