Abstract: A directive communications antenna comprising upper and lower plates, each having a leading edge, and a parabolic reflecting cylinder disposed between and axially intersecting the plates so as to form a cavity having a focus line. The cavity is open adjacent the plate leading edges. Upper and lower lip plates respectively extend along the leading edges of the upper and lower plates with both lip plates projecting upwardly therefrom. A feed assembly comprised of a feed probe and a sub-reflector is positioned within the cavity.

Abstract: An internally mounted broadband antenna utilizing two resonators and a reactive ground feed is disclosed. A nonconductive notch separates a conductive surface into two portions which are coupled to a respective one of each resonator. Each resonator is a microstrip conductor forming a transmission line with its respective conductive surface portion. Coupling to the antenna is accomplished by connection across the notch.

Abstract: A drive control device for an electrically-driven extending and retracting antenna such as an antenna on an automobile including a motor-driven rotary plate which makes approximately one revolution during the time for complete extension or retraction and has attached, on one side, a disk-shaped conducting part with a small cut-out. Of the three contacts, the first is ordinarily in contact with the disk-shaped conducting part, maintaining a state of electrical continuity, the second contact contacts the small cut-out when extension of the antenna is completed; and the third contact contacts the small cut-out when retraction of the antenna is completed. As a result, electrical continuity is maintained during extension or retraction of the antenna, but not when extension or retraction has been completed. The first and second contacts thus constitute a limit switch for antenna extension; and the first and third contacts constitute a limit switch for antenna retraction.

Abstract: An on-glass antenna for a vehicle is provided having a radiator for location on the outside of the vehicle window and a cable for location on the inside of the vehicle window for coupling the radiator to a transmitter/receiver. The cable comprises a first cable portion, a second cable portion, and an impedance matching member at the intersection of the first and second cable portions. The first cable portion and the impedance matching member together have a combined electrical length of about 1/4 wavelength.

Abstract: An antenna element conductor is formed on a transparent insulating film. An adhesive is applied to the rear surface of the film. A connector is provided to a feeder terminal. A print antenna comprising the film and the antenna conductor can be attached to a glass surface, and a position of the antenna on the window glass can be desirably selected so as to obtain good antenna characteristics.

Abstract: Disclosed is a circular waveguide in which a slots are formed which are shaped and disposed such that they interrupt either the right hand or left hand circulating mode (RC and LC respectively) residing in the waveguide. Locating the slots in the waveguide wall is accomplished in accordance with the theory that for TE modes in circular waveguide with circumferential variation of e.sup..+-.jm.phi., current flow lines are produced that are helical. The slots are located so as to interrupt the helical current of the desired mode. In one embodiment, an ortho-polarization mode transducer and a circular polarizer are used to feed the slotted waveguide. By control of the amplitude and phase of the energy propagating in the waveguide, azimuthal pattern control can be effected. By dielectric loading the waveguide to make .lambda.g in the loaded waveguide equal to .lambda.-free space, endfire radiation can be achieved.

Abstract: A radome-lens comprises a shell of dielectric material having an outer surface in the form of a small circle defined by a sphere and a plane intersecting the sphere, an opening at one end of the shell for reception of an antenna therein, the surface having a central axis which is normal to the plane and extends through the center of the sphere, and an inner surface having a spherical portion centered at a second center disposed along the axis adjacent the first mentioned center but spaced toward the outer surface. When so constructed, the invention functions as a radome in the sense that it houses and protects an antenna in the usual manner and also functions as a lens in the sense that it amplifies the scan angle of the antenna from an angle of less than 90.degree. to 90.degree. or more.

Abstract: A radar antenna element comprises a lower band waveguide and an array of parallel, dual-polarized, higher band waveguides and dipoles mounted within or directly adjacent an aperture of the lower band waveguide. The lower band waveguide and each higher band waveguide have one cross-sectional dimension less than 0.5 wavelength. A choke section, tuned dielectric or absorber isolates signals of the higher band waveguides from signals of the lower band waveguide. An array of such radar antenna elements locates a radar target with lower band signals and tracks that target with higher band signals, for instance.

Abstract: An antenna for a portable cellular telephone includes a quarter-wavelength ground radiator and a helical coil capacitively coupled to an extendable half-wavelength radiator. The extendable half-wavelength radiator includes a metallic coil molded in plastic. The ground radiator includes a serpentined transmission line on a flexible circuit board. The helical coil and ground radiator are coupled by a transmission line to a duplexer. The duplexer couples transmitter signals from a radio transmitter to the antenna and receiver signals from the antenna to a radio receiver. The antenna may be advantageously utilized in any portable radio applications where small size and immunity to hand induced radiation losses are desired.

Abstract: A unitary, multiband and dual polarity mobile antenna (A) is disclosed for vehicles and the like which includes a television antenna (B) having a horizontally polarized radiation pattern and a 2-way communications antenna (C) having a vertically polarized radiation pattern. A null current point (50) is created on communications antenna (C) by a phasing coil (34) which is intersected by a horizontal plane (52) in which television antenna (B) lies. This reduces cross-coupling, cross-polarization, and interference between the two antenna during operation. Horizontal television antenna (B) includes a J-folded, generally boomerang shaped, curved antenna configured to have a radiating element (20) and a half radiating element (22). These elements together form a third radiating element providing operation at three resonant frequencies.

