A new type of wide beamwidth antenna is proposed for mobile satellite communication systems. The microstrip crossed slot antenna consisting of four shorted quarter wave elements is one of the antenna elements of wide beamwidth. To widen the beamwidth still further, the antenna installed on a pyramidal ground plane is presented in this letter. The radiation pattern of this antenna is also measured and discussed.

A method is proposed to detect the surface wave propagation direction on the outer conductors of the transmission lines in cable systems, by means of a probe having a property of a directional coupler.

COMOS Overtone Crystal Oscillator Circuit can be obtained, by adjusting the value of the gate-drain external resistor. A method of adjusting the value of the extermal resistor is presented.