The recent start of R&D into Wireless Personal Networks (WPAN) and millimeter-wave wireless systems is creating an urgent need for development of a spectrum analyzer supporting accurate measurements in the frequency band above 100 GHz. However, there is no spectrum analyzer with a built-in pre-selector supporting spectrum analysis of wireless signals above 67 GHz. Such measurement is made generally by connecting a harmonic mixer or Block Down converter externally to a spectrum analyzer. In this case, generated unwanted signal components (spurious responses) are often seen during measurement, making it difficult to monitor the original signal components. This paper proposes development of a millimeter-wave spectrum measurement system incorporating a pre-selector function for wide dynamic range measurements with minimum unwanted signal components. We present the results of investigation into a prototype of the proposed system. We also measured a 120 GHz QPSK modulation wave to demonstrate the effectiveness of this system with pre-selector.

This report is regarding to a new measurement of a millimeter-wave using optical power. A calorie meter conventionally has been used to measure the millimeterwave power above 100 GHz, which has high temperature dependence, and therefore finds the difficulty of small power measurement. To overcome this difficulty, we propose the new method to estimate millimeter-wave power by measuring optical power of optical 2-tone signals. This proposed method has low temperature dependence due to optical power, and therefore makes the small power of the above millimeter-wave enable. The principle and the estimation methods of this new method, and its experimental methods and results are explained. Noble results show that the difference between estimated and experiment value is maximally 0.99 dB at 110 GHz, the measurement possibility of frequency extending more than 170 GHz is referred to. C⃝ 2016 Wiley Periodicals, Inc. Electr Eng Jpn, 196(4): 3-10, 2016; Published online in Wiley Online Library (wileyonlinelibrary.com).

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