Abstract: Dielectric tube loaded metal cavity resonators and filters having a dielectric tube resonator extending substantially the full height of the metallic cavity are disclosed herein. The resonators and filters achieve low insertion loss in a size substantially smaller than conventional dielectric loaded resonators for equivalent quality factors. The dielectric tube resonators may be used with coaxial resonators to provide mixed resonator filter constructions.

Abstract: A dielectric loaded cavity filter having a housing and a cover and defining at least two adjacent cavities having respective dielectric resonators mounted therein and separated by a transverse partition defining a coupling window in the housing. In one form, the coupling window has two spaced opposing sidewalls confronting each other, and vertically offset shoulders intermediate their length. A conductive coupling strip is secured to the shoulder of one sidewall and extends across the coupling window and over the shoulder of the other sidewall. A tuning screw is secured by threading to the housing and has an outer free end accessible from the exterior of the filter, and an internal end disposed adjacent the coupling strip, whereby when the tuning screw is rotated, the internal end of the screw moves toward and away from the coupling strip in a direction perpendicular to the cover for tuning without requiring access to the coupling strip.

Abstract: A repeater allows terminals of a first communications system, employing a first air protocol or radio interface, to communicate with terminals of a second communications system, employing a second air protocol or radio interface different from the first. Where the first and second air protocols differ only in operating frequency, but are otherwise compatible, the repeater may linearly translate signals from the first operating frequency to the second operating frequency, and vice versa, without demodulating and remodulating the signals. Where the air protocols differ in other ways, the repeater receives and demodulates signals from the first system, converts the signals to a common format, and remodulates and retransmits the signals according to the second air protocol (and vice versa), in the same frequency bands or in different frequency bands.

Abstract: A dual-band glass-mounted antenna system includes a dual-band through-the-glass coupler, a matching section, and a dual-band collinear antenna element. The coupler has a portion which is secured to an interior surface of the glass, and a portion which is secured to the exterior surface of the glass at a position opposite the interior portion. Co-planer transmission line circuitry in the interior and exterior portions of the coupler cooperatively form a four-conductor transmission line operating in the “coupled microstrip line odd mode,” thereby achieving coupling of RF energy through the glass window material in two disparate frequency bands. The transmission line characteristics are selected to achieve efficient coupling and desired impedance characteristics in the cellular and PCS frequency bands. The dual-band antenna element includes upper and lower radiator sections separated by a phasing coil.

Abstract: In one form of the invention, a resonant cavity filter (50) is disclosed, comprising an input port (210) for receiving an input signal, a dielectric resonator (204) in a cavity, the dielectric resonator operable to receive an input signal from the input port and further operable to produce an output signal at a resonant frequency of the cavity, an output port (212) operable to receive the output signal and a tuning plate (308) disposed in the cavity, the tuning plate coupled to a control means operable to cause movement of the tuning plate, thereby changing dimensions of the cavity, the control means operable to determine a frequency of the input signal, retrieve an expected tuning plate position from a memory (514) based on the frequency, and move the tuning plate to the expected position. Other systems, devices and methods are disclosed.

Abstract: A method of selecting allocated communication channels for use by a cellular auxiliary personal communication system (CAPCS) comprising periodically collecting relative signal strength indication (RSSI) measurements for all allocated communication channels, periodically determining the estimated expected probability of non-interference for each allocated communication channel based on the relative signal strength indication measurements and selecting an available allocated communication channel having the highest estimated expected probability of non-interference for use by the CAPCS system. The relative signal strength indication measurements are made on the allocated communication channels by measuring the signal on the allocated communication channel when no call is being carried by the CAPCS on that channel.

Abstract: A low profile bi-directional antenna is provided for mounting directly to a metal structure, or some other conductive or semi-conductive surface. The antenna includes an insulating antenna tray, a conductive ground plane mounted to a surface of the antenna tray, first and second radiating elements extending from the ground plane, and a radome covering the radiating elements and fastened to the insulating antenna tray. First and second reflector elements are mounted to the surface of the antenna tray on the lateral sides of the ground plane. The reflectors are electrically connected to the ground plane. The radiating elements are supported above and to the lateral sides of the ground plane and reflector elements by support members mounted at acute angles to the ground plane. An RF connector is provided for coupling RF signals to and from the first and second radiating elements.

Abstract: A bracket assembly for fixedly mounting an RF antenna to a support structure while permitting azimuth adjustment comprising a first bracket member adapted for fixed securance to the support structure and having a forwardly extending plate defining a first bolt hole and a spaced away arcuate slot defined by a radius of curvature about the center of the first bolt hole. A second bracket member mounted to the first bracket member and adapted for mounting an antenna, the second bracket member providing second and third bolt holes; whereby when the first and second fasteners are loose, the second bolt may move along the length of the arcuate slot to adjust the angular relationship of the bracket members and when the fasteners are tightened, the angular relationship of the bracket members is fixed.

