Abstract: A feed assembly and feed support arm for parabolic antennas with circular or linear polarization is provided in a streamlined configuration. The feed assembly contains a septum polarizer with parallel transmit and receive ports, or a similarly configured ortho-mode transducer. Through a common waveguide transition, the ports connect to transmit and receive filters joined together in parallel to form a square-profile structure that serves as the feed support arm. The receive filter terminates in a low noise block downconverter while the transmit filter connects to a waveguide flange at the base of the reflector, which is the output port of an up-converter/power amplifier mounted behind the reflector. Alternatively, the power amplifier is integrated into the feed support arm, connecting to the rest of the transmitter behind the reflector.

Abstract: An antenna apparatus for use in a transmitter or a receiver in a communication system. The antenna apparatus includes: a dielectric substrate having a conductor layer on one of surfaces; and a slot antenna including an antenna electrode formed on the one surface and disposed substantially at the center, a grounded conductive surface surrounding the antenna electrode, and a slot transmission line made by a gap between the antenna electrode and the grounded conductive surface.

Abstract: A coupling device is provided, including a substrate, a ground element, a first feed conductor and a second feed conductor. The substrate includes a first surface and a second surface. The ground element is disposed on the second surface, wherein the ground element includes a first portion, a second portion, an annular groove and a feed slot, the annular groove is located between the first portion and the second portion, enclosing the first portion, and a first end of the feed slot is connected to the annular groove. The first feed conductor is disposed on the first surface corresponding to the annular groove, wherein the first feed conductor couples the ground element to feed a current signal. The second feed conductor is disposed on the first surface corresponding to the feed slot, wherein second feed conductor couples the feed slot to feed a magnetic current.

Abstract: An antenna structure consists of a substrate, a radiation element, a signal feeding element, and a grounding element. The radiation element includes a first radiator and a second radiator coupled to the first radiator, wherein the first radiator is identical to the second radiator. The signal feeding element is coupled to a joint of the first radiator and the second radiator, wherein the first radiator and the second radiator are symmetrically disposed in the left and right sides of the signal feeding element to permute an array. The grounding element includes a first grounding sub-element and a second grounding sub-element, wherein the first grounding sub-element is coupled between the first radiator and the substrate and the second grounding sub-element is coupled between the second radiator and the substrate. The first grounding sub-element is identical to the second grounding sub-element.

Abstract: A dual polarized reflector antenna assembly, provided with a reflector dish coupled to a feed hub with a feed port there through; a transceiver support bracket coupled to a backside of the feed hub; a circular to square waveguide transition coupled to the feed port; a square waveguide coupled to the circular to square waveguide transition; an OMT coupled to the square waveguide; the OMT provided with an OMT intersection between a square waveguide and a pair of rectangular waveguides oriented at ninety degrees to one another, an output port of each rectangular waveguide arranged normal to a longitudinal axis of the dual polarized reflector antenna assembly. Alternatively, a circular waveguide may be applied between the feed port and the circular to square waveguide transition, eliminating the square waveguide, or the rectangular waveguides may be extended longitudinally, also eliminating the square waveguide.

Abstract: Dual band antenna systems and methods providing isolation between bands are provided. The system includes a pair of superimposed antenna radiating elements, each of which is connected to an associated feed network. The feed networks may comprise a quadrature hybrid networks. Coupling paths between the first and second feed networks are arranged such that a first component of a first signal coupled from a first feed network to a second feed network will be 180° out of phase with a second signal component of the first signal coupled from the first feed network to the second feed network at the input/output of the second feed network. The resulting destructive interference results in isolation between the bands.

