Electric-field distribution in the focal region of an offset paraboloid

Bem, D.J.

doi:10.1049/piee.1969.0137

Cited by 17 publications

(7 citation statements)

References 2 publications

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“…The focal region field in this situation was described some years earlier by Bem [2]. They find that this field can be approximately matched by the addition of the TE 21 mode in a circular feed, the HE 21 in a radially corrugated feed, or the TE 11 mode in a rectangular feed.…”

Section: Introductionmentioning

confidence: 72%

Optimization procedure for wideband matched feed design

Palvig

Jørgensen²,

Michaleas³

et al. 2016

2016 10th European Conference on Antennas and Propagation (EuCAP)

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Abstract-The inherently high cross polarization of prime focus offset reflector antennas can be compensated by launching higher order modes in the feed horn. Traditionally, the bandwidth of such systems is in the order of a few percent. We present a novel design procedure where the entire matched feed and reflector system can be efficiently optimized. This allows the design parameters of the matched feed to be directly related to the desired design goals in the secondary pattern over a specified band. Using this procedure, we present a design of a die-castable axially corrugated matched feed horn that provides an XPD improvement better than 7 dB over a 12% bandwidth for a reflector with an f/D of 0.5. An investigation of the mode requirement for an arbitrary circular aperture feed is also presented.

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Section: Introductionmentioning

confidence: 72%

Optimization procedure for wideband matched feed design

Palvig

Jørgensen²,

Michaleas³

et al. 2016

2016 10th European Conference on Antennas and Propagation (EuCAP)

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show abstract

“…Bem [16] derived the closed-form expressions of the transverse focal plane fields (i.e., ) of an offset reflector antenna using the physical optics (PO) approach. In its simplified form, these expressions can be written as 1536-1225/$26.00 © 2009 IEEE (1) (2) where is the Bessel function of order , is the reflector aperture diameter, and is the offset angle.…”

Section: A Focal Region Fields Of An Offset Reflectormentioning

confidence: 99%

“…In its simplified form, these expressions can be written as 1536-1225/$26.00 © 2009 IEEE (1) (2) where is the Bessel function of order , is the reflector aperture diameter, and is the offset angle. Using the mathematical formulation as suggested by Bem [16], a MATLAB program was developed to estimate the focal region fields of an offset reflector antenna. Fig.…”

Section: A Focal Region Fields Of An Offset Reflectormentioning

confidence: 99%

Cross-Polarization Cancellation in an Offset Parabolic Reflector Antenna Using a Corrugated Matched Feed

Sharma

Pujara

Chakrabarty

et al. 2009

Antennas Wirel. Propag. Lett.

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This letter presents the design of a dual-mode corrugated matched feed to cancel the unwanted high cross polarization and beam squinting in an offset parabolic reflector antenna. The matched feed concept has been implemented in a cylindrical corrugated structure by adding a higher order HE 21 mode to the fundamental HE 11 mode. The designed feed was then used to illuminate a linearly, as well as a circularly, polarized offset parabolic reflector antenna, and the secondary radiation patterns were computed. Significant improvement in the cross polarization was observed when the results were compared to that of a conventional corrugated horn illuminated offset reflector antenna.

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“…The required expressions for the unit normal nf and the surface differential dS have been given by Bem [12] where Ei = -qHj. The expression for dE agrees with previous results [11], [12] (7) In (7), we have neglected terms in r2/rl, and the validity of this approximation has been discussed previously [11]. The phase term Q, in (3) The upper limit am of the 01 integration is given by [11] Om=tan -1 (D/4f).…”

Section: A Physical-optics Integrationmentioning

confidence: 99%

“…Note that the summations truncate at n = 2 which is in contrast to the case of the offset parabola [11], [12] where the summations run to n = oo.…”

Section: Poynting Vectormentioning

confidence: 99%

Out-of-Band Response of Reflector Antennas

Hill

1986

IEEE Trans. Electromagn. Compat.

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Abstract-The response of reflector antennas to out-of-band frequencies has been analyzed using physical optics. A simple approximate expression has been obtained for the effective aperture, and this R t expression yields both the receiving pattern and the frequency dependence of the on-axis gain. The theory has been compared with published out-ofband measurements, and the pattern agreement is good, but the measured Index Code-IlOd/e, 16a/e, 113d/e, 114d/e.

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Electric-field distribution in the focal region of an offset paraboloid

Cited by 17 publications

References 2 publications

Optimization procedure for wideband matched feed design

Optimization procedure for wideband matched feed design

Cross-Polarization Cancellation in an Offset Parabolic Reflector Antenna Using a Corrugated Matched Feed

Out-of-Band Response of Reflector Antennas

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