Experimentally Determined Impedance Characteristics of Cylindrical Antennas

Brown, George H.; Woodward, Owen M.

doi:10.1109/jrproc.1945.233878

Cited by 70 publications

(61 citation statements)

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“…The effects of the mesh on the reflecting properties of these antennas are needed to achieve the intended gain, and so some basic studies of meshes have been undertaken using MM models. The basic idez_ is to define a unit cell of an infinite planar mesh and to exploit Floquet's theorem to reduce the problem to that of modeling this single cell and its interaction with the "-infinite array of cells [75]. Of interest in this application are the effects of finite wire conductivity and imperfect junctions at the connection points of wires in the mesh, for which some results are shown in Fig.…”

Section: Modeling Ground Screens--mostmentioning

confidence: 99%

Low-frequency computational electromagnetics for antenna analysis

Burke¹

1992

Proc. IEEE

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Proc. IEEE '91 DISCLAIMERThis report was prepared as an account of work sponsoredby an agency of the United States Government. Neither the United States Government nor any a_.-nc? thereof, nor any of their employees, makes any warranty, expressor implied, or assumesany legal liability or responsi-,. bility for the accuracy, completeness, or usef, lness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Referenc¢ herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise dots not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.By acceptance of ims art,cia, the pubhsher recogmzes that the U S Government retains a nonexclumve,royalty.free I=censeto DulohShor reproduce the pubhshed form Of th=SCOntr_button.or to allow others tO dO So. for U.S Government purposesThe Los Alamos Nat,anal LabOratory requests that the pubhsher ,dentJty tins art_cleas work performed under theausp, ABSTRACT An overview of low-frequency, compuational metheds for modeling the electromagnetic characteristics of antennas is presented here. The article presents a brief analytical background, and summarizes the essential ingredients of the method of moments, for numerically solving low.frequency antenna problems. Some extensions to the basic models of perfectly conducting objects in free space are also summarized, followed by a consideration of some of the some computational issues that affect model accuracy, efficiency and utility. A variety of representative computations are then presented to illustrate various modeling aspects and capabilities that are currently available. A fairly extensive bibliography is included to suggest further reference material to the reader.Low-Frequency Antenna Models, Proc. IEEE '91,

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Section: Modeling Ground Screens--mostmentioning

confidence: 99%

Low-frequency computational electromagnetics for antenna analysis

Burke¹

1992

Proc. IEEE

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“…For example, the monopole wire antenna is changed into a printed version [1][2][3][4], such as the circular disk monopole antenna having 10 : 1 bandwidth used in UWB systems [5]. The triangular monopole printed antenna is introduced in [6] and is shown to have a variable bandwidth as a function of its tapering angle. It may achieve a bandwidth of about 30% [7].…”

Section: Introductionmentioning

confidence: 99%

Combline Loadings of Printed Triangular Monopole Antennas for the Realization of Multi-Band and Wideband Characteristics

Oraizi¹,

Rezaei²

2012

PIER B

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Abstract-In this paper, we use the concept of stub loadings of planar microstrip antennas to convert a single band antenna into a dual-band antenna used for WLAN. We load a planar triangular monopole (PTM) antenna by combline stubs attached to the edges of patch in order to obtain a second resonance frequency. The simple PTM antenna is first designed to produce the lower resonance frequency and the geometry of combline stubs is then optimally designed to generate the higher resonance frequency to realize a dual-band or a wideband antenna. Three prototype models of PTM antennas are designed, fabricated and measured. Their performances verify the concept of inductive loadings of planar antennas by combline stubs for the realization of dual-band and wideband performance for WLAN.

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“…However, the major drawback of conical or rotationally symmetric monopoles is their bulky structure. Recently, planar monopoles have been proposed for broadband designs which replace the wire elements with planar elements [5][6][7][8][9]. However, because of the asymmetrical structure, horizontal radiation patterns are not omnidirectional with increased operating frequencies.…”

Section: Introductionmentioning

confidence: 99%

“…This degradation more or less mitigates the advantage of the volume reduction. Moreover, for broadband monopoles, the direction of the beam-maximum in the vertical usually varies and the gain of planar monopoles decreases [5][6][7][8][9]. To improve the radiation performances over a broad bandwidth, a sleeve has been used in some designs [10,11].…”

Section: Introductionmentioning

confidence: 99%

Optimization and Comparison of Broadband Monopoles

Chen

Chia

Ammann

2003

IEE Proc., Microw. Antennas Propag.

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The impedance and radiation properties of four broadband monopoles are compared, and the parameters of a new roll monopole are optimised experimentally and numerically. The performances of the roll monopole with various numbers of roll turns are discussed and optimised numerically. The measurements and simulations show that, compared with conventional broadband monopoles, the roll monopole features a compact configuration and satisfactory radiation properties across a broad bandwidth.

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Experimentally Determined Impedance Characteristics of Cylindrical Antennas

Cited by 70 publications

References 1 publication

Low-frequency computational electromagnetics for antenna analysis

Low-frequency computational electromagnetics for antenna analysis

Combline Loadings of Printed Triangular Monopole Antennas for the Realization of Multi-Band and Wideband Characteristics

Optimization and Comparison of Broadband Monopoles

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