JAMES F MCLEAN
Electrician at Crestland Dr, Austin, TX

6657601, Dec 2, 2003

Dec 21, 2001

10/032053

James S. McLean - Austin TX

TDK RF Solutions - Cedar Park TX

H01Q 916

343792, 343791, 343821

The present invention provides a metrology antenna system that combines a sleeve dipole antenna having two coaxial input ports with a balancing network. This combination (1) minimizes or eliminates spurious radiation from the balancing network (2) provides for a symmetric pair of feed regions which may be made arbitrarily small, and (3) provides for an essentially perfect impedance match to a broad range of resistive source impedances. The present invention provides a fabrication of arbitrarily small feed regions such that dipoles can be realized at high frequencies at little manufacturing cost.

6677912, Jan 13, 2004

Dec 13, 2001

10/022759

James S. McLean - Austin TX

TDK RF Solutions - Cedar Park TX

H01Q 1110

3437925, 343810, 174 70 A, 174102 R

A conductive member may include a conductor having a pair of opposed parallel surfaces and a cable guide arranged inside the conductor. In another embodiment, a conductive member may include a conductive bar having a pair of opposed parallel surfaces and a convex surface connecting respective first ends of the pair of opposed parallel surfaces to one another. An embodiment of a method for forming a conductive member includes forming a cable guide arranged inside a conductor having opposed parallel surfaces, where the cable guide is oriented in a direction substantially parallel to the opposed parallel surfaces. In an embodiment of an antenna, the antenna includes a conductor having a pair of opposed lateral surfaces, and a cable guide arranged inside the conductor and oriented in a direction substantially parallel to that of the opposed parallel surfaces.

6515632, Feb 4, 2003

Jul 12, 2001

09/905150

James S. McLean - Austin TX

TDK RF Solutions - Cedar Park TX

H01Q 1112

343741, 343742

An antenna includes a conductive loop with multiple feed points spaced around the loop. The loop may be opened at each feed point, thereby forming multiple loop portions. In an embodiment, the antenna may be a shielded loop antenna having multiple shielded feed lines. A kit including one or more components of such a shielded loop antenna may include a conductive structure in the form of a loop having multiple radial arms. In an embodiment of a method for forming an antenna, multiple feed points may be spaced apart around a conductive loop, and a respective feed line coupled to each of the feed points. In an embodiment, the feed lines may be shielded lines connected together at a shunt connection. The antenna may produce an isotropic radiation pattern similar to that of an electrically small antenna, but from an antenna of moderate electrical size.

7388550, Jun 17, 2008

Oct 11, 2005

11/247944

James S. McLean - Austin TX, US

TDK Corporation - Chiba

H01Q 21/00, H01Q 11/02, H01Q 13/10, H01Q 9/38

343725, 343739, 343767, 343829

A low-loss, high-efficiency, broadband antenna including both electric and magnetic dipole radiators is provided herein. The broadband antenna may be referred to as a “P×M antenna” and may generally include a ground plane; a magnetic radiator formed within the ground plane; a conductive feed arranged within a first plane, which is parallel to the ground plane; and an electric radiator arranged within a second plane, which is perpendicular to the ground plane and coupled at one end to the conductive feed. According to a particular aspect of the invention, the electric and magnetic radiators are substantially complementary to one another and are coupled for producing a P×M radiation pattern over a broad range of operating frequencies. One advantage of the P×M antenna described herein is that the complementary antenna elements are combined without the use of a lossy, resistive matching network, thereby increasing the efficiency with which the P×M radiation pattern is produced.

8159240, Apr 17, 2012

Jan 9, 2009

12/351044

James S. McLean - Austin TX, US
Robert A. Sutton - Austin TX, US

TDK Corporation - Chiba

G01R 29/20

324726, 324127, 336180

A Bulk Current Injection (BCI) transformer is provided herein with a magnetic core and a plurality of windings. The magnetic core is configured for encircling one or more electrical conductors under test. Each of the plurality of windings are wrapped, at least in part, around a longitudinal dimension of the magnetic core and spaced apart around an azimuthal dimension of the magnetic core. During injection tests, a power source may be coupled for supplying current to each of the windings at a respective “feed point. ” Arranging multiple feed points around the magnetic core enables current flow through the windings to generate an azimuthally-uniform magnetic flux density in the magnetic core. The uniform magnetic flux density enables the BCI transformer to excite only common mode currents in the electrical conductors under test. BCI test methods, including injection tests and current sensing tests are also provided herein, along with a test setup for characterizing BCI transformers.

