Abstract: A compact munition antenna system that includes a curvilinear transmit antenna on a top and bottom of a ring-shaped substrate, and a curvilinear receive antenna on the top and bottom of the substrate. The transmit antenna and receive antenna are positioned opposite one another on the substrate, and are separated by a pair of isolation barriers to reduce coupling of the two antennas. The munition antenna system may be mounted on a metal cylindrical portion of a guidance system in a nose section of the munition, using a vertical convex surface of the cylindrical portion and a horizontal surface of the munition as a reflector for improving antenna performance.

Abstract: A transportable, resilient, high frequency system with a compact footprint is provided. The system may include a plurality of antenna elements arranged around a circle. A circular array provides a resilient radiation pattern that does not change based on the number of antennas in the array and is tolerant of errors in antenna placement. The gain of the system may be increased by increasing the number of antenna elements in the array to compensate for reduced efficiency of antenna elements having a radiating element with a length of less than half the wavelength of an operating frequency of the array.

Abstract: A phased array is disclosed, including: a base layer including a substrate with a plurality of protruding posts, for stopping wave propagation along the base layer, and a printed circuit board (PCB) arranged on the base layer, and including at least one phased array radio frequency (RF) integrated circuit (IC) on a first side of the PCB facing the base layer and the protruding posts. The PCB further includes feeds for transferring of RF signals from the phased array RF IC(s) to an opposite second side of the PCB. A radiating layer, including a plurality of radiating elements for transmitting and/or receiving RF signals from the phased array antenna is also provided, together with a feeding layer for transfer of RF signals, arranged between the feeds of the PCB on the second side and the radiating elements of the radiating layer.

Abstract: A horizontally polarized antenna array allows for the efficient distribution of RF energy into a communications environment through selectable antenna elements and redirectors that create a particular radiation pattern such as a substantially omnidirectional radiation pattern. In conjunction with a vertically polarized array, a particular high-gain wireless environment may be created such that one environment does not interfere with other nearby wireless environments and avoids interference created by those other environments. Lower gain patterns may also be created by using particular configurations of a horizontal and/or vertical antenna array. In a preferred embodiment, the antenna systems disclosed herein are utilized in a multiple-input, multiple-output (MIMO) wireless environment.

Abstract: Systems and methods according to one or more embodiments are provided for a scalable planar phased array antenna subarray tile assembly. A scalable phased array antenna subarray tile assembly is implemented as a printed wiring board (PWB) with antenna elements coupled to the PWB. In one example, a PWB includes integrated circuit die attached directly to a first surface of the PWB and couple to antenna elements coupled on a second surface of the PWB. First conductive vias extend through a first subset of PWB layers and couple to the integrated circuit die. Second conductive vias, larger than the first, extend through a second subset of PWB layers and couple to the antenna elements. A conductive trace couples the first and second conductive vias on a PWB layer. The second conductive vias are offset from the first to provide a thermal mechanical stress relief to the integrated circuit die.

Abstract: A miniaturized ultra-wideband multifunction antenna comprising a conducting ground plane at the base, a plurality of concentric feed cables, one or more omnidirectional one-dimensional (1-D) normal-mode and two-dimensional (2-D) surface-mode traveling-wave (TW) radiators, frequency-selective internal and external couplers, and a unidirectional radiator on top, stacked and cascaded one on top of the other. Configured as a single structure, its unidirectional radiator and plurality of omnidirectional TW radiators can cover, respectively, most satellite and terrestrial communications, with unidirectional and omnidirectional radiation patterns, respectively, needed on various platforms. This new class of multifunction antenna is ultra-wideband, miniaturized and low-cost, thus attractive for applications on automobiles and other small platforms.

Abstract: The specification discloses a low-profile, ultra wideband, inverted f antenna having increased bandwidth. The antenna includes a ground plane, a planar antenna element spaced from the ground plane, a first tubular element electrically connected to and extending from the ground plane toward the antenna element, and a second tubular element electrically connected to and extending from the antenna element toward the ground plane. The tubular elements physically interfit but are electrically separated. The antenna is compatible with LTE, GPS and satellite radio communications to provide a compact antenna suitable for use in automotive and other applications.

Abstract: A class of ultra-wideband miniaturized traveling-wave (TW) antennas comprising a conducting ground surface at the base, a plurality of TW structures having at least one ultra-wideband low-profile two-dimensional (2-D) surface-mode TW structure, a frequency-selective coupler placed between adjacent TW structures, and a feed network. In one embodiment, a 2-D surface-mode TW structure is positioned above the conducting ground surface, a normal-mode TW structure placed on top with an external frequency-selective coupler placed in between; continuous octaval bandwidth of 14:1 and size reduction by a factor of 3 to 5 are achievable. In other embodiments using at least two 2-D TW structures and a dual-band feed network, a continuous bandwidth over 100:1, and up to 140:1 or more, is reachable. In yet another embodiment, ultra-wideband multi-band performance over an octaval operating bandwidth up to 2000:1 or more is feasible.