Abstract: A dual-band antenna is provided that combines two normally disparate communications modes into a single compact aperture minimizing overall mass and volume, while maintaining high performance efficiency and reciprocity of each individual mode. The antenna is compatible with both optical (near-IR/visible) and RF (microwave/millimeter-wave) transceiver subsystems for high bandwidth communications, applicable primarily to long- to extremely long-range (space-to-ground) link distances. The optical link provides high bandwidth while the RF provides a lower data-rate weather backup, accommodation for traditional navigation techniques, and assistance in cueing the extremely tight optical beam by matching the RF beamwidth to an optical fine-steering mechanism field-of-regard. The configuration is built around a near-diffraction-limited high performance primary mirror shared by both a direct-fed RF antenna design and a Cassegrain optical telescope.

Abstract: A system and method of minimizing a polarization quantization error associated with an antenna sub-array. The antenna sub-array includes at least two radiating elements, with the radiating elements having different polarization orientations from other radiating elements in the antenna sub-array. The radiating elements are dual polarized and have electronic polarization control. In an exemplary embodiment, the radiating elements are configured to reduce the polarization quantization error to be less than half of a polarization quantization step size. In various embodiments, rotating the radiating elements and implementing a phase delay, individually or in combination, is used to change the polarizations of the radiating elements.

Abstract: An antenna device according to this invention having: a transmission antenna which is the first antenna element formed on a surface of a substrate; and a receiving antenna which is the second antenna element formed on the surface of the substrate includes a photonic crystal structure between the transmission antenna which is the first antenna element and the receiving antenna which is the second antenna element.

Abstract: Provided is an antenna system with high isolation. The high-isolation antenna has transmission ports of a transmission antenna and reception ports of a reception antenna highly isolated from each other by using quadrature hybrid couplers. The antenna system includes: a transmission antenna having two feed points for transmitting signals; a reception antenna having two feed points for receiving signals; a transmission hybrid coupler which is connected to the two feed points of the transmission antenna and transmits transmission signals which have a phase difference of 90° with each other; and a reception hybrid coupler which is connected to the two feed points of the reception antenna and receives reception signals which have a phase difference of 90° with each other. The signals leaking from the two feed points of the transmission antenna to the two feed points of the reception antenna are offset.

Abstract: A cup waveguide antenna with integrated polarizer and OMT for simultaneously communicating left and right hand circularly polarized electromagnetic waves is adjustable to obtain efficient propagation and reception of electromagnetic waves. The antenna includes a circular waveguide having an orthomode transducer utilizing first and second pins longitudinally spaced apart and oriented orthogonally with respect to each other. Six radially-oriented adjustable polarizer screws extend from the exterior to the interior of the waveguide. A septum intermediate the first and second pins is aligned with the first pin. Adjustment of the polarizer screws enables maximized propagation of and/or response to left hand circularly polarized electromagnetic waves by the first pin while simultaneously enabling maximized propagation of and/or response to right hand circularly polarized electromagnetic waves by the second pin.

Abstract: A coupling device is provided. The coupling device has a substrate, a ground element, a first feed conductor and a second feed conductor. The substrate has a first surface and a second surface. The ground element is disposed on the second surface, wherein the ground element has a first annular groove, a second annular groove and a feed slot, the second annular groove surrounds the first annular groove, the feed slot is connected to the first annular groove and the second annular groove. The first feed conductor is disposed on the first surface corresponding to the first annular groove and the second annular groove, wherein the first feed conductor couples the ground element to feed an electric current. The second feed conductor is disposed on the first surface corresponding to the feed slot, wherein the second feed conductor couples the feed slot to feed a magnetic current.

Abstract: A communication system including an antenna array with feed network coupled to communication electronics. In one example, a communication subsystem comprises a plurality of antennas each adapted to receive an information signal and a plurality of orthomode transducers coupled to corresponding ones of the plurality of antennas, each OMT is adapted to provide at a first component signal having a first polarization and a second component signal having a second polarization. The communication subsystem also comprises a feed network that receives the first component signal and the second component signal from each orthomode transducer and provides a first summed component signal at a first feed port and a second summed component signal at a second feed port, and a phase correction device coupled to the first and second feed ports and adapted to phase match the first summed component signal with the second summed component signal.

