Abstract: A covert antenna or radio frequency probe assembly for a motor vehicle includes a substantially planar antenna or probe element including a sheet of electrically conductive material, a first dielectric substrate, and a second dielectric substrate. A connector is coupled to the antenna element and is adapted to supply electrical energy to the antenna or probe element from an electrical power source. The antenna or probe element is disposed between the first substrate and the second substrate, and the first substrate is bonded to the second substrate to form a substantially planar antenna or probe assembly. The antenna or probe assembly has the form of a motor vehicle mud guard or another substantially planar motor vehicle component.

Abstract: The present invention discloses a system and method by which radio transceiver equipment may be coupled to antenna equipment polarized in either of two orthogonal polarizations without requiring any adaptation or additional componentry while providing the same signal path attributes irrespective of the polarization chosen. Accordingly, a single transceiver/antenna unit may be utilized for providing communications polarized vertically, or slant right, and polarized horizontally, or slant left.

Abstract: The present invention discloses a system and method by which radio transceiver equipment may be coupled to antenna equipment polarized in either of two orthogonal polarizations without requiring any adaptation or additional componentry while providing the same signal path attributes irrespective of the polarization chosen. Accordingly, a single transceiver/antenna unit may be utilized for providing communications polarized vertically, or slant right, and polarized horizontally, or slant left.

Abstract: The present invention discloses a system and method by which radio transceiver equipment may be coupled to antenna equipment polarized in either of two orthogonal polarizations without requiring any adaptation or additional componentry while providing the same signal path attributes irrespective of the polarization chosen. Accordingly, a single transceiver/antenna unit may be utilized for providing communications polarized vertically, or slant right, and polarized horizontally, or slant left.

Abstract: A phased-array antenna structure is provided that includes an antenna waveguide structure with a plurality of waveguides. The antenna waveguide structure propagates the received or transmitted electromagnetic (EM) signals within the plurality of waveguides to a corresponding active array module. Each active array module amplifies and adjusts the phase of a received or transmitted EM signal. The active array modules are coupled to an interconnect structure that provides EM signal propagation paths, as well as power and digital signal paths, to and from the active array modules. A plate is coupled to the interconnect structure and the antenna waveguide structure to support the antenna waveguide structure, the electronic modules, and the interconnect structure, thereby forming a rigid unit and keeping the electronic modules in alignment with their corresponding waveguides in the antenna waveguide structure.

Abstract: A mist cooled distributed amplifier utilizing a connectorless module. The amplifier comprises modules that are connected to waveguides in a honeycomb. The RF signals are distributed to and combined from the modules using a distributed waveguide manifold. Cooling is accomplished by forming channels between the modules through which mist is transmitted and collected and condensed at the output end.

Abstract: A monopulse comparator receives an incoming RF signal through a multimode antenna and splits it into a first-half signal that corresponds to the incoming RF signal as received by one half of the antenna and a second-half signal that corresponds to the incoming RF signal as received by the other half of the antenna. A folded magic tee selectively separates an unsymmetric mode component signal and a symmetric mode component signal from the first-half signal. In one embodiment, the unsymmetric mode component signal is the TE.sub.2,0 mode and the symmetric mode component signal is the TE.sub.1,0 mode. The energy of the TE.sub.2,0 mode signal is dependent on .DELTA.AZ information of the incoming RF signal relative to the antenna's boresight. The TE.sub.1,0 mode contains the .SIGMA. and .DELTA.EL signals. A second folded magic tee selectively separates the corresponding unsymmetrical and symmetrical mode component signals of the second-half signal. Waveguide-to-microstrip transition circuits transition the TE.sub.

Abstract: A dually polarized monopulse feed system for processing radar signal information from a target so the target may be identified and tracked includes a symmetrical multimode input waveguide, a coupler for separating polarized modes of signal waves to identify and track the target, waveguides for rejecting and terminating selected polarized modes of signal waves, and a backshort for reflecting selected polarized modes of signal waves.

Abstract: A waveguide-to-microstrip transition module transmits captured electromagnetic energy between a waveguide and signal processing circuitry. The module is an assembly of a base which includes at least one waveguide, a circuit board having one side mounted to the base and the opposite side including at least one microstrip. The microstrip is simultaneously connected to signal processing circuitry and oriented with each waveguide. A backshort is associated with each microstrip. The module further includes a housing bonded to and containing, the base and circuit board. A cover is hermetically sealed to the housing to enclose the circuit board in the housing.

Abstract: A feedback linearization technique for a power amplifier that does not require the availability of the modulation signals. The RF input signal is down converted to a first IF signal. A portion of the amplifier RF output signal is used to form a feedback signal that is down converted to produce a second IF signal that is subtracted from the first IF signal to produce a different signal. The difference signal is filtered and amplified, and then up converted to RF for input to the power amplifier. Use of feedback at IF avoids stability problems inherent in RF feedback techniques.