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Publication numberUS3530478 A
Publication typeGrant
Publication dateSep 22, 1970
Filing dateMar 27, 1968
Priority dateMar 27, 1968
Publication numberUS 3530478 A, US 3530478A, US-A-3530478, US3530478 A, US3530478A
InventorsCorzine Robert G, Mosko Joseph A
Original AssigneeUs Navy
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Frequency independent log periodic slot multi-mode antenna array
US 3530478 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Sept. 22, 1970 R G QORZINE ETAL 3,530,478



Sept. 22, 1970 R. s. CORZINE ET AL 3,530,478


United States Patent 3,530,478 FREQUENCY INDEPENDENT LOG PERIODIC SLOT MULTI-MODE ANTENNA ARRAY Robert G. Corzine and Joseph A. Mosko, China Lake, Calif., assignors to the United States of America as represented by the Secretary of the Navy Filed Mar. 27, 1968, Ser. No. 716,650 Int. Cl. H01q 11/10, 13/10 US. Cl. 343-771 3 Claims ABSTRACT OF THE DISCLOSURE A conical antenna array comprising two electrically conductive sheets with rows of slot pairs lying along logperiodically expanding concentric circles, and -H-guide type waveguides capable of exciting adjacent rows of slot pairs.


The present invention is comprised of six identical triangular elements, with coinciding apices, wrapped on a cone.

Each element consists of two parallel electrically conductive plates, with a dielectric slab disposed between them. Two rows of slots lie on log periodically expanding circles; and when the elements are wrapped on a cone, the shorter slots lie closer to the apex of the cone than the longer slots.

The antenna array receives excitation from H-guide type waveguides which are created by the dielectric slabs which may be placed between the joints of any two elements.

Because the excitation occurs between any two elements, pairs of rows of slots are excited rather than individual rows. This aperture sharing technique permits a broader beam angle than heretofore possible.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a side view, partially in cross-section, of a preferred embodiment of the invention;

FIG. 2 is an exploded view of one of the elements which comprise the embodiment of FIG. 1;

FIG. 3 is a top view of the embodiment of FIG. 1; and

FIG. 4 is a perspective view, partially in cross section of a second embodiment of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 and FIG. 3 show a conical array 26 consisting of six identical elements 25, one of which is shown 11]. FIG. 2.

Referring to FIG. 2, element 25 is comprised of two parallel truncated triangular conductive plates 10 and 16. Plate 16 has log periodically expanding slots 11 cut into it so that the shorter slots lie near the virtual apex of the tuncated triangle, and the longer slots lie near the base of the tuncated triangle.

Spacer bars 12 maintain a separation between conductive plates 10 and 16. In one embodiment of the invention, spacer bars 12 are a dielectric material which can be used for exciting the antenna.

Referring to FIG. 1 and FIG. 2, excitation normally occurs via dielectric slab 13 which acts as an H-guide type waveguide between conductive plates 10 and 16. Blocks 14 and strip 15 form a launcher for propagating electromagnetic waves along dielectric slab 13.

Absorbers 24, which may be made of Eccosorb LS-26, or aluminum backed Resonant Solid Absorbers RSC, or RS-X manufactured by B. F. Goodrich, load the antenna array, prevent energy leakage and provide insulation between the adjacent elements 25 of antenna 26. Slot 17 is provided to hold absorbing material 24, such as Eccosorb LS-26, to provide termination.

Cap 18 is provided, as shown in FIG. 1 and FIG. 3, for streamlining in the event that antenna array 26 is mounted on the nose of an aircraft.

FIG. 3 also shows an element 25 consisting of two rows of log periodically expanding slots cut into conductive material 10.

FIG. 4 shows a second embodiment of the invention.

Two semicircular conducitve plates 19 and 20 are disposed in space parallel to one another. Slots 11, cut into plate 19, expand log periodically from the center of the semicircle to its perimeter. Spacers 23 separate the two semicircular plates.

Dielectric slabs :13 are placed between each row of slots. For excitation, launcher 21 is fastened to the outer perimeter of the semicircle. Dielectric slab 13 is removed, and a longer dielectric slab 22 is inserted in its place. Thus dielectric slab 22 causes H-guide type hybrid waves to propagate between plates 19 and 20 causing aperture sharing to occur.