Abstract: An inverted offset system is used for sending and/or receiving electromagnetic energy. The system, which is preferably a Cassegrainian microwave antenna system, includes a water-tight cover to protect the feed compartment, subreflector, and main reflector of the antenna. The cover protects against the effects of precipitation and is especially useful when the system is used for measuring atmospheric conditions such as rain or snow. A waterguard ridge and drain passageway are used to protect the feed compartment from precipitation when the antenna is disposed in a position to send or receive beams which are substantially vertical.

Abstract: An antenna system for mounting on a glass plate with a radiator extending from one side of the glass plate and with an electrical connector and a cable extending from the opposite side of the glass plate whereby energy is transferred through the glass plate. Coupling means for a cable is provided, defining a receptacle for retaining the coupled end of the coaxial cable at an angle of essentially 15 to 60 degrees to said glass plate in said mounted position. Also, the antenna may define a helical base portion which may be attached to the glass plate on the side opposite to the coupling means. The helical base serves to shorten the antenna, and also to simultaneously serve as an electrical phase cancelling coil. Additionally, improvements are disclosed in the design of field cancelling conductors used.

Abstract: An integral portable receiver/antenna system is provided which includes an isolation coupler element exhibiting a geometry which is substantially closed upon itself and which is situated between the receiver antenna and the input of the receiver. A portion of the antenna element is distributively coupled to a portion of the coupler element. The receiver/antenna system further includes a ground plane which is sufficiently close to a portion of the coupler element such that the ground plane is distributively coupled to the coupler element. The coupler element prevents the formation of undesired signal loss paths between the antenna and the receiver and provides for impedance matching the input of the receiver to the antenna. The coupler element also couples signals to the receiver input which would otherwise be lost to the ground plane.

Abstract: A feedhorn for a satellite dish which is far more efficient picking up the transmitted microwave signal from a satellite so as to permit the satellite dish to be substantially decreased in physical size. The feedhorn is constructed to pick up either the C-Band or the Ku-Band, each in either the horizontally polarized mode or the vertically polarized mode. The feedhorn utilizes dipoles for picking up the microwave signal which are then transmitted by a coaxial cable to a printed circuit board assembly. The received signal from the printed circuit board assembly is then transmitted through a receiver. The selection of the particular band of frequency that is to be transmitted from the feedhorn and the selection of the horizontal mode or the vertical mode is to be accomplished by a remote actuator such as is commonly used with a conventional television receiver.

Abstract: A method is provided for manufacturing a parabolic reflector antenna carried by a parabolic support made from an appropriate insulating material.

Abstract: A mobile communications antenna assembly for use over a selected band of frequencies in the VHF an UHF ranges, has, a radiating element with first, second and third, collinear radiating sections. The first and second sections each have an electrical length substantially equal to five-eights wavelength over the selected band, while the third section has an electrical length substantially equal to one-quarter wavelength. Phase inductor elements connect the sections for maintaining a predetermined phase relationship between electrical signals radiating from the sections. The third section further has a radiating surface area that is substantially greater than the radiating surface areas of the first and second sections. The base end of the third section is mounted to be elevated above the surface. The transmission line is connected to impedance matching means at a point where impedance of the two is substantially equal.

Abstract: A planar integrated opto-electronic transceiver apparatus having a pair of broadband tapered slot line antennas which are monolithically integrated on an ion implanted silicon on sapphire substrate. An optical pulse which is applied to the narrow slot of the transmitting antenna, generates an electromagnetic transient to the antenna aperture from which it is radiated to receiver slot line antenna. The received electromagnetic transient is detected at the narrow slot and is time resolved by an optical sampling signal.

Abstract: A multibeam antenna system in which an antenna aperture element is deliberately selected to produce a divergent beam at a desired angular beamwidth. The antenna aperture may, for example, take the form of a hyperboloid reflector, a diverging lens, or a defocused paraboloid reflector. For the divergent secondary beams produced in these configurations, the angular beamwidth may be conveniently controlled by varying the mangification of the aperture or the degree of defocusing, without significantly affecting the gain or efficiency of the system. The degree of beam overlap may be independently controlled by scaling the size of the aperture, without significantly affecting the beamwidth, the gain or the efficiency.

Abstract: The invention is a cooling apparatus for electronically steered phased array antennas in radar systems. The apparatus includes a rigid tube, used in multiplicity with a series of identical apparatus, located adjacent to the transmitter/receiver modules in the antenna and having a plurality of longitudinal slots. Flexible hoses are inserted into the tubes so that when a liquid coolant is introduced under pressure into the hoses, the fluid pressure will be sufficient to cause expansion of the flexible hose material enough so the material expands outward through the slots in the tubes and becomes flush against the side of the transmitter/receiver modules, thereby maximizing heat transfer between the modules and the liquid coolant.

Abstract: A low-profile antenna for operating in the 800 to 900 mHz range and especially suited for use with portable, hand-held electronic apparatus. The antenna features printed circuit board construction for precision fabrication, broadband operations and enhanced efficiency. The antenna includes a driven element in close association with a parasitic element printed on one surface of the printed circuit board in a side-by-side, parallel relation. A conductive strip is included on the other side of the board spanning the free ends of the driven and parasitic elements to enhance the coupling therebetween.