US3151328A - Open ring antenna - Google Patents

Open ring antenna Download PDF

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Publication number
US3151328A
US3151328A US206248A US20624862A US3151328A US 3151328 A US3151328 A US 3151328A US 206248 A US206248 A US 206248A US 20624862 A US20624862 A US 20624862A US 3151328 A US3151328 A US 3151328A
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United States
Prior art keywords
conductive
antenna
ring
plane
members
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Expired - Lifetime
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US206248A
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English (en)
Inventor
Joseph M Boyer
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Northrop Grumman Corp
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Northrop Grumman Corp
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Filing date
Publication date
Priority to NL290469D priority Critical patent/NL290469A/xx
Priority to BE629886D priority patent/BE629886A/xx
Priority to US26196D priority patent/USRE26196E/en
Priority to US206248A priority patent/US3151328A/en
Application filed by Northrop Grumman Corp filed Critical Northrop Grumman Corp
Priority to GB7429/63A priority patent/GB1018861A/en
Priority to FR927246A priority patent/FR1353210A/fr
Priority to DEN22885A priority patent/DE1297709B/de
Priority to CH348463A priority patent/CH417704A/de
Priority to JP1333963A priority patent/JPS3926428B1/ja
Application granted granted Critical
Publication of US3151328A publication Critical patent/US3151328A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
    • H01Q9/265—Open ring dipoles; Circular dipoles

Definitions

  • This invention relates to radio antennas, and particularly to those used for the sending and reception of signals in the very low radio frequency portions of the spectrum extending from kilocycles to 500 kilocycles.
  • the principal object of the present invention is to provide an efiicient, resonant antenna which achieves its electrical aperture in the azimuthal plane, is vertically polarized, and eliminates the need for structures of very great physical height.
  • 'Another object of this invention is to provide an efiicient antenna which incorporates means for instantaneous tuning for use in frequency changes during operation.
  • Still another object of the invention is to provide an antenna structure having an intrinsic positive reactive component when out of tune, so that resonance may be achieved by means of low loss, negative reactors.
  • a still further object of the invention is to provide an antenna having a variable range of real input impedance at resonance so that it may be efliciently connected directly ice to various types of radio apparatus or transmission lines without need for impedance matching networks.
  • an object of the present invention to provide an antenna which radiates a vertically polarized wave when mounted parallel to the earth plane, with a distribution of radiated energy essentially the same as that produced by a full quarter-wavelength vertical radiator.
  • my invention comprises one or more nearly closed ring conductive members positioned in a substantially horizontal plane, a first end of said members being electrically connected directly to a common conductive plane (real or simulated), and the second end of said members preferably connected to the common conductive plane through capacitive tuning means. Radio energy is fed into or out of the antenna through a first connection near the first end of each of said members and a second connection at said conductive plane.
  • Certain novel capacitive tuning structure is provided at the second ends.
  • the tuning capacities are of different value to achieve wideband tuning, and the feed connections near the first ends of the members are at diiferent points thereon to adjust the impedance match.
  • FIGURE 1 is a perspective view of the present antenna, showing one embodiment thereof.
  • FIGURE 2 is a longitudinal section view of a portion of FIGURE I, viewed as indicated by the broken line 22 in FIGURE 1, showing the internal structure of the tuning means.
  • FIGURE 3 is a perspective view of a portion of the antenna of FIGURE 1, showing a modified tuning means.
  • FIGURE 4 is a longitudinal section view viewed as indicated by the broken line 4-4 in FIGURE 3, showing internal details of the modified tuning means.
  • FIGURE 5 is a perspective view of a second embodiment of the invention showing a large diameter antenna mounted over a plane formed of conductive members on the earth.
  • FIGURE 6 is a perspective cut-away view showing on an enlarged scale the tuning means of FIGURE 5.
  • FIGURE 7 is a graph showing the overlapping variation of normalized input impedance versus frequency secured in the present invention.
  • FIGURE 8 is a perspective view of the present antenna, showing a system of input switching and a variable tuning ing means.
  • FIGURE 9 is a diagrammatic view showing the distribution of vertically polarized radiated power from the present antenna over the earth.