It should be noted that any number of dielectric slabs 13 may be removed and replaced by excitation slabs 22 and launchers 21.

Obviously many modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that, within the scope of the appended claims, the invention may be practiced otherwise than as specifically described.

The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.

What is claimed is:

1. A log periodic antenna comprising:

a first electrically conductive plate;

a second electrically conductive plate,

said second plate:

having adjacent pairs of rows of log periodically spaced slots, and being disposed in spaced relation to the first electrically conductive plate and defining an area in which electromagnetic waves of an H-guide mode are capable of propagating; a series of dielectric slabs placed between said conductive plates in the spaces separating the adjacent rows of log periodically spaced radiating slots; and

feed means for exciting each pair of saidrows comprising:

means for exciting said dielectric slabs to propagate electromagnetic waves between the two plates in an H-mode. 2. The antenna of claim 1 wherein said first and second plates are semicircular.

3. The antenna of claim 1 wherein said first and second plates are trapezoidal; and a plurality of said first and second plates are shaped to form a conical frustum.

4 References Cited UNITED STATES PATENTS ELI LIEBERMAN, Primary Examiner US. Cl. X.R. 343-792'.5, 708

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3218644 *Jun 19, 1963Nov 16, 1965Collins Radio CoFrequency independent slot antenna
US3233242 *May 31, 1961Feb 1, 1966Textron IncH-guide microwave antenna
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3713165 *Oct 5, 1970Jan 23, 1973Ericsson Telefon Ab L MAntenna for strip transmission lines
US3987454 *Jun 23, 1975Oct 19, 1976Gte Sylvania Inc.Log-periodic longitudinal slot antenna array excited by a waveguide with a conductive ridge
US3990079 *Jun 23, 1975Nov 2, 1976Gte Sylvania IncorporatedLog-periodic longitudinal slot antenna array excited by a waveguide with a conductive ridge
US4518967 *Mar 5, 1982May 21, 1985Ford Aerospace & Communications CorporationTapered-width leaky-waveguide antenna
US4594595 *Apr 18, 1984Jun 10, 1986Sanders Associates, Inc.Circular log-periodic direction-finder array
US4847627 *Sep 8, 1987Jul 11, 1989Lockheed CorporationCompact wave antenna system
US4980692 *Nov 29, 1989Dec 25, 1990Ail Systems, Inc.Frequency independent circular array
US5239311 *Apr 6, 1992Aug 24, 1993Arimura Giken Kabushiki KaishaFlat slot array antenna
US5327147 *Jul 24, 1992Jul 5, 1994Alcatel EspaceMicrowave array antenna having sources of different widths
US5347287 *Apr 19, 1991Sep 13, 1994Hughes Missile Systems CompanyConformal phased array antenna
US5416492 *Mar 31, 1993May 16, 1995Yagi Antenna Co., Ltd.Electromagnetic radiator using a leaky NRD waveguide
US6239757 *Apr 22, 1997May 29, 2001Murata Manufacturing Co., Ltd.Communication module for a means of transportation
US7701403Nov 30, 2007Apr 20, 2010Airbus Deutschland GmbhWall element with an antenna device
US9041614 *Feb 4, 2013May 26, 2015Raytheon CompanyRF aperture coldplate
US20080158071 *Nov 30, 2007Jul 3, 2008Airbus Deutschland GmbhWall element with an antenna device
DE102006056890A1 *Dec 1, 2006Jun 5, 2008Airbus Deutschland GmbhWall element for e.g. cockpit, of aircraft, has integrated antenna device designed such that high frequency radiation is emitted towards radiation area, where radiation is absorbed towards absorbing area
DE102006056890B4 *Dec 1, 2006Aug 25, 2011Airbus Operations GmbH, 21129Wandelement mit einer Antenneneinrichtung
EP0250082A2 *May 11, 1987Dec 23, 1987British Aerospace Public Limited CompanyVehicleincluding a radar antenna
U.S. Classification343/771, 343/708, 343/792.5
International ClassificationH01Q1/28, H01Q21/00, H01Q1/27
Cooperative ClassificationH01Q21/0056, H01Q1/281, H01Q21/0031
European ClassificationH01Q21/00D4, H01Q21/00D5B1A, H01Q1/28B