Eswarappa Channabasappa

US Patent:

6509874, Jan 21, 2003

Filed:

Jul 13, 2001

Appl. No.:

09/905245

Inventors:

Frank Kolak - Billerica MA
Eswarappa Channabasappa - Nashua NH

Assignee:

Tyco Electronics Corporation - Middletown PA

International Classification:

H01Q 138

US Classification:

343700MS, 343771

Abstract:

A millimeter wave radar system including a microstrip antenna array that provides reduced return loss at microstrip antenna ports. The millimeter wave radar system includes at least one channel formed in a surface of a metal backing plate and a microstrip antenna array assembly. The assembly includes a plurality of conductive microstrips, a ground plane, and a dielectric substrate disposed between the conductive microstrips and the ground plane to form a plurality of microstrip transmission lines. The metal plate surface is mounted to the ground plate to form at least one waveguide. The ground plane has a plurality of slots formed therethrough to form a plurality of waveguide-to-microstrip transmission line transitions. The conductive microstrips have a plurality of tuning stubs coupled thereto and configured to provide reactive matching for the plurality of waveguide-to-microstrip transmission line transitions.

US Patent:

6646526, Nov 11, 2003

Filed:

Mar 14, 2002

Appl. No.:

10/099008

Inventors:

Noyan Kinayman - Malden MA
Eswarappa Channabasappa - Nashua NH
Allan Buckle - Kenilworth, GB
Nitin Jain - San Diego CA

Assignee:

M/A-Com, Inc. - Lowell MA

International Classification:

H01P 100

US Classification:

333248, 333251, 333 21 R, 333 26

Abstract:

A surface-mountable millimeter-wave waveguide filter is constructed using irises in a rectangular waveguide formed in a dielectric material such as glass. The filter structure is surface-mountable, has a single dielectric layer, and can be manufactured using a suitable monolithic microwave integrated circuit (MMIC) process. The filter has potential applications in millimeter-wave systems such as Local Multipoint Distribution System (LMDS) and Autonomous Cruise Control (ACC) radar for automobiles.

US Patent:

6784768, Aug 31, 2004

Filed:

Apr 9, 2003

Appl. No.:

10/410781

Inventors:

Kristi Dhimiter Pance - West Boston MA
Eswarappa Channabasappa - Acton MA
Adil Khalil - Lowell MA

Assignee:

M/A - Com, Inc. - Lowell MA

International Classification:

H01P 710

US Classification:

333219, 333222

Abstract:

The invention is a method and apparatus for coupling energy into or out of a dielectric resonator circuit by means of a coupling loop. More particularly, the invention is a method and apparatus for adjustably mounting a coupling loop relative to a resonator, the method and apparatus particularly adapted for use with conical and similar resonators in which the field of interest, typically the TE mode, varies as a function of longitudinal position relative to the resonator.

US Patent:

6828875, Dec 7, 2004

Filed:

Dec 9, 2002

Appl. No.:

10/315528

Inventors:

Eswarappa Channabasappa - Acton MA
Thongchai Hongsmatip - Lunenburg MA
Noyan Kinayman - Malden MA
Richard Alan Anderson - North Attleborough MA
Bernhard A. Ziegner - Tyngsborough MA

Assignee:

MIA-Com, Inc. - Lowell MA

International Classification:

H01P 512

US Classification:

333137, 333 34, 333286, 333295

Abstract:

A spatial power divider/combiner that comprises: a housing containing a first channel forming three sides of a rectangular input waveguide and a second channel forming three sides of a rectangular output waveguide; a board coupled to the housing, wherein the underside of the board forms the fourth side of the input and output waveguides; a series of slots etched on the underside of the board located in the input waveguide to divide an input signal; a series of slots etched on the underside of the board located in the output waveguide to recombine the divided signal; and a series of microstrip lines printed on the top side of the board to couple the input waveguide and the output waveguide. Additionally, the divider/combiner can comprise a series of active devices, such as MMIC power amplifier, to provide a spatial power amplifier.

US Patent:

6954177, Oct 11, 2005

Filed:

Nov 7, 2002

Appl. No.:

10/289874

Inventors:

Eswarappa Channabasappa - Acton MA, US
Frank Kolak - Billerica MA, US
Richard Alan Anderson - Attleborough MA, US

Assignee:

M/A-COM, Inc. - Lowell MA

International Classification:

H01Q001/38

US Classification:

343700MS, 343909, 343846

Abstract:

An antenna unit formed in the shape of a hollow box comprising (a) a substrate forming the front side of the antenna unit, (b) a first microstrip antenna array formed on the substrate, (c) a second microstrip antenna array formed on the substrate, (d) a ground plane forming the rear side of the antenna unit, and (e) a plurality of periodic filters formed on the ground plane. The periodic filters are formed by etching a series of circular patterns, or holes, through the ground plane. The periodic stop band filters provide for improved isolation between the microstrip antenna arrays, without the need for adding additional costly or space consuming components.

US Patent:

7057480, Jun 6, 2006

Filed:

Oct 10, 2002

Appl. No.:

10/268480

Inventors:

Kristi Dhimiter Pance - South Boston MA, US
Eswarappa Channabasappa - Acton MA, US

Assignee:

M/A-COM, Inc. - Lowell MA

International Classification:

H01P 1/205
H01P 1/20

US Classification:

333203, 3332191, 333235

Abstract:

A cross-coupled dielectric resonator circuit. Resonator circuits in accordance with the invention may be used to build low-loss compact filters, oscillators, and other circuits, particularly microwave circuits. The resonators are arranged relatively to each other within an enclosure in a very efficient and compact design that enhances adjustability and coupling between adjacent resonators and the cross-coupling of alternate resonators.

US Patent:

7088203, Aug 8, 2006

Filed:

Apr 27, 2004

Appl. No.:

10/833630

Inventors:

Kristi Dhimiter Pance - Auburndale MA, US
Eswarappa Channabasappa - Acton MA, US

Assignee:

M/A-COM, Inc. - Lowell MA

International Classification:

H01P 7/10

US Classification:

3332191, 333202

Abstract:

In accordance with the principles of the present invention, a resonator puck is provided with one or more vertical and/or horizontal, radial slits that improve the quality factor, Q, of circuits constructed from the resonators. Preferably, the slits are very narrow and, more preferably, about 100 to 1000 atoms wide. In some preferred embodiments of the invention, the surfaces of the resonators that define the slit are left relatively rough and may even contact each other such that the slit is not of uniform thickness, but essentially comprises a plurality of pockets between the two portions of the resonator.

US Patent:

7183881, Feb 27, 2007

Filed:

May 6, 2005

Appl. No.:

11/123535

Inventors:

Kristi Dhimiter Pance - Auburndale MA, US
Eswarappa Channabasappa - Acton MA, US

Assignee:

M/A-Com, Inc. - Lowell MA

International Classification:

H01P 1/20

US Classification:

333203, 3332191, 333235

Abstract:

A cross-coupled dielectric resonator circuit. Resonator circuits in accordance with the invention may be used to build low-loss compact filters, oscillators, and other circuits, particularly microwave circuits. The resonators are arranged relatively to each other within an enclosure in a very efficient and compact design that enhances adjustability and coupling between adjacent resonators and the cross-coupling of alternate resonators.