A Reflection Type of MSW Signal-to-Noise Enhancer in the 400-MHz Band

Takao KUKI  Toshihiro NOMOTO  

IEICE TRANSACTIONS on Electronics   Vol.E82-C   No.4   pp.654-658
Publication Date: 1999/04/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwave and Millimeter Wave Technology
magnetostatic wave,  signal-to-noise enhancer,  noise reduction,  yttrium iron garnet,  direct broadcasting satellite,  

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We have investigated the operation of a reflection type magnetostatic wave signal-to-noise enhancer in detail. It has good enhancement characteristics, low insertion loss, and low operating power. It is also composed of a transducer using a ceramic substrate having a high dielectric constant and an LaGa-YIG film with low saturation magnetization to enable direct operation in the 400-MHz band (the IF band of current DBS receivers). Enhancement of 8 dB was achieved over a 40-MHz bandwidth. Although its operating frequency range depends critically on device temperature, we can compensate for the temperature dependence by adjusting the bias magnetic field. Experiments showed that the enhancer improved the received carrier-to-noise ratio by 2 to 3 dB, providing good noise reduction in DBS reception.