David R Piazza

US Patent:

20120244899, Sep 27, 2012

Filed:

Mar 23, 2012

Appl. No.:

13/429042

Inventors:

David Edwin Barker - Stockport, GB
David Sam Piazza - San Jose CA, US
Stephen Thomas Newbold - Holmer Green, GB

International Classification:

H04B 7/00

US Classification:

455507

Abstract:

Cross-polar discrimination (XPD) of a dual orthogonal cross-polarised antenna is maximized via a cross-coupling network between base station MIMO branches prior to connection to the base station antenna. In one embodiment, a cross coupling network combines each MIMO branch signal with an attenuated phase reversed (phase shifted) copy of the other MIMO branch signal. The amount of attenuation for each branch is equivalent to the cross polar suppression required for each antenna array. The cross-coupling can be applied at different stages of signal processing within a base station.

US Patent:

20130044650, Feb 21, 2013

Filed:

Aug 18, 2012

Appl. No.:

13/589121

Inventors:

David Edwin Barker - Stockport, GB
David Sam Piazza - San Jose CA, US

Assignee:

Quintel Technology Limited - Bristol

International Classification:

H04B 1/44
H04W 72/04
H04W 88/08

US Classification:

370278, 4555621, 370329

Abstract:

In one embodiment, the present disclosure provides a method and apparatus for spatially filtering inter-cell co-channel interference in the elevation plane, which in turn will improve network spectral efficiency.

US Patent:

58250891, Oct 20, 1998

Filed:

Sep 30, 1996

Appl. No.:

8/722698

Inventors:

Gregory P. Valenti - Mountain View CA
Howard D. Bartlow - West Linn CA
David S. Piazza - Santa Clara CA

Assignee:

Spectrian, Inc. - Sunnyvale CA

International Classification:

H01L 2334

US Classification:

257718

Abstract:

A ceramic package and mounting structure which requires less surface area on a heat sink and improves heat transfer to the heat sink. Each ceramic package has a top side and a bottom side with the bottom side being flat and smooth. The bottom side can be a polished ceramic, or metal layer which is plated or brazed to the bottom side. The mounting structure includes a clamp and a spring in pressure engagement with the top side of the package for maintaining the package in pressure engagement with the heat sink.

US Patent:

57105197, Jan 20, 1998

Filed:

Mar 29, 1996

Appl. No.:

8/623961

Inventors:

William H. McCalpin - Sunnyvale CA
Donald K. Belcher - Rogersville TN
David S. Piazza - Santa Clara CA
Pierre R. Irissou - Sunnyvale CA

Assignee:

Spectrian - Sunnyvale CA

International Classification:

G05F 110
H01L 3500
H03K 1760

US Classification:

327538

Abstract:

A circuit arrangement automatically sets quiescent collector current conditions for a class A/B RF power transistor, which is configured of a plurality of parallel-connected transistors formed in a common semiconductor die. The biasing circuit arrangement includes a temperature-sensing transistor having its collector-emitter current flow path coupled with a programmable constant current source. A differential amplifier circuit is coupled to the base and emitter electrodes of the temperature sensing transistor, and generates a bias voltage for biasing each of the transistors of the RF power device. This bias voltage is combined with a programmable D. C. offset voltage. The values of the constant current and D. C. offset voltage are programmed such that the average of the quiescent collector currents of the parallel-connected transistors of the RF power transistor corresponds to the quiescent collector current through the temperature-sensing transistor. An optional external control voltage may be used to further adjust the bias voltage for the RF power transistor.

US Patent:

20190020124, Jan 17, 2019

Filed:

Aug 30, 2018

Appl. No.:

16/117212

Inventors:

- Temple Quay, GB
Lance Darren Bamford - Pittsford NY, US
David Sam Piazza - San Jose CA, US
David Edwin Barker - Stockport, GB

International Classification:

H01Q 21/24
H01Q 21/26
H01Q 5/48
H01Q 5/28
H01Q 5/42
H01Q 1/24

Abstract:

In one example, the present disclosure provides a dual-polarized antenna array that includes at least one unit cell. The at least one unit cell includes at least one radiating element of a first polarization state and at least two radiating elements of a second polarization state. The second polarization state is orthogonal to the first polarization state. The at least two radiating elements of the second polarization state are displaced on a first side and a second side of the at least one radiating element of the first polarization state.

US Patent:

20160261326, Sep 8, 2016

Filed:

May 16, 2016

Appl. No.:

15/156018

Inventors:

- Bristol, GB
David Sam PIAZZA - San Jose CA, US

International Classification:

H04B 7/06
H04B 7/04

Abstract:

In one embodiment, the present disclosure provides a method and apparatus for spatially filtering inter-cell co-channel interference in the elevation plane, which in turn will improve network spectral efficiency.

US Patent:

20150222025, Aug 6, 2015

Filed:

Jan 30, 2015

Appl. No.:

14/610987

Inventors:

- Bristol, GB
Lance Darren Bamford - Pittsford NY, US
David Sam Piazza - San Jose CA, US
David Edwin Barker - Stockport, GB

International Classification:

H01Q 21/24
H01Q 21/26

Abstract:

In one example, the present disclosure provides a dual-polarized antenna array that includes at least one unit cell. The at least one unit cell includes at least one radiating element of a first polarization state and at least two radiating elements of a second polarization state. The second polarization state is orthogonal to the first polarization state. The at least two radiating elements of the second polarization state are displaced on a first side and a second side of the at least one radiating element of the first polarization state.

US Patent:

20140242930, Aug 28, 2014

Filed:

Feb 21, 2014

Appl. No.:

14/186524

Inventors:

- Bristol, GB
Lance Darren Bamford - Pittsford NY, US
Peter Chun Teck Song - San Francisco CA, US
David Sam Piazza - San Jose CA, US

Assignee:

Quintel Technology Limited - Bristol

International Classification:

H01Q 21/30
H04B 1/04

US Classification:

455129, 343893, 343853

Abstract:

In one example, the present disclosure describes an antenna system with at least two linear antenna arrays, each having a plurality of antenna elements. Each array is designed to transmit and receive signals from different respective spectrum bands. The first antenna array and second antenna array are arranged to form one longer, combined linear array of antenna elements. In addition, at least one antenna element is shared between the first and second antenna arrays. In one example, the first antenna array is connected to a first RF distribution and phase-shifting network to distribute RF power and impart a phase profile across the first antenna array and the second antenna array is connected to a second RF distribution and phase-shifting network to distribute RF power and impart a phase profile across the second antenna array.