Abstract: A 45 degree polarization diversity antenna having improved beamwidth characteristics. The antenna includes a plurality of dipole sub-arrays each sub-array comprising four dipole elements arranged in a diamond shape. Two dipole elements in each sub-array are arranged at an angle of approximately plus 45 degrees from the earth's surface to form a plus 45 degree polarized dipole element array and the other two dipole elements are arranged at an angle of minus 45 degrees from the earth's surface to form a minus 45 degree polarized dipole element array. The dipole elements are arranged such that the phase centers of one plus 45 degree dipole element and one minus 45 degree element line up along a first substantially vertical line and the phase centers of the remaining plus 45 degree and minus 45 degree dipole element line up along a second substantially vertical line.

Abstract: A knock-down, reusable modular transmission line cable reel assembly having at least two side-by-side compartments for coiling transmission line, and including a pair of spaced apart, generally circular parallel end flanges, at least one intermediate, generally circular partition ring, a cable support core positioned between each end flange and adjacent partition ring and between each pair of adjacent partition rings, a plurality of tie rods extending between the pair of end flanges, extending through the cable support cores, and extending through the partition rings, and releasable fasteners secured to the tie rods for biasing the end flanges, partition rings and support cores towards each other in an assembled array, and so that when the fasteners are released, the end flanges, partition rings, support cores and tie rods are easily separated for transport in a knocked-down form for reassembly and reuse.

Abstract: An antenna assembly having an operating frequency and a vertical radiation pattern with a main lobe axis defining a downtilt angle with respect to the earth's surface. The antenna assembly comprises a plurality of antennas in first, second, and third antenna groups disposed along a backplane, the backplane having a longitudinal axis along which the antennas are disposed, and a phase adjustment mechanism disposed between the second and third antenna groups, such that adjustment of the phase adjustment mechanism results in variation of the vertical radiation pattern downtilt angle.

Abstract: A hybrid logarithmic yagi antenna system characterized by the absence of a balun or other conventional log periodic yagi antenna system balanced feed and impedance matching element. The reflector element is configured as a supporting conductive tray which provides a rugged mounting mechanism for mounting the antenna system, at its reflector end, to a support structure such as a building.

Abstract: A dual polarized aperture coupled patch antenna system having a back plate, a ground plane and a patch plane. The patch plane has a conductive patch layer forming a plurality of conductive patches on one side. The ground plane has a slot layer on one side and a microstrip feed network layer on the opposite side. The ground plate is positioned between the patch plane and the back plate, with the slot layer confronting the conductive patch layer of the patch plane and the microstrip feed network layer confronting the back plate. The slot layer comprises a conducting coating having a plurality of intersecting polarization slot pairs etched into the coating. The microstrip feed network layer comprises two feed lines and a plurality of feed probes. Two feed probe members are coupled to each conductive patch through one arm of each slot pair and one feed probe member is coupled to each conductive patch through each other slot pair.

Abstract: A tuning assembly for an RF filter having an internal cavity. The tuning assembly is mounted on one of the filter walls and comprises an adjustment screw threadedly secured in the wall and having an inner end in the cavity and an outer free end external of the wall, a generally circular tuning plate, and a formed in situ molded connector fixedly securing the tuning plate to the inner end of the screw and for preventing relative movement therebetween. A formation is provided at the free end of the adjustment screw for facilitating rotation of the adjustment screw relative to the wall so that the tuning plate may be moved within the cavity toward and away from the wall.

Abstract: A dielectric resonator loaded cavity filter comprises a housing having an exterior and an interior, the housing interior including at least two adjacent cavities having dielectric resonators mounted therein. The adjacent cavities are separated by a transverse partition having a coupling window therein, the coupling window having first and second spaced opposing sidewalls. In one embodiment a coupling disk is interposed between opposing sidewalls of the transverse partition. In another embodiment a coupling strip extends from a shoulder portion of a first opposing sidewall toward a shoulder portion of a second opposing sidewall.

Abstract: An electromagnetic bandstop filter comprises a microwave circuit, at least one microwave resonator, coupling means that couples electromagnetic energy to and from the microwave resonator, and an impedance transformer coupled to, and in series with, the coupling means, wherein the transformer is coupled to the resonator only through the coupling means, and wherein the impedance transformer is shunt coupled to the microwave circuit. The impedance transformer comprises at least two series-connected transmission line sections of different impedances.

Abstract: A system and method for distribution of RF communication signals. First RF communication signals are downconverted in a first signal processing subsystem and transmitted to a second signal processing subsystem via twisted-pair cable. The downconverted first RF communication signals are upconverted at the second signal processing subsystem to provide recovered first RF communication signals, and the recovered first RF communication signals are transmitted via an antenna. Operating power for the second signal processing subsystem is provided from the signal processing subsystem, and the second signal processing subsystem determines the occurrence of an event and transmits autonomous information signals thereabout to the first signal processing subsystem.