  • FIGURE 10 is a schematic diagram of the present antenna showing the voltage and current distribution thereon.
  • FIGURE 11 is a diagram illustrating a balanced version of the present antenna having two axially displaced openring members.
  • a plurality of circular, hollow conductive ring members I, 2, 3 having an overall diameter D and a respective radial spacing S are disposed in a plane parallel to and at a height H over a second plane of good electrical conductivity 4.
  • a first or near end 5 of each of said circular conductive members I, 2, and 3 is bent down to form a leg 6 conductively joining a metal plate 7 which is in turn conductively joined to the conductive plane 4 as by screws 9, the other or far ends 19 of said ring members 1, 2 and 3 being spaced from the first ends by a short gap F disposed in the plane of the ring members.
  • Two non-conductive frames 22 support and preserve the pmallel relationship of the ring members 1, 2 and 3 to the conductive plane 4.
  • the length of tuning member 24 contained within the interior of ring member 1 is designated by the dimension K.
  • the outside diameter of tuning member 24 is designated as A, and the inside diameter of the ring members is designated as B.
  • the thickness of each bead support 25 is designated as U and the spacing between these supports is designated as P.
  • That portion of the tuning members 24, 24a and 24b which emerges from the interior of the ring members 1, 2 and 3 through the non-conductive plug 26 is bent normal to the ring members and terminates conductively in common metal plate '7, and can serve as a support for this end of the antenna.
  • the interior length K of the tuning member 24 thus forms a capacitance with the tubing wall of the ring members 1, 2 and 3.
  • the dimension H does not exceed 0.l25, ⁇ it can be as low as .OOlA with an average operating value of about .007) at the middle of the actual tuning range of a particular antenna.
  • the overall diameter D of the circular conductive members is not less than 0.01M. It can be as much as .07 x without seriously disturbing the omnidirectional radiation.
  • the spacing S between the circular conductive members 1, 2 and 3 I have found not to be critical, but need only be sufficient so that conductive contact with adjacent circular members is avoided under all stresses and movements of the antenna.
  • the dimension of gap F is selected from an engineering viewpoint on the basis of two factors: (1) Mitigation of capacity efiect between the far ends ltl of the ring members and the legs 6, and (2) prevention of high-voltage discharge across this gap F.
  • the effect of the capacity at this point is to reduce or lower the high frequency end of the tuning band, while the possibilities of voltage breakdown must be considered only when large amounts of transmitted power are involved.
  • FIGURE 3 another embodiment of the tuning means is shown, and only two ring members 1 and 2 are shown for the purpose of clarity.
  • the principles to be disclosed will, however, apply to any number. It will be clear to skilled practicioners that when the height H of the antenna is much less than 0.125s, for extremely long wave-length bands, the magnitude of Z will be small. Thus, the reactive magnitude X, will also be small. Under these conditions, the length K of the tuning member 24 of FIGURE 2 may exceed the circumference of the ring member ll.
  • tuning member 24 is conductively joined at a distance K (FIG- URE- 4) to the inner conductive wall of the ring member 1 by means of a conductive disc 27 This adds inductance to the far end 10 of the antenna.
  • the non-conductive support beads 25 and the non-conductive end plug 26 are retained as in FIGURE 2.
  • the antenna may be brought resonant by terminating the external extremity of tuning member 24' in one plate of a high voltage, air insulated or vacuum insulated capacitor 29 whose reactance at A is X,.
  • the other plate of capacitor 2% is connected to conductive plane 4 through the plate 7.
  • FIGURE 5 is shown another embodiment of the invention, wherein solid conductive members such as wires or rods 31 through 36 are employed in place of the hollow tubular ring members 1, 2 and 3 of FIGURE 1.
  • solid conductive members such as wires or rods 31 through 36 are employed in place of the hollow tubular ring members 1, 2 and 3 of FIGURE 1.
  • the common conductive plane 4 is simulated by a radial configuration of conductive members in the form of soil wires 37 so disposed that the origin of the system of soil wires 37 is concentric with the origin of the plane containing the antenna wires 1-36.
