Abstract: A mobile antenna circuit for resonant transmitting from an RF signal source may comprise: an antenna having a base and at least first and second conductive sections one of which is extendable and retractable to lengthen and shorten the antenna; a motor operatively connected to one of the conductive sections for extending and retracting the antenna in response to control signals thereto; an impedance matching circuit coupling the RF signal source to the base of the antenna for matching impedance thereof at a specified frequency; and control components connected to the motor to produce control signals for extending and retracting the antenna section so as to resonantly tune the antenna at a specified frequency. The circuit may include a phase angle detector connected between the RF signal source and the impedance matching circuit for developing a voltage differential being fed to the control components for producing the control signals for extending and retracting the antenna section.

Abstract: An array antenna is provided wherein each adjacent pair of a plurality of antenna elements in such array antenna have a common, conductive wall having a castellated radiating edge. Radio frequency energy resistive material is disposed within slots formed in the radiating edge. With such arrangement, electrical coupling between the adjacent pair of antenna elements is reduced thereby improving the gain of the antenna at the lower frequency operating band of the antenna. Further, the electric field distribution is redistributed by the slotted radiating edge from a cosine distribution associated with a linear edge to a more flattened, uniform distribution to increase the effective aperture of the element in the H-plane.

Abstract: An antenna has a main vertical planar part which is connected at its one end to the ground, and a main horizontal planar part which are both arranged in an L-shape. It has a secondary vertical linear part which is arranged in parallel with the main vertical planar part and connected at its one end to the feeding point. It also has a conductive secondary horizontal linear part which is connected between the main horizontal planar part and the secondary vertical linear part and is arranged in parallel with the main horizontal planar part, while being separated from the main horizontal planar part by a definite distance. This makes it possible to incorporate the antenna in the circuit board of wireless communication equipment, and the antenna is particularly suitable for miniaturizing the equipment.

Abstract: A plane antenna assembly comprises a plurality of antenna bases and a signal composing means including amplifiers each connected to output part of each antenna base for composing respective outputs of the antenna bases amplified through the amplifiers, whereby a composite antenna output is obtained in correspondence to the number of the antenna bases and in an excellent S/N ratio.

Abstract: A versatile dual band satellite system includes a main conductive mounting plate member with a central opening of a predetermined size, and a KU band pick-up unit mounted in the plate to face a satellite antenna. A dielectric funnel support is mounted on the side of the mounting plate toward the antenna, and includes a central opening of the same size as that in the mounting plate, for receiving a C-band pick-up unit. The system includes appropriate microwave chokes and microwave impedance-matching structure, to improve the rejection of spurious or off-axis signals, and to maximize signal strength at the input of both the KU band and the C-band units. With the mounting openings in the main mounting member and in the dielectric funnel support being identical, full interchangeability of parts is practical, and an initial installation may include the C-band unit mounted in the mounting plate to face the antenna.

Abstract: A reconfigurable beam antenna system (12) comprises focusing means, a plurality of antenna elements (A, B, C, and D), a feed network (14), and a variable beam controlling means (16). The focusing means has a reflecting surface (18) which is adapted to reflect a plurality of electromagnetic energy signals. The feed network (14) comprises a plurality of feed ports (I1, I2, I3, and I4), a first plurality of hybrid couplers (30 and 32) connected to the feed ports, a plurality of phase shifters (34 and 36) connected to the first plurality of hybrid couplers, a second plurality of hybrid couplers 38 and 40 connected to both the first plurality of hybrid couplers and the phase shifters, and a plurality of antenna ports (01, 02, 03 and 04) connected to both the second plurality of hybrid couplers and the antenna elements (A, B, C, and D).

Abstract: To isolate a fault in a radar system, prior art teaches the disassembling of many of the components of the radar system and, by means of trial and error, substituting each component and testing the complete radar system to determine if the substitution was correct. In the present invention, the transmission path of the radar system is divided into a number of sections, with each section being independently connected to an adapter. After a section has been connected to an adapter, a resistive load having an impedance matching that of the antenna is mated to the adapter. Subsequently, a pulse is outputted from the transmitter of the radar system and transmitted along the transmission path. If the transmission path between the transmitter and resistive load is without fault, then the signal reflected from the resistive load and measured by a VSWR meter near the transmitter would be below a predetermined threshold, as the resistive load substantially attenuates the power of the outputted pulse.

Abstract: A gyratory device for mounting a parabolic antenna on a base or frame in which the gyratory part includes a tubular stationary part receiving a motor and drive connections within the tubular part, a sleeve surrounding the tubular part. Adjustable arms are provided to adjust the axis of the gyratory part relative to the rotary axis of the earth and to adjust the angle of the antenna on the sleeve.

Abstract: An apparatus and a method for supporting an electronic receiving or sending device on a tripodal tower are provided. The apparatus comprises a number of interconnected struts, braces, and support means connected to each other in a relationship that tends to counter or transfer twisting forces or torques caused by the wind resistance of said device into up and down forces that are easily countered by the tower. A method is provided, using the apparatus of the invention, for supporting a device on a tripodal tower.

