Abstract: The high frequency circuit includes an oscillator connected in a Colpitts configuration. Negative feedback to the oscillator is applied through an amplifier, both to stabilize the circuit and to permit frequency modulation of the carrier signal generated by the circuit. This feedback incorporates a capacitance to neutralize the Miller effect, thereby enabling it to operate at exceedingly high carrier frequencies. A variation of the circuit permits it to be simultaneously controlled by both a voltage and a current control signal. Also, by applying a frequency modulated carrier signal at a particular node of the oscillator, a demodulated output signal may be obtained.

Abstract: An antenna employing a first capacitor formed by a conductive segment disposed above a ground plane and serially connected adjacent capacitors formed over the ground plane. The adjacent capacitors are connected to the ground plane by tuned circuits, resulting in additive coupling of the E fields across the first and adjacent capacitors and the prevention of E field shunting.

Abstract: A pulse modulation system in which both ends of the pulses of a train can be modulated in time relative to time marker signals, permits establishment of a four-channel, time division, duplex communication system on a single radio frequency carrier. The modulation technique permits pulse width modulation of signals whose band width exceeds the pulse repetition rate.Such a system can provide relatively narrow band, low noise, communication, and it is applicable to transmission and reception of high quality stereo signals. Moreover, it can provide private, secure radio communication between two stations, one of which transmits a train of pulses one edge of each of which is unmodulated to form time marker signals. The formation of the other edge of the pulses of the train is modulated in time with some variable information, or data, but only if the pulse train received from the other station has one edge of its pulses modulated with an identification signal.