|Publication number||US3530478 A|
|Publication date||Sep 22, 1970|
|Filing date||Mar 27, 1968|
|Priority date||Mar 27, 1968|
|Publication number||US 3530478 A, US 3530478A, US-A-3530478, US3530478 A, US3530478A|
|Inventors||Corzine Robert G, Mosko Joseph A|
|Original Assignee||Us Navy|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (2), Referenced by (22), Classifications (12)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Sept. 22, 1970 R G QORZINE ETAL 3,530,478
FREQUENCY INDEPENDENT LOG PERIODIC SLOT MULTI-MODE ANTENNA ARRAY Filed March 27, 1968 2 Sheets-Sheet l ITIF ML v IO F l G. l. 26
INVENTORS. ROBERT G. CORZINE JOSEPH A. MOSKO BY 24 I4 2 ROY MILLE R ATTORNEY.
Sept. 22, 1970 R. s. CORZINE ET AL 3,530,478
FREQUENCY INDEPENDENT LOG PERIODIC SLOT MULTI-MODE ANTENNA ARRAY Filed March 27, 1968 2 Sheets-Sheet 8 FIG. 4.
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.
BACKGROUND OF THE INVENTION SUMMARY OF THE INVENTION:
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
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US3218644 *||Jun 19, 1963||Nov 16, 1965||Collins Radio Co||Frequency independent slot antenna|
|US3233242 *||May 31, 1961||Feb 1, 1966||Textron Inc||H-guide microwave antenna|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3713165 *||Oct 5, 1970||Jan 23, 1973||Ericsson Telefon Ab L M||Antenna for strip transmission lines|
|US3987454 *||Jun 23, 1975||Oct 19, 1976||Gte Sylvania Inc.||Log-periodic longitudinal slot antenna array excited by a waveguide with a conductive ridge|
|US3990079 *||Jun 23, 1975||Nov 2, 1976||Gte Sylvania Incorporated||Log-periodic longitudinal slot antenna array excited by a waveguide with a conductive ridge|
|US4518967 *||Mar 5, 1982||May 21, 1985||Ford Aerospace & Communications Corporation||Tapered-width leaky-waveguide antenna|
|US4594595 *||Apr 18, 1984||Jun 10, 1986||Sanders Associates, Inc.||Circular log-periodic direction-finder array|
|US4847627 *||Sep 8, 1987||Jul 11, 1989||Lockheed Corporation||Compact wave antenna system|
|US4980692 *||Nov 29, 1989||Dec 25, 1990||Ail Systems, Inc.||Frequency independent circular array|
|US5239311 *||Apr 6, 1992||Aug 24, 1993||Arimura Giken Kabushiki Kaisha||Flat slot array antenna|
|US5327147 *||Jul 24, 1992||Jul 5, 1994||Alcatel Espace||Microwave array antenna having sources of different widths|
|US5347287 *||Apr 19, 1991||Sep 13, 1994||Hughes Missile Systems Company||Conformal phased array antenna|
|US5416492 *||Mar 31, 1993||May 16, 1995||Yagi Antenna Co., Ltd.||Electromagnetic radiator using a leaky NRD waveguide|
|US6239757 *||Apr 22, 1997||May 29, 2001||Murata Manufacturing Co., Ltd.||Communication module for a means of transportation|
|US7701403||Nov 30, 2007||Apr 20, 2010||Airbus Deutschland Gmbh||Wall element with an antenna device|
|US9041614 *||Feb 4, 2013||May 26, 2015||Raytheon Company||RF aperture coldplate|
|US9620866 *||Sep 26, 2013||Apr 11, 2017||Raytheon Company||Methods and apparatus for fragmented phased array radar|
|US20080158071 *||Nov 30, 2007||Jul 3, 2008||Airbus Deutschland Gmbh||Wall element with an antenna device|
|US20100001918 *||Jul 4, 2005||Jan 7, 2010||Telefonaktiebolaget Lm Ericsson (Publ)||Passive repeater antenna|
|US20140085143 *||Sep 26, 2013||Mar 27, 2014||Raytheon Company||Methods and apparatus for fragmented phased array radar|
|DE102006056890A1 *||Dec 1, 2006||Jun 5, 2008||Airbus Deutschland Gmbh||Wall 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, 2006||Aug 25, 2011||Airbus Operations GmbH, 21129||Wandelement mit einer Antenneneinrichtung|
|EP0250082A2 *||May 11, 1987||Dec 23, 1987||British Aerospace Public Limited Company||Vehicleincluding a radar antenna|
|EP0250082A3 *||May 11, 1987||Mar 14, 1990||British Aerospace Public Limited Company||Vehicleincluding a radar antenna|
|U.S. Classification||343/771, 343/708, 343/792.5|
|International Classification||H01Q1/28, H01Q21/00, H01Q1/27|
|Cooperative Classification||H01Q21/0056, H01Q1/281, H01Q21/0031|
|European Classification||H01Q21/00D4, H01Q21/00D5B1A, H01Q1/28B|