Andrew Anatoly Efanov

6421016, Jul 16, 2002

Oct 23, 2000

09/694247

James P. Phillips - Lake in the Hills IL
Eric L. Krenz - Crystal Lake IL
Andrew A. Efanov - Harvard IL
Narendra Pulimi - Schaumburg IL

Motorola, Inc. - Schaumburg IL

H01Q 124

343702, 343846, 343895, 455575

An improved antenna system to channel counterpoise currents for an unbalanced antenna such as a helical monopole. A first conductor, or ground resonator, is coupled to a ground connection near the antenna and is located distally from a user to reduce electromagnetic exposure. The first conductor presents a low impedance path at an operating frequency of the antenna such that RF currents are attracted onto the first conductor. A second conductor, such as a printed circuit board or user interface circuitry, is also coupled to the ground connection of the first conductor. The second conductor presents a high impedance path at the operating frequency of the antenna such that RF currents are diverted away from the second conductor which is held closer to a user than the first conductor.

6600450, Jul 29, 2003

Mar 5, 2002

10/091666

Andrew A. Efanov - Crystal Lake IL
James P. Phillips - Lake in the Hills IL

Motorola, Inc. - Schaumburg IL

H01Q 2100

343726, 343700 MS, 343702

A balanced antenna system for a communication device includes a balanced transmission line electromagnetically coupled to a transceiver of the device. A symmetrical dipole antenna element is operable at a first frequency driven by the balanced transmission line. A symmetrical loop antenna shares portions of the dipole antenna element and is operable at a second frequency driven by the transmission line. Preferably, the antenna system is disposed within a flip portion of the device housing.

6657595, Dec 2, 2003

May 9, 2002

10/142173

James P. Phillips - Lake in the Hills IL
Eric L. Krenz - Crystal Lake IL
Andrew A. Efanov - Crystal Lake IL
Rachid M. Alameh - Crystal Lake IL
Roger L. Scheer - Crystal Lake IL

Motorola, Inc. - Schaumburg IL

H01Q 124

343702, 343846, 343895

An adaptive antenna system having a counterpoise conductor contained within a housing of a communication device and located distally from such surfaces of the housing that can be held by or placed in proximity to a user or external objects which detune the counterpoise. A tuning circuit is coupled between the counterpoise conductor and a ground. The tuning circuit is operable to adapt the resonant frequency of the counterpoise conductor to divert operational RF currents away from the ground located in proximity the user or external objects and onto the counterpoise conductor.

7292195, Nov 6, 2007

Jul 26, 2005

11/189689

James P. Phillips - Lake In The Hills IL, US
Andrew A. Efanov - Crystal Lake IL, US
Kristen M. Leininger - Grayslake IL, US

Motorola, Inc. - Schaumburg IL

H01Q 11/12

343744

An energy density diversity antenna (EDA) has a least a pair of antenna elements, whose feeding points are connected to outputs of a hybrid coupler configured such that a sum and a difference signal may exist at the feed points of the antenna elements. First reactive elements are respectively inserted in the antenna elements proximal the respective feed points. The antenna elements are joined at a point distal from the feed points by a second reactive element, and a third reactive element is coupled between feed lines coupled to the feed points at a location between the feed points and the outputs of the hybrid coupler.

20120287011, Nov 15, 2012

May 13, 2011

13/107560

Hugh K. Smith - Palatine IL, US
Eric L. Krenz - Crystal Lake IL, US
Karan J. Jumani - Palatine IL, US
Andrew A. Efanov - Crystal Lake IL, US

MOTOROLA MOBILITY, INC. - Libertyville IL

H01Q 21/24
H04B 1/04
H04B 7/00

343853, 455130, 455132, 455129

An electronic device () includes an antenna system () having two antennas (). A first antenna () has a first antenna element () positioned near a first corner () of a planar, rectangular ground plane () and a second antenna element () positioned near a second corner of the ground plane that is diagonally across from the first corner. A second antenna () has a third antenna element () positioned near a third corner () of the ground plane that is adjacent to the first corner and a fourth antenna element () positioned near a fourth corner () of the ground plane that is diagonally across from the third corner. At low-band frequencies, the antenna elements () of the first antenna () are driven out-of-phase relative to each other. Similarly, at low-band frequencies, the antenna elements () of the second antenna () are driven out-of-phase relative to each other.

20130009842, Jan 10, 2013

Sep 14, 2012

13/615807

Hugh K. Smith - Palatine IL, US
Eric L. Krenz - Crystal Lake IL, US
Karan J. Jumani - Palatine IL, US
Andrew A. Efanov - Crystal Lake IL, US

Motorola Mobility LLC - Libertyville IL

H01Q 21/24

343853

An electronic device () includes an antenna system () having two antennas (). A first antenna () has a first antenna element () positioned outside a first corner () of a planar, rectangular ground plane () and a second antenna element () positioned outside a second corner of the ground plane that is diagonally across from the first corner. A second antenna () has a third antenna element () positioned near a third corner () of the ground plane that is adjacent to the first corner and a fourth antenna element () positioned near a fourth corner () of the ground plane that is diagonally across from the third corner. At low-band frequencies, the antenna elements () of the first antenna () are driven out-of-phase relative to each other. Similarly, at low-band frequencies, the antenna elements () of the second antenna () are driven out-of-phase relative to each other.

6348897, Feb 19, 2002

Feb 16, 2001

09/788197

Rachid M. Alameh - Crystal Lake IL
Eric L. Krenz - Crystal Lake IL
Christopher S. Gremo - Algonquin IL
Andrew A. Efanov - Crystal Lake IL
Ji Chen - Lake in the Hills IL

Motorola, Inc. - Schaumburg IL

H01Q 124

343702

A multi-function antenna system for a radio communication device includes a housing that encloses a radio frequency transceiver of the radio communication device. A mounting base is coupled to the housing and has a first set of electrical contacts coupled to the transceiver. An antenna element is coupled by a hinge to the mounting base and has a second set of electrical contacts. Different portions of the first and second set of contacts are connectable as a function of the relative positions of the mounting base and the antenna element so as to provide different antenna functions.

20230072031, Mar 9, 2023

Sep 7, 2021

17/468525

- Cupertino CA, US
Andrew A. Efanov - Sunnyvale CA, US
Avee Arvind - Mill Valley CA, US
Larbi Azzoug - San Jose CA, US
Thuy Nguyen - San Jose CA, US
William J. Noellert - Austin TX, US

H01Q 1/42
H04B 5/00

A wireless communication system may include an electronic device having an antenna element. The antenna element may convey radio-frequency signals greater than 10 GHz across a dielectric housing wall. A dielectric matching structure may be interposed between the antenna element and the dielectric housing wall. The wireless communication system may include external equipment having an antenna element communicatively coupled to the electronic device antenna element to convey firmware testing, debugging, restore, and/or other data via a near-field wireless communication link. The external equipment may be configured to receive the electronic device at an opening. A dielectric matching structure may be provided at the external equipment between the dielectric housing wall and the external equipment antenna element. The interior surface of the dielectric housing wall may have planar, convex, or concave portions.