A general theory on the graphical representation of antenna-radiation fields

Kark, Klaus W.; Dill, R.

doi:10.1109/8.45117

Cited by 6 publications

(4 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A similar kind of result is shown in Fig. 27 where the magnitude of the electric field at one instant of time produced by a Gaussian-excited conical monopole antenna obtained using a TDDE model is presented [83]. Although it is probably more obvious that sucl_ a sequence results naturally from a TD model and can be presented as in a movie, this :…”

Section: Input/outputmentioning

confidence: 76%

See 1 more Smart Citation

Low-frequency computational electromagnetics for antenna analysis

Burke¹

1992

Proc. IEEE

View full text Add to dashboard Cite

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,

show abstract

Section: Input/outputmentioning

confidence: 76%

“…26. One frame from a set showing field-pattern motion near a nonsymmetric',_l biconical antenna fed in the TEM-mode [83]. The antenna is one wavelength in radit_,,.…”

Section: Figure Captionsmentioning

confidence: 99%

Low-frequency computational electromagnetics for antenna analysis

Burke¹

1992

Proc. IEEE

View full text Add to dashboard Cite

show abstract

“…The omnidirectional feed horns can be uniquely determined once the θh and lh are given. θh = 40° and lh = λ are obtained based on [33]. Teflon lens was introduced to improve impedance matching.…”

Section: A Analysis Of the Feed Network And The Hornsmentioning

confidence: 99%

A Novel High-Gain Sum and Difference Conical Beam-Scanning Reflector Antenna

Yang

et al. 2020

IEEE Access

View full text Add to dashboard Cite

A novel sum and difference (SD) conical beam-scanning reflector antenna is proposed in this paper. The reflector surface, illuminated by two omnidirectional horns, is a body of revolution obtained by revolving the generating parabola about a symmetry axis. The horns stacked along the symmetry axis of the reflector are fed by a nest coaxial waveguide. Teflon lens is used to improve the side lobe levels and reflection coefficients of the feed horns. By tilting the generating parabola and using the offset feeding method, two conical beams, with different beam pointing angles, were generated. A compact feed network was also designed to feed the two horns, which includes two rectangular TE10 mode-to-coaxial TEM mode transitions and a Magic-T to implement SD beams. The scanning performance of conical beams can be achieved by mechanically moving the feed antennas along the symmetry axis and taking full advantage of offset focus characteristic of the parabolic reflector. The error in angle measurement was also discussed. The SD conical beam-scanning antenna was formed by a parabolic dish with a radius of 18 λ operating at 24 GHz. The proposed antenna was designed, simulated, and fabricated. The measured results show that the difference beam null-depth is −25 dB and the sum beam gain is 15 dBi at 40°. The sum beam gain varies by less than 1.5 dB across the scan coverage from 30.8° to 45.2°. The measured results are found to be in good agreement with the simulated ones. INDEX TERMS Reflector antenna, conical beam, magic-T, sum and difference beams I. INTRODUCTION Of late, much attention has been paid to conical beam antennas, because they are good candidates for satellite communication, target detection, tracking or guiding system, and so on. Conical beam antennas are superior to phased array antennas and omnidirectional antennas in TACAN-tactical air navigation system, vehicles communication, etc., because of their low cost and better performance. Satcom on the Move (SOTM) system needs high-gain and wide-beam coverage to obtain good quality communication [1]. The conical beam-scanning antennas with sum and difference beams for tracking capability can give better performance-to-cost ratio. Different from the traditional pencil beam monopulse antennas [2]-[4], the beam coverage of conical beam antenna is a ring area rather than a spot area. Therefore, conical beam antennas have intrinsic advantage of being wide beam coverage that is very important in many applications. Consequently, unlike the pencil beam the gain reaches 15dBi

show abstract

“…Since 8chelkunoff published the first full r adiation solution of bieonieal transmitting anten has ill,there have been significant further devel opments both in theoritical and experiment [2][3][4][5][6][7][8]. The biconical antenna is characterized by frequen cy independence and used as a broad or pulse antenna.…”

Section: Introductionmentioning

confidence: 99%