Analytical solution for early-time transient radiation from pulse-excited parabolic reflector antennas

Chou, Hsi‐Tseng; Pathak, P. H.; Rousseau, P.R.

doi:10.1109/8.575632

Cited by 42 publications

(24 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1), the electric field radiated by the focal feed in the absence of a paraboloidal reflector antenna is [7] (1)…”

Section: Background Knowledgementioning

confidence: 99%

“…1). The reflected electric field in the plane that corresponds to the physical aperture of the paraboloidal reflector is given within the GO approximation in [7], which neglects edge scattering (4) with (5) where is the dyadic reflection coefficient, and is the distance from to aperture plane . The electric field due to the feed is a spherical wave, and the field intensity is inversely proportional to .…”

Section: Background Knowledgementioning

confidence: 99%

See 1 more Smart Citation

Optimum Focal Point of a Paraboloidal Reflector Antenna With an Omnidirectional Radiative Source

Chin

Yeom

Ryu

et al. 2013

Antennas Wirel. Propag. Lett.

View full text Add to dashboard Cite

A paraboloidal reflector antenna is useful for enhancing the directivity of a feed antenna with a low directivity. In this letter, we investigate a paraboloidal reflector antenna that has an ultrawideband (UWB) omnidirectional radiative source as the focal feed. To obtain the optimized focal length for a given diameter of the paraboloidal reflector antenna, we employ a simple relation between and , which can reduce the spreading loss of the source field while maintaining the aperture field uniformity. Simulation results show that the values obtained from the above relation can maximize the far voltage-a well-known figure of merit for UWB applications.Index Terms-Electromagnetic pulse (EMP), far voltage, integrated antenna-source (IAS) system, time domain, ultrawideband (UWB).

show abstract

“…1), the electric field radiated by the focal feed in the absence of a paraboloidal reflector antenna is [7] (1)…”

Section: Background Knowledgementioning

confidence: 99%

Section: Background Knowledgementioning

confidence: 99%

Optimum Focal Point of a Paraboloidal Reflector Antenna With an Omnidirectional Radiative Source

Chin

Yeom

Ryu

et al. 2013

Antennas Wirel. Propag. Lett.

View full text Add to dashboard Cite

show abstract

“…In addition to conventional time-domain (TD) numerical analysis techniques such as finite-difference time-domain (FDTD) and TD integral approaches, which are computationally inefficient for the analysis of large antennas, analytical solution is more desired because it provides physical appealing interpretation of wave phenomena [5,6]. TD-AI [6] is employed in this paper to develop the transient analytic solution for an ellipsoidal reflector antenna. The development first defines an aperture in the front of reflector that has a uniform phase distribution of equivalent currents determined by using an approximation of Geometrical Optics (GO) ray tracing techniques.…”

Section: Introductionmentioning

confidence: 99%

Time domain analysis for ellipsoidal reflector antennas illuminated by a cosine-tapered and transient-step feed's radiation

Tuan

Chou

2011

IEEE iWEM2011

View full text Add to dashboard Cite

A time-domain (TD) analysis of ellipsoidal reflector antennas is presented to predict the transient scattered fields when it is illuminated by a cosine-tapered and transient-step feed radiation whose phase center is located at the nearby focus. A transient-step function of the feed's radiation is considered because it will produce an impulsive response near the second focus of the reflector as interested in the applications of impulse-radiating antennas. This TD solution is in a closed form and remains valid both near and far from the reflector, and can be used via the convolution theorem to efficiently obtain the early time transient fields generated by the same ellipsoidal reflector antenna when it is illuminated by a realistic finite-energy pulse which emanates as a spherical wave from the focus. Numerical results are presented for the transient fields both near and far from the reflector. I. INTRODUCTIONIn this paper we present an early-time transient analysis of electromagnetic (EM) radiation of a perfectly conducting ellipsoidal reflector antenna which is fed by a spherical wave radiated from a feed with a cosine-tapered pattern and a transient time-step response. A transient-step response of the feed's radiation is considered because it will produce an impulsive response near the second focus of the ellipsoidal reflector, which is very interested in the applications of impulseradiating antennas. This TD solution is in a closed form and remains valid both near and far from the reflector, and can be used via the convolution theorem to efficiently obtain the early time transient fields generated by the same ellipsoidal reflector antenna when it is illuminated by a realistic finite-energy pulse which emanates as a spherical wave from the focus. In particular, we assumed that the reflector is perfectly conducting and the illuminating feed's radiation has a cosine-tapered pattern and a transient time-step response. This work is motivated by the needs of transient EM analysis in the booming applications of ultra-wideband or short-pulse antenna systems for target identification and remote sensing such as in the design of impulse-radiating antennas (IRA) [1]. An ellipsoidal reflector antenna is considered here because it has been widely used as the subreflector of Gregorian dual-reflector antenna system. Recently it has also attracted great attention in the applications of near-field focused radiations for RFID [2], the detections of vital signal and underground objects [3], or noncontact microwave inspection system [4] because of its nature to focus scattering field in the near zone of antenna. Furthermore, an ellipsoidal reflector will reduce to

show abstract

“…Conversely, a spherical wave generated by a point source placed in the focus can be transformed into a plane wave propagating as a collimated beam along the axis. It is quite useful in antenna designs [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Designing planar electromagnetic wave reflectors through transformation optics

Xiong

Feng

Jiang

et al. 2012

2012 International Workshop on Metamaterials (Meta)

View full text Add to dashboard Cite

In this paper, we present the design of two kinds of low-profile planar electromagnetic wave reflectors based on the transformation optics. By employing simple linear coordinate transformations, the planar reflectors can be achieved with dielectric cover constructed with homogeneous birefringent dielectric media, which reduces the complexity of practical realization. The proposed designs have been validated by full wave electromagnetic simulations. We believe the proposed design may be appliced to other reflectors with planar or low-profile features.

show abstract

Analytical solution for early-time transient radiation from pulse-excited parabolic reflector antennas

Cited by 42 publications

References 8 publications

Optimum Focal Point of a Paraboloidal Reflector Antenna With an Omnidirectional Radiative Source

Optimum Focal Point of a Paraboloidal Reflector Antenna With an Omnidirectional Radiative Source

Time domain analysis for ellipsoidal reflector antennas illuminated by a cosine-tapered and transient-step feed's radiation

Designing planar electromagnetic wave reflectors through transformation optics

Contact Info

Product

Resources

About