Abstract: An burst-type transmission output power control apparatus, includes an open loop formed by variable power driver for amplifying a modulated wave signal, a saturation type high power amplifier and a directional coupler. A closed loop is constructed by a variable attenuator, connected to the directional coupler, a detector and a relative error amplifier connected to the saturation type high power amplifier. A voltage converter supplies a power supply voltage to the saturation type high power amplifier so that a saturation output of the saturation type high power amplifier is raised for a period at least before and after a steady-state burst waveform, including rising and falling time periods.

Abstract: Disclosed is a field effect transistor amplifier using a field effect transistor as an amplification device, including a coaxial dielectric resonance device inserted between the input terminal of the amplifier and the input terminal of the amplification device and having a .lambda./2 electrical length and a characteristic impedance lower than the input-side impedance at the input terminal.

Abstract: A high-frequency amplifier has a transistor having a transistor input terminal, a transistor output terminal, and ground radiation fins, a first dielectric board having a transistor input matching circuit, and a second dielectric board having a transistor output matching circuit. The transistor is mounted by bringing the ground radiation fins into tight contact with a common ground surface member. The first and second dielectric boards being mounted on the common ground surface member. The first and second dielectric boards are respectively formed with first and second ground conductors on common ground surface member sides thereof. The transistor input terminal and the transistor input matching circuit are connected to each other and so are the transistor output terminal and the transistor output matching circuit.