Abstract: The disclosure is directed to a vehicle window equipped with a radio antenna as well as a heating defroster. A laminated window glass is employed advantageously which comprises inner and outer plates of glass facing respectively the interior and exterior of the vehicle. The heating structure is mounted on a first surface of the laminated glass. At least part of the antenna elements is formed on a second surface which is different from the first surface supporting the heater elements. The antenna bearing surface and/or heater bearing surface may be any surface of the laminated glass; the outer surface of the outer glass plate should be excluded from the supporting surface, however, because such surface is exposed to the exterior of the vehicle. Therefore, a relatively large area is always available for the antenna structure irrespective of the size of the window. It becomes more flexible and easier to make the design of antenna having the desired characteristics.

Abstract: An automatic antenna coupler is disclosed. The antenna coupler automatically matches the output impedance of a 50-ohm transmitter to the input impedance of a non-broad-band antenna, such as a whip, dipole or long wire. The resulting increase in transmit coupling efficiency provides greater radiative power than that available from an unmatched antenna.

Abstract: A magnetic antenna for a radio receiver such as a radio timepiece can be installed under restricted spacial conditions in a small housing or used as an antenna for a radio wristwatch. The antenna includes a core extending through a coil. The core is made of flexible, high permeability material, so that a flexible connection with the watch is obtained. A multiple flat strip conductor integrated into a watch bracelet serves as the connection between the coil and the receiver. Instead of being flexible, the core may be rigid but pre-formed in a non-linear shape.

Abstract: In an aircraft on-board radar system employing a sharply focused directional pattern which is able to sweep over a given space range, the range in the MPRF mode is limited primarily by the ground clutter picked up via the side lobes of the antenna pattern. To increase the range, an antenna is employed which, due to asymmetrical distribution of the antenna aperture (signal field) in the elevational direction with respect to the center of the aperture, has a significantly higher side lobe spacing below the principal lobe than above the principal lobe. Because of the side lobe spacing being greater below the principal lobe, less ground clutter components are picked up while the smaller side lobe spacing above the principal lobe results in hardly any increase of clutter components in the echo signal.

Abstract: A distribution network for a modified space-fed phased array antenna consists of a planar array of radiating slots distributed along a coplanar wall in each of an ensemble of parallel waveguides. This waveguide ensemble is fed or excited by an orthogonal waveguide or waveguides, through a row of slots in a wall common to the excitation waveguides and the parallel waveguide ensemble, one slot per waveguide. A predetermined amplitude distribution is achieved in the plane parallel to the axis of the exciting waveguide by adjusting the coupling value of each exciting slot, and in the orthogonal plane by adjusting the displacement of the radiating slots from the center line of the waveguides, and by adjusting slot width, length, and geometry. Such an array of slots is used to feed the inside face of a quasi-space-fed antenna array having identical, individual electronics modules.

Abstract: A microwave circuit module, more particularly an antenna, comprised of a polyethylene foam substrate having a loss tangent less 0.001 and a dielectric constant less than 1.3, a predetermined pattern of one or more elements, such as an array of n.times.m radiator elements, formed of electrically conductive material, deposited on a first surface of the substrate, and an electrically conductive ground plane secured to the opposite surface of the substrate. In the antenna embodiment, a feed network formed of electrically conductive material is deposited on said said first surface of the substrate for electrically interconnecting the radiator elements in the array; and I/O means are coupled to the feed network for supplying a signal to be transmitted by the antenna or for receiving a signal received by that antenna.

Abstract: An axial mode helical antenna includes a metal belt member disposed around the reflector of the antenna in order to permit use of reduced diameter reflectors and, therefore, to produce a small helical antenna having increased directivity.

Abstract: A slot antenna is integrated with and forms part of the housing for a miniature radio receiver having dimensions comparable to the dimensions of a credit card. The antenna is formed by three plates arranged to have a generally U-shaped cross section. One plate is on one side of and is approximately the dimensions of the "credit card" receiver. A second plate is much more narrow and extends along one edge of the other side of the "credit card" receiver in a spaced parallel relationship with the first plate. The third plate extends vertically between the first two plates and along the one edge of the "credit card" receiver. Together, the three plates make up not only the antenna, but also three sides of the housing of the receiver.

Abstract: An antenna has an antenna unit or an array of antenna units, each having a plurality of radiating elements each in turn having a plurality of open-circuit stubs spaced from one another by a distance substantially smaller than a wavelength of a guided wave travelling through the antenna.

Abstract: A radar antenna of small overall dimensions is provided, placed in a belly radome, including a reflector of paraboloid shape of revolution about the longitudinal axis and integral with a case. This assembly is mounted for pivoting about the transverse axis and about the vertical axis inside the radome.Rotation about the longitudinal axis called roll axis is provided by rotating the transmission source by rotation means placed inside the case and the duct. With the reflector fixed in the roll direction, the area thereof may extend over the whole of the inner section of the radome, rotation of the radar beam along the roll axis being obtained through rotation of the source with respect to the reflector.

Abstract: An antenna system includes an array of microstrip antenna elements wherein each of the elements includes two or more radiators. Electromagnetic signals are coupled from an input terminal of each element via one or more circulators which allow for application of an input signal to a first of the radiators followed by rerouting of respective signals to the next radiator. The radiators are turned to radiate at successively higher portions of the electromagnetic spectrum. By virtue of reflections of higher frequency radiation from a radiator tuned to a lower portion of the signal spectrum, each radiator radiates only that portion of the signal spectrum falling within the bandwidth of the radiator. By using three radiators, each antenna element is capable of radiating a signal spectrum three times as wide as are the bandwidths of a single radiator. Included within the antenna system is one or more power dividers to form one or more beams of radiation.

