I. Nakajima, Y. Tomioka, H. Juzoji, T. Kitano, L. Androuchko
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A method for applying a Ku-band device to the S-band
Most devices recently used in communications satellite Low Noise Amplifiers (LNA) have been designed and manufactured for use at 12 GHz (Noise Figure [NF] = 0.2 at 12 GHz), the frequency of broadcasting satellites (BS). Designed for use with the Ku-band, the internal wiring of the components is too thin for the S-band, and presents the prospect of large input impedance values. Generally, if we manufacture 2 GHz LNA for testing, NF will degrade at least 1 dB to NF = 1.2 (in the old notation method of NF, 2.2 dB). In this paper, we will report on an improved method for a wearable terminal with a low part count. With our methods, the LNA and the patch antenna, which we manufactured for the test, exhibited a confirmed improvement of 0.6 dB as a relative value, compared to power matching due to the S-parameter (including the stub circuit).
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