Resistive Sensors for High Pulse Power Microwave Measurements

Microwave pulsed high power measurement in a free space making use of resistive sensors

“…If the longitudinal axis of the horn antenna is adjusted to be parallel to the mw power flux, the mw power getting into waveguide P can be obtained from the following expression P=Wp11s' (1) where Wp is the mw power flow density (Pounting's vector) in a free space, 1 is the efficiency and S is the cross-sectional area of the horn antenna. We have measured the mw pulse power P getting into waveguide when the receiving horn antenna is placed at a distance L from the transmitting one.…”

“…As it was shown by Baltusis et al (1), one of the most perspective devices for high microwave pulsed power measurement are resistive heads, where a resistive sensor made from n-type Si is used as a sensitive element. The performance of the resistive sensor is based on the semiconductor resistance change due to the electron heating effect.…”

Interaction of semiconductor sample with TE₁₀ mode in double ridged waveguide

“…The sample is inserted in the centre of the double ridged waveguide and covers the gap region of it. It is analogous to the crosswaveguide type RS in a rectangular waveguide demonstrating high sensitivity and flat frequency response [2]. These facts stimulated our investigations with a purpose to find a more acceptable layout of the SE for the measurement of microwave pulse power propagating in a double ridged waveguide.…”

“…The power flow in the waveguide at finite frequency can be expressed in terms of the power flow at infinite frequency: (2) where λ is the wavelength of electromagnetic wave in free space. As it was shown in [12] P ∞ can be expressed as follows: (3) where E 0 is an amplitude of electric field in the centre of the empty waveguide, Z 0 is an impedance of free space, and the rest parameters in Eq.…”

“…Several types of RSs with a flat frequency response in the rectangular waveguide have been designed and realised: the cross-waveguide type RS with the SE the height of which is equal to the narrow wall of the waveguide [2], the RS with a diaphragm where the SE is placed between a thin metal foil and the wide wall of the waveguide [3,4], and the RS with two sensing elements the height of which is much less than the narrow wall of the waveguide [5,6]. The main disadvantage of the waveguide type RS is a narrow frequency range where the particular sensor can be used.…”