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US2368663A - Broad band antenna - Google Patents

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Publication number
US2368663A
US2368663A US48707543A US2368663A US 2368663 A US2368663 A US 2368663A US 48707543 A US48707543 A US 48707543A US 2368663 A US2368663 A US 2368663A
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Prior art keywords
antenna
element
surface
disk
shield
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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Armig G Kandoian
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STC PLC
Federal Telephone and Radio Corp
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STC PLC
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QAERIALS
    • H01Q1/00Details of, or arrangements associated with, aerials
    • H01Q1/27Adaptation for use in or on movable bodies
    • H01Q1/28Adaptation for use in or on aircraft, missiles, satellites, or balloons
    • H01Q1/282Modifying the aerodynamic properties of the vehicle, e.g. projecting type aerials
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QAERIALS
    • H01Q9/00Electrically-short aerials having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04Resonant aerials
    • H01Q9/16Resonant aerials with feed intermediate between the extremities of the aerial, e.g. centre-fed dipole
    • H01Q9/28Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines

Description

Feb. 6, 1945. A, G, KANDOlAN I 2,368,663

BROAD BAND ANTENNA Filed May l5, 1945 INVENTOR.

4PM/G G. /fAA/oo/A/V BY '/57 /f Patented Feb. 6, 1945 BROAD BAND ANTENNA Armig G. Kandoan, New York, N. Y., a'ssgnor to Federal Telephone and Radio Corporation, Newark, N. J., a corporation of Delaware Application May 15, 1943, Serial No. 487,075

ICI. Z50-33) 8 Claims.

This invention relates to radio antennas and in particular to broad band antennas for operation at ultra-high frequencies.

In keeping with progress made during the last few years in the development of ultra-high frequency radio technique, and applications thereof to aircraft communication, direction finding, and so forth, it has become necessary to develop special antennas and antenna systems suitable for installation on such aircraft.- Flying conditions are such that these antennas must necessarily be small and rigid in'their construction and also offer a minimum of wind resistance, in order that the flying efficiency of the aircraft will be unimpaired. In accordance with my invention I have provided a small rigid antenna suitable for mounting on the surface of the fuselage or other component of the airplane structure and in certain embodiments I have also provided a streamlined protecting shield or housing covering or so cooperating with the construction of the antenna system as to greatly reduce wind resistance. This housing preferably takes the form of a blister which is o'nly slightly elevated from the normal surface of the aircraft on which it may be installed.

It is therefore an object of my invention to provide an antenna structure of great rigidity.

Another object of my invention is to provide an antenna structure suitable for mounting on aircraft in a manner such that it will produce a very low Wind resistance.

Another object of my invention is to provide -an antenna structure suitable for operation over a wide frequency band.

These and other objects of the invention will be best Iunderstood and appreciated from the following description of different embodiments thereof, described for purposes of illustration and shown in the accompanying drawing in which:

Fig. 1 is a cross-sectional view of an antenna structure according to one embodiment of my invention;

Fig. 2 is a cross-sectional view of an antenna structure in accordance with a second embodi-v ment of my invention.

Fig. 3 is a modification of the antenna structure shown in Fig. 2; and

Fig. 4 is a further modification of the antennal structure shown in Fig. 2.

Several forms of broad band antennas for operation at ultra-high frequencies are known in the prior art. In general, a characteristic feature of a broad band antenna lies in the fact that the antenna impedance is substantially constant over a wide frequency band. One way of obtaining this substantially constant impedance is to so devise the antenna structure that the energy flowing in the antenna encounters no abrupt change of impedance as it passes along the antenna and is radiated into space. One known form of broad band antenna having the above described characteristics consists of two conical surfaces of revolullon positioned so as to have a common axis and having their apexes adjacent each other. This form of antenna is dilcult to construct unless bracing members are employed to support the bases of the cones forming the antenna. These structural supports are usually positioned in the field of the radiated energy and unless formed of low-loss insulating material tend to absorb energy. Furthermore, if a structure of this type were employed as an aircraft antenna for example, it would introduce such great wind resistance as to be impractical.

