Interference Reduction Methods for Antennas on Aerospace Vehicles

Lyon, John A. M.; Digenis, Constantine John.; Parker, William Walter

doi:10.1109/isemc.1967.7570014

Cited by 2 publications

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“…Therefore several journal papers have been referenced to extensively validate the present analysis. For example, we have verified the dominant mode coupling given by Borgiotti [5], as well as the coupling between the rotated waveguides given by Lyon et al [20] and Bird and Bateman [21]. The highorder mode coupling given by [8] has also been verified and the results are given in [22].…”

Section: Computations and Resultssupporting

confidence: 77%

Effects of high-order mode coupling in dielectric covered finite array of dissimilar rectangular waveguides

Patel

Bailey²

1997

IEEE Trans. Antennas Propagat.

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Expressions are presented for the computation of mutual admittance between rectangular apertures of different size, in a finite planar array. The equations allow any orientation for any of the apertures, with any number of transverse electric (TE) and transverse magnetic (TM) waveguide modes. Furthermore, the expressions also include the effect of dielectric covering of these apertures. A versatile software package, useful for the design and analysis of finite phased arrays, is produced incorporating these features, and its extensive validation is provided.Index Terms-Finite phased arrays, waveguide arrays.

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Section: Computations and Resultssupporting

confidence: 77%

Effects of high-order mode coupling in dielectric covered finite array of dissimilar rectangular waveguides

Patel

Bailey²

1997

IEEE Trans. Antennas Propagat.

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Improvement of System Compatibility through Coupling Reduction

Lyon

Digenis

Parker

1968

1968 IEEE Electromagnetic Compatibility Symposium Record

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This paper deals with various techniques in the form of modifications or additions which were developed to produce additional coupling reduction in existing systems. Although this has been the prime purpose, due consideration has been given to the effects of the different methods on the original objectives of the systensa Some of the techniques alter the radiation patterns and gains of the antennas involved. Consideration has been given to developing techniques which are operable over a broad band of frequencies in order not to restrict the operational requirements of the systems involved.Both analytical and experimental results are presented. Experiments were performed in convenient microwave frequency bands. However, by proper scaling with respect to frequency, it is possible to use the results given in this paper at other frequencies.One of the methods of coupling reduction described here is the compensating bridge. This bridge is formed with the addition of a cancellation link between two interfering systems. The bridge is balanced by adjusting the amplitude and phase of the power transmitted through the link to obtain high isolation. The distinct achievement here is the reduction of interference between two systems over a broad range of frequencies. This method is one of the most versatile since it can be readily extended to almost any frequency band.The use of corrugations in the form of circumferential trenches around the aperture of an antenna was found to offer a substantial reduction in coupling. The application of these trenches not only decreases the interference between two systems, but also increases the gain of each of the antennas involved. This method has been found successful when applied to slots, monopoles, spirals and horns as shown in the paper.Parasitic linear elements in the form of fences erected on the ground plane between two slot antennas have produced an additional isolation of 35 db over a 25 percent bandwidth. Finally, results are presented showing the possibility of combining different decoupling methods such as the bridge and corrugations to achieve greater system isolation.Quite obviously, many of the results of this paper are immediately applicable to the problem of intra-system interference. It is also believed that the bridge method can be easily applied to inter-system interference,where the systems involved are under the control of the same personnel. IntroductionEarlier work by the authorsl involved the study and acquisition of data dealing with the level of electromagnetic coupling present between two systems. This paper has a different objective. Rather than present information to be incorporated in a mathematical model to evaluate the interference problem between systems, methods to reduce coupling are presented. In approaching the problem of modifying an electromagnetic field situation in order to reduce coupling it is necessary, first of all, to consider the primary objectives of the various systems involved. Emphasis must be placed on the possible effect of different ...

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Interference Reduction Methods for Antennas on Aerospace Vehicles

Cited by 2 publications

References 0 publications

Effects of high-order mode coupling in dielectric covered finite array of dissimilar rectangular waveguides

Effects of high-order mode coupling in dielectric covered finite array of dissimilar rectangular waveguides

Improvement of System Compatibility through Coupling Reduction

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