Lu U Chen

US Patent:

6542047, Apr 1, 2003

Filed:

Dec 5, 2000

Appl. No.:

09/729380

Inventors:

Lu Chen - Brooklyn NY
Radha Setty - Staten Island NY
Daxiong Ji - Brooklyn NY

Assignee:

Mini-Circuits - Brooklyn NY

International Classification:

H01P 516

US Classification:

333119, 336170

Abstract:

A 90 degree splitter which covers a wide frequency range of 1500 to 2500 Mhz in a small footprint of only 0. 2 inches by 0. 2 inches. This device does not use any capacitors which greatly simplifies the construction and lowers the cost in comparison to conventional splitters.

US Patent:

6965280, Nov 15, 2005

Filed:

May 21, 2004

Appl. No.:

10/850511

Inventors:

Lu Chen - Brooklyn NY, US

International Classification:

H03H007/38

US Classification:

333131, 333119, 333118

Abstract:

A three way power splitter that has a small package size. The three way power splitter includes a multi-layered low temperature co-fired ceramic substrate. An input transformer and three output transformers are attached to the top of the substrate. The transformers have wires that are attached to terminals on the top of the substrate. Three resistors are located on the top surface of the substrate under the transformers. A capacitor is located within the substrate. Terminals are also located on the bottom of the substrate. Several conductive vias extend through the substrate and connect the resistors, the capacitor and the terminals.

US Patent:

7049905, May 23, 2006

Filed:

Jul 6, 2004

Appl. No.:

10/884510

Inventors:

Lu Chen - Brooklyn NY, US

Assignee:

Scientific Components Coporation - Brooklyn NY

International Classification:

H01P 3/08
H01P 5/18

US Classification:

333116, 333246

Abstract:

A directional coupler has a multi-layered low temperature co-fired ceramic substrate. A circuit line is located on one of the layers and is connected to an input port and an output port. Another circuit line is located on a different layer and is connected to a forward coupled port and a reverse coupled port. The circuit lines are located close to each other such that they are electromagnetically coupled. Ground planes are located on the top and bottom surfaces of the substrate.

US Patent:

7218186, May 15, 2007

Filed:

Mar 29, 2004

Appl. No.:

10/810416

Inventors:

Lu Chen - Brooklyn NY, US

Assignee:

Scientific Components Corporation - Brooklyn NY

International Classification:

H01P 3/08
H01P 5/18

US Classification:

333116, 333246

Abstract:

A directional coupler for low frequencies that is small and can handle high power levels. The directional coupler includes a pair of circuit lines having an input port, an output port, a forward coupled port and a reverse coupled port. The circuit lines are located proximate to each other such that they are electromagnetically coupled. A low pass filter is connected to the forward coupled port. The low pass filter shifts the operating frequency of the directional coupler.

US Patent:

20060164181, Jul 27, 2006

Filed:

Jan 24, 2005

Appl. No.:

11/040793

Inventors:

Lu Chen - Brooklyn NY, US

International Classification:

H01P 5/18

US Classification:

333116000

Abstract:

A directional coupler that has improved coupling flatness. The directional coupler includes a first, second and third coupler. Each of the couplers has an input port, an output port, a forward coupled port and a reverse coupled port. The forward coupled port of the first coupler is connected to the input port of the second coupler. The reverse coupled port of the first coupler is connected to ground. The output port of the second coupler is connected to the input port of the third coupler. The output port of the third coupler forms a second forward coupled port. The second and third couplers reduce the variation in coupling over a frequency range.