In accordance with my invention, I retain one of the conical elements of an antenna such as above described but for the other conical element I substitute a disk which `may be either flat or slightly concave. The disk may be either round, square, Ior of other configuration, but because of symmetry the round form is preferred. Y

Referring now to Fig, 1, I have illustrated an antenna structure which would be suitable for use on an airplane. For example, the reference character 2 may representa portion of the surface of a fuselage. In general, however, and without reference to where the antenna may be mounted, this surface may be formed of either a conducting or insulating material depending upon the band of frequencies for which the antenna is to be employed, as will be described presently.

, The surface 2 may extend over a considerable area and although preferably substantially flat, it need not be necessarily so. Over a hole 4 in the surface 2 is mounted a conical antenna element 6. If the surface 2 is of metal, the element 6 may be welded thereto at the point 8. Other forms of mounting could obviously be employed. If the surface 2 is of insulating material, many forms of mounting could be devised by those skilled in this art but since the manner of mounting forms no part of my invention, no tion thereof are given.

The antenna element I0 consists of a round details or descripdsk mounted on the end of a rod I2, for examy. ple, by welding. The rod I2 forms the inner'conductor of a concentric conductor transmission line, the outer conductor I4 ofwhich, is connected to the apex I6 of the conical element 6.

The transmission line extends to a distant point where it may be connected to either a transmitter or toa receiver or both, shown in Fig. 1 as a high frequency translator I8. Insulating members and 22 space the transmission line conductors and also rigidly support the inner conductor I2, which in turn, rigidly supports the disk I0. -The impedance of the transmission line is such that it matches the impedance of the antenna system comprising the elements Ill and 6. If the antenna is employed for transmitting pur. poses, the high frequency waves, upon reaching the end of the transmission line, diverge and travel toward the outer extremities of the antenna elements from which point they spread into space in the form of radiation as is well understood in the art.

Referring to Fig. 2 I have illustrated another embodiment of my invention similar in most respects to the embodiment shown in Fig. 1, but wherein the antenna structure is completely shielded so as to reduce wind resistance to a minimum. The cone shaped antenna element 66 has a larger base in proportion to its height, than the munn The antenna element 62 may ebe'in the form of a metal disk or it may be sputtered or otherwise deposited on the inner or outer surface of the shield 64.

Fig. s inustrates a modification of the structure shown in Fig. 2 wherein the metal disk 62 is fastened to the outside surface of the shield 64. In this case it is necessary for the conductor I2 to pass through the shield where it may be fastened to the disk in some suitable manner such as shown in Fig. 3 as a clamping arrangement consisting of a head 66 and a nut 68. Should the disk 62 be formed by sputtering metal on the shield, the clamping arrangement could be as shown in Fig. 3, or the head 66 could be made flush with the outer surface of the shield end the metal of the disk sputtered thereon. It is preferable that the element 62 be on the concave side of the shield rather than on the outer or convex side since the shield thereby offers a mechanical protection to the antenna element.

As above stated the surface 2 may be of either metal `or insulating material. surface acts as an extension of the cone shaped antenna element and electrically it has the effect of lowering the band of frequencies over which an antenna of a givensize and shape would operate. In other words when constructing an antenna in accordance with my invention, the effect of thev surface '2 must be considered. If the surface is normally of insulating material and it is desired that an antenna structure be provided having a band width lower than it would normally be with an insulating surface, an artificial conducting surface placed over the insulating surface, could be provided. The extent to which this surface extends beyond the base of the cone determines vin some degree ther position of the frequency band. The greater the extension. the lower the band frequencies.

In Fig. 4 I have illustrated a modiflcationof If of metal, the

:,seaecs the manner in which the disk-shaped antenna element may be fastened to or mounted on the non-conducting shield. In this figure the shield 1I does not extend completely over the disk shaped antenna element, but Joins the periphery of the disk at 16 where it may be attached thereto by screws, threads, rivets or other fasteningV means.

While I have described above the principles of myinvention in connection with specific apparatus and particular modifications thereof, it is to be clearly understood that this description is made only by way of example and not as a lim.l

itation on the scope of my invention as set forth in the objects of my .invention and the accompanying claims.