Abstract: The system contains an antenna feed. A signal is in communication with the antenna feed. The signal has a wavelength and a period. A signal lens has a periphery portion that is thicker than an interior portion, wherein the signal propagates through the signal lens. The signal lens is designed such that the signal propagates through the periphery portion of the signal lens approximately one wavelength slower than through the interior portion of the signal lens.

Abstract: An antenna having two frequency-selective surfaces is disclosed. The antenna includes a first frequency-selective surface (FSS) having multiple holes to form a mesh, a second FSS having a multiple holes to form a mesh, and a perfect electric conductor located between the first FSS and the second FSS.

Abstract: Methods and apparatus for a feed assembly for a reflector antenna including an aperture common to low, mid, and high frequency bands, a polyrod design to launch signals in the mid and high frequency bands, a horn to launch signals in the low frequency band, a co-located phase center for launching signals in the low, mid, and high frequency bands, and a low-band monopulse array located on a surface about the aperture to track a satellite.

Abstract: An access point is provided with an electronics enclosure which is surrounded by antenna panels. An antenna feeding mechanism operates using spatial multiplexing multiple input multiple output. Three radio frequency chains are used in a pattern that feeds a total of eight antenna elements. Multiple streams are supported by using two polarizations. Additionally a maximal ratio combiner is used to combine signals from different antennas. The hardware within the access point supports three radio frequency chains which are mapped to four antenna panels, each panel containing two elements; one for vertical and one for horizontal polarization.

Abstract: A multi-band transducer is described incorporating a coaxial waveguide interface for use with a multi-band feed and incorporating bent shaped probes yielding all-planar interfaces in microstrip for all frequency ranges and suitable for mass production. Hybrids can be incorporated for linear or circular polarization applications.

Abstract: A circularly polarized antenna in a wireless communication system includes: at least one feed antenna positioned at a predetermined point on at least one ground substrate; and a unit antenna having a plurality of conductive structures arranged in a predetermined identical direction on a superstrate positioned at a predetermined distance from above the feed antenna. The plurality of conductive structures and the unit antenna are configured to radiate circularly polarized waves, respectively, when the feed antenna radiates linearly polarized waves.

Abstract: A radio wave receiving converter includes a main body portion including a first waveguide having a male thread on an outer circumference of the first waveguide, a feedhorn including a second waveguide having a female thread on an inner circumference of the second waveguide, a ring-shaped member including a circumferential wall portion and an annular step portion such that a groove portion where a portion near a tip of the second waveguide is inserted between the ring-shaped member and the outer circumference of the first waveguide is formed, and a sealing agent injected into a groove portion “b”. By this configuration, there is provided a radio wave receiving converter that has a simple structure of a connecting portion, has improved productivity of the components and assemblability of the finished components, and can achieve a reduction in size and weight.

Abstract: In accordance with various aspects of the present invention, a method and system for electro-mechanical polarization switching in an antenna system is presented. The antenna system may comprise an integrated waveguide in a transceiver housing, where the waveguide has at least four channels. In an exemplary embodiment, a sliding switch is incorporated into the waveguide. The sliding switch is configured to switch the polarization of the antenna system by physically realigning the waveguide channels. The sliding switch may be electro-magnetically controlled. Furthermore, the polarization switching may be performed to assist in load balancing for a particular frequency and/or polarization combination.

Abstract: A switchable microwave fluidic polarizer is provided. In one embodiment, the invention relates to a switchable polarizer for polarizing radio frequency (RF) signals associated with an antenna, the switchable polarizer including a plurality of radiating elements, an RF feed coupled to the plurality of radiating elements, an antenna input coupled to the RF feed, and an antenna cover disposed in proximity to the plurality of radiating elements, the antenna cover including a dielectric substrate including a plurality of channels for enclosing a liquid metal.

