S Band Narrow Pulse Signal Source Design

In recent years, high-power microwave (HPM) as a new technology and attention.It is an emerging discipline since the1970s with the development of pulsed powertechnology, is the product of the combination of pulsed power technology and plasmaphysics and electric vacuum technology.Possible military and industrial applications,provides the basic impetus for the development of high power microwave disciplines,based on this demand-driven, the HPM research has made rapid development.The relativistic magnetron (RM) is a development of the best high-powercrossed-field devices. Tunable relativistic magnetron experiment system, the test fromRadiation speaker to the receiver horn between the attenuation and the attenuation ofcoaxial cable, you need to using the calibrated microwave source to produce the samefrequency with the mode signal injection, on the other period of peak power meter testpower. When measuring the attenuation of microwave power to take advantage ofdiscounted at the detector sensitivity, the sensitivity of the detector need to use themicrowave source with frequency, pulse width similar to the microwave pulsecalibration. Difficult to achieve a common source of these variable-frequency, pulsewidth adjustable requirements, design an S-band narrow pulse signal source to meet thetest requirements. The pulse source is divided into two major frequency synthesizersand high-speed microwave switch. The frequency synthesizer part of the DDS for thePLL excitation source, you can achieve a very small frequency step; switching part ofthe design to produce a narrow pulse of fast cutting-edge for the purpose of selection ofGaAs high-speed switch. Control functions by the microcontroller to microcontrollerprogram prepared by the chip timing relationships. The signal source has a simplecontrol, the output pulse width narrower to achieve1dB-15dB attenuator controlledthrough the microcontroller continuously adjustable attenuation, each moduleprocessing characteristics of the cavity as a shield.After the test, the output frequency of the pulse signal source for the2.1GHz-3.7GHz, the phase noise is better than-85dBc/Hz@1kHz, the output pulsewidth can reach20ns.