Full-Wave Investigations of a Probe-Excited Rectangular Ring Antenna by Method of Moments With RWG Basis Functions

Lamultree, Suthasinee; Phongcharoenpanich, Chuwong

doi:10.2528/pierc09052201

Cited by 9 publications

(5 citation statements)

References 22 publications

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“…Many authors have found a transverse electromagnetic (TEM) field distribution across the probe aperture is a reasonable approximation for simulations of coaxial probes [1][2][3][4][5][6][7]. Therefore, a coaxial probe feeding a patch antenna can be viewed as a mode-converter which converts the TEM mode across the probe aperture into the parallel plate modes.…”

Section: Introductionmentioning

confidence: 99%

“…It is regarded as the most accurate probe feeding model for both the radiation pattern and the input impedance simulations as all the propagating and evanescent parallel plate modes are included [1][2][3][4][5][6][7]. However, magnetic-frill model requires special treatment of the probe exciting source, very dense meshes or subgridding (subcell) techniques in FEM and FDTD solvers [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Equivalent Circuit Model of Coaxial Probes for Patch Antennas

Hu¹,

Zhang²,

Fan³

2012

PIER B

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Abstract-An equivalent circuit model of coaxial probes is derived directly from the intrinsic via circuit model. As all the higher-order evanescent modes have been included analytically in the parasitic circuit elements, only the propagating mode needs to be considered by the simplest uniform-current model of a coaxial probe in numerical solvers such as finite element method (FEM) or finite difference time domain (FDTD). This avoid dense meshes or sub-gridding techniques and greatly reduces the computational efforts for accurate calculation of the probe input impedance. The derived equivalent circuit model and the new feeding technique have been validated by both analytical formulas and numerical simulations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Equivalent Circuit Model of Coaxial Probes for Patch Antennas

Hu¹,

Zhang²,

Fan³

2012

PIER B

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“…Linear polarized bidirectional antennas [2]- [3] have been studied and introduced. However, polarization mismatch becomes a problem when the antennas are not aligned in practical application.…”

Section: Introductionmentioning

confidence: 99%

A bidirectional circular polarized array with the same rotation using a special substrate

Zhang

Feng

et al. 2013

2013 IEEE Antennas and Propagation Society International Symposium (APSURSI)

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A novel bidirectional circular polarized array with the same rotation is presented. The array consists of 4 pairs of crossed dipoles. The distance between adjacent elements is λ 0 /4 (λ 0 is the wavelength in free space). The radiation elements are fed by the balanced parallel stripline. The adjacent horizontal/vertical dipoles need to be excited out of phase difference for the bidirectional radiation and the adjacent crossed dipoles need to be excited in phase for the circular polarization of the same rotation. To satisfy the special phase distribution, a substrate with dielectric constant of 6.0 is used, which makes the guided wavelength λ g equals to λ 0 /2. The impedance bandwidth (|S 11 | < -10 dB) is 9.2% (2.38 GHz to 2.61GHz) and the 3-dB axial ratio bandwidth is 700 MHz (2.05 GHz ~ 2.75 GHz). The bidirectional RHCP gain is about 7.5 dBi.

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“…The cell shape is approximated by a circle where omnidirectional antenna plays a vital role to employ at the base station [2]. However, for some specific application that requires the long-range service area such as point-to-point communication between the buildings, when the mobiles move along the confined paths such as street, highways, tunnels, and corridors, for these environments, a unidirectional or bidirectional antennas are more suitable than the omnidirectional one to serve these demands [3][4][5][6]. The omnidirectional monopole antenna is modified by adding different shapes of reflectors such as planar reflector [7], corner reflectors [8,9], curved reflectors [10], ring reflectors [11], and others to obtain the unidirectional or bidirectional beams.…”

Section: Introductionmentioning

confidence: 99%

A UWB Bidirectional Rectangular Ring Antenna Fed by CDM with a Rod and Ridges for Constant Beam Direction

Vongsack

Lamultree

Osklang

et al. 2012

International Journal of Microwave Science and Technology

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This paper presents an ultra-wideband (UWB) rectangular ring antenna excited by a circular disc monopole (CDM) with a conducting rod and two double ridges to radiate bidirectional pattern with constant beam direction along the entire UWB frequency range of 3.1-10.6 GHz. The conducting rod and double ridges at the upper wall of the ring are added to solve the tilted beam problem at the higher edge frequency whereas the double ridges at the lower wall are used to enhance the impedance bandwidth. The dimensions of the rectangular ring and the CDM are initially considered to achieve the bidirectional pattern with the suitable resonant frequencies and bandwidth. Then, the parameters of copper rod and two double ridges are determined by parametric study using CST Microwave Studio simulation software. The prototype antenna was fabricated, and the measured results show good agreement with the simulated ones. The obtained bandwidth of |S 11 | < −10 dB can cover the UWB frequency range as well as the bidirectional beam radiation with constant beam direction (θ = 0 • , 180 • and φ = 90 • ). The minimum and maximum measured gains are 3.1 dBi to 5.3 dBi, respectively. The proposed antenna possesses compact size with good radiation performance that can be a promising candidate for UWB applications.

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Full-Wave Investigations of a Probe-Excited Rectangular Ring Antenna by Method of Moments With RWG Basis Functions

Cited by 9 publications

References 22 publications

Equivalent Circuit Model of Coaxial Probes for Patch Antennas

Equivalent Circuit Model of Coaxial Probes for Patch Antennas

A bidirectional circular polarized array with the same rotation using a special substrate

A UWB Bidirectional Rectangular Ring Antenna Fed by CDM with a Rod and Ridges for Constant Beam Direction

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