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Microwave ovens are widely used for research purposes, many times incorrectly. Understanding how the microwave power is controlled will give the researcher insight into the experimental results obtained. Microwave power resolution and system time response are the main figures of merit for evaluating the quality of a microwave power controller. A 700 Watt domestic microwave oven was modified using...
Multi-channel receivers often require good phase tracking between channels. If a PIN diode current controlled attenuator (CCA) is needed in each channel, the individual CCAs should track in phase over the full control range. Variations in PIN diode complex impedance as well as component tolerances will cause phase tracking errors in a family of CCAs. A method to compare CCA topologies in terms of...
The unique configuration and application of the Active Protection System (APS) radar sensor, developed by Reutech Radar Systems, requires the development of a novel multipath interference model. This paper derives a mathematical model for the effects of specular multipath interference (primarily due to ground reflections) on the received signals of a dual-frequency phase-comparison FMCW radar. Two...
A low phase noise oscillator operating at 9.2 GHz is presented. A cylindrical metal cavity with air as dielectric is used as the resonator. To minimize the phase noise of the oscillator, the resonator must be designed to have a high quality factor (Q-factor). A high Q-factor is obtained by designing the resonator to operate in the TE011 mode. A tuning screw is used to tune the resonant frequency without...
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