  • Non-conductive poles or towers 40 are employed to support the elevated Wire members, with insulators 41 used to avoid leakage of current to the pole structures. Height H and diameter D remain as given for FIGURE 1, in terms of operating wavelength. The cross sectional diameter M of the conductors, however, is much smaller than those of FIGURE 1. I prefer that the total radio frequency loss resistance of the elevated wire members 31-36 be less than 0.03 ohms. Thus, a typical system may employ 100 lines of number eight copper cable, although only six lines are shown in the drawing to avoid complexity. For each such wire 3135, respectively, a down lead 42 is employed to conductively join each such wire member to common junction point 19 at the inner conductive member of coaxial transmission line 12 which conveys energy from the radio apparatus. End conductors 44 from wires 31-36, respectively, connect through a conductive collecting bar 45 to the conductive simulated plane 4a.
  • each pair of the elevated wire members comes to a common junction at a respective feed-through insulator 50 which passes through the walls of a weather-resistant housing 51 containing the capacitors 46-48, and three-pole switch 49.
  • the wire pair 31 and 32 tuned to frequency f by capacitor 48 causes the input impedance at the down lead junction point 19 to coaxial transmission line 12 to present a good impedance matching over a very narrow radio band centered around frequency h, as illustrated by first curve 52.
  • the band width must be considerably wider than that obtainable by this single means. Therefore, the wire pair 33 and 34 in conjunction with capacitor 47 are adjusted by means of the reactive setting of the latter to present a good impedance match to the transmission line 12 at a slightly higher frequency band centered around frequency f as illustrated by second curve 53.
  • the invention permits obtaining a total radio pass band of width xy as shown in FIGURE 7.
  • a second frequency band such as is done in using calling and working frequencies in the radio marine service.
  • placing high voltage switch 49 in the second position by means of switch control shaft .55 so that another group of three capacitor means 46a, 47a and 48a is respectively connected to wire pairs 31 and 32, 33 and 34, and 35 and 36, and suitably adjusting each of the second set of three capacitor means permits instantaneous tuning to the pass band y-z, for example, shown in FIGURE 7.
  • antenna ring members 1, 2, 3, or 3146 be disposed so as to form a circle or a polygon whose number of sides exceeds" four.
  • my disclosed elevated means may resemble the multi-turn loop antenna of the prior art.
  • currents 56 (FIGURE 10) flowing in the ring members of my invention will cause a horizontally polarized electric field component to be radiated, and they will also perceive that, due to the out-of-phase currents 57 induced in the conductive image plane 4, a second horizontally polarized field contribution will be radiated from this image source, cancelling all such horizontally polarized energy-thus seeming to render the disclosed antenna ineffective.
  • the elevated conductive members are selectively employed in this invention to form a circumferential aperture formed of the electric field lines 59 established normal to the conductive plane 4 as shown in FIGURE 10.
  • the invention establishes the equivalent of quasi-ring array of vertical electric elements 59 with a gradually increasing phase shift from one, grounded, extremity 5 of the elevated ring members 1 or 31 to the other, free, extremity 10.
  • the ring members 1-3 and their alternates 3136 form the circumferential geometry of a circle or polygon in a plane disposed parallel to conductive plane 4.
  • Those skilled in the antenna art will thus see that I deliberately employ the higher order transmis sion modes established by such three dimensional geomtry of the elevated conductive members and the conductive plane 4 for the radiative means rather than the normal TEM mode found in linear antisymmetric excita-v tion transmission line systems.
  • the invention herein disclosed does not constitute or serve as a simple elevated capacitor antenna of the prior art, for the boundary parameters of the present system force the propagation of a wave circumferentially along the perimeter of the elevated antenna and the conductive They will perceive that such propagated wave is composed of two components, one forming a standing wave system around the perimeter of the antenna and a second component of traveling wave which is present due to the radiation losses of the circumferential aperture. Also, solution of the boundary problem will disclose to skilled practitioners the fact that Poyntings vector is tangential to the circular conductive elevated members and to the image in plane 4.
