Beam adaptive single arm rectangular spiral antenna with switches

Mehta, Amit; Mirshekar‐Syahkal, D.; Nakano, Hisamatsu

doi:10.1049/ip-map:20050045

Cited by 62 publications

(39 citation statements)

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“…At a test frequency of 4.7 GHz, the proposed hybrid high impedance surface based square loop antenna is 4.69 mm high and has an impedance bandwidth of 650 MHz and directivity of 8.7 dBi. Compared with the earlier reported steerable square loop antenna the new antenna's performance equates to a thickness reduction of 61%, bandwidth enhancement of 150%, a directivity improvement of 2 dBi, a co-polar sidelobe reduction of 11 dB, and a cross-polarisation sidelobe reduction of 5 dB.Introduction: For beam steering applications the single element beam steerable antennas [1][2][3] have demonstrated advantages over array antennas by reducing antenna size and eliminating the use of phase shifters, multiple antenna arrays and complex signal processing. In [3], for the first time experimental investigations were presented for a steerable square loop antenna, and with the aid of its current distribution an explanation for the formation of a tilted beam pattern was given.…”

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Beam steerable square loop antenna over hybrid high impedance surface

et al. 2009

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A novel hybrid high impedance surface is presented and a beam steerable four feed square loop antenna is built on this structure. At a test frequency of 4.7 GHz, the proposed hybrid high impedance surface based square loop antenna is 4.69 mm high and has an impedance bandwidth of 650 MHz and directivity of 8.7 dBi. Compared with the earlier reported steerable square loop antenna the new antenna's performance equates to a thickness reduction of 61%, bandwidth enhancement of 150%, a directivity improvement of 2 dBi, a co-polar sidelobe reduction of 11 dB, and a cross-polarisation sidelobe reduction of 5 dB.Introduction: For beam steering applications the single element beam steerable antennas [1][2][3] have demonstrated advantages over array antennas by reducing antenna size and eliminating the use of phase shifters, multiple antenna arrays and complex signal processing. In [3], for the first time experimental investigations were presented for a steerable square loop antenna, and with the aid of its current distribution an explanation for the formation of a tilted beam pattern was given. By using the antenna's four feeds, the tilted beam can be steered in four different quadrants. However, this antenna had the following three major limitations that restricted its implementation for modern practical applications: (i) it was a quarter wavelength thick (12 mm), (ii) it had a limited bandwidth (260 MHz) and (iii) it had radiation pattern with strong sidelobes. These limitations are overcome by deploying a novel form of high impedance surface (HIS), which is referred to as a hybrid high impedance surface (HHIS).The problems of thick substrate and limited bandwidth were alleviated by implementing one of the well-known existing HIS structures [4 -6]. However, the direct use of HIS designs (with numerous periodic vias between the HIS metal patches and the ground plane) caused radiation pattern distortion. This was due to the existence of strong coupling between the HIS vias and the square loop radiating element [7]. The via-less approach suggested in [8] is an effective solution for avoiding the via-antenna interactions, but it increases the periodicity of the HIS patch arrays which is not always desirable for portable antenna solutions. These obstacles were overcome by using the proposed hybrid HIS, which is similar to the HIS designed in [4-6] but has vias only under the outermost patches. Keeping the vias at the outer patches ensures low interaction between the antenna radiating element and the vias, which affects the purity of radiation patterns. At the same time, the vias at the edges prevent sidelobe generating surface waves from leaking out at the sides of the antenna. Thus, the hybrid HIS (via-less lattice beneath the loop and vias only at the edge) enabled the achievement of a low profile steerable square loop antenna with large bandwidth and with its radiation pattern having low sidelobes. The antenna is designed for a resonant frequency of 5 GHz with 210 dB bandwidth from 4.57 -5.22 GHz. The antenna test frequen...

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Beam steerable square loop antenna over hybrid high impedance surface

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“…As shown in Fig. 7(b) The formation of tilted beam in the elevation plane can be qualitatively explained by magnetic field phase distribution [30] - [32]. Fig.…”

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A Four-Arm Circularly Polarized High-Gain High-Tilt Beam Curl Antenna for Beam Steering Applications

Zhou

Pal

Mehta

et al. 2018

Antennas Wirel. Propag. Lett.

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“…Alternate connection of two shorting straps on the square loop to the ground plane provides reconfiguration between the two operating modes (broadside and conical patterns). Other microstrip antenna designs based on spiral topologies that can also create tilted beam patterns have been studied by others [e.g., 38,39], with beam tilting again based on parasitic effects that are easily integrated into a spiral's compact geometry. Finally, a compound [40] reconfigurable antenna design is described in [41], a stacked square patch configuration with two feeds supports a high-gain, circularly-polarized broadside pattern at one frequency and a low-gain omnidirectional pattern using a PIFA (planar inverted F antenna) mode at another.…”

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Reconfigurable Microstrip Antennas

Bernhard

2010

Microstrip and Printed Antennas

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While reconfigurable antennas have been implemented in various ways over the past 40 years, reconfigurable microstrip antennas, in particular, have existed for almost as long as the microstrip antenna itself, dating back to the early 1980s. The motivation for implementing reconfigurable properties in an antenna in general is straightforward -the acquisition of new capabilities that eliminate the need for multiple antennas and/or that provide additional degrees of operational freedom that expand system performance. Microstrip antennas are particularly good candidates for achieving reconfigurability, since their well-defined ground planes and planar structures present clear opportunities for integration of a number of popular reconfigurable mechanisms (including switches and tunable materials) and their associated control circuitry. Additionally, since most microstrip antennas operate in resonance and their operation is well modeled and well understood, an informed designer can manipulate the antenna structure and composition in different ways to achieve a variety of reconfigurable properties.This chapter addresses recent advances in the development of reconfigurable microstrip antennas, with an emphasis not only on the antennas themselves, but also on the practical issues surrounding their implementation, including control and system-level design and performance. Fundamentally, microstrip antenna behavior is governed by two kinds of properties: substrate properties and conductor properties. Section 6.2 describes the basic concepts behind changes in substrate parameters, including tunable changes in relative permittivity and permeability, as well as some recent examples that produce useful reconfigurability. Section 6.3 addresses changes in the conductive components of microstrip antennas that can lead to a wide variety of reconfigurability. Section 6.4 discusses many of the important issues surrounding the practical Microstrip and Printed Antennas: New Trends, Techniques and ApplicationsEdited by Debatosh Guha and Yahia M.M. Antar

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Beam adaptive single arm rectangular spiral antenna with switches

Cited by 62 publications

References 4 publications

Beam steerable square loop antenna over hybrid high impedance surface

Beam steerable square loop antenna over hybrid high impedance surface

A Four-Arm Circularly Polarized High-Gain High-Tilt Beam Curl Antenna for Beam Steering Applications

Reconfigurable Microstrip Antennas

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