Design and Characteristics of Low-Loss Polarization Grid.
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| Title: | Design and Characteristics of Low-Loss Polarization Grid. |
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| Authors: | Kondo, Akira1, Kagoshima, Kenichi1 |
| Source: | Electronics & Communications in Japan, Part 1: Communications. Dec89, Vol. 72 Issue 12, p69-78. 10p. |
| Subjects: | Data transmission systems, Digital communications, Broadband communication systems, Laminated materials, Polarization (Electricity), Polarization of electromagnetic waves |
| Abstract: | Polarization diplexing is possible by of a grid plate and hence a frequency antenna can be realized. Usually, the characteristics of a grid plate can be evaluated by an analysis based on an equivalent circuit. However, for a practical grid with a support mechanism made of dielectric or honeycomb structures, the reflection level of the unwanted polarization at the time for transmission of the desired wave is larger than the value for the metal grid only and hence the results are different from those by the equivalent circuit analysis. In this paper, the characteristics of the grid with a dielectric support layer are analyzed by means of full-wave analysis so that the relationship between the thickness of the dielectric support layer and the reflection level of the unwanted polarization is detected. Next, a method is proposed for suppression of this unwanted polarization in a grid with a dielectric support layer. The validity was confirmed by theoretical analysis and experiments. Further, the design method and the numerical results are presented for a low-loss polarization diplexing grid used in a frequency reuse antenna. It is pointed out that there exists an optimum parameter that minimizes the insertion loss in the operating bandwidth. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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