I claim:

l. A broad band antenna comprising means defining an extended conducting surface, a substantially conical antenna element supported on said s urface and conductively connected thereto, said surface extending substantially perpendicular to the axis of said conical element, a disk-shaped antenna element, said diskshaped element being positioned adjacent the apex of said conical element. and a coaxial transmission line passing 'through said surface delining means and said conical element, the lnner conductor of said line being arranged to support said disk-shaped element and the outer conductor of the line being connected to the apex of said conical element.

2. A broad band antenna in accordance with claim'l and further comprising a non-conducting shield extending between said disk-shaped element and said surface.

3. A broad band antenna in accordance with claim 1 and further comprising a streamlined non-conducting shield .extending between said disk-shaped element and said surface, and means for supporting said disk-*shaped element from saidA shield.

4. A broad band antenna comprising means defining an extended conducting surface, a substantially conical antenna element supported on said surface and conductively connected thereto, a non-conducting streamlined yshield mounted on said surface and extending over said conical element, a disk-shaped element mounted on said shield, said disk-shaped element being positioned y adjacent the apex of said conical member, and

a transmission line comprising an inner and anl claim 4 wherein said disk-shaped element com' prises a metal deposit on a surface of said shield.

6. An antenna construction comprising a pair of cooperating antenna elements, and a wind shield housing the antenna elements at least in part to present therewith an outer substantially convexed surface, one of the antenna elements being disk-shaped with one side thereof being convex, and said shield being concave-convex with the concave side thereof arranged adjacent the convex surface of said disk-shaped element,

7. An antenna construction comprisinga pair of cooperating antenna elements, and a lwind shield housing the antenna elements at least lin part to present therewith an outer substantially' convexed surface, one of the antenna elements being disk-shaped and the shield being annular,

and means connecting the inner edge of said shield to the edge of said disk-shaped element.

- 8.' vAn antenna construction for use on aircraft and other devices where it is desirable to maintain wind resistance at a minimum comprising.

a conical antenna element to be disposed with the base thereof on the outer surface of the aircraft, a disk-shaped antenna element positioned adjacent the apex of the conical element, and

US2368663A 1943-05-15 1943-05-15 Broad band antenna Expired - Lifetime US2368663A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US2368663A US2368663A (en) 1943-05-15 1943-05-15 Broad band antenna

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US2368663A US2368663A (en) 1943-05-15 1943-05-15 Broad band antenna
GB820344A GB578457A (en) 1943-05-15 1944-05-01 Broad band antennas
ES182339A ES182339A1 (en) 1943-05-15 1948-02-13 Improvements in broadband antennas

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GB (1) GB578457A (en)

