A compact V-band GaAs MMIC chip set consisting of (1) a single highly integrated receiver MMIC with 6.5 dB NF and 2 dB conversion gain using a subharmonically pumped mixer and (2) a transmitter MMIC having a state-of-the-art 30-60 GHz doubler with 14.3 dB maximum conversion gain, 17.7 dBm output power and broadband RF characteristics has been successfully… (More)
A vertebral hemangioma with dural compression and neurological deficit is rare. We report a symptomatic lumbar vertebral hemangioma which was successfully managed with total spondylectomy. The patient was a 31-year-old man whose chief complaint was low back pain. He had a slight sensory disturbance in the right thigh. Plain radiography and magnetic… (More)
We have proposed and developed electro-optic modulators using array-antenna-electrodes for the conversion of millimeter-wave wireless signals to optical signals in radio-overfiber systems. In this report, wireless signal conversion and discrimination in the 60 GHz band are presented.
Cervical vertebral involvement of clear cell meningioma is very rare. We report a case of clear cell meningioma in the cervical vertebral body in a 72-year old male. Seven years prior to this presentation, the patient underwent palliative surgery and posterior instrumentation for a cervical vertebral tumor at C5, which had been diagnosed as a metastatic… (More)