Abstract: A scheduling method in a distributed antenna system is provided. Each of a plurality of Mobile Stations (MSs), respectively corresponding to each subchannel, are classified as a Single Transmission (ST) MS or a Cooperative Transmission (CT) MS according to a CT criterion. An MS with a maximum channel capacity is selected from among the classified MSs. Resources are allocated to a corresponding subchannel when the selected MS is the ST MS, and resources are allocated using a CT scheduling technique when the selected MS is the CT MS. The classifying, selecting and allocating steps are repeated until allocation of resources is completed.

Abstract: The invention relates to a measuring system for detecting radio-frequency tags, a measuring method, and a new use for a leaky waveguide. The measuring system comprises a reading device and an antenna, which is connected to reading device for connecting to the tags. According to the invention, the antenna is a microstrip-type leaky waveguide having a length which is several times the operating wavelength of the tags. The invention permits reliable and precise RFID detection, for example, for a results service for sports events.

Abstract: A class of ultra-wideband miniaturized traveling-wave (TW) antennas comprising a conducting ground surface at the base, a plurality of TW structures having at least one ultra-wideband low-profile two-dimensional (2-D) surface-mode TW structure, a frequency-selective coupler placed between adjacent TW structures, and a feed network. In one embodiment, a 2-D surface-mode TW structure is positioned above the conducting ground surface, a normal-mode TW structure placed on top with an external frequency-selective coupler placed in between; continuous octaval bandwidth of 14:1 and size reduction by a factor of 3 to 5 are achievable. In other embodiments using at least two 2-D TW structures and a dual-band feed network, a continuous bandwidth over 100:1, and up to 140:1 or more, is reachable. In yet another embodiment, ultra-wideband multi-band performance over an octaval operating bandwidth up to 2000:1 or more is feasible.

Abstract: Aspects of a method and system for identifying a radio frequency identification (RFID) tag location using a switchable coil are presented. Aspects of the systems may include one or more processors that enable selection of an inductor coil from a plurality of inductor coils. The selection of the inductor coil may be based on a change in an electromagnetic field, with respect to an initial electromagnetic field, as detected by the selected inductor coil. The processors may enable transmission of a signal, having a transmitter frequency in the UHF frequency band, via the selected inductor coil.

Abstract: A class of ultra-wideband miniaturized traveling-wave (TW) antennas comprising a conducting ground surface at the base, a plurality of TW structures having at least one ultra-wideband low-profile two-dimensional (2-D) surface-mode TW structure, a frequency-selective coupler placed between adjacent TW structures, and a feed network. In one embodiment, a 2-D surface-mode TW structure is positioned above the conducting ground surface, a normal-mode TW structure placed on top with an external frequency-selective coupler placed in between; continuous octaval bandwidth of 14:1 and size reduction by a factor of 3 to 5 are achievable. In other embodiments using at least two 2-D TW structures and a dual-band feed network, a continuous bandwidth over 100:1, and up to 140:1 or more, is reachable. In yet another embodiment, ultra-wideband multi-band performance over an octaval operating bandwidth up to 2000:1 or more is feasible.

Abstract: Aspects of a method and system for identifying a radio frequency identification (RFID) tag location using a switchable coil are presented. Aspects of the systems may include one or more processors that enable selection of an inductor coil from a plurality of inductor coils. The selection of the inductor coil may be based on a change in an electromagnetic field, with respect to an initial electromagnetic field, as detected by the selected inductor coil. The processors may enable transmission of a signal, having a transmitter frequency in the UHF frequency band, via the selected inductor coil.

Abstract: According to one embodiment, a radio communication system includes at least two leaky transmission lines provided in parallel to each other and configured to radiate a part of electric signal energy to a space as radio waves and receive incidence of radio waves from the outside. At least two antenna elements have directivity in the radiation and the incidence of the radio waves, respectively perform the radiation and the incidence of the radio waves to and from the leaky transmission lines corresponding thereto among the leaky transmission lines, and is set in directions in which the radio waves radiated and made incident to and from the leaky transmission lines do not cross each other.

Abstract: The present invention relates to a wireless communication device, such as a transponder, that has a plurality of antennas for multi-frequency usage. The wireless communication device comprises a control system, communication electronics, memory, and the aforementioned antennas. A wireless communication device having a pole antenna may be used with one or more loop conductor antennas to achieve the desired operating frequencies. A wireless communication device having a dipole antenna may be coupled across a loop conductor antenna to provide different loop conductor configurations depending on the frequency.