Abstract: A ground station antenna includes a LNB with at least one dipole, a feed horn, a waveguide between the LNB and the feed horn, and a rotation mechanism. By rotating a portion of the waveguide, the polarization of an electromagnetic wave propagating between the LNB and a satellite is transformed to match the polarization to (one of) the dipole(s) and to an antenna on the satellite. Another ground station antenna includes a main waveguide, two mutually orthogonal branch waveguides, a coupling mechanism for coupling two orthogonal antenna dipoles to the proximal end of the waveguide, and a transformation mechanism that transforms the polarization of an electromagnetic wave propagating between the branch waveguides and a satellite via the antenna dipoles to match the polarization to one of the branch waveguides and to an antenna on the satellite.

Abstract: A polarizer includes a waveguide channel having a substantially square cross section and a septum disposed within the waveguide channel. The septum includes a stepped edge and two opposite stepped surfaces. The stepped surfaces are sectionally recessed toward each other along the direction pointing toward the interior of the waveguide channel, wherein the number of the steps of the stepped surface is greater than two, but smaller than the number of the steps of the stepped edge. In one embodiment, the square cross section may include a plurality of rounded corners and a plurality of edges extending correspondingly between the rounded corners, wherein the ratio of the radius of the rounded corner to the distance between two opposite edges is in a range of from 0.05 to 0.3.

Abstract: An antenna feed assembly is provided which includes at least two elongate feed chains lying adjacent one another. Each feed chain is adapted to transmit or receive electromagnetic radiation between itself and the antenna along a longitudinal feed axis thereof via a transmit/receive element. The feed chains are held in fixed lateral relationship to one another by first and second mountings spaced apart axially of the feed chains. The transmit/receive elements extend axially from the first mounting towards the antenna and the second mounting is positioned on a side of the first mounting remote from the antenna. The first mounting has a lower coefficient of thermal expansion in the lateral direction than the second mounting whereby translational movement of each transmit/receive element in the lateral direction owing to temperature change of the assembly will be reduced.

Abstract: The present invention relates to a dual-feed antenna. The invention provides an antenna comprising first and second electromagnetic radiation paths which join to form a common third electromagnetic radiation path, wherein the first path is rotatable with respect to the second path. In this way, two antenna feeds can be directed independently of one another, whilst combining the electromagnetic radiation paths from the antenna feeds then allows a common set of components to be used in signal analysis or generation.

Abstract: A planar scanning antenna is configured for scanning and tracking. In one embodiment, the planar scanning antenna may include a transducer module configured to provide an electromagnetic beam. According to another aspect of the invention, the apparatus may include a first planar dielectric element having an axis of rotation and configured to direct an electromagnetic beam. In one embodiment, a second planar dielectric element oriented adjacent to the first planar dielectric element and having the axis of rotation may be configured to direct electromagnetic energy. The apparatus may further include a mounting structure arranging the transducer module and the first and second planar dielectric elements. In yet another embodiment, the apparatus may include a drive means for positioning the first planar dielectric element independently from the second planar dielectric element.

Abstract: A coupling device is provided. The coupling device has a substrate, a ground element, a first feed conductor and a second feed conductor. The substrate has a first surface and a second surface. The ground element is disposed on the second surface, wherein the ground element has a first annular groove, a second annular groove and a feed slot, the second annular groove surrounds the first annular groove, the feed slot is connected to the first annular groove and the second annular groove. The first feed conductor is disposed on the first surface corresponding to the first annular groove and the second annular groove, wherein the first feed conductor couples the ground element to feed an electric current. The second feed conductor is disposed on the first surface corresponding to the feed slot, wherein the second feed conductor couples the feed slot to feed a magnetic current.

Abstract: The present invention relates to a dual-feed antenna. The invention provides an antenna comprising first and second electromagnetic radiation paths which join to form a common third electromagnetic radiation path, wherein the first path is rotatable with respect to the second path. In this way, two antenna feeds can be directed independently of one another, whilst combining the electromagnetic radiation paths from the antenna feeds then allows a common set of components to be used in signal analysis or generation.

