Directivity optimization of a reflector antenna with cluster feeds: A closed-form solution

Lam, P.; Lee, Shung-Wu; Chang, Dau‐Chyrh; Lang, K.

doi:10.1109/tap.1985.1143516

Cited by 70 publications

(15 citation statements)

References 18 publications

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“…The sidelobe level for the 80=8" position is increased considerably (from -31 dB to -13 dB). This problem may be alleviated by using the cluster compensation method [10,12,14], and needs to be studied.…”

Section: Discussionmentioning

confidence: 99%

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A comparison of reflector antenna designs for wide‐angle scanning

Zimmerman

Lee

Houshmand

et al. 1990

Micro & Optical Tech Letters

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Conventional reflector antennas are typically designed for up to S O beamwidths scan. In this paper we try to stretch this scan range to some +300 beamwidths. We compare six single and dual reflector antennas. It is found that a symmetrical parabolic reflector with f/D=2 and a single circular waveguide feed has the minimum scan loss (only 0.6 dB at 80=8", or a 114 beamwidths scan). The scan is achieved by tilting the parabolic refletor by an angle equal to the half-scan angle. The f/D may be shortened if a cluster 7 to 19 elements instead of one element is used for the feed. The cluster excitation is adjusted for each new beam scan direction to compensate for the imperfect field distribution over the reflector aperture. The antenna can be folded into a Cassegrain configuration except that, due to spillover and blockage considerations, the amount of folding achievable is small.

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Section: Discussionmentioning

confidence: 99%

“…(ii) ODtimum Directivity [12]. For a feed cluster with prescribed primary patterns and element locations, the directivity in direction 00 is optimized by choosing -where A is a N x N square matrix with elements…”

mentioning

confidence: 99%

A comparison of reflector antenna designs for wide‐angle scanning

Zimmerman

Lee

Houshmand

et al. 1990

Micro & Optical Tech Letters

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“…Generally there are three methods to design element excitation of phased array feeds: the Conjugate Field Matching ( CFM ) method, the Optimum Directivity ( OD ) method [1], Conjugate Gradient Method ( CGM ) [2] and Phase Only Gradient Method ( POGS ) [3]. The phased array feeds designed by these methods can greatly improve reflector's beam electronically scanning performance.…”

Section: Introductionmentioning

confidence: 99%

Quantum particle swarm optimization for integer programming of phased array feeds

Shi¹,

Zhang

Du³

2010

2010 International Conference on Microwave and Millimeter Wave Technology

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This paper studies pattern optimization of an offset parabolic reflector antenna with phased array feeds. Considering quantization requirements, to solve optimum weight vector of phased array feeds can be modeled as integer programming problem, which is optimized with the quantum particle swarm optimization ( QPSO ) algorithm. The optimization with QPSO to determine the quantized element weights is found to yield excellent performance of an offset parabolic reflector antenna, with limited beam electronically scanning and nulling capability. Numerical results of convergence for the QPSO algorithm and the classical particle swarm optimization ( CPSO ) algorithm are shown and discussed.

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“…Once the array geometry is known, only one calculation of the radiating fields is required from each array element in order to maximize the gain in a given direction (design step 2). The optimization become as simple as taking the complex conjugate of the secondary fields resulting from the illumination of the reflector in the given direction by each of the array elements [4]. In order to have a more accurate design, all effects due to mutual coupling and scattering between the elements of the array have to be included.…”

Section: Focal Plane Analysis and Array Designmentioning

confidence: 99%

Design of a focal plane dielectric rod array for feeding a multiple beams reflector antenna

Moumen

Ligthart

IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in Conjunction With: USNC/URSI National Radio

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INTRODUCTIONAt the Delft University of Technology, different radar systems have been developed. One of the larger systems is the S-band Delft Atmospheric Research Radar (DARR), which is used for atmospheric profiling. DARR is a permanent system constructed in an urbanized coastal area. As atmospheric conditions depend on the geographical situation, measurement done at different locations could give extra information on the atmosphere. Therefor, At IRCTR a new transportable atmospheric radar system (TARA) [l], having a sophisticated antenna system, is under construction. The antenna system of TARA has multiple beams pointing at different directions (i.e. Oo, 15' in both horizontaland vertical-plane) and switched electronically. This is achieved by means of a parabolic reflector fed by a small phased array located in the focal region. The Focal plane method [2] was used to select the appropriate location and excitations of each individual element of the phased array. It has been found that, in order to form a beam at 0' one element placed at the focus of the parabolic reflector is sufficient. However, for each 15' beam, an array consisting of two elements, separated by 0.771, where 1 stands for the wavelength, is needed to achieve the required performance. The dielectric rod antenna can be used as feed array element because it can produce a relatively high gain with a small cross-section, due to its dielectric filling and extension, so that feed elements can be packed close together. This makes it possible to design arrays with relative spacing of (0.5

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Directivity optimization of a reflector antenna with cluster feeds: A closed-form solution

Cited by 70 publications

References 18 publications

A comparison of reflector antenna designs for wide‐angle scanning

A comparison of reflector antenna designs for wide‐angle scanning

Quantum particle swarm optimization for integer programming of phased array feeds

Design of a focal plane dielectric rod array for feeding a multiple beams reflector antenna

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