Array technology

Tang, R.; Burns, R. W.

doi:10.1109/5.119576

Cited by 25 publications

(10 citation statements)

References 11 publications

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“…The unidirectional beam is achieved by using many types of antenna structures such as microstrip antenna with fundamental mode [2], horn antenna and reflector antenna [3]- [4] and many others. Moreover, the unidirectional antenna is obtained by using some specific antenna that is arranged to form the array configuration [5]- [6]. In addition, the unidirectional beam is one of the most suitable candidates that can fulfill these requirements.…”

Section: Introductionmentioning

confidence: 99%

A Bent Probe Excited Circular Ring Antenna above Cylindrical Reflector Radiating Circular Polarization

Vongsack¹,

Phongcharoenpanich²,

Kosulvit³

et al. 2007

2007 Asia-Pacific Microwave Conference

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This paper presents the characteristics of a bent probe excited circular ring antenna above cylindrical reflector radiating circular polarization for the point to point wireless Local Area Network communication system. The proposed antenna is operated at the center frequency of 2.45 GHz. The CST software based on FIT (Finite Integral Techniques) is used as the simulation tool for investigating the antenna characteristics. The probe was shielded by dielectric rod and it is bent to obtain good impedance matching and circular polarization. The simulated results of the return loss, radiation pattern, and axial ratio are presented. The antenna has an impedance bandwidth (2:1 VSWR) of 24.93% that cover the frequency range of 2.089 -2.684 GHz. The antenna has a unidirectional pattern with maximum gain of 8.88 dBi. The average gain level is 8.18 dBi from simulation. The front-toback ratio in both E-plane and H-plane is better than 20 dB.

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Section: Introductionmentioning

confidence: 99%

A Bent Probe Excited Circular Ring Antenna above Cylindrical Reflector Radiating Circular Polarization

Vongsack¹,

Phongcharoenpanich²,

Kosulvit³

et al. 2007

2007 Asia-Pacific Microwave Conference

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“…Electronic beam scanning of the PAA is achieved by varying the phase of the excitation of the elements. For narrow-band applications, the phase of the elements can be controlled using phase shifting techniques [1]. For some applications (pulsed radar, for example [2]), a relatively broad instantaneous bandwidth is required, and thus broadband phase shifting or time shifting techniques must be used [3].…”

Section: Introductionmentioning

confidence: 99%

Wide-band photonically phased array antenna using vector sum phase shifting approach

Bui

Mitchell

Ghorbani

et al. 2005

IEEE Trans. Antennas Propagat.

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In this paper, a wide-band photonically phased array antenna is demonstrated. The array configuration consists of a 4 1 Vivaldi single-polarization antenna array and an independent photonic phasing system for each element. The phasing network of this array is implemented using two novel photonic phase shifters based on the vector summation approach. A vector sum phase shifter (VSPS), which exhibits a frequency-linear characteristic from dc to 15 GHz and can be continuously tuned from 0 to 100 , is presented. A second-order VSPS (SO-VSPS), a modification of the VSPS that is capable of 0-430 phasing range, is also demonstrated. This paper presents the operation and characterization of each component of the array, including the radiating elements and the various photonic phase shifters and, finally, a demonstration of the combined system. A discussion on the practicality of this system for airborne applications is presented, along with suggestions for simplification and improvement.Index Terms-Microwave photonics and phase shifter, phased array antenna, true time delay.

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“…By defining angle , and after some trigonometric calculations, the fundamental current , passing through the varactor diodes can be expressed as (2) where and are the capacitance of the varactors and its derivative versus the applied voltage, respectively, both at the bias point . According to (2), the varactors' capacitance (i.e., term between brackets) changes depending on the amplitude and angle . As a consequence there is a change of the oscillator frequency after the injection of the input signal.…”

Section: Circuit Fundamentalsmentioning

confidence: 99%

“…For fixed amounts of phase shift (i.e., multiples of 90 ), poly-phase networks are the preferred solutions [1]. When a digitally controlled phase shift is required, phase shifters based on PIN or varactor diodes and FET transistors are commonly used [2].…”

Section: Introductionmentioning

confidence: 99%