Design aspects and tolerances in array fed contour beam antennas of INTELSAT VI type

Parini, C.G.; Brain, D.J.; Kalatizadeh, Y.; Olver, A.D.; Raghavan, K.

doi:10.1049/ip-h-2.1988.0085

Cited by 4 publications

(2 citation statements)

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“…The asymmetric co-polar pattern resulting from exciting an edge element in the array is also well predicted as shown in figure 8. The importance of being able to accurately predict the co-polar and cross-polar radiation from an array in the design of array fed multibeam spacecraft antennas has been recently reported [7].…”

Section: Arrayeb Lattlce Gej Meirymentioning

confidence: 99%

The Importance of Mutual Coupling in the Analysis of Finite Arrays of Rectangular Apertures

Parini

Kitchener

1989

19th European Microwave Conference, 1989

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The paper describes the theoretical analysis of the radiation characteristics of a finite array of rectangular horn apertures including the effects of mutual coupling. Results are presented for a square array of 25 elements demonstrating the importance of the mutual coupling effect. The effect on the radiation characteristics of using different array lattice geometries and the ability of the theory to predict blind spot angles in finite arrays is also shown. Experimental results confnmning the predictions are presented. LNIRQDUCTlIOArrays are now widely used in the fields of radar and telecommunications antennas because of the considerable versatility in the control of the antenna radiation characteristics that they offer. However, the design of an array antenna is complicated by the mutual interactions that occur between the radiating elements. This effect is termed mutual coupling and neglecting it in the theoretical analysis of an array can lead to errors in predicting such parameters as the levels and distribution of radiated cross-polar power, the embedded element co-polar radiation patterns, and the embedded element input impedance.Many antennas use rectangular array elements because of the versatile stacking geometry and the improved aperture efficiency they offer. This is particularly true in the field of radar antennas. Only with the availability of accurate array analysis, based on mutual coupling effects, can realistic studies be made of some of the key radiation properties of radar arrays. For example the use of a full mutual coupling analysis would permit the accurate prediction of embedded element pattern nulls. It is important to know the position of these nulls since they lead to blind spots in radar coverage. It is clear that the recent advances in the area of adaptive antennas will only be fully exploitable in the near future if accurate radiation characteristics of the array can be predicted. For example, such analysis would permit the choice of optimum sub-array geometry permitting clusters of array elements to be combined to form the currenfly limited number of adaptive channels. In this paper we describe the analysis of the mutual coupling in finite arrays of rectangular apertures leading to an accurate model for the prediction of the radiation characteristics of these structures. THEORETICAL ANALYSISThe elementary theory of arrays separates the array factor and element factor in the expression for the array radiation pattern. However, mutual coupling between the elements causes the element factor to change and become dependent on the element spacing and its precise location within the array. The analysis of mutual coupling in a finite planar array of rectangular apertures embedded in an infinite ground plane follows on from the successful study performed at Queen Mary College for the case of circular apertures [1]. In practice the infinite ground plane approximation is not restrictive if the ground plane exists to half a wavelength past the outer active elements. This is because the pattern...

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Section: Arrayeb Lattlce Gej Meirymentioning

confidence: 99%

The Importance of Mutual Coupling in the Analysis of Finite Arrays of Rectangular Apertures

Parini

Kitchener

1989

19th European Microwave Conference, 1989

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“…The contoured beam fits the shape of the desired coverage region and reduces wasted transmitted power by minimizing the illumination of the areas of no interest [1]. To produce the contoured beam, the two most popular designs are array-feed reflector [2,3] and planar phased-array [4]. However, owing to the increasing cost of the feed array and the complexity of beam forming network, a single-fed reflector antenna has been an active research area because of its simplicity [5,6].…”

Section: Introductionmentioning

confidence: 99%

Gradient-based optimization method for producing a contoured beam with single-fed reflector antenna

Lian

Wang

Xiang

et al. 2019

Journal of Systems Engineering and Electronics

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A gradient-based optimization method for producing a contoured beam by using a single-fed reflector antenna is presented. First, a quick and accurate pattern approximation formula based on physical optics (PO) is adopted to calculate the gradients of the directivity with respect to reflector's nodal displacements. Because the approximation formula is a linear function of nodal displacements, the gradient can be easily derived. Then, the method of the steepest descent is adopted, and an optimization iteration procedure is proposed. The iteration procedure includes two loops: an inner loop and an outer loop. In the inner loop, the gradient and pattern are calculated by matrix operation, which is very fast by using the pre-calculated data in the outer loop. In the outer loop, the ideal terms used in the inner loop to calculate the gradient and pattern are updated, and the real pattern is calculated by the PO method. Due to the high approximation accuracy, when the outer loop is performed once, the inner loop can be performed many times, which will save much time because the integration is replaced by matrix operation. In the end, a contoured beam covering the continental United States (CONUS) is designed, and simulation results show the effectiveness of the proposed algorithm.

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Generating Contoured Beams for Malaysia Region by Using a Caustic Locus Graph [Antenna Applications Corner]

Rahman

Islam

Misran

et al. 2014

IEEE Antennas Propag. Mag.

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Design aspects and tolerances in array fed contour beam antennas of INTELSAT VI type

Cited by 4 publications

References 0 publications

The Importance of Mutual Coupling in the Analysis of Finite Arrays of Rectangular Apertures

The Importance of Mutual Coupling in the Analysis of Finite Arrays of Rectangular Apertures

Gradient-based optimization method for producing a contoured beam with single-fed reflector antenna

Generating Contoured Beams for Malaysia Region by Using a Caustic Locus Graph [Antenna Applications Corner]

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