Abstract: An antenna and a method of creating multiple polarization states in an antenna comprising providing to the antenna a single power input, dividing the power received from the single power input, and transmitting the divided power to a radiating element via a plurality of transmission lines.

Abstract: In an exemplary embodiment, a phased array antenna comprises a bidirectional antenna polarizer and is configured for bidirectional operation. The bidirectional antenna polarizer may combine active implementations of power splitters, power combiners, and phase shifters. Furthermore, in another exemplary embodiment a bidirectional antenna polarizer has extensive system flexibility and field reconfigurability. In yet another exemplary embodiment, the bidirectional phased array antenna operates in “radar-like” applications where the transmit and receive functions operate in half-duplex fashion. Furthermore, in exemplary embodiments, the phased array antenna is configured to operate over multiple frequency bands and/or multiple polarizations.

Abstract: In an exemplary embodiment, a phased array antenna comprises multiple subcircuits in communication with multiple radiating elements. The radio frequency signals are adjusted for both polarization control and beam steering. In a receive embodiment, multiple RF signals are received and combined into at least one receive beam output. In a transmit embodiment, at least one transmit beam input is divided and transmitted through multiple radiating elements. In an exemplary embodiment, the phased array antenna provides multi-beam formation over multiple operating frequency bands. The wideband nature of the active components allows for operation over multiple frequency bands simultaneously. Furthermore, the antenna polarization may be static or dynamically controlled at the subarray or radiating element level.

Abstract: A system and method of minimizing a polarization quantization error associated with an antenna sub-array. The antenna sub-array includes at least two radiating elements, with the radiating elements having different polarization orientations from other radiating elements in the antenna sub-array. The radiating elements are dual polarized and have electronic polarization control. In an exemplary embodiment, the radiating elements are configured to reduce the polarization quantization error to be less than half of a polarization quantization step size. In various embodiments, rotating the radiating elements and implementing a phase delay, individually or in combination, is used to change the polarizations of the radiating elements.

Abstract: The invention relates to a device for controlling the specific absorption rate of mass-produced radiant objects. The inventive device is characterized in that it comprises: at least one sensor for measuring a power radiated by an object which is located in the zone, and at least one processing unit for analyzing the power thus measured. The aforementioned sensor consist of a waveguide comprising an opening which is disposed opposite the test zone and at least one measuring probe which is disposed inside the waveguide.

Abstract: An antenna structure consists of a substrate, a radiation element, a signal feeding element, and a grounding element. The radiation element includes a first radiator and a second radiator coupled to the first radiator, wherein the first radiator is identical to the second radiator. The signal feeding element is coupled to a joint of the first radiator and the second radiator, wherein the first radiator and the second radiator are symmetrically disposed in the left and right sides of the signal feeding element to permute an array. The grounding element includes a first grounding sub-element and a second grounding sub-element, wherein the first grounding sub-element is coupled between the first radiator and the substrate and the second grounding sub-element is coupled between the second radiator and the substrate. The first grounding sub-element is identical to the second grounding sub-element.

Abstract: Multi-band antennas for simultaneously communicating linear polarity low-band signals and circular polarity high-band signals via a single antenna horn structure. The antennas horn structures have circular and oblong cross-sections. Strategic location and orientation of low-band and high-band ports with respect to internal ridges in transition sections and the major and minor axes of the oblong horn allows the antenna to simultaneously manipulate the high-band circular polarity signal without affecting the linear polarity low-band signals. The oblong horn shape and ridges may apply additive or oppositely sloped differential phase shifts to the linear components of the circular polarity high-band signal. For the horns with circular cross-section, the internal ridges may apply additive or oppositely sloped differential phase shifts to polarize the circular polarity high band signals without assistance from the internal shape of the horn.

Abstract: A communications system including an antenna array and electronics assembly that may be mounted on and in a vehicle. The communication system may generally comprise an external subassembly that is mounted on an exterior surface of the vehicle, and an internal subassembly that is located within the vehicle, the external and internal subassemblies being communicatively coupled to one another. The external subassembly may comprise the antenna array as well as mounting equipment and steering actuators to move the antenna array in azimuth, elevation and polarization (for example, to track a satellite or other signal source). The internal subassembly may comprise most of the electronics associated with the communication system.

