Abstract: An antenna matching device has a ferromagnetic core with a balanced shape and composition to each side of a center tap position. Each side of the core has a first and second parallel wound coil, the free end leads of the first coils being connected together, and the center-tap lead of each first coil being connected to that of the corresponding second coil on the opposite side of the core, the free end lead of each second coil being connected to its own antenna terminal.

Abstract: Herein disclosed in a paper sheet counting machine which comprises: position detecting means for detecting that suction tubes are in a stand-by position and in a start position; vacuum pressure detecting means for detecting the vacuum pressure prevailing in the suction tubes; and a control unit for driving and controlling a counter motor, a holder motor and a pump motor in response to signals which are fed from the position detecting means and the vacuum pressure detecting means. When the holder is in an open position, the suction tube is set in the stand-by position. After the holder is set in a closed position, the suction tube is then set in the start position to block and seal its inside from the outside. Then, a vacuum pump is driven so that the counting operations are started when the vacuum pressure in the suction tube reaches a predetermined level.

Abstract: Offset-error included data normally is output from a single ramp analog to digital converter in response to input information applied thereto during light or cuvette sample intervals. During dark sample intervals between the cuvette sample intervals, the input information is blocked from the converter and the converter is operated with the output counter counting down to a dark count representing the offset error of the counter. During the next cuvette sample interval the counter counts up from the dark count effectively subtracting out the offset error introduced by the converter.

Abstract: A thin layer of a non-stick coating having a low coefficient of friction and a low solar reflectivity producing a non-wettable surface is applied to the reflecting face of an inclined dish receiving antenna to prevent the build-up of ice or snow on the reflecting face of the antenna.

Abstract: A multiband aerial, especially suitable for a motor vehicle window, or for application to the window, which comprises a single conductor wire which starts from a signal pickup position, terminating in just the one free end, and which includes the FM aerial section and the AM aerial section, with such sections being connected in series, and therefore not requiring phasing, and being electrically isolated by means of an inductor, preferably of box rib pattern, which inductor can function as an open circuit in the FM band and as a short circuit in the AM band. The series of vertical and horizontal segments, forming the sole aerial conductor wire which contains in series such FM section and AM section, can be of variable, but always asymmetrical, geometry or configuration.

Abstract: A short-focus microwave reflector is located a short distance away from the feed horn and is positioned to reflect the beam of microwave radiation away from the feed axis and toward a large primary reflector antenna for transmission. A conical shield extends from the feed horn to the secondary reflector, joining them together as a unit and preventing sidelobe radiation. The beam of radiation emerges from the shield through an aperture in the sidewall thereof. The short focus of the secondary reflector causes the beam to be focussed approximately at the plane of the aperture, such that the beam diameter is small and the aperture can also be small, reducing stray radiation from the shield structure. Diffraction at the edges of the aperture is reduced by a radially surrounding choke structure which further suppresses sidelobe radiation.

Abstract: A high current low impedance antenna having an electrically short monopole radiation pattern is provided by shielding at least one of the segments or legs of a loop antenna so that the shielded leg has no cancelation effects and thereby produces the uniform radiation pattern of a short monopole antenna.

Abstract: A flat face annular grooved metal surface surrounds a circular waveguide opening coupled to a small dipole radiator which excites the circular waveguide in its fundamental propagating mode (TE.sub.11). The dipole is arranged to rotate about its axis by means of an extension of its inner conductor, which forms a simple probe in a section of rectangular waveguide situated behind the circular waveguide. A dielectric shaft is fastened to the inner conductor and is brought to the outside of the rectangular waveguide where it is connected to a small motor. The motor is arranged so that it may be actuated remotely by any of several circuits. The dipole may be before the corrugated plate with bent arms. A pair of dipoles may be arranged perpendicular to each other with two separate coaxial connector antenna feed outputs for direct attachment to coaxial-type low-noise amplifiers.

Abstract: An antenna for operating over a broadband of frequencies includes an operating radiating elements for radiating radio frequency energy at a selected band of frequencies and a lower radiating element for providing a counter poise to the upper radiating element. An antenna coupler transforms the load impedance of the upper radiating elements and the lower radiating element to a nominal impedance, such as 50 ohms. The coupler element also electronically couples the lower radiating element to the upper radiating element.

Abstract: A dielectric waveguide of rectangular cross-section has periodically spaced, transverse slots in its upper surface. When traveling waves of varying millimeter wavelength frequencies are applied to the waveguide, the slots perturb the waves resulting in radiation having a main lobe that scans as the frequency changes. The antenna is made rigid by the use of a dielectric support.

Abstract: This disclosure is concerned with a linear antenna array mounted on a conductive longitudinal boom, as in a Yagi-type array or the like, having a plurality of assymmetrical transversely extending folded half dipoles and linear extensions thereof disposed at successive longitudinally spaced locations along the boom, with the folded half dipoles of successive antennas extending from opposite sides of said boom.

Abstract: A multiple reflector antenna is disclosed that comprises a main reflector formed of a portion of a rotatively symmetrical surface with respect to a rotation axis, a sub-reflector, at least one auxiliary reflector, and at least one wave source, said rotation axis being parallel to or slightly deviated from an aperture plane. This antenna is characterized by such construction that said sub-reflector and auxiliary reflector intentionally cause distortion of an electro-magnetic field distribution to cancel the distortion generated at said main reflector.

Abstract: A reflector and a method of making a reflector, the reflector having a dished reflecting surface, a series of slot formations, the extended longitudinal axis of each slot formation being curved and radiating from the center area of the reflecting surface and through the outer edge of the reflecting surface, the material of the reflector laterally of the extended longitudinal axes of said slot formations adjacent at least one end of the slot formations being folded adjacent the extended axes of the slot formations.

Abstract: An efficient circuit for coupling at least two radio frequency transmitters of arbitrary power and frequency to one antenna comprises a three-port ferrite circulator connected to the output of each transmitter, a tee connector with a predetermined impedance mismatch connected to the first output port of each circulator, a first in-phase power combiner connected to the second output port of each circulator, and a second in-phase power combiner connected to the outputs of the tee connector and first combiner for adding the RF power and feeding the attached antenna. The impedances of transmission lines connected to the tee connector are selected to present a 3 to 1 voltage standing wave ratio to input lines so that reflected power is equally divided and fed in segments of equal power, phase and amplitude to that of the original summation for recombining and delivery to the antenna. The circuit effectively isolates the transmitters from each other and combines their outputs with high efficiency and minimum loss.

Abstract: An efficient circuit for coupling at least three radio frequency transmitters of arbitrary power and frequency to one antenna comprises a three-port circulator connected to the output of each transmitter, a four-port connector and a five-port inphase power combiner, and transmission lines having the same characteristic impedances connecting the circulators through the connector and the combiner to the antenna. The transmission lines interconnecting the components of the circuit have electrical lengths selected to deliver energy in phase to the ports of the connector and to the combiner. In a three-transmitter embodiment, one output port of each circulator is connected to the connector, a second output port of each circulator is connected to the combiner, and the output port of the connector is connected to the combiner. In a four-transmitter embodiment, one output port of each circulator is connected to the connector and the second output port of each circulator is connected to the combiner.