7161550, Jan 9, 2007

Apr 18, 2005

11/108394

James S. McLean - Austin TX, US
Robert A. Sutton - Austin TX, US

TDK Corporation - Chiba

H01Q 13/00

343786, 343787

As provided herein, a dual- or quad-ridged broadband horn antenna may include a pair of conductive antenna elements arranged opposite one another for guiding an electromagnetic wave in a longitudinal direction through the horn antenna. In some cases, the pair of conductive antenna elements may include substantially convex inner surfaces and appropriately shaped outer surfaces. The convex inner surfaces may generally function to direct or guide the radiated energy without disturbing the intended radiation pattern. To maintain the intended radiation pattern, the broadband horn antenna may also include a pair of tapered extension elements, each coupled to an outer surface of a different one of the antenna elements at one end thereof. In some cases, a magnetic material may be arranged upon at least a portion of the antenna elements to restrict surface currents to flowing along the inner surfaces only. In some cases, longitudinal grooves may be formed within the inner surfaces to restrict surface currents from flowing in a direction transverse to the longitudinal direction.

8593363, Nov 26, 2013

Jan 27, 2011

13/015280

James McLean - Austin TX, US
Kunio Yata - Tokyo, JP
Robert Sutton - Austin TX, US
Hidetsugu Sakou - Tokyo, JP
Nobutaka Misawa - Tokyo, JP

TDK Corporation - Chiba

H01Q 9/16

343792, 343822

An end-fed sleeve dipole is provided herein with improved impedance match and increased bandwidth by incorporating a ¾-wavelength transformer in the antenna design. The ¾-wavelength transformer is compatible with a number of different choking schemes, including but not limited to, a single ¼-wave choke sleeve, a single ¼-wave choke sleeve with additional ferrite beads, and two or more ¼-wave choke sleeves with or without ferrite beads. In some embodiments, one or more shunt resonators may be used to provide additional impedance compensation.

6329955, Dec 11, 2001

Oct 26, 1999

9/428220

James Stuart McLean - Austin TX
Gentry Elizabeth Crook - Austin TX

TDK RF Solutions Inc. - Cedar Park TX

H01Q 1112

343742

A broadband antenna incorporating both electric and magnetic dipole radiators includes a tapered feed, such as a bow-tie feed, having a central feedpoint and first and second outer regions displaced from the central feedpoint. One or more conducting loop elements are connected between the outer regions of the tapered feed. Top loading capacitive elements extending from each of the outer regions may also be provided.

7215292, May 8, 2007

Jul 5, 2005

11/175531

James S. McLean - Austin TX, US

TDK Corporation - Chiba

H01Q 21/00

343725, 343726, 343867, 343797

A broadband antenna including both electric and magnetic dipole radiators is provided herein. The broadband antenna may be referred to as a “P×M antenna” and may include a pair of magnetic loop elements, each having multiple feed points symmetrically spaced around the loop element. The broadband antenna may also include an electric dipole element arranged between the pair of magnetic loop elements. In general, the electric dipole element and the magnetic loop elements may be coupled together through a network of transmission lines, as opposed to being incorporated into a single radiative element.

6154182, Nov 28, 2000

Mar 23, 1999

9/274983

James Stuart McLean - Austin TX

EMC Automation, Inc. - Cedar Park TX

H01Q 1300, H01Q 900

343773

An extensible top-loaded biconical antenna is modified to improve low frequency performance while retaining standard performance specifications when needed. The biconical antenna includes a balun and a pair of conical outrigger assemblies coupled to said balun. A conducting tophat plate is removably attached to the ends of each outrigger assembly. The tophats increase the capacitance of the antenna, thereby improving its low frequency gain by 10 dB or more.