Ronald J Wanat

US Patent:

54327806, Jul 11, 1995

Filed:

Apr 19, 1993

Appl. No.:

8/048916

Inventors:

John M. Smith - Elgin IL
James F. Long - Glen Ellyn IL
Ronald J. Wanat - Elgin IL
Anthony Kobrinetz - Hoffman Estates IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 726
H04B 702

US Classification:

370 37

Abstract:

A cellular radiotelephone communication system cell site equipment is provided. The cell site equipment includes a radio frequency transmitter operating as one signal frequency source. In addition, the cell site equipment includes a first and a second signal combiner device tuned to a first and a second signal frequency, respectively. Further, the cell site equipment includes a radio frequency switching mechanism, operatively coupled to the radio frequency transmitter, the first signal combiner device, and the second signal combiner device, for coupling the radio frequency transmitter to either of the first and the second signal combiner devices. In one embodiment, each signal combiner device includes a resonant cavity for isolating a signal frequency source from other signal frequency sources and a coupling for coupling the isolated signal frequency source to a common transmitter output. In an alternative embodiment, each signal combiner device includes a resonant cavity for isolating a signal frequency source from other signal frequency sources and a coupling for coupling the isolated signal frequency source of the first and the second signal combiner device to a first and a second common transmitter output, respectively.

US Patent:

46460381, Feb 24, 1987

Filed:

Apr 7, 1986

Appl. No.:

6/849098

Inventors:

Ronald J. Wanat - Elgin IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H01P 1207
H01P 710

US Classification:

333202

Abstract:

Transmitter combining apparatus includes up to five RF filters (100) coupled to a microstrip combiner (300) for combining up to five input signals for application to a common antenna. The RF filter (100) includes a ceramic resonator (116) sandwiched between first and second compensating discs (114 and 120) and first and second shield plates (142 and 148) for temperature compensation, low loss mounting and heat sinking of the ceramic resonator (116). Good thermal contact between the ceramic resonator (116), discs (114 and 120) and shield plates (142 and 148) is produced by a compressive force exerted by springs (144-147) of shield plate (142) when the top cover (112) is attached to the aluminum housing (124). The resonant frequency of the RF filter is tuned by means of an aluminum tuning shaft (102) and ceramic tuning core (118) which are positioned by brass bushing (133) in top cover (112). Input signals are coupled to each RF filter via respective input coupling loops (122) and output signals are coupled via corresponding output coupling loops (311) to the microstrip combiner (300).

US Patent:

40755819, Feb 21, 1978

Filed:

Jun 1, 1976

Appl. No.:

5/691683

Inventors:

Allen Loy Davidson - Crystal Lake IL
Ronald Joseph Wanat - Elgin IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H01P 518

US Classification:

333 10

Abstract:

The coupler accepts four independent RF input signals, divides each input into four equal parts, and applies each part to one of four adjoining output ports. Each input signal divided part is phase shifted a multiple of 90. degree. whereby the output ports, taken in the proper order, are in phase quadrature. The novel coupler comprises four hybrid couplers, all of which are fabricated on a dielectric substrate. The hybrid couplers are located on the substrate in a unique interleaved configuration whereby intercouplings are formed between selected hybrid couplers. The interleaved construction results in the electrical length of all intercouplings being controlled and, preferably, all are the same length.

US Patent:

46671722, May 19, 1987

Filed:

Apr 7, 1986

Appl. No.:

6/849099

Inventors:

Theodore F. Longshore - Hoffman Estates IL
Ronald J. Wanat - Elgin IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H01P 512
H01P 1201
H01P 708

US Classification:

333134

Abstract:

Transmitter combining apparatus includes up to five RF filters (100) coupled to a microstrip combiner (300) for combining up to five input signals for application to a common antenna. The RF filter (100) includes a ceramic resonator (116) sandwiched between first and second compensating discs (114 and 120) and first and second shield plates (142 and 148) for temperature compensation, low loss mounting and heat sinking of the ceramic resonator (116). Good thermal contact between the ceramic resonator (116), discs (114 and 120) and shield plates (142 and 148) is produced by a compressive force exerted by springs (144-147) of shield plate (142) when the top cover (112) is attached to the aluminum housing (124). The resonant frequency of the RF filter is tuned by means of an aluminum tuning shaft (102) and ceramic tuning core (118) which are positioned by brass bushing (133) in top cover (112). Input signals are coupled to each RF filter via respective input coupling loops (122) and output signals are coupled via corresponding output coupling loops (311) to the microstrip combiner (300).

US Patent:

42849667, Aug 18, 1981

Filed:

Dec 21, 1979

Appl. No.:

6/106413

Inventors:

Ronald J. Wanat - Elgin IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H01P 1201
H01P 700

US Classification:

333202

Abstract:

A helical resonator filter with increased bandwidth is provided for use as a wideband bandpass filter. The device is composed of a series of helical resonators cells cascaded with non-uniform cell spacing, thus providing an increase in coupling coefficients between cells. The increased bandwidth is thereby obtained without placing a burden on the exterior housing dimensions relative to a normally spaced narrow bandwidth filter and without substantially reducing the unloaded Q's or increasing insertion losses.