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The electrode constitutes the key element of the atom probe (AP) pulse signal generator. The AP parameter Monte Carlo (MC) analysis is introduced. The AP microelectrode is designed with 50-Ω loaded microstrip line centered by via hole. The excitation square wave pulse presents 300-ps duration and 1-kV amplitude. The worst cases of the signal integrity is performed with MC analysis applied to the electrode...
Improvement of atom probe tomography requires the high voltage rectangular short pulses. This typical RF transient pulse must be applied on a sample inside an ultra-high vacuum (UHV) chamber. In this letter, we present a synthesis technique of rectangular pulse signal with full width ns-duration. The pulse signal was injected into the cryogenic analysis chamber through the transmitting system composed...
Radial line helical array antenna is a novel antenna which realizes the directional radiation of circularly polarized high power microwave. This paper put forward a rectangular radial line helical array antenna (subarray), which uses short helical antenna as its radiation element, each helix is excited by the energy coupled by a probe from a radial line waveguide, especially it can be simply assembled...
The High-power radial line helical circular array antenna is a novel antenna developed to realize directional radiation of high-power microwaves. This kind of antenna uses short helical antenna as its radiation element, and uses radial line as its feeding waveguide. New probes that can be fixed directly on the radial waveguide (without the need for medium support) are used to couple energy from the...
Ultrasonic probes which can simultaneously generate and receive two orthogonal polarized shear (S?? and S//) and longitudinal (L) waves in screw shape have been presented. Thick piezoelectric films are directly fabricated onto the heads of such probes as L wave integrated ultrasonic transducers. S?? and S// waves are obtained using mode conversion method. Application of such probes for on-line polymer...
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