Abstract: The present invention relates to a wireless communication device, such as a transponder, that has a plurality of antennas for multi-frequency usage. The wireless communication device comprises a control system, communication electronics, memory, and the aforementioned antennas. A wireless communication device having a pole antenna may be used with one or more loop conductor antennas to achieve the desired operating frequencies. A wireless communication device having a dipole antenna may be coupled across a loop conductor antenna to provide different loop conductor configurations depending on the frequency.

Abstract: A traveling array antenna which operates at microwave/millimeter frequencies is disclosed in which a like number of radiator elements are arranged in two mirror image branches, an RF signal feed is fed through a 180 degree compensating power splitter to each branch of the antenna array, each of the radiator elements includes an impedance matching transformer connected at its input side and in which a radiator terminating patch is connected to the end of each of the two mirror image branches.

Abstract: A full aperture interleaved space duplexed beamshaped microstrip antenna system wherein the separate transmit and receive microstrip antennas each has respective arrays of radiating patch elements. Each of the antennas is fed from a single end thereof so that each antenna creates four beams. Beam pitch angles are introduced into each antenna so as to reduce the coupling between adjacent lines to allow the gap within each connected line pair to be reduced. This gap reduction provides room for the antennas to be interleaved within a common rectangular aperture so that the separate feeds are at opposite ends of the aperture. Each antenna then utilizes the entire aperture. Isolation elements are provided between the lines of the transmit and receive antennas so as to reduce the mutual coupling therebetween and maintain the minimum required sixty dB isolation.

Abstract: A space duplexed beamshaped microstrip antenna system including transmit and receive antennas, each of which has two groups of interleaved arrays. The array groups are slanted in opposite directions and each is fed from opposite corners of the antenna so that each group utilizes its entire assigned reduced width aperture to create the required beam contours for two beams. To achieve frequency and temperature compensation, one of the antennas is made up of forward firing arrays and the other of the antennas is made up of backward firing arrays.

Abstract: The antenna constituted by a plurality of identical parallel and symmetrical linear sub-networks (a7, a6, . . . a1, a'1, a'2, . . . , a'7). The centres of symmetry (b7, b.notident.b, . . . , b1, b'1, b'2 . . . , b'7) of the sub-networks (a7 to a'7) are aligned on a line (c) perpendicular to their diameter and are fed in phase. Each sub-network is constituted by a plurality of radiating elements in even numbers disposed at regular intervals and which radiate from fields displaced from 180.degree. from one radiating element to the following. The pitch of the sub-network is approximately equal to a wave-length guided on the substrate of the printed circuit. Each radiating element is a conducting square surface the side of which is approximately equal to half the guided wavelength with one corner connected galvanically to the feed line. The direction of the surfaces change from one element to the following element.

Abstract: A compressed feed is used in a microstrip antenna for reducing the spacing between adjacent tap points on the feed line such that sigma angle changes--due to temperature variations--of a radiating beam in a radar system are reduced.

Abstract: Two separate microstrip antennas are interleaved in the same plane thereby occupying substantially the same area as a single antenna. Each antenna aperture produces two beams and the configuration for each antenna includes a single feed on each planar array which results in lowered overwater bias error. Each planar array antenna can have radiating arrays of different radiator spacing. Using forward firing arrays for one antenna and backward firing arrays for the other antenna, a radiated spacing is chosen for each interleaved antenna which results in temperature compensation in the along track direction.

Abstract: A cross polarized wire grid antenna is disclosed which produces circularly polarized electromagnetic radiation. A subarray layer of the present invention comprises a plurality of interconnected rectangular elements. The elements are connected and fed so that the short sides of the rectangles serve essentially as radiating elements, and the long sides of the rectangles serve essentially as nonradiating transmission line elements. In an embodiment of the present invention, a first subarray comprises two layers of horizontally polarized radiators and a second subarray comprises two layers of vertically polarized radiators. The two subarrays are combined to form a cross-polarized antenna array which produces circularly polarized electromagnetic radiation. The layers of each subarray are electrically isolated from one another and are displaced 1/2.lambda. with respect to each other perpendicular to the direction of polarization of the subarray.

Abstract: An antenna including a conductive support for supporting a plurality of radiating elements in line next to one another above the conductive support and transmission lines serially connecting the radiating elements. The radiating elements of the loop or helix type with a turn length of substantially one wavelength at the operating frequency and configured to support the equivalent of a ring of current with a traveling wave to radiate circularly polarized radiation.