Abstract: A coaxial transmission line system includes a coaxial transmission line having a center conductor and an outer conductor, and an rf generator. A stub antenna is coupled to the generator, and extends radially into the transmission line between the outer and center conductors for capacitively coupling rf energy from the generator to the center conductor. Input impedance of the coaxial transmission line is matched to the impedance of the antenna and generator by means of a pair of tuning screws that extend radially into the transmission line between the outer and center conductors adjacent to the antenna. The tuning screws are adjustably positionable radially of the center conductor and are spaced from each other lengthwise of the transmission line.

Abstract: An electrohydraulic control system includes an actuator having a cylinder and a piston variably positionable therewithin. An electrohydaulic valve is responsive to valve control signals for coupling the actuator to a source of hydraulic fluid. A coaxial transmission line extends through the actuator, and includes an outer conductor formed by the actuator cylinder and a center conductor operatively coupled to the piston, such that length of the coaxial transmission line is effectively directly determined by position of the piston within the cylinder. An rf generator is coupled to the coaxial transmission line for launching rf energy therewithin, and valve control electronics is responsive to rf energy reflected by the coaxial transmission line for indicating position of the piston within the cylinder and generating electronic control signals to the valve. A second coaxial transmission line of fixed length is connected the valve and actuator so that the hydraulic fluid flows therethrough.

Abstract: A composition for forming a resistive type oxygen sensing element and a method for forming such elements, wherein a mixture of titanium dioxide, glass frit and platinum are used, the titanium dioxide having a particle size within a specific range, and a particular ratio to the other two components of the mixture. The composition is screened over printed platinum leads on a ceramic substrate, with a resistor material also used as a thermistor, and the resistive materials having their own conductive leads in addition to a common lead to the terminals of an oxygen sensor.