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We discussed the radiation and reception properties of an array antenna with a decoupling and matching feeding network. When the feeding network is designed and constructed to satisfy the matching condition of the array antenna, each port pattern exhibits orthogonal property and eigen mode patterns when the orthonormal matrix, which constitue the sub matrix(More)
Decoupling and matching feeding networks are considerably interested for small wireless terminals to enhance their abilities in the application for MIMO systems. This paper describes various kinds of decoupling and matching feeding networks and derives the formulas for determining the network elements explicitly. Numerical results are presented to ensure(More)
SUMMARY In the phase locked loop (PLL) frequency synthesizer which is used in a higher frequency region, the prescaler method is employed in order to increase the operating frequency of the programmable divider. However, since the fixed divider whose division ratio is same as the prescaler is installed at the following stage of the reference divider, the(More)
In this paper, we propose a new PLL frequency synthesizer utilizing multi-programmable dividers which can attain a higher speed lock-up time. Proposed PLL can increase the loop gain without the increase of reference frequency. Effectiveness of PLL with multi-programmable dividers and multi-phase detectors will be shown by the theoretical considerations and(More)