Abstract: The invention is directed to an antenna array comprised of conical helical antennas with at least one of the antennas being a tilted conical helical antenna. In one embodiment, a tilted conical helical antenna in the array comprises an electrically conductive wire that follows a helical path on a frustum of an oblique elliptical cone in which the axis of the cone is tilted relative to the planar base surface of the cone (i.e., not perpendicular or parallel to the surface) in a plane defined by the axis and a phase center axis of the array. Each of the tilted conical helical antennas in an array is spaced from the phase center axis of the array. The degree of tilt increases the farther an antenna is located from phase center axis.

Abstract: A wireless network receiver includes a circuit board and a connector structure. The connector structure is fixed on the circuit board, and the connector structure includes a connector and an antenna. The antenna, crossing the circuit board, and the connector are integrally formed with as a whole. The antenna includes a feeding connecting member, a horizontal radiator, a vertical radiator and a grounding connecting member. The horizontal radiator generates a horizontally polarized wave and is connected to the feeding connecting member. The vertical radiator generates a vertically polarized wave and is connected to the horizontal radiator. The grounding connecting member connects the horizontal radiator to the connector.

Abstract: The present relates to a leaky-wave antenna unit. The leaky wave antenna unit comprises a leaky wave antenna having two ports and a switching unit. The switching unit comprises an input, two throws and an actuator. The input of the switching unit receives a signal to be radiated by the leaky wave antenna. Each of the throw is connected to a different port of the leaky wave antenna, while the actuator switches the input between the two throws.

Abstract: A dual mode ground penetrating radar includes an enclosure which houses radar electronics. The dual mode ground penetrating radar includes an enclosure housing radar electronics. The dual mode ground penetrating radar further includes a first antenna feed having ferrite loading and extending outside of the enclosure. The dual mode ground penetrating radar further includes a second antenna feed spaced apart from the first antenna feed, the second antenna feed having ferrite loading and extending outside of the enclosure. An RF signal is provided in at least one of the first and second antenna feeds by the radar electronics.

Abstract: A first antenna section included in an antenna has a first conductor, supplies electric power to a plurality of tags, and transmits electromagnetic waves to and receives electromagnetic waves from the plurality of tags. One end of the first conductor is a feeding point and an other end of the first conductor is an open end. The first conductor is connected to a reader-writer device for communicating with the plurality of tags. The first conductor can output electromagnetic waves. A second antenna section included in the antenna has a second conductor one end of which is a feeding point, an other end of which is an open end, and which is opposite to the first conductor of the first antenna section with the plurality of tags therebetween.

Abstract: A slot antenna having stubs is provided, in which a strip transmission line for transmitting a transverse electromagnetic mode (TEM) signal is formed by using a multi-layered substrate, and a plurality of slots are used for the strip transmission line. Thus, an omnidirectional radiation pattern is obtained, and the directivity of the slot antenna is improved.

Abstract: A low-loss, high-efficiency, broadband antenna including both electric and magnetic dipole radiators is provided herein. The broadband antenna may be referred to as a “P×M antenna” and may generally include a ground plane; a magnetic radiator formed within the ground plane; a conductive feed arranged within a first plane, which is parallel to the ground plane; and an electric radiator arranged within a second plane, which is perpendicular to the ground plane and coupled at one end to the conductive feed. According to a particular aspect of the invention, the electric and magnetic radiators are substantially complementary to one another and are coupled for producing a P×M radiation pattern over a broad range of operating frequencies. One advantage of the P×M antenna described herein is that the complementary antenna elements are combined without the use of a lossy, resistive matching network, thereby increasing the efficiency with which the P×M radiation pattern is produced.

Abstract: The invention concerns an antenna for use as transmission/reception beacon (2), in a radio frequency identifying system, having a general upturned U configuration, located in a vertical plane, above the ground transversely to a passage (9), the vertical end portions (8b, 8c). The invention is applicable to a system for detecting, over a large width (L), the passage of people, animals or objects bearing electronic tags (7).

Abstract: A folded monopole antenna uses two vertical monopole antenna elements one of which is tapered and resistively loaded to a ground plane. The tapered vertical monopole antenna element includes a series of operably coupled cylindrical sections that extend from a base end of this element to its top end. The cylindrical sections decrease in diameter from the base end to the top end of this element. The second monopole antenna element has a substantially constant outer diameter. An antenna feed is coupled to this second element. A third antenna element of substantially equivalent diameter to the second element is operably coupled to the top ends of the first and second antenna elements. In both transmitting and receiving modes, the tapered monopole antenna element is considered to cause a cancellation of the electric field from the feeding antenna element and thereby provide a wide range of impedance matching.

Abstract: An antenna scanned by frequency variation, comprising: exciter means for producing a plane electromagnetic wave at a given frequency which is variable about a center frequency; and radiating means receiving the plane wave produced by the exciter means and subjecting the plane wave to a plurality of successive reflections, the radiating means including means for allowing a fraction of the plane wave to leak to the outside after each successive reflection in order to enable it to radiate to the outside; the phase shift of the wave between two reflections varying as a function of the frequency of the wave and the set of radiated waves produced in this manner thus having a determined relative phase difference, which is variable as a function of the frequency of the wave generated by the exciter means and which defines transmission having a main lobe whose direction is itself variable as a function of the said frequency.

