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A calibration method is proposed for a range finder with a six-port phase frequency discriminator. Calibration equations are derived that include phase errors resulting from both the imperfections in a six-port network and the different diode characteristics. The equations allow a simple and accurate calibration of the range finder with the six-port network. Calibration parameters are calculated from dc outputs, which are measured as the output frequency is varied. The maximum error of a distance measurement from 0.5 to 3 m is 2%.

A 6-GHz-to-18-GHz monolithic nonuniform distributed power amplifier has been designed using the load modulation of increased series gate capacitance. This amplifier was implemented using a 0.25-lm AlGaN/GaN HEMT process on a SiC substrate. With the proposed load modulation, we enhanced the amplifier's simulated performance by 4.8 dB in output power, and by 13.1% in power-added efficiency (PAE) at the upper limit of the bandwidth, compared with an amplifier with uniform gate coupling capacitors. Under the pulse-mode condition of a 100-ls pulse period and a 10% duty cycle, the fabricated power amplifier showed a saturated output power of 39.5 dBm (9 W) to 40.4 dBm (11 W) with an associated PAE of 17% to 22%, and input/output return losses of more than 10 dB within 6 GHz to 18 GHz.

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