Cited By (51)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2418084A (en) * 1945-11-05 1947-03-25 United Air Lines Inc Antenna
US2431124A (en) * 1946-02-20 1947-11-18 Electronics Res Inc Antenna
US2448713A (en) * 1944-12-02 1948-09-07 Rca Corp Radio listening buoy
US2449562A (en) * 1944-10-03 1948-09-21 Us Sec War Antenna
US2478913A (en) * 1944-02-07 1949-08-16 Stromberg Carlson Co Dipole antenna
US2480143A (en) * 1946-09-11 1949-08-30 Standard Telephones Cables Ltd Directive antenna system
US2503109A (en) * 1946-11-06 1950-04-04 Republic Aviat Corp Antenna assembly
US2505751A (en) * 1946-09-27 1950-05-02 John T Bolljahn Broad band antenna
US2508438A (en) * 1945-10-16 1950-05-23 Douglas W Wilson Broad band antenna
US2516500A (en) * 1946-03-26 1950-07-25 Alford Andrew Electrical apparatus
US2531432A (en) * 1948-10-01 1950-11-28 Fed Telecomm Lab Inc Broad band antenna system
US2532551A (en) * 1945-02-19 1950-12-05 George A Jarvis Biconical electromagnetic horn antenna
US2533236A (en) * 1947-10-03 1950-12-12 Int Standard Electric Corp Antenna array
US2541107A (en) * 1947-04-12 1951-02-13 Farnsworth Res Corp Low-clearance antenna
US2549143A (en) * 1947-11-06 1951-04-17 Bell Telephone Labor Inc Microwave broadcast antenna
US2564675A (en) * 1946-04-12 1951-08-21 Louis H Crook High-frequency power radiating and distributing means for antenna and heating systems
US2566491A (en) * 1946-03-15 1951-09-04 Belmont Radio Corp Antenna construction
US2572995A (en) * 1946-03-26 1951-10-30 Allen S Dunbar Antenna
US2589818A (en) * 1946-06-25 1952-03-18 Us Executive Secretary Of The Antenna
US2637814A (en) * 1948-09-03 1953-05-05 Johnson William Arthur Aerial system
US2644090A (en) * 1948-03-05 1953-06-30 Dorne Arthur Recessed slot antenna
US2659003A (en) * 1946-04-30 1953-11-10 Dorne Arthur Antenna mountable in small spaces
US2659002A (en) * 1946-03-29 1953-11-10 Price M Keeler Split truncated cone-antenna
US2689302A (en) * 1950-06-20 1954-09-14 John A Albano Zero drag vertical "i" antenna
US2700104A (en) * 1949-04-29 1955-01-18 Airborne Instr Lab Inc Antenna feed system
US2701307A (en) * 1948-07-02 1955-02-01 Nat Res Dev Radio antenna for aircraft
US2724772A (en) * 1950-05-10 1955-11-22 Decca Record Co Ltd Aircraft radio antennae
US2955776A (en) * 1958-10-24 1960-10-11 Boeing Co Aircraft with integral antenna
US2977593A (en) * 1947-11-04 1961-03-28 Raytheon Co Dielectric nose cone antenna
US2996713A (en) * 1956-11-05 1961-08-15 Antenna Engineering Lab Radial waveguide antenna
US2998605A (en) * 1957-07-09 1961-08-29 Hazeltine Research Inc Antenna system
US3680131A (en) * 1970-11-16 1972-07-25 Bendix Corp Low profile antenna mounted on a watercraft
US3987456A (en) * 1974-08-01 1976-10-19 Lignes Telegraphiques Et Telephoniques Wide relative frequency band and reduced size-to-wavelength ratio antenna
EP0117017A1 (en) * 1983-01-20 1984-08-29 Hazeltine Corporation Low-profile omni-antenna
US4608572A (en) * 1982-12-10 1986-08-26 The Boeing Company Broad-band antenna structure having frequency-independent, low-loss ground plane
US4635068A (en) * 1985-06-05 1987-01-06 Hazeltine Corporation Double-tuned disc loaded monopole
WO2000057512A1 (en) * 1999-03-23 2000-09-28 Emc Automation, Inc. Extensible top-loaded biconical antenna
EP1289058A2 (en) * 2001-08-01 2003-03-05 Lucent Technologies Inc. Discone antenna
US20040201529A1 (en) * 2000-12-27 2004-10-14 Chadwick George G. Antenna
US20040201534A1 (en) * 2000-12-27 2004-10-14 Yoshihiro Hagiwara Method and apparatus for improving antenna efficiency
US20050057411A1 (en) * 2003-09-09 2005-03-17 Bae Systems Information And Electronic Systems Integration, Inc. Collapsible wide band width discone antenna
US20050168392A1 (en) * 2004-01-05 2005-08-04 Cocomo Mb Communications, Inc. Antenna efficiency
US20050195117A1 (en) * 2000-08-10 2005-09-08 Cocomo Mb Communications, Inc. Antenna
US20060250315A1 (en) * 2005-05-04 2006-11-09 Harris Corporation Conical dipole antenna and associated methods
US20060284779A1 (en) * 2005-06-20 2006-12-21 Harris Corporation, Corporation Of The State Of Delaware Inverted feed discone antenna and related methods
JP2007043342A (en) * 2005-08-01 2007-02-15 Antenna Technology Inc Discone antenna
US20090289865A1 (en) * 2008-05-23 2009-11-26 Harris Corporation Folded conical antenna and associated methods
US20090289866A1 (en) * 2008-05-23 2009-11-26 Harris Corporation, Corporation Of The State Of Deleware Broadband terminated discone antenna and associated methods
US20150303588A1 (en) * 2013-08-09 2015-10-22 Harris Corporation Broadband dual polarization omni-directional antenna and associated methods
US9293815B1 (en) 2013-09-24 2016-03-22 The United States Of America As Represented By The Secretary Of The Navy Ultra-wideband hemispherical teardrop antenna with a conical ground
US9692134B2 (en) 2013-08-09 2017-06-27 Harris Corporation Broadband dual polarization omni-directional antenna with dual conductive antenna bodies and associated methods

