David R Bowman

US Patent:

41707788, Oct 9, 1979

Filed:

Jul 14, 1978

Appl. No.:

5/924559

Inventors:

David F. Bowman - Moorestown NJ

Assignee:

RCA Corporation - New York NY

International Classification:

H01Q 1310

US Classification:

343771

Abstract:

A ridged rectangular launching waveguide and a ridged rectangular radiating waveguide have a common length-wise wall comprised of wall segments. A wave launched at the proximal end of the launching waveguide is coupled to the radiating waveguide through passageways between the segments. A cylindrical metal rod extends through a segment to the wavepaths of the waveguides. Additionally, the ridges of the waveguides have similar notches near the rod, the rod and the notches forming similar attenuators in the wavepaths. The passageways result in a formation of a pair of three-db, ninety-degree hybrids connected back-to-back through the attenuators. The hybrids and the attenuators couple a predetermined percentage of the energy of the wave to a radiating slot in a panel at the distal end of the radiating waveguide. The remainder of the wave energy is reflected by the attenuators and coupled by the hybrids through the radiating waveguide towards the proximal end thereof.

US Patent:

43108148, Jan 12, 1982

Filed:

Jul 11, 1980

Appl. No.:

6/167489

Inventors:

David F. Bowman - Moorestown NJ

Assignee:

RCA Corporation - New York NY

International Classification:

H01P 519

US Classification:

333121

Abstract:

A transmission line hybrid junction which provides a power dividing and combining function between a first port and a pair of ports. In one embodiment it provides a well-matched, high-isolation, three-port, equal-power, equal-phase, power dividing junction with a bandwidth adequate for typical radio frequency applications. The hybrid junction comprises a single transmission line coupled to a pair of branch transmission lines, and a single resistive element coupled between the branch lines. The single transmission line comprises a quarter wavelength transforming section and each of the branch transmission lines comprises two cascaded quarter wavelength transforming sections. Coupling between two transforming sections of the branch transmission lines permits independent selection of the characteristic impedance of those sections in the odd and even modes of excitation.

US Patent:

39582477, May 18, 1976

Filed:

Dec 23, 1974

Appl. No.:

5/535814

Inventors:

Bruce Fredric Bogner - Mount Holly NJ
David Francis Bowman - Moorestown NJ

Assignee:

RCA Corporation - New York NY

International Classification:

H01Q 326
H01Q 1700

US Classification:

343754

Abstract:

A pair of conductive circular plates are positioned in a parallel spaced relationship. A conductive ring-like band extending about the periphery of the plates forms an enclosed parallel plate transmission line. A coupling member is located at the center of this enclosed transmission line. A plurality of peripheral coupling members to the transmission line are spaced radially from and in a ring-like pattern about the center coupling member. A plurality of radio frequency (RF) power absorption members are coupled to the transmission line at the regions between the peripheral coupling members to reduce radio frequency signal coupling between the peripheral coupling members.

US Patent:

43564623, Oct 26, 1982

Filed:

Nov 19, 1980

Appl. No.:

6/208425

Inventors:

David F. Bowman - Moorestown NJ

Assignee:

RCA Corporation - New York NY

International Classification:

H01P 512

US Classification:

333128

Abstract:

A power distribution network is disclosed for use in a frequency scan antenna element. A microwave signal applied to the input of the network is power divided and phase shifted so as to provide, at a plurality of output ports, signals of equal amplitude and, at a design frequency, phase equality. The signals appearing at the output ports are phase delayed relative to the signals at adjacent outputs such that an input signal frequency other than the design frequency presents a wave front across the output ports angled away from the normal to the output ports. The present invention discloses a series-parallel configuration of the power distribution network which provides improvements over both the pure-series and the pure-parallel configurations of the prior art.

US Patent:

45104697, Apr 9, 1985

Filed:

May 31, 1983

Appl. No.:

6/499395

Inventors:

David F. Bowman - Moorestown NJ

Assignee:

RCA Corporation - New York NY

International Classification:

H01P 116

US Classification:

333 21R

Abstract:

A mode converter is disclosed which selectively generates a predetermined higher order mode(s) from an incident fundamental mode. This mode converter comprises a dielectric region having an effective-dielectric-constant/thickness profile which is the same as the amplitude profile of the desired higher order mode(s).

US Patent:

45689431, Feb 4, 1986

Filed:

May 31, 1983

Appl. No.:

6/499396

Inventors:

David F. Bowman - Moorestown NJ

Assignee:

RCA Corporation - Princeton NJ

International Classification:

H01Q 1524
H01Q 1302

US Classification:

343756

Abstract:

The configuration of a waveguide antenna feed is determined by a shaped body of solid dielectric material which is coated with a conductive material. The conductive material functions as a waveguide wall for constraining electromagnetic wave propagation within the dielectric body. The body includes a mode converter and a coupler to a lead-in structure. A polarization converter, if desired, can be integral with the dielectric body.

US Patent:

45132925, Apr 23, 1985

Filed:

Sep 30, 1982

Appl. No.:

6/428586

Inventors:

David F. Bowman - Moorestown NJ

Assignee:

RCA Corporation - New York NY

International Classification:

H01Q 928

US Classification:

343795

Abstract:

A one-piece array antenna dipole radiating element is formed from a wide, thin conductor. This element is suitable for attachment to a microstrip or other feed circuit. The radiation element includes a dipole portion, a balanced transmission line portion and a balun portion. These various portions are formed by providing an appropriately shaped slot in the thin conductor.

US Patent:

41986407, Apr 15, 1980

Filed:

Jun 22, 1978

Appl. No.:

5/917889

Inventors:

David F. Bowman - Moorestown NJ

Assignee:

RCA Corporation - New York NY

International Classification:

H01Q 326

US Classification:

343754

Abstract:

A reflectarray antenna includes a primary feed that radiates a primary wave to a plurality of radiators where the wave is absorbed. A portion of the absorbed wave is resolved into first and second mutually orthogonal components at first and second feed ports, respectively, of a radiator. The first component is transmitted with a designated phase shift via a transmission phase shifter to the second feed port. Correspondingly, the second component is transmitted with the designated phase shift via the phase shifter to the first feed port. After the components are transmitted to the feed ports, they are re-radiated by the radiator in polarization states orthogonal to the ones in which they were absorbed.