Resumes
Resumes
Ben Hallford Phones & Addresses
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Dallas, TX
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1458 Lakeview Dr, Wylie, TX 75098 (972) 442-2948 (972) 429-1367
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3625 Arbuckle Dr, Plano, TX 75075 (972) 442-2948 (972) 985-7749
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Richardson, TX
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Colton, TX
Publications
Us Patents
Microwave Mixer With Linking Juxtaposed Balun Port
View pageUS Patent:
43597823, Nov 16, 1982
Filed:
May 19, 1981
Appl. No.:
6/265127
Inventors:
Ben R. Hallford - Wylie TX
Assignee:
Rockwell International Corporation - El Segundo CA
International Classification:
H04B 126
H03H 742
H03H 742
US Classification:
455327
Abstract:
Microwave circuit layout and structure is disclosed for a diode bridge mixer. Linking structure provides interconnection from coplanar sections of balanced first and second conductors to non-coplanar sections juxtaposed on opposite sides of the substrate which are in turn interconnected to two pairs of parallel divergent coplanar grounding stubs which are juxtaposed third and fourth conductors on the other side of the substrate.
Low Frequency Converter With Diode Pair Mixer
View pageUS Patent:
43653502, Dec 21, 1982
Filed:
Mar 13, 1981
Appl. No.:
6/243326
Inventors:
Ben R. Hallford - Wylie TX
Assignee:
Rockwell International Corporation - El Segundo CA
International Classification:
H04B 126
US Classification:
455330
Abstract:
A low frequency, diode pair mixer is provided in combination with simple, compact transformer circuitry. A diode mixer bridge has a pair of diodes interconnecting secondary windings of single and dual transformers. The diodes are connected in series across the secondary winding of the single transformer. The same polarity ends of the pair of secondary windings of the dual transformer are connected in common to a point between the diodes. The other ends of the pair of secondary windings are connected to respective ends of the secondary winding of the single transformer. The combination affords isolation between the signals coupled through each of the transformers. The combination may be implemented as an up converter or a down converter.
Microwave Frequency Converter With Economical Coupling
View pageUS Patent:
43719821, Feb 1, 1983
Filed:
Mar 13, 1981
Appl. No.:
6/243231
Inventors:
Ben R. Hallford - Wylie TX
Assignee:
Rockwell International Corporation - El Segundo CA
International Classification:
H04B 126
US Classification:
455327
Abstract:
A microwave frequency converter is provided with cost effectively manufacturable microstrip layout circuitry, particularly for directionally coupling the LO signal. A pair of unbalanced microstrip conductors lead from a mixer bridge respectively to a pair of balun IF rejection filters juxtaposed on the opposite side of a dielectric substrate. A second pair of unbalanced microstrip conductors lead respectively from the pair of balun IF rejection filters to a microstrip branch line coupler.
Balun Coupled Microwave Frequency Converter With Single Pair Of Diodes
View pageUS Patent:
43597815, Nov 16, 1982
Filed:
Dec 15, 1980
Appl. No.:
6/216718
Inventors:
Ben R. Hallford - Wylie TX
Assignee:
Rockwell International Corporation - El Segundo CA
International Classification:
H04B 126
US Classification:
455327
Abstract:
A balun coupled microwave frequency converter is provided by a mixer using a single diode pair with one port balanced and the other port unbalanced. The balanced port is provided by first and second coplanar conductors extending toward a common area and juxtaposed in spaced parallel relation with a transmission line interacting therewith to couple a field balanced between the first and second conductors across the common area. The unbalanced port to the mixer is provided by a third conductor. The diode pair is connected in series between the first and second conductors, and a point between the diodes is connected to the third conductor. One implementation is an up converter with an LO and an IF signal applied on the third conductor and input to the mixer to generate an RF signal between the first and second conductors and hence an induced output RF signal on the transmission line.
Dual Signal Amplitude Modifying And Combining Apparatus
View pageUS Patent:
47136200, Dec 15, 1987
Filed:
Dec 22, 1986
Appl. No.:
6/945283
Inventors:
Ben R. Hallford - Wylie TX
Karl R. Varian - Plano TX
Karl R. Varian - Plano TX
Assignee:
Rockwell International Corporation - El Segundo CA
International Classification:
H03K 1700
US Classification:
328150
Abstract:
The present inventive concept combines two signals, each representative of a portion of a single signal, wherein the two signals have different non-linear slopes, and produces a single linearly changing output signal indicative of the combination. This circuit is specifically used in combination with the feedback loop of a delayed automatic gain control circuit to detect the signal level applied to the gain control circuit and to provide a linearly changing output signal representative of the decibel value of the signal applied to the automatic gain control circuit. This is accomplished by linearizing the two different signals independently, and establishing a maximum value for one signal, a minimum value for the other signal, and summing these in conjunction with a reference to produce a single composite linearly changing signal.
Symmetric Microwave Mixer With Improved Isolation
View pageUS Patent:
43808310, Apr 19, 1983
Filed:
Jul 24, 1981
Appl. No.:
6/286405
Inventors:
Ben R. Hallford - Wylie TX
Assignee:
Rockwell International Corporation - El Segundo CA
International Classification:
H04B 126
H03H 742
H03H 742
US Classification:
455327
Abstract:
Microwave circuit layout structure is disclosed for a diode quad mixer frequency converter with separate, isolated sections, each supplied by a respective half of dual balun port structure. The circuit layout structure is compact and symmetric, and enables coplanar diode connection.
Signal Converter Apparatus
View pageUS Patent:
41863526, Jan 29, 1980
Filed:
Mar 23, 1978
Appl. No.:
5/889171
Inventors:
Ben R. Hallford - Wylie TX
Assignee:
Rockwell International Corporation - El Segundo CA
International Classification:
H04B 126
H01P 510
H01P 516
H01P 510
H01P 516
US Classification:
325446
Abstract:
Microstrip technology is utilized in illustrating new and improved versions of baluns, hybrid junctions and half-wave balanced mixers and full-wave double balanced mixers.
Frequency Translator
View pageUS Patent:
42453569, Jan 13, 1981
Filed:
Apr 27, 1979
Appl. No.:
6/034045
Inventors:
Ben R. Hallford - Wylie TX
Assignee:
Rockwell International Corporation - El Segundo CA
International Classification:
H04B 126
US Classification:
455327
Abstract:
A planar balun coupled frequency translator (upconverter or downconverter, is illustrated in various configurations for providing both full-wave and half-wave signal frequency conversion. As illustrated, each of the circuits uses microstrip and strip transmission line construction techniques for cost effective construction. As designed, the carrier and signal frequency baluns are separately interfaced in sets rather than all being connected in series as in the prior art.