Abstract: In a semiconductor device such as a high-frequency power amplifier module, a plurality of amplifying means are formed on a semiconductor chip which is mounted on a main surface of a wiring substrate, and electrodes of the semiconductor chip are electrically connected by wires to electrodes of the wiring substrate. In order to make the high-frequency power amplifier module small in size, a substrate-side bonding electrode electrically connected to a wire set at a fixed reference electric potential is place at a location farther from a side of the semiconductor chip than a substrate-side output electrode electrically connected to an output wire. A substrate-side input electrode electrically connected to an input wire is located at a distance from the side of the semiconductor chip about equal to the distance from the side of the semiconductor chip to the substrate-side output electrode, or at a location farther from the side of the semiconductor chip than the substrate-side bonding electrode is.

Abstract: A power combiner having a plurality of power amplifiers which are even-numbered, a plurality of series-connected branch circuits for respectively distributing input power to the plurality of power amplifiers, and a plurality of series-connected combiners for combining the respective output power of the plurality of power amplifiers. In the case of any one of such combinations as to equalize electric lengths of transmission lines for connecting between two power amplifiers selected from the plurality of power amplifiers, the combinations each being established by using all of the plurality of power amplifiers once, the electric lengths at which the any one of the combinations are established, take &lgr;/2i (where &lgr;=wavelength of fundamental wave, and i=positive integer).

Abstract: A high-frequency transmitter-receiver apparatus includes a transceiver circuit realized in a planar structure by a dielectric substrate and a semiconductor chip and a planar antenna formed on a dielectric substrate are provided on front and rear surfaces, respectively, of a single electrically conductive base plate. Signal lines of the planar circuit and the planar antenna are electrically interconnected by a coaxial line which extends through said base plate.

Abstract: A travelling wave power combiner ensures high isolation between power amplifiers and reduces harmonic components caused by non-linearity of each power amplifier. Therefore, the travelling wave power circuit is provided with even-numbered power amplifiers, a plurality of series-connected branch circuits for respectively distributing input power to the even-numbered power amplifiers, and a plurality of series-connected combiners for combining respective output power of the even-numbered power amplifiers. With respect to all of such combinations as to equalize electric lengths of transmission lines for connecting between the power amplifiers to one another, which combinations are established for the plurality of power amplifiers, the electric lengths at which the combinations are established, take &lgr;/2i (where &lgr;=the wavelength of a fundamental wave, and i=positive integer).

Abstract: An improved feedforward amplifier capable of enhancing accuracy of extraction of an error signal corresponding to a distortion component while preventing outflow of an pilot signal. A switch is disposed between a pilot signal oscillator and a third power combiner for superimposing the pilot signal on an output signal from a main amplifier, and third control means is connected with the switch so that the switch is opened at the time of error signal extraction and closed at the time of error signal elimination.

Abstract: A high-frequency power amplifier comprises a pair of FETs, a divider which supplies opposite-phase versions of a signal to be amplified to the FETs, distributed-parameter transmission lines connected respectively at one ends thereof to output electrodes of the FETs, and a combiner which combines signals appearing at another ends of the transmission lines into a signal of a common phase. Stubs which short-circuit for even harmonics included in output signals of the FETs are connected respectively to the transmission lines at positions distant from the output electrodes of the FETs by a multiple of a quarter wavelength of the fundamental wave included in the output signals of the FETs.

Abstract: A light source apparatus for irradiating a large area with high intensity of light comprises a microwave cavity having a section of a flat shape and a plurality of electrodeless lamps disposed within the cavity in juxtaposition with one another in a flat array.

Abstract: Disclosed is a microwave solid-state amplifier arranged such that a plurality of amplifier units are used in combination of a radial cavity resonator so as to perform power dividing/combining, and that in order to make the microwave solid-state amplifier capable of performing a wide band operation and have less circuit loss, a coupling portion between the radial cavity resonator and each of the amplifier units is formed such that a loop-like conductor constituted by a stripline forming an input/output portion of the amplifier unit is removably inserted through a slot formed in a side wall surface of the cavity resonator.

Abstract: In a camera having a film transport mechanism for advancing and rewinding film and a counter for counting the number of frames of film advanced, a first control device operatively coupled to the counter controls the transport mechanism so as to prevent further film advancement upon the counter reaching a predetermined count. Upon the transport mechanism being operated to rewind the film, a second control device automatically disables the first control device so as to enable further film advancement by the transport mechanism.

