00390197 - I379 Short Papers - Measurement of High Pulsed...

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I379 Short Papers Measurement of High Pulsed Microwave Power in Free Space Mindaugas Dagys, Zilvinas Kancleris, Vladislav Orievskij, Rimas SimniSkis. Mats Backstriim, Ulf Thibblin, and Bo Wahlgren Abstract-Resistive power heads connected to horn antennas are used to measure high pulsed microwave power density in free space. With such a unit, pulsed power densities up to 3 MW/m '' have been measured in the S- and X-hands. I. INTKOI)IICTION The electromagnetic environment is an increasing cause for con- cern as strong electric fields are becoming a pervasive part of it. Furthermore, there are projects to use microwave directed-energy weapons to disable or destroy enemy electronic systems [I]. System design must take all this into account due to increasing sensitivity of electronic equipment as well as growing dependence on it for our safety. It is therefore of great importance that systems such as aircraft or satellites be tested to withstand electromagnetic threats. Special test facilities generating short, high-power microwave pulses have been developed for this purpose [2]. In testing the electric field strength or RF power density must be measured at the actual location of the equipment of risk. Since the peak power density level produced by the above mentioned pulse sources is of the order of a few MWIm' [2], the standard commercial electric-field probes. limited to detecting a few kW/m' [3], [4], are of little use. A most promising device for such measurements is the resisti\e power head using n-type Si for the sensor manufacturing 151. The principal advantages requirements of such a sensor, a5 contrasted with Schottky or point-contact diodes also used to measure microwave pulse power. are: 1) the ability to measure high RF pulse power directly in the transmission line without directional couplers or attenuator\; 2) a large available output signal (up to a few tens of volts) from the sensor: 3) high reliability and overload endurance, as is characteristic of a resistive sensor: and 4) the ability io switch off the resistive sensor's DC supply in order to assess any parasitic signal that might be induced in the measurement circuit by external electromagnetic fields. This paper demonstrates the successful use of a resistive power head with matched load connected to a horn antenna to measure high microwave pulse power density in free space.
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This note was uploaded on 06/07/2011 for the course EE 11 taught by Professor D during the Spring '11 term at Central Lancashire.

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00390197 - I379 Short Papers - Measurement of High Pulsed...

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