Abstract: A low-cost SAW device package comprises a ceramic or glass carrier chip, a SAW device substrate mounted on the carrier chip via a conventional adhesive and a package cover mounted over the SAW device by a glass frit. The glass frit provides a tight vacuum seal for the SAW device so that outside contamination is prevented. The package cover is fabricated of a low-cost nonmetallic, non-single crystalline material (i.e. glass) having thermal characteristics similar to or the same as those of the SAW device substrate. The packaged SAW device is mounted into a circuit or subsystem using conventional bonding techniques.

Abstract: An alpha particle counter for detecting individual alpha particles with a detection medium which is ambient air. Energetic alpha particles from radioactive decay products or other sources enter the detector volume through a durable wire screen window and ionize the ambient air detection medium. Ions of one polarity are driven to the central collector electrode by an electric field due to a battery imposed potential difference between the outer electrode and the central electrode and housing. One pulse is produced for each alpha particle losing its energy in the detector. The counting efficiency is substantially one hundred percent (100%) and is relatively noise free because the collector electrode is essentially at ground potential. The collector electrode signal is amplified in a field effect transistor (FET) emitter follower circuit, the output of which is fed to an external counter. Rugged construction and minimum maintenance are inherent features of this alpha particle detector.

Abstract: A permanent magnet structure comprising a longitudinally extending flux sce fabricated of magnetically rigid material. The flux source comprises a central cavity with a magnetic field being produced therein. Magnetic dipoles having predetermined magnitude and orientation for compensating nonuniformities in the magnetic field are symmetrically located within the plane of the flux source.

Abstract: A cryogenic microwave test chamber consists of a dry-sample receiving char which is partly immersed in liquid nitrogen. Waveguides from either end of the interior of the dry chamber are connected to and sealed to outgoing waveguides in regions immersed in the liquid nitrogen. Dry nitrogen is introduced through the waveguide and is circulated through the dry chamber to prevent condensation therein during cooling. A heat conductive metal tube surrounds the dry chamber and is spaced therefrom and acts as a heat barrier. Waveguide flanges on the opposite ends of the dry chamber slidably seal the chamber.

Abstract: A detector of ambient radon concentrations in real time comprising a housing, at least three conductive elements one of which being grounded, another being biased with respect to the other conductive elements, and at least one other conductive element being connected in series with an amplifier circuit and a counter circuit, respectively. In operation, when an energized alpha particle enters the housing, it ionizes air molecules, thus producing ions which are collected by the conductive element by virtue of the potential between that element and the other elements. The voltage pulse is amplified by the amplifier circuit and then counted.

Abstract: An electrically controlled RF phase shifter having an active medium formed rom a ceramic material the permittivity of which may be varied by varying the strength of an electric field in which it is immersed. The phase shifter includes the ceramic material having electrodes mounted thereon that are connected to an adjustable d-c voltage source. The phase shifter may be placed in an RF transmission line that includes appropriate input and output impedance matching devices such as quarter-wave transformers. The phase of the RF power exiting the phase shifter will depend on the effective electrical length of the material in the active medium. Because changes in the permittivity of the material will produce corresponding changes in the electrical length of the material, changes in the phase of the RF power transmitted therein will be produced. The quarter-wave transformers may also be made of a similar adjustable permittivity material.