Bill T Agar

55840671, Dec 10, 1996

Aug 30, 1995

8/520905

Kenneth V. Buer - Chandler AZ
Bill T. Agar - Chandler AZ

Motorola, Inc. - Schaumburg IL

H04B 126

455302

A dual traveling wave resonator filter includes a microstrip line to receive an input signal at a first end and first and second traveling wave resonator rings. Each traveling wave resonator ring is in close proximity to the microstrip line such that first and second resonant first combined signals are induced, respectively, in each of the first and second traveling wave resonator rings in response to the input signal on the microstrip line. A band-reject signal is rejected from the microstrip line and a pass-band signal is produced from the microstrip line at a second end.

60919426, Jul 18, 2000

Dec 2, 1996

8/755861

Kenneth Vern Buer - Gilbert AZ
David Warren Corman - Gilbert AZ
Bill Tabano Agar - Chandler AZ

Motorola, Inc. - Schaumburg IL

H01Q 1112
H04B 106

4552341

An K-band amplifier circuit (10) with two samplers (12, 18) coupled to detectors (22, 26) that detect an input and an output RF signal level. These two reference signals are provided to a differential gain control circuit (24) which is coupled to one or more variable gain amplifier (VGA) (14) stages. The VGAs compensate for the gain of an entire chain of amplifiers (16). When the individual amplifier gains vary for any reason, (i. e. , process, temperature effects or end of life degradation) the variation in gain causes higher or lower levels of detected output reference signals for a given RF input signal. The gain control circuit (24) drives the VGA (14) up or down as appropriate. By maintaining a constant offset in input and output reference control signals, the gain control circuit (24) drives the amplifier chain (16) to a constant gain.

57125937, Jan 27, 1998

Feb 5, 1996

8/596533

Kenneth Vern Buer - Gilbert AZ
David Warren Corman - Gilbert AZ
Bill Tabano Agar - Chandler AZ

Motorola, Inc. - Schaumburg IL

H03G 320

330129

A power amplifier (10) suitable for satellite cellular communication systems provides highly efficient linear amplification of noise-like RF signals that have multiple carriers spread over a large instantaneous bandwidth. The amount of distortion present in the output is detected (14, 16, 18) and a feedback signal is provided to control the bias point of the active devices. As drive levels increase, the increased harmonic distortion power detected causes the power amplifier bias to increase thus reducing distortion. The control circuit (20) continually re-biases the power amplifier (12) for maximum efficiency for a predetermined level of distortion. The control circuit (20) may be adjusted to maximize efficiency while maintaining an allowable distortion level over the entire dynamic range of the devices.

55766714, Nov 19, 1996

Apr 24, 1995

8/427323

Bill T. Agar - Chandler AZ
David W. Corman - Gilbert AZ
Kenneth V. Buer - Chandler AZ

Motorola, Inc. - Schaumburg IL

H01P 512

333128

A method and apparatus for power combining or dividing handles high impedance line requirements in n-way combiners (15) and dividers (10) using phase delay networks (12, 14) to transform impedances to a lower, intermediate impedance. Each impedance transformation is accomplished using a stepped impedance or tapered impedance transmission line (26). The method and apparatus provides isolation between input or output ports (11, 22 and 24, 13) in power combining or dividing circuits using an incremental phase delay network (12) of prescribed electrical phase lengths (22, 24) to provide phase cancellation. The power divider (10) and combiner (15) can be used in power amplifiers and in communication devices.

20200358467, Nov 12, 2020

Feb 1, 2019

16/960823

- Carlsbad CA, US
Ramanamurthy V. DARAPU - Gilbert AZ, US
Martin GIMERSKY - Lausanne, CH
David E. PETTIT - Gilbert AZ, US
Bill T. AGAR - SCOTTSDALE AZ, US

VIASAT, INC. - Carlsbad CA

H04B 1/04
H04B 1/44
H04B 17/15
H04B 17/11
H04B 17/21
H04B 17/29
H04B 1/12

Methods and devices for radio frequency (RF) loopback for transceivers are described. A transceiver for communicating RF signals with a target device may transmit signals at a transmit frequency and receive signals at a (different) receive frequency. The transceiver may include a waveguide diplexer for separating and combining signals based on frequency. The transceiver may be configured to couple a loopback signal from a common port of the waveguide diplexer; the loopback signal may be based on a transmit signal. The transceiver may include a loopback translator to translate the loopback signal from the transmit frequency to the receive frequency and provide the translated loopback signal to a receiver used for receiving signals from the target device. The receiver may compare the translated loopback signal with a representation of the transmit signal to generate a compensation signal. A transmitter may use the compensation signal to adjust subsequent transmit signals.