Photo Source/Description

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Array of four log-periodic dipole arrays used for tracking.

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Array of four triangular tooth log-periodic antennas used for reflector feeds.

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Details of infinite-balun feed for a planar log-spiral antenna.

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Conical log-spiral antenna showing (left) spiral pattern etched on flat sheet of teflon-impregnated fiberglass and (right) after forming into conical shape and adding feed coax to one arm and dummy cable (to improve symmetry) to the other arm.

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Vertically polarized log-periodic array for use at HF.

Planar log-spiral slot antenna

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Planar log-spiral slot antenna.

Vertically polarized log-periodic zigzag antenna

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Vertically polarized log-periodic zigzag antenna with horizontal phasing stubs, sometimes called the "bent LP zigzag".

University of Illinois radio telescope for extra-galactic sources

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

University of Illinois radio telescope used to map extra-galactic sources, a 400 x 600 foot cylindrical parabolic reflector made by covering a shaped-earth excavation with asphalt and wire screen. A catwalk at 155 feet above the ground supports about 400 conical log-spiral antennas along the focal line. Scanning in one plane was achieved by the earth's rotation; in the other plane by physically rotating the circularly polarized spirals. The log-spiral antennas were designed by Prof. J. D. Dyson, the feed system was designed by Prof. Y. T. Lo.

University of Illinois radio telescope

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

University of Illinois radio telescope.

Conical log-spiral antennas

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Conical log-spiral antennas

Array of two conical log-spiral antennas

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Array of two conical log-spiral antennas.

Log-periodic array of helical dipoles

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Log-periodic array of helical dipoles.

Array of four conical log-spiral antennas

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Array of four conical log-spiral antennas.

Early diagram of scaled cells of a general log-periodic structure

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Early diagram of scaled cells of a general log-periodic structure.

Four-arm conical log-spiral antenna #1

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Four-arm conical log-spiral antenna constructed from coaxial cable.

Four-arm conical log-spiral antenna #2

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Four-arm conical log-spiral antenna constructed from coaxial cable.

Early commercial version of a wire-outline log-periodic array

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Early commercial version of a wire-outline log-periodic triangular tooth array.

Horizontal array of two log-periodic dipole arrays

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Horizontal array of two log-periodic dipole arrays.

Two conical log-spiral antennas; (left) wide arm (right) cable arm

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Two conical log-spiral antennas; (left) wide arm (right) cable arm.

Small scale model of log-periodic resonant-V array

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Small scale model of log-periodic resonant-V array.

Conical log-spiral antenna

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Conical log-spiral antenna.

Small scale model of a log-periodic dipole array

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Small scale model of a log-periodic dipole array.

Loosely wrapped four-arm conical log-spiral antenna

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Loosely wrapped four-arm conical log-spiral antenna for producing hemispherical coverage.

Reflector feed

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Reflector feed.

Planar log-spiral slot antenna

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Planar log-spiral slot antenna.

Conical log-spiral antenna made from coaxial cable #1

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Conical log-spiral antenna made from coaxial cable.

Conical log-spiral antenna made from coaxial cable #2

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Conical log-spiral antenna made from coaxial cable.

Conical log-spiral antenna made from coaxial cable #3

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Conical log-spiral antenna made from coaxial cable.

Two-element array of conical log-spiral antennas

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Two-element array of conical log-spiral antennas.

Conical log-spiral for University of Illinois radio telescope #1

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Conical log-spiral for University of Illinois radio telescope.

Conical log-spiral for University of Illinois radio telescope #2

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Conical log-spiral for University of Illinois radio telescope.

Quad array of conical log-spiral antennas

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Quad array of conical log-spiral antennas.

End-on view of four-arm conical log-spiral antennas

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

End-on view of four-arm conical log-spiral antennas.

Two-element array of conical log-spiral antennas with radome

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Two-element array of conical log-spiral antennas with radome.

Conical log-spiral for University of Illinois radio telescope

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Conical log-spiral for University of Illinois radio telescope.

Log-spiral antenna on an early navigation satellite

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Log-spiral antenna on an early navigation satellite.

Small scale model of a log-periodic dipole array

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Small scale model of a log-periodic dipole array.

Conical log-spiral antenna

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Conical log-spiral antenna.

Commercial conical log-spiral antenna

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Commercial conical log-spiral antenna.

Conical log-spiral antenna #1

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Conical log-spiral antenna.

Conical log-spiral antenna #2

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Conical log-spiral antenna.

Conical log-spiral antenna #3

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Conical log-spiral antenna.

Conical log-spiral antenna #4

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Conical log-spiral antenna.

Conical log-spiral antenna #5

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Conical log-spiral antenna.

Conical log-spiral antenna #6

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Conical log-spiral antenna.

Four overlapping parabolic reflectors #1

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Four overlapping parabolic reflectors fed with log-periodic dipole arrays.

Four overlapping parabolic reflectors #2

Source:

Professor Paul Mayes, University of Illinois at Urbana-Champaign

Description:

Four overlapping parabolic reflectors fed with log-periodic dipole arrays.