Abstract: A method and apparatus for a polarizer. The apparatus comprises a dielectric rod, a first array of slots, and a second array of slots. The first array of slots and the second array of slots are formed in sidewalls of the dielectric rod. The first array of slots is substantially opposite to the second array of slots. The first array of slots and the second array of slots are configured to shift a first component orthogonal to a second component in a signal traveling through the dielectric rod by around 90 degrees with respect to each other. The dielectric rod may be a solid material or comprised of layers of dielectric substrates with metal tabs.

Abstract: A compact excitation assembly for generating a circular polarization in an antenna in particular transmit and/or receive antennas such as multibeam antennas comprises a diplexing orthomode transducer and a branched coupler and is characterized in that the orthomode transducer (21), or OMT, is asymmetric and comprises a main waveguide (22) with square or circular cross section and longitudinal axis ZZ? and two branches coupled to the main waveguide (22) by respectively two parallel coupling slots (25, 26), the two coupling slots (25, 26) being made in two orthogonal walls of the waveguide, the two branches of the OMT being respectively linked to two waveguides (35, 36) of an unbalanced branched coupler (40), the branched coupler (40) having two different splitting coefficients (?,?) that are optimized in such a way as to compensate for the electric field orthogonal spurious components (?y, ?x) produced by the asymmetry of the OMT (21).

Abstract: A bandpass radome is described including inductive layers comprising periodic conductive grids. First and second capacitive patch layers may be disposed above, and third and fourth capacitive patch layers may be disposed below the inductive layer to realize a 2-pole bandpass radome. An additional inductive layer and a fifth and sixth capacitive patch layers may be added below the fourth capacitive layer to realize a 3-pole bandpass radome. Conductive posts may connect one of the uppermost patch layers to one of the lowermost patch layers without connecting to the intervening inductive conductive grids. The conductive posts may form a rodded medium to suppress transverse magnetic (TM) surface waves. The total thickness of the bandpass radome may be less than 1/30 of a free-space wavelength at the center of a passband frequency. More than one passband may be separated by a ratio of center frequencies exceeding 1.5.

Abstract: A streamlined feed assembly and feed support arm for parabolic antennas with circular or linear polarization is disclosed and claimed. The feed assembly contains a septum polarizer with parallel transmit and receive ports, or a similarly configured ortho-mode transducer. Through a common waveguide transition, the ports connect to transmit and receive filters joined together in parallel to form a square-profile structure that serves as the feed support arm. The receive filter terminates in a low noise block downconverter while the transmit filter connects to a waveguide flange at the base of the reflector, which is the output port of an up-converter/power amplifier mounted behind the reflector. Alternatively, the power amplifier is integrated into the feed support arm, connecting to the rest of the transmitter behind the reflector.

Abstract: Controlling an antenna's polarization sense. An antenna system includes a polarized antenna and a mechanism for controlling the polarization sense of the antenna. The controlling mechanism can include rotatable polarizer panels disposed between the antenna's aperture and the antenna's target. The polarizer panels are rotated to switch between polarization senses. The polarizer panels can comprise meander line polarizers that convert the polarization sense of a linear polarized antenna to a circularly polarized antenna and vice-versa. The meander line polarizers can be rotated from a position in which the meander line polarizer panels convert between linear polarization and right-hand-circular (“RHC”) polarization to a position that converts between linear polarization and left-hand-circular (“LHC”) polarization. The polarizer panels can be rotated using a mechanical system that rotates the polarizer panels based on a signal received from a remote device.

Abstract: The disclosed system, device and method for a signal modulation apparatus generally includes a first signal generator suitably configured to generate a first continuous wave radio frequency (RF) signal, and a second signal generator suitably configured to generate a second continuous wave RF signal. A dual-circular polarized antenna may be adapted to receive the first continuous wave RF signal into a right-hand port and the second continuous wave RF signal into a left-hand port, where the signals are combined into a modulated RF signal in the dual-circular polarized antenna.

