Abstract: A microwave circuit package includes a metallic base plate on which are mounted a plurality of monolithic microwave integrated circuits (MMICs) and a spacer, made of a dielectric material, separating the MMICs from each other, and the MMICs and spacer are sealed in the package. The provision of the spacer substantially reduces the volume of the interior space of the package. A dielectric substrate having generally the same height as substrates of the MMICs may also be mounted on the metallic base plate, and a strip conductor may be provided on the dielectric substrate so as to form a microstrip line thereon.

Abstract: An antenna device has a plurality of radar modules having respective integrated circuit boards of transmitter and receiver circuits for transmitting and receiving electromagnetic waves and a common case or respective case members accommodating the integrated circuit boards. The common case or case members have respective primary radiators integrally formed therein. The primary radiators are positioned at the focal point of an offset reflector which is fixedly supported by a holder 10 that also supports the radar modules.

Abstract: A radar module has an antenna assembly, a plurality of transmitting and receiving assemblies, and a plurality of circulators all mounted on a dielectric substrate. The antenna assembly has a plurality of transmitting and receiving channels including respective planar array antenna elements each composed of a plurality of patches connected to and spaced along a linear distal end portion of a feeder line. The planar array antenna elements are arrayed in a direction substantially perpendicular to the linear distal end portion of the feeder line. The transmitting and receiving assemblies, implemented as monolithic microwave integrated circuits, selectively transmit high-frequency signals to the planar array antenna elements and selectively receive echo signals from the planar array antenna elements.

Abstract: A radar device for vehicle use which can be manufactured inexpensively while enhancing its monitoring function for an adjacent object as well as a remote object. The radar device includes a radar module for monitoring an adjacent object having a plurality of adjacent object monitoring antennas, a signal transmitting/receiving section for supplying transmitting signals to the adjacent object monitoring antennas and outputting signals by mixing the transmitting signals with received signals supplied from the adjacent monitoring antennas and a delay circuit inserted between the signal transmitting/receiving section and the adjacent object monitoring antennas. The radar device also includes a module for monitoring a remote object having a remote object monitoring antenna and a signal transmitting/receiving section for supplying transmitting signals to the remote object monitoring antenna and generating signals by mixing the transmitting signals with received signals supplied from the remote monitoring antenna.

Abstract: The radar module comprises a vertical layered block of a planar array antenna, a signal delay section, and a transmitter-receiver section. The planar array antenna comprises: four antenna portions different in beam direction; and a selective connection section for selectively connecting each antenna portion with the signal delay section. Reducing the number of parts, saving the production cost and miniaturizing the apparatus is achieved by an arrangement in which a single transmitter-receiver section is in common use with a plurality of antenna portions. The signal delay section comprises a spiral dielectric line with a metal layer covering around a dielectric of rectangular section to achieve ensuring the delay time and reducing the package area.

Abstract: A time-sharing FM radar system. A plurality of beam radiating and receiving means, an FM signal generating means, a transmitting unit, a receiving unit, and a direction detecting means are configured to minimize power consumption and interference between channels. The beam radiating and receiving means are arranged to radiate partially overlapping beams in space and to receive return beams. The FM signal generating means generates an FM signal. The transmitting unit includes a plurality of transmitting switching circuits each comprised of a plurality of amplifiers. Each amplifier corresponds to one of the beam radiating and receiving means, and is configured to intermittently amplify and distribute a portion of the FM signal generated by the FM signal generating means to its corresponding beam radiating and receiving means. The receiving unit includes a plurality of receiving switching circuits and a single mixer.

Abstract: This invention relates to a semiconductor sensor for detecting external physical forces, such as acceleration, contact pressures, air pressures, mechanical vibrations, etc. The semiconductor sensor according to this invention is characterized by the use of compound semiconductors of high piezoelectricity, such as GaAs, etc. Conventionally sensors of the cantilever type, diaphragm type, etc. are made of silicon. These prior art sensors have low detection sensitivity, and their characteristics tend to deteriorate. The sensor according to this invention is made of GaAs, which has high piezoelectricity and can retain good characteristics of the semiconductor even at high temperatures and includes a field-effect transistor formed on the GaAs for sensing a stress. The FET is driven by a constant current or a constant voltage so as to detect a change of an electrical characteristic (e.g., threshold characteristic) due to a stress.

Abstract: This invention relates to a semiconductor sensor for detecting external physical forces, such as acceleration, contact pressures, air pressures, mechanical vibrations, etc. The semiconductor sensor according to this invention is characterized by the use of compound semiconductors of high piezoelectricity, such as GaAs, etc. Conventionally sensors of the cantilever type, diaphragm type, etc. are made of silicon. These prior art sensors have low detection sensitivity, and their characteristics tend to deteriorate. The sensor according to this invention is made of GaAs, which has high piezoelectricity and can retain good characteristics of the semiconductor even at high temperatures and includes a field-effect transistor formed on the GaAs for sensing a stress. The FET is driven by a constant current or a constant voltage so as to detect a change of an electrical characteristic (e.g., threshold characteristic) due to a stress.

Abstract: In accordance with this invention, there is provided a primer composition prepared by dissolving in an organic solvent at least one diepoxy compound selected from the group consisting of:(1) polyalkylene glycol diglycidyl ether of the formula; ##STR1## (2) poly(alkylene glycol) diglycidyl ether of the formula; ##STR2## and (3) diepoxide derived from a bisphenol of the formula; (wherein R.sub.1 is a linear or branched alkylene group having less than 8 carbon atoms; R.sub.2 is a linear or branched alkyl group having less than 4 carbon atoms, R.sub.3 is a linear or branched alkylene group having less than 8 carbon atoms, or a binding group selected from the class consisting of ##STR3## l, m and n are each an integer of from 0 to less than 10, the sum of l and m being more than 1).Also in accordance with the invention, there is provided a process for producing a coated product using such primer composition.