Abstract: A ground-vehicle-speed signal processing circuit for a skid control device is disclosed in which, when one or more pulses are dropped from a vehicle-speed signal detected by a Doppler radar vehicle speed sensor, the vehicle-speed output voltage is decreased in accordance with the deceleration just prior to the moment when the pulses are dropped, which is stored in a memory device, to generate a vehicle-speed signal having compensated appropriately the missing part in the detected signal.

Abstract: A vehicle speed sensing device comprises a Doppler radar unit for producing a Doppler signal related to the vehicle speed and producing a speed signal from the Doppler signal, a first section for extracting noise components in the Doppler signal and producing a noise detection signal, and a second section for producing an output signal of the vehicle sensing device. The device output is the speed signal from the Doppler radar unit when the noise detection signal is absent while the device output is null or a speed signal having an amplitude identical with that of the speed signal just before the appearance of the noise detection signal when the noise detection signal is present.

Abstract: A Doppler radar wherein, in order to measure the ground speed of an automobile, microwaves are radiated to the ground and the Doppler shift of reflected waves from the ground is detected, characterized in that to the end of avoiding a malfunction ascribable to an external microwave interference, when the differentiated output of the Doppler radar is greater than a threshold value, the frequency of the microwaves of the Doppler radar is controlled so as to prevent the microwave interference from taking place.

Abstract: A Doppler radar speed sensor including an antenna section and a sensor section is mounted on the underside of the automobile undercarriage. A recess for accommodating the Doppler radar speed sensor is formed in part of the underside of the automobile undercarriage within a rectangle surrounded by the wheels, and the Doppler radar speed sensor is mounted fully within the recess. This structure prevents the sensor from being damaged in an unfavorable environment or external vehicle devices from being interfered with by the leakage of the unrequired radar wave. For size reduction, the Doppler radar speed sensor is provided with a metal casing integrated with a slotted waveguide antenna. The slot array of the antenna is formed in one side of the metal casing, so that the metal casing, makes up part of the slot array antenna.

Abstract: An electric rewind device for a camera having a clutch device for causing a sprocket operatively associated with a wind-up mechanism for feeding a roll film wound on a spool in a film magazine to be disconnected from the wind-up mechanism. A rewind coupling capable of being coupled to the spool is driven by a motor to effect film rewind operation and includes a first operating member engageable with the clutch device and movable between a first position for connecting the wind-up mechanism and the sprocket and a second position for breaking the connection between the two.

Abstract: In a Doppler radar system for measuring the velocity of a vehicle, such as an automobile, in order to lessen interference with external electric wave appliances, such as radios and televisions, caused by transmitting microwaves, one of the higher harmonics generated from a mixer diode driven by the fundamental waves of a local oscillator is selected by a filter for transmission and is used as the transmission output wave, whereby the power of the transmission waves is remarkably reduced in comparison with the mixer driving power.

Abstract: A vehicle speed sensing apparatus with means for checking its operation comprises a Doppler radar unit for producing a Doppler signal related to a vehicle speed and producing a speed signal from the Doppler signal, a first section for extracting low frequency components in the Doppler signal and a second section connected with the first section for producing an operation check signal. The extracted low frequency components correspond to vertical motion of the vehicle and are considerably lower than a Doppler signal frequency which corresponds to a minimum vehicle speed. If these low frequency components corresponding to vertical motion are not present, it is an indication that the speed sensing system is not operating properly.

Abstract: A microwave integrated circuit device for use in the transmitting and receiving portion of a Doppler speedometer utilizing microwaves. In order to keep the transmitting power low and the receiving sensibility high, a microwave integrated circuit plate in which a transmitting antenna line and lines for connecting mixer diodes therewith are arranged at right angles is mounted within a rectangular waveguide and in the vicinity of a short-circuit plate of the waveguide in a manner to lie at right angles with the electric field of the waveguide.

Abstract: A microwave integrated circuit device for reception wherein a microwave integrated circuit substrate is mounted on a short-circuited plane of an inner surface of a waveguide, a rectangular groove is provided in the short-circuited plane, and a mixer diode is arranged astride the groove.

Abstract: There is disclosed a microwave integrated circuit device which comprises a waveguide circuit, a short-circuiting member serving as a short-circuiting plane and having a groove in the short-circuiting plane, means for varying the effective dimensions of the groove which have effect on microwave circuit components, a microwave integrated circuit formed on an insulating substrate so disposed as to cover the groove, and a semiconductor element disposed on the microwave integrated circuit to convert the microwave signal in the waveguide circuit into a selected one of a d.c. and a low-frequency, whereby the conversion efficiency may be increased by setting the peak position of the output level characteristic of the device at a desired frequency within a certain frequency band.