Improved circularly polarized antenna

Antenna includes two sets of linearly polarized elements. Each set contains slots in parallel array. Sets are mutually orthogonal and are driven in phase quadrature. By changing lengths of slots or their separations, antenna beamwidth can be changed over wide range. Similar results are achieved with dipole configuration

Circularly Polarized Antenna with Wide Projection and Range: A Concept

The slotted antenna structure discussed in this tech brief radiates a circularly polarized beam pattern over a wide angle. The basic structure, composed of waveguide slots, can be flush mounted in an airplane or spacecraft, and could be used in the communication link between an airplane and an air traffic satellite

Index to NASA Tech Briefs, 1974

The following information was given for 1974: (1) abstracts of reports dealing with new technology derived from the research and development activities of NASA or the U.S. Atomic Energy Commission, arranged by subjects: electronics/electrical, electronics/electrical systems, physical sciences, materials/chemistry, life sciences, mechanics, machines, equipment and tools, fabrication technology, and computer programs, (2) indexes for the above documents: subject, personal author, originating center

NASA patent abstracts bibliography: A continuing bibliography. Section 2: Indexes (supplement 05)

For abstract, see N75-13677

NASA patent abstracts bibliography: A continuing bibliography. Section 2: Indexes (supplement 06)

For abstract, see N75-20149

NASA patent abstracts bibliography: A continuing bibliography. Section 1: Abstracts (supplement 22)

Entries for over 4000 patents and patent applications citations for the period May 1969 through December 1982 are listed. Subject, invention, source, number, and accession number indexes are included

NASA patent abstracts bibliography: A continuing bibliography. Section 2: Indexes (supplement 23)

Entries for 4000 patent and patent applications citations for the period May 1969 through June 1983 are listed. Subject, invention, source, number, and accession number indexes are included

Index to NASA Tech Briefs, 1970

Index to NASA 1970 Tech Brie

NASA patent abstracts bibliography: A continuing bibliography. Section 2: Indexes (supplement 27)

A subject index is provided for over 4300 patents and patent applications for the period May 1969 through June 1985. Additional indexes lists personal authors, corporate authors, contract numbers, NASA case numbers, U.S. patent class numbers, U.S. Patent numbers, and NASA accession numbers

NASA patent abstracts bibliography: A continuing bibliography. Section 2: Indexes (supplement 28)

A subject index is provided for over 4800 patents and patent applications for the period May 1969 through December 1985. Additional indexes list personal authors, corporate authors, contract numbers, NASA case numbers, U.S. patent class numbers, U.S. Patent numbers, and NASA accession numbers