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2646460A (en) * 1950-05-26 1953-07-21 Cinch Mfg Corp Tube shield and socket mounting assembly

Cited By (63)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2478913A (en) * 1944-02-07 1949-08-16 Stromberg Carlson Co Dipole antenna
US2449562A (en) * 1944-10-03 1948-09-21 Us Sec War Antenna
US2448713A (en) * 1944-12-02 1948-09-07 Rca Corp Radio listening buoy
US2532551A (en) * 1945-02-19 1950-12-05 George A Jarvis Biconical electromagnetic horn antenna
US2508438A (en) * 1945-10-16 1950-05-23 Douglas W Wilson Broad band antenna
US2418084A (en) * 1945-11-05 1947-03-25 United Air Lines Inc Antenna
US2431124A (en) * 1946-02-20 1947-11-18 Electronics Res Inc Antenna
US2566491A (en) * 1946-03-15 1951-09-04 Belmont Radio Corp Antenna construction
US2516500A (en) * 1946-03-26 1950-07-25 Alford Andrew Electrical apparatus
US2572995A (en) * 1946-03-26 1951-10-30 Allen S Dunbar Antenna
US2659002A (en) * 1946-03-29 1953-11-10 Price M Keeler Split truncated cone-antenna
US2564675A (en) * 1946-04-12 1951-08-21 Louis H Crook High-frequency power radiating and distributing means for antenna and heating systems
US2659003A (en) * 1946-04-30 1953-11-10 Dorne Arthur Antenna mountable in small spaces
US2589818A (en) * 1946-06-25 1952-03-18 Us Executive Secretary Of The Antenna
US2480143A (en) * 1946-09-11 1949-08-30 Standard Telephones Cables Ltd Directive antenna system
US2505751A (en) * 1946-09-27 1950-05-02 John T Bolljahn Broad band antenna
US2503109A (en) * 1946-11-06 1950-04-04 Republic Aviat Corp Antenna assembly
US2541107A (en) * 1947-04-12 1951-02-13 Farnsworth Res Corp Low-clearance antenna
US2533236A (en) * 1947-10-03 1950-12-12 Int Standard Electric Corp Antenna array
US2977593A (en) * 1947-11-04 1961-03-28 Raytheon Co Dielectric nose cone antenna
US2549143A (en) * 1947-11-06 1951-04-17 Bell Telephone Labor Inc Microwave broadcast antenna
US2644090A (en) * 1948-03-05 1953-06-30 Dorne Arthur Recessed slot antenna
US2701307A (en) * 1948-07-02 1955-02-01 Nat Res Dev Radio antenna for aircraft
US2637814A (en) * 1948-09-03 1953-05-05 Johnson William Arthur Aerial system
US2531432A (en) * 1948-10-01 1950-11-28 Fed Telecomm Lab Inc Broad band antenna system
US2700104A (en) * 1949-04-29 1955-01-18 Airborne Instr Lab Inc Antenna feed system
US2724772A (en) * 1950-05-10 1955-11-22 Decca Record Co Ltd Aircraft radio antennae
US2689302A (en) * 1950-06-20 1954-09-14 John A Albano Zero drag vertical "i" antenna
US2996713A (en) * 1956-11-05 1961-08-15 Antenna Engineering Lab Radial waveguide antenna
US2998605A (en) * 1957-07-09 1961-08-29 Hazeltine Research Inc Antenna system
US2955776A (en) * 1958-10-24 1960-10-11 Boeing Co Aircraft with integral antenna
US3680131A (en) * 1970-11-16 1972-07-25 Bendix Corp Low profile antenna mounted on a watercraft
US3987456A (en) * 1974-08-01 1976-10-19 Lignes Telegraphiques Et Telephoniques Wide relative frequency band and reduced size-to-wavelength ratio antenna
US4608572A (en) * 1982-12-10 1986-08-26 The Boeing Company Broad-band antenna structure having frequency-independent, low-loss ground plane
EP0117017A1 (en) * 1983-01-20 1984-08-29 Hazeltine Corporation Low-profile omni-antenna
US4635068A (en) * 1985-06-05 1987-01-06 Hazeltine Corporation Double-tuned disc loaded monopole
