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Paying attention to the sound of breaking sea bottom depending on the magnitude of TSUNAMI, we examined the acquisition of a sea sound wave at Japan waters. We considered the traveling route of the sea sound wave radiated from the hypocenter of the Tohoku-Pacific Ocean Earthquake, and estimated the propagation loss, which has a characteristic that the diffusion loss depending on distance is dominant...
We developed a coaxial-type fixture for precisely measurement of the impedance characteristics of small surface-mounted quartz crystal units. This fixture is applicable to the one-port S-parameter reflection method proposed in IEC60444–5, and measures the frequency impedance characteristics of a device under test (DUT) from its reflection coefficients. This measurement fixture uses a 65 GHz coaxial...
This paper describes improvement of phase noise characteristics of an Fr oscillator. We have examined the configuration of the Fr oscillator, the loaded Q of which is improved by using matching network, and we have predicted the value of the loaded Q. Furthermore, we actually made several configurations of the Fr oscillator and measured the SSB phase noise. We show that the measured loaded Q of the...
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