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First introduced the theory of PLL, analyzed the factors in the multi-PLL system that may affect the isolation. Then employing EMC theory analyzed and designed the multi-PLL system. At the end, presented the results of isolation measurements. The methods used in the design are especially useful and helpful for the design of multi-channel receiver.
In this paper, a novel frequency selective surface (FSS) using random distribution method is investigated. This FSS can diffuse the reflected wave analogy to array antenna. The reflectivity of three-layer stacked cross patches are studied at first. Then an array of 20×20 FSS is constructed and simulated. Finally a 300mmx300mm three-layer random… (More)