Eugene M Fischer

US Patent:

6608997, Aug 19, 2003

Filed:

Jan 11, 1999

Appl. No.:

09/227833

Inventors:

Eugene Fischer - Clermont FL
Steven K. Latham - Orlando FL

Assignee:

Lockheed Martin Corporation - Bethesda MD

International Classification:

H04B 104

US Classification:

455127, 455115

Abstract:

The present invention is directed to an apparatus and method for varying the power level of a transmitted signal, such as a transmitted radio frequency signal, of high power, high transmission rate systems in a relatively straightforward, cost efficient manner. Exemplary embodiments can provide a range of stable DC control voltages for driving a power level attenuator, wherein the control voltages possess essentially no AC component (e. g. , in exemplary embodiments, at a 5 volt DC output, virtually no AC component in the millivolt range is present), and possess a high current capability (e. g. , at a 5 volt DC output exemplary embodiments can accommodate currents in excess of 0. 5 amps (A) up to 7 A or greater). The ability to provide very stable, high current capability transmission power attenuation is especially desirable for communication systems, and in particular, wireless communication systems wherein conservation of energy is important, and wherein transmission rates are on the order of 125 Mb/s or higher, and transmission power is on the order of 0. 5 to 2 watts (W) or higher.

US Patent:

20050088258, Apr 28, 2005

Filed:

Oct 27, 2003

Appl. No.:

10/694523

Inventors:

Eugene Fischer - Clermont FL, US

Assignee:

Xytrans, Inc. - Orlando FL

International Classification:

H01P001/203

US Classification:

333204000

Abstract:

A millimeter wave filter for surface mount applications includes at least one low temperature, co-fired ceramic layer defining an outer filter surface. A plurality of parallel, coupled line millimeter wavelength hairpin resonators, each formed from a single stripline or microstrip, are positioned on the outer filter surface. Each hairpin resonator is folded back upon itself into substantially parallel resonator lines.