Abstract: An antenna fabrication scheme for shaped reflector analyzes the geometry of the shaped reflector to be fabricated. On the basis of this analysis, a surface of revolution which closely approximates the shaped reflector is defined. The axis of revolution of the generated surface can then be employed by a single reflector shaping tool to describe the surface of revolution a portion of which approximates that of the desired shaped reflector. The shaped reflector is then effectively removed from the described surface by defining the perimeter of the shaped reflector on the surface of revolution.

Abstract: A waveguide-fed microwave system particularly for cavity-backed spiral antennas for the Ka band comprises a waveguide transmission line; a microwave device having a pair of balanced, parallel feed wires; and a doubled tapered ridge transformer directly connecting the waveguide transmission line to the balanced, parallel feed wires of the microwave device providing a direct symmetrical transition between the waveguide transmission line and the microwave device.

Abstract: Dual radome arrangement (15) comprising inner and outer layers (14,16) respectively transmissive to both modes of radiation operable in a detection system (11), and only one of the modes of radiation, and the outer layer (16) being selectively removable.

Abstract: A short, resonant top-loaded helical coil antenna having a flexible lower section is attached to one side of the housing of a receiver unit. The antenna is approximately eight inches in length, and extends outwardly from the receiver unit at an angle of about 30.degree. from vertical, so as to maintain a minimum spacing from the dog's neck.

Abstract: In a multimode or multispectral electromagnetic detection system (11), a pair of rotatable scanning prisms (13' and 13"), each of said prisms comprising at least a pair of cooperative subprisms (13'a, 13'b, 13"a and 13"b), and the cooperative materials of the subprism being selected so as to ensure that electromagnetic radiation passing through the pair of rotatable prisms is equally deviated in a transverse direction.

Abstract: A low and broadband shorted microstrip antenna is disclosed which is mainly applicable to a mobile body in a mobile communication system. A first grounding conductive sheet which faces a radiating conductive sheet is provided at both ends thereof with a second and a third grounding conductive sheets which are perpendicular to the first grounding conductive sheet, whereby a beam tilt characteristic of the antenna is improved. The passive element and a conductive stub are disposed atop the grounding conductive sheet. The passive element and the conductive stub face the radiating conductive element and serve to improve the impedance matching parameter of the microstrip antenna.

Abstract: The invention concerns a Doppler radar kinemometer intended to measure the speed of a railway vehicle. According to the invention, it includes two antennas (1,2) mechanically connected to one another such that their axes form a determined angle between them. This angle is preferably between 60.degree. and 120.degree.. For safety operation, the antennas are each supplied with ultrahigh frequency waves (F1,F2) by their own wave generators (4,5), and each furnishes corresponding Doppler frequencies (Fd1,Fd2) to a distinct processing unit (11,12), with the signals coming from these two processing units then processed within a computing assembly (15) which supplies the value of the measured velocity.

Abstract: An antenna (10) and method for fabricating the antenna (10) includes an inner panel (12) with a curved inner receiving surface (14) and an outer panel (16) in coextensive relationship to one another. A plurality of strips (20) having undulations (22) are positioned between the inner (12) and outer (16) panels for interlocking the panels (12, 16) together in predetermined positions to define a composite antenna (10) of substantial strength to present the inner surface predetermined close tolerances over the surface thereof. The undulations (22) of the strip (20) include platform portions (24) for engaging the panels (12, 16) and straight angulated portions (26) interconnecting the platform portions (24). The strip (20) includes raised ribs (30) in the straight portions (26) and hinge portions (28) between the straight portions (26) and platform portions (24) to allow the lateral extent of the strip (20) to increase as the thickness of the strip (20) between the panels (12, 16) is decreased during fabrication.

Abstract: An antenna element is mounted on a glass of a rear quarter window of a vehicle along the edge thereof. A coupling element is provided midway along said antenna element for coupling between two segmented elements with phase adjustment between reception signals thereof in a specific frequency range. The coupling element connects the two segmented elements in lower frequency range, and disconnects the two elements in higher frequency range. The length of the antenna element is automatically corrected in respective low and high frequency ranges so as to cover a wide range.

Abstract: A central aperture provides at least two radiation pattern modes. A second aperture concentric with the central aperture provides at least two radiation pattern modes. A first feed system excites the central aperture and a second feed system excites the concentric aperture. Circuit means associated with the second feed system provides an auxiliary excitation to the concentric aperture which results in optimizing the radiation pattern obtained during excitation of the central aperture.

Abstract: A multimode, multispectral antenna system (14) for detecting radiation from selected target regions in each of at least a pair of selected spectrum bandwidths through collimating lens (35), and rotatable, cooperative prisms (21) effective for collimating and scanning beams of radiation controllably with respect to said target regions.