Abstract: A patch antenna array having multiple beam-forming capability is formed as a feed network (15) on a lower microstrip substrate with patches (13) overlaying these on an upper substrate. The patch array consists of a number of linear series-connected patch arrays (13a, 13b, 13c) each array being resonant and may have open circuits at each end. A travelling wave arrangement of feed lines (15a, 15b, 15c) is provided and in one embodiment the total number of beams which may be generated is twice the number of feed lines. The invention is useful in small satellite communication earth terminals and is suitable for operation in the region of 10 GHz.

Abstract: A distributed antenna system for wireless communication inside enclosed areas such as buildings, tunnels, etc., includes an antenna cable and a termination circuit which provides a plurality of termination impedances for the cable, varying as a function of time. The termination circuit may include a diode coupled to the cable at a remote end of the cable and a bias voltage generator coupled to a local end of the cable. Changes in bias voltage alternately forward biases and reverse biases the diode, effectively changing the termination impedance of the antenna cable. As the impedance changes, nodes and regions of high multipath distortion move, so the probability is greatly increased that personnel with remote communication equipment will be able to send and receive good quality signals over the antenna cable at any given location.

Abstract: An antenna system particularly suited for wind profiling produces a radio beam which can be oriented in each of four directions and optionally in a fifth, vertical direction and four intermediate directions. The antenna has a single array of strings of coaxial-colinear antenna elements. The strings are formed into sections, with each section having a first string portion formed of cable elements which are longer than one-half wavelength of the radio frequency drive signal in the cable and a second string portion formed of cable elements which are shorter than one-half the wavelength of the drive signal, with the two strings being connected together and mounted parallel to and above and below one another. Power is directed to the strings so that the radio frequency power flows in opposite directions in each string portion. The beam radiated from each string portion in each section adds to produce a beams tilted from the normal to the string portions by the same angle for both string portions.

Abstract: Disclosed are apparatus and method for obtaining energy from high electrical charge density entities. The energy may be received by the conductor of a traveling wave device positioned along the path which the propagating entities follow. Multiple traveling wave devices may be combined. Energy output from a traveling wave device may also be directed to the generation of a subsequent such entity. Thermal energy may also be obtained from an EV.

Abstract: Wideband antenna systems may provide continuous coverage over the VLF, HF, VHF, and UHF frequency ranges. Matching transformers, insertion resistors and damping elements are integral parts of these antenna systems.

Abstract: A broadband frequency meter probe utilizes a high frequency antenna and a low frequency antenna to sense wideband electromagnetic energy wherein the different frequency band antennas are closely based monopole and disk antennas. A three-dimensional probe is disclosed having three mutually orthogonal antenna pairs. Damping is provided to decouple resonance which would otherwise occur between the monopole and disk antenna. Self-checking for sensing operation of associated electronics and for providing an indication of normal and abnormal operating conditions is included.

Abstract: Disclosed are apparatus and method for obtaining energy from high electrical charge density entities. The energy may be received by the conductor of a traveling wave device positioned along the path which the propagating entities follow. Multiple traveling wave devices may be combined. Energy output from a traveling wave device may also be directed to the generation of a subsequent such entity. Thermal energy may also be obtained from an EV.

Abstract: This disclosure sets forth a device which produces uniform electromagnetic ields in the medium frequency (MF) and high frequency (HF) regimes over significantly large test volumes. The device converts electromagnetic energy available from a standard radio-frequency transmitter into a vertically polarized uniform electromagnetic field which propagates through a large open region and is dissipated/radiated at the termination. A broadband (MF and HF) electromagnetic radiation over a large test volume is provided.

Abstract: A termination for a VHF inverted-V half-rhombic antenna is described, consisting of a transformer terminated into a length of high attenuation coaxial cable acting as a power dissipation line.

Abstract: A broad band antenna suitable for mounting on a ground plane comprises a pair of spaced-apart, linear hollow monopoles perpendicular to the ground plane and an air-dielectric coaxial transmission line extending linearly between the monopoles parallel to the ground plane. Means are provided grounding the outer conductor of the transmission line to the ground plane, the inner conductor top-connecting the monopoles.

Abstract: An antenna consisting of three separate members, two members which are oriented perpendicular to a ground plane which function as short monopole antennas and a third member parallel to and above the ground plane which functions as a single conductor transmission line above ground, top-connecting the two antennas. One of the monopole antennas is connected to the ground plane through a terminating resistor and the other monopole is connected to the ground plane through an impedance matching transformer. The antennas mount on a ground plane, an electrically conducting surface such as the roof of a vehicle, aircraft or other suitable surface, and take an aerodynamic shape. The antenna exhibits a cardioidal pattern over an azimuth angle of approximately 120.degree. and is especially applicable for use in a multiple antenna arrangement in the application of direction finding systems. The antenna is useful over a wide range of frequencies without adjustment, because of its broad bandwidth, which exceeds 100:1.

Abstract: An electrically small, directive, low backlobe broadband antenna is described. The antenna comprises a pair of radiators. Each of the radiators comprises a pair of orthogonally oriented stripline sections carried on a thin substrate. In one embodiment the radiators are carried on separate substrates placed side by side with a small separation. In another embodiment, the radiators are carried on opposite sides of the same substrate. In each of the embodiments, the radiators are mounted adjacent to a ground plane. A first one of the orthogonal sections is spaced from and extends parallel to the ground plane. The second of the orthogonal sections extends from the first section to the ground plane and is adapted at that point for coupling to the center conductor of a coaxial cable. Means are also provided for coupling the outer conductor or shield of the cable to the ground plane. A resistor is further provided coupled between the ground plane and the free end of each of the first sections of the radiators.