Inventor

BELCHER DONALD K

US50 patents

⚠️ This page may combine multiple inventors who share the name “BELCHER DONALD K”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

BELCHER DONALD K

HARRIS CORP

Proximity monitoring apparatus employing encoded, sequentially generated, mutually orthogonally polarized magnetic fields

Optimization of DC power to effective irradiated power conversion efficiency for helical antenna

Proximity monitoring apparatus employing encoded, sequentially generated, mutually orthogonally polarized magnetic fields

Variable capacitor and method

Waveguide with edge grounding

Spread spectrum communication system employing composite spreading codes with matched filter demodulator

Micro-power gain lattice

Divergence feedback in a linear fiber optic analog transmission system and method

Microwave transistor stabilization circuit

Fully integrated data receiver and method for receiving on/off keyed AM/PDSK modulated signals

Low impedance loop antenna and drive circuitry

Signal quality-dependent adaptive recursive integrator

Monolithic FET bridge attenuator

Phase-compensated FET attenuator

Frequency division switching using RF buss

RF signal distribution scheme

Power series correction in a linear fiber optic analog transmission system and method

High impedance low-distortion linear amplifier

Class-C RF power amplifier having digitally driven shunt circuit for removing accumulated excess base charge

Proximity detection using DPSK waveform

WHERENET CORP

Low cost DTOA location processing system based on multiple readers-to-single processor architecture

Multi-lateration system with automatic calibration and error removal

Interference suppression for wireless local area network and location system

Spread spectrum baseband modulation of magnetic fields for communications and proximity sensing

Computer workstation tool for displaying performance estimate of tagged object geo-location system for proposed geometry layout of tag transmission readers

Wireless local area network with geo-location capability

Geolocation system with controllable tags enabled by wireless communications to the tags

Real-time locating system and method using timing signal

Proximity-based magnetic field generator for controlling operation of RF burst-transmitting tags of geolocation system

Use of rotating magnetic field to enhance communication with RF burst-transmitting tags of object location system

Magnetic field emission and differential receiver coil configuration for discriminating response magnetic field from transponder tag

Ultra-sensitive magnetic field receiver capable of operating in high noise environments

Composite BPSK/AM-BPSK based spectral suppression of out-of-band energy from saturated RF amplifier

SPECTRIAN

Adaptive compensation of RF amplifier distortion by injecting predistortion signal derived from respectively different functions of input signal amplitude

Feed-forward correction loop with adaptive predistortion injection for linearization of RF power amplifier

Baseband measurement of RF power amplifier distortion

Adaptive compensation of RF amplifier distortion by injecting predistortion signal derived from respectively different functions of input signal amplitude

Circuit for automatically biasing RF power transistor by use of on-chip temperature-sensing transistor

FLASH COMM INC

Automatic antenna tuner for low-cost mobile radio

Remote initiated messaging apparatus and method in a two way wireless data communications network

Technique for determining propagating and clear frequency to be used in wide area wireless data communications network

Low cost wide area network for data communication using outbound message specifying inbound message time and frequency

WIDATA CORP

Radio geo-location system with advanced first received wavefront arrival determination

Radio location system for precisely tracking objects by RF transceiver tags which randomly and repetitively emit wideband identification signals

Object identification system employing pulsed magnetic field-stimulated, tag-embedded transponder

RADIO SYSTEMS CORP

Electronic animal containment system with direction of approach determination

Portable animal tracking system

WHERENET

Radio geo-location system with advanced first received wavefront arrival determination

WHERENET INC

Distributed network for multi-lateration with circularly polarized antenna for hemispherical coverage

(unassigned)

Reduced semiconductor size package