WO2000057512A1 (en) * 1999-03-23 2000-09-28 Emc Automation, Inc. Extensible top-loaded biconical antenna
US6154182A (en) * 1999-03-23 2000-11-28 Emc Automation, Inc. Extensible top-loaded biconical antenna
US20050195117A1 (en) * 2000-08-10 2005-09-08 Cocomo Mb Communications, Inc. Antenna
US20040201534A1 (en) * 2000-12-27 2004-10-14 Yoshihiro Hagiwara Method and apparatus for improving antenna efficiency
US6891512B2 (en) 2000-12-27 2005-05-10 Cocomo Mb Cojmmunications, Inc. Antenna
US20040201529A1 (en) * 2000-12-27 2004-10-14 Chadwick George G. Antenna
US6956534B2 (en) * 2000-12-27 2005-10-18 Cocomo Mb Communications, Inc. Method and apparatus for improving antenna efficiency
US6697031B2 (en) 2001-08-01 2004-02-24 Lucent Technologies Inc Antenna
EP1289058A3 (en) * 2001-08-01 2003-03-26 Lucent Technologies Inc. Discone antenna
EP1289058A2 (en) * 2001-08-01 2003-03-05 Lucent Technologies Inc. Discone antenna
US20050057411A1 (en) * 2003-09-09 2005-03-17 Bae Systems Information And Electronic Systems Integration, Inc. Collapsible wide band width discone antenna
US6967626B2 (en) * 2003-09-09 2005-11-22 Bae Systems Information And Electronic Systems Integration Inc. Collapsible wide band width discone antenna
US20050168392A1 (en) * 2004-01-05 2005-08-04 Cocomo Mb Communications, Inc. Antenna efficiency
US20060250315A1 (en) * 2005-05-04 2006-11-09 Harris Corporation Conical dipole antenna and associated methods
US7170461B2 (en) 2005-05-04 2007-01-30 Harris Corporation Conical dipole antenna and associated methods
US20060284779A1 (en) * 2005-06-20 2006-12-21 Harris Corporation, Corporation Of The State Of Delaware Inverted feed discone antenna and related methods
US7286095B2 (en) 2005-06-20 2007-10-23 Harris Corporation Inverted feed discone antenna and related methods
JP2007043342A (en) * 2005-08-01 2007-02-15 Antenna Technology Inc Discone antenna
JP4704844B2 (en) * 2005-08-01 2011-06-22 アンテナテクノロジー株式会社 Discone antenna
US20090289865A1 (en) * 2008-05-23 2009-11-26 Harris Corporation Folded conical antenna and associated methods
US7864127B2 (en) 2008-05-23 2011-01-04 Harris Corporation Broadband terminated discone antenna and associated methods
US7973731B2 (en) 2008-05-23 2011-07-05 Harris Corporation Folded conical antenna and associated methods
US20090289866A1 (en) * 2008-05-23 2009-11-26 Harris Corporation, Corporation Of The State Of Deleware Broadband terminated discone antenna and associated methods
US9768520B2 (en) * 2013-08-09 2017-09-19 Harris Corporation Broadband dual polarization omni-directional antenna and associated methods
US20150303588A1 (en) * 2013-08-09 2015-10-22 Harris Corporation Broadband dual polarization omni-directional antenna and associated methods
US9692134B2 (en) 2013-08-09 2017-06-27 Harris Corporation Broadband dual polarization omni-directional antenna with dual conductive antenna bodies and associated methods
US9293815B1 (en) 2013-09-24 2016-03-22 The United States Of America As Represented By The Secretary Of The Navy Ultra-wideband hemispherical teardrop antenna with a conical ground

Also Published As

Publication number Publication date Type
GB578457A (en) 1946-06-28 application
ES182339A1 (en) 1948-04-01 application

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