Rockwell Collins, Inc.

Rockwell International Corporation

Other

Richard A Freeman

Robert Newgard

James B West

Lee M Paulsen

David A Gribble

Roger K Loper

Roy W Berquist

Manas K Roy

The present invention is directed to an integrated antenna and feed network assembly. The integrated antenna and feed network assembly includes a spiral antenna which is suitable for implementation with ELINT DF systems. The integrated antenna and feed network assembly further includes a feed network, which may include a stripline Balun feed. The feed network is electrically connected to the antenna. Further, the integrated antenna and the feed network assembly provides for integration of the antenna and the feed network into a single PCB assembly.

PCB spiral antenna and feed network for ELINT applications

The present invention is a MEMS-based broadband transceiver/sensor. A MEMS-based transceiver/sensor in accordance with the present invention may comprise: (a) an antenna; (b) a front-end triplexer block; (c) a plurality of N transceiving channels; and (d) an RF energy sensor. The front end triplexer block may comprise M triplexers, each triplexer having MEMS-based filters. The transceiving channels may each comprise: (i) a local oscillator; (ii) a mixer; (iii) a first N:1 MEMS-based switch; (iv) a plurality of N MEMS-based variable bandwidth bandpass filters; and (v) a second N:1 MEMS-based switch. The RF energy sensor may comprise: (vi) an M:1 MEMS-based switch; (vii) a local oscillator; (viii) a mixer; and (ix) a plurality of MEMS-based variable bandwidth bandpass filters.

MEMS-based broadband transceiver/sensor

An integrated frequency source with an integrated frequency standard and an integrated frequency synthesizer is disclosed. A voltage-controlled oscillator in the frequency standard is eliminated with a resulting improvement in phase noise. A reference frequency in the frequency standard is provided directly to the frequency synthesizer. The integrated frequency source is put on frequency over temperature by storing reference frequency errors over temperature in a lookup table, measuring the temperature, and calculating in a microprocessor synthesizer control data that offsets the synthesizer to compensate for reference frequency errors.

Integrated frequency source

A phase locked filter can utilize a divider to provide a source signal. The phase locked filter utilizes a phase comparator circuit to tune a voltage-tuned band pass filter. The voltage-tuned band pass filter as a phase response, wherein the phase difference between the input and the output of the band pass filter is zero when the source signal is provided at the center frequency. The phase comparator circuit adjusts the center frequency of the band pass filter to phase lock the source signal from the divider. In this way, the divider can be utilized to provide a clean source signal without a large amount of noise. The phase comparator circuit preferably includes a phase detector or a phase comparator and an integrator. The voltage-tuned band pass filter preferably includes a varactor.

Phase locked loop filter utilizing a tuned filter

An apparatus including a base member fixedly mounted to a wall support surface, including a shaft member extending orthogonally relative to the base member, with a cylindrical magnetic tip mounted thereon. The cylindrical magnetic tip is cooperative with a magnetically attractive cylindrical plate member mounted in an aligned relationship to an associated door aligned with the rod and magnetic tip. Modifications of the invention include a magnetic cylindrical tip including a threaded shank securable to a resilient pad of a door stop projection cooperative with a cylindrical tip. Further, the invention includes a cylindrical sleeve overlying the resilient projection provided with an encased magnetic member therewithin to provide a buffering action and minimize marring of an associated door in use.

Magnetic door stop

The size, power, and speed constraints in digital sinusoidal waveform generators using values stored in a read-only-memory are alleviated by storing the required values in two smaller read-only-memory devices containing a primary amplitude value and a secondary amplitude value, and a third read-only-memory containing corrective values, the total number of values in the three read-only-memory devices being reduced over the number in a single read-only-memory. The primary and secondary values are combined in accordance with disclosed trigonometric identities in response to a repetitive binary count, and the corrective values are added as determined by logic circuitry responding to the same binary count.

Digital sine conversion circuit for use in direct digital synthesizers

The bandwidth of frequency modulated signals is limited in a digital data transmission system by shaping the square digital waveform to form a trapezoidal shaped waveform having a positively-sloped ramp on the leading edge of the waveform and negatively-sloped ramp on the following edge of the waveform. Provisions are made to selectively determine the slope of the ramps and the amplitude of the waveform so that the system can be used with a wide range of data transmission speeds without resort to bandpass filter or component changes as were required in the prior art. Provision is also made for transmission of analog data in the same system by providing a feedback loop which causes the ramping to follow, and thus approximate, the analog waveform. The shaped data signal is fed to a frequency synthesizer which produces a frequency modulated sine wave whose frequency deviation is related to the magnitude of the digital or analog data signal.

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Cedar Rapids, IA, United States of America

Richard A Freeman