Abstract: A system 10 that includes a first satellite 14 at a first orbital slot B includes a first transponder 32 generating a first downlink signal at a first frequency and a second downlink signal at a second frequency. An outdoor unit 50 is directed toward the first satellite 14. The outdoor unit includes a support structure 80 and a reflector 64 coupled to the support structure 80 and reflecting the first downlink signal from a first satellite. A first reflector reflects the second downlink signal from the first satellite. A first feed 66 is coupled to the support structure and receives the first downlink signal. A reflector 72 having frequency selective surface 74 coupled to the support structure 80 reflects the second downlink signal and passes the first downlink signal therethrough. The second feed 70B is coupled to the support structure 80 and receives the second downlink signal reflected from the frequency selective surface 74.

Abstract: To provide a dual polarized antenna capable of reducing correlation between antenna elements. A dual polarized antenna is constituted by a vertically polarized antenna and a horizontally polarized antenna formed on a printed circuit board and radiates two kinds of polarized waves.

Abstract: A polarization switching antenna device capable of switching a polarization without increase of an antenna installing space and also handling a variety of frequency bands is provided. A connection state of one end of a loop antenna element arranged on a side surface of a case is switched. Thus, the polarization characteristic is switched by switching selectively whether the antenna element should constitute a loop antenna or a linear antenna. Matching circuits suitable for respective characteristics are provided. The loop antenna can be fed in terms of a balanced feeding. A balanced feeding and an unbalanced feeding can be switched.

Abstract: A radio wave receiving converter is provided with a circular waveguide unit to which a vertically-polarized wave and a horizontally-polarized wave are input, first and second board holding units provided on the upside and the downside of the circular waveguide unit and holding first and second circuit boards, respectively, and first and second feed probes having tip portions provided to protrude into a waveguide element in parallel with the vertically-polarized wave and the horizontally-polarized wave, respectively, and having proximal end portions connected to the first and second circuit boards, respectively. Accordingly, the first and second board holding units are provided on the upside and the downside of the circular waveguide unit, and thus there is no need to use a sliding insert in the design of a die, so that the die can easily be fabricated at low cost.

Abstract: Methods and apparatus for using multiple antennas having different polarizations are described. Polarized antennas are advantageously deployed in a cellular network. Some of the sectors utilize an antenna with a first direction polarization, while other sectors use an antenna with a second direction polarization, for a given carrier. Various embodiments are directed to methods and apparatus related to base station deployment which set up and/or operate base stations in accordance with an advantageous reuse pattern from the perspective of inter-cell and/or inter-sector interference. In some embodiments a plurality of carriers are used in addition to a plurality of different polarization direction antennas. In some such embodiments, a base station is configured so that for a given sector different carriers are associated with different direction polarization antennas. Some embodiments are directed to multi-sector base station implementations.

Abstract: Methods and apparatus for supporting the communication of an information stream using an individual polarization type are described. For example, a first data stream is communicated from a base station sector transmitter using horizontal polarization signals and a second data stream is communicated using vertical polarization signals. A mobile wireless communications device, employing a plurality of dipole antennas associated with different direction polarizations, e.g., a first direction horizontal polarization dipole antenna, a second direction horizontal polarization dipole antenna and a vertical polarization dipole antenna, multiple receiver modules, and a combiner module, facilitates the recovery of horizontal polarization signals without the need for azimuth antenna orienting or repositioning, and also facilitates the recovery of vertical polarization signals.

Abstract: The present invention provides a radome for an endfire antenna array that includes a honeycomb core, an inner skin attached to the honeycomb core, a first set of conductive slats disposed on the inner skin of the honeycomb core and a second set of conductive slats that are disposed within the honeycomb core. The two sets of conductive slats are capacitively-coupled to one another.