Abstract: A jettisoning cover for a munition arranged to be held against the end of a ring secured to the end of a munition which is fired at a high velocity through the atmosphere. The cover protects the contents of the munition from the high velocity through the atmosphere but is jettisoned after the velocity has slowed. The cover is held by two clips on the ring directed over the cover and a third clip on the cover engaging a notch in the ring. A detent mounted within a recess in the ring extending into a hole in the cover secures the cover in place.The detent is secured by a shear pin through the detent and an adjacent slider in an arcuate channel. The slider is propelled by an explosive powered piston which shears the shear pin to release the cover. A spring from the cover is wrapped around the ring when the cover is attached and provides energy to jettison the cover when the cover is released.

Abstract: A window-mounted cellular mobile telephone antenna includes an outside module for mounting on the outside surface of a vehicle window in registration with an inside module mounted on the inside surface of the window. The outside module includes a capacitive coupling element and a generally vertical radiating element not less than 5/8 wavelength at the antenna operating frequency. The inside module includes a self-contained electrical circuit forming a ground-plane for the radiating element, an inductor for matching the impedance of the radiating element to that of a coaxial feedline, and a capacitive coupling element interacting with the coupling element of the outside module and the dielectric of the window glass to form a coupling capacitor. The length of the radiating element may be increased beyond 5/8 wavelength to reduce impedance matching requirements in the inside module.

Abstract: An embedded surface wave antenna is described of compact design capable of broadband performance both for impedance match and for radiation pattern characteristics comprising two spaced apart conductive planar elements, one element being a transition from a narrow portion to a wider portion according to a continuous function, said one element having an upward inclination away from the other of said conductive planar elements and ending in a termination at the wider portion, a tapered lens material having a downward inclination from said termination toward said other of said conductive planar elements to define a sloping surface therebetween for launching and receiving electromagnetic waves. The subject surface wave antenna may be readily adapted into assemblies of radiating elements in a predetermined electrical and geometric configuration to provide an array rendering a preferred radiation pattern.

Abstract: A window-mounted cellular mobile telephone antenna and method of installation includes an outside coupling module for mounting on the outside surface of a vehicle window in registration with an inside coupling module mounted on the inside surface of the window. The outer coupling module includes a metallic base having a contoured portion for pivotally mounting a vertical radiating element, and a generally flat window engaging portion for engaging the window glass. A peripheral channel formed on the engaging portion defines a central engaging surface. An adhesive layer applied to the engaging surface engages the surface of the glass when the base is positioned on the glass for use. A bead of silicone adhesive in the channel expands against the glass to protect the adhesive layer from exposure to water and contaminants.

Abstract: A non-grounded type ultrahigh frequency antenna including an antenna element having a length of .lambda./2 at a working frequency, a casing provided at the base of the antenna element, a metal section of the casing having a length of approximately .lambda./4 at the working frequency, and a metal plate provided in the casing and parallel to the metal section, one end of the metal plate being connected to the metal section and other end to the antenna element. The antanna is made parallel-resonant within a working frequency band by an electrostatic capacitance created between the metal plate and metal section and an inductance of the metal plate. The antenna element can be made slightly shorter than a length .lambda./2 at the working frequency and another metal plate can be provided between the antenna element and the metal plate so that a constant K-filter is formed by an electrostatic capacitance created by the another metal plate and the metal plate and a residual inductance of the antenna element.

Abstract: A scanning antenna comprises a non-magnetic, electrically conductive radiation horn defining an antenna opening having a predetermined central line of focus, and at least one magnetically switchable conductive element such as a reed relay mounted to extend across the antenna opening perpendicular to and spaced from the central line of focus. A magnetic field generator such as an electromagnet is positioned to generate a magnetic field to control switching of the conductive element between its conductive and non-conductive states, and a control circuit controls operation of the magnetic field generator.

Abstract: A gridded radiating element for printed circuit antennas employing capacitive coupling of radiating elements to feedlines. The radiating element is formed of a grid wherein a metallization region is etched selectively to yield a plurality of metal strips disposed parallel to each other with a predetermined separation. This element, in contrast to known elements which employ solid metallization regions, finds particular application in dual polarization geometries, and enables improved performance over a wide bandwidth.

Abstract: An antenna and its electronic circuit combination is presented to comprise a ground conductor plane 30, a radiating conductor plane 40 disposed in parallel spaced relation to the ground plane 30 and shorted at its one end to the ground plane 30. A ground plane 30 is preferably formed on a printed board 10 which is disposed in parallel relation to the radiating plane 40 to define therebetween an open air space. Mounted on the printed board 10 and received within the open air space are electronic components which form a receiving or transmitting electronic circuit 60 associated with the antenna structure and electrically coupled by means of a feed element 20 to a feed point 44 on the radiating plane 40.

Abstract: The radiating portion of the antenna is formed from two similar radiating doublets (1,3; 2,4) which are located in a single plane and are orthogonal, with the slots between driven elements of the doublets crossing one another at the center (C) of the unit antenna.The two doublet modules (1,3; 2,4) are associated with the central conductors of three-plate lines which are orthogonal, with their extensions crossing one another beneath the center (C) of the antenna. Each three-plate line consists of the plates (1,3; 2,4) of a doublet, on the one hand, a reflector, on the other hand, and between the plates and the reflector, the central conductor. The reflector is common to the two doublets.