  • the loading means in the form of the concentric tuning members 24, 24a, and 24b of FIGURES 1 and 2 or the capacitors 4648 of FIGURE 6 and the combination of such means 24 and 29 in FIGURES 3 and 4 are asymmetrically disposed in contrast to the symmetrical means of the prior art.
  • FIGURE 8 where an embodiment is disclosed to achieve a continuous tuning coverage means.
  • the conductive tuning member 24c is disposed as in FIGURE 4, its far extremity terminating in a variable capacitor 6!
  • the adjustment shaft 61 of such variable capacitor 6! is brought out of the capacitor housing parallel to the conductive plane 4 and is mechanically connected to the shaft of a servo motor 62.
  • a servo transmitter instrument 64 whose shaft is provided with a setting knob 65 is located at a remote operating position together with the radio apparatus 11, and connected electrically to the servo-motor 62 by an electrical cable systom 66, suitably energized by-an alternating current source means (not shown), as is well knownin the art.
  • an electrical cable systom 66 suitably energized by-an alternating current source means (not shown), as is well knownin the art.
  • transmission line 12a is provided with a coaxial switch 67 so that the transmitted energy of the radio set may be directed either to down lead 6? or 71) located at different respective distances J and I from the first or near extremity 5 of hollow ring member 1.
  • a switch control means 71 is located at the remote operating position for energizing the coaxial switch 67.
  • a reflection coellicient meter 72 is installed so that the operator may determine whenthe antenna is adjusted to a good impedance match to the line 120. I have found that for tuning to frequencies within a 2:1 ratio, a single down lead such as 69 at a position J will preserve the impedance match so as not to exceed a reflection power loss of ll percent.
  • PI"- URE 9 shows the measured distribution or the radiant energy from the present antenna invention.
  • the radiation function is that of the cosine of the elevalion angle 0, being maximum on the horizon, and is a constant in the azimuth plane 5.
  • FIGURE 10 shows the measured current and voltage distribution of the present antenna invention, as mentioned before.
  • the voltage difference E represented by the dashed electric field lines 59 between the ring members and the conductive plane 4 is a minimum magnitude at the first extremity 5 of the ring members and rises to a maximum at the second extremity 10 of said ring members.
  • the current I represented by arrows 56 in the elevated ring members is maximum in intensity at the first extremity, falling to a minimum at the second xtremity, and is 180 electrical degrees out of phase with the image current 57 induced in the conductive plane 4.
  • the antenna herein disclosed has wide application and usefulness and that considerable utility may be added by employment of the various featurm described, either singly or in combination.
  • One of the more important features of the present antenna is its low height, which as stated previously, canbe as little as .001 times the operating Wavelength.
  • An antenna comprising a nearly closed conductive ring member, a first end of said ring having a conductive extension in the form of a leg joining said first end at substantially a right angle to the plane of said ring, means for connecting the outer end of said leg to one side of a transmission line, connecting means on said ring a short distance from said first end for attaching to the other side of the transmission line, and capacitance means having one side thereof connected to the second end of said ring, and conductive means connecting the other side of said. capacitance means to said outer end of said leg.
  • said ring member is a hollow tubular structure
  • said capacitance means comprising a linear conductive tuning member supported coaxially within said second end of said ring by non-conducting means only and extending a predetermined distance within said ring, said tuning member turning substantially in the said direction as said leg just outside said second ring end and extending for substantially the same length as said leg, and conductive means connecting said leg outer end to the outer end of said tuning member.
  • said ring member is a hollow tubular structure; said capacitance means comprising a linear conductive tuning member extending coaxially within said second end of said ring for a predetermined distance, non-conductive support means between said ring second end and said tuning member, a conductive support disc connecting the inner end, only, of said tuning member to the inner diameter of said ring, said tuning member turning substantially in the same direction as said leg just outside said second ring end, and a capacitor connected at one end to the outer end of said tuning member; and including conductive means connecting said leg outer end to the other end of said capacitor.
  • Antenna structure comprising a nearly closed conductive ring member, a first end of said ring having a conductive extension in the form of a leg joining said first end at substantially a right angle to the plane of said ring, a conductive plane member attached to the outer end of said leg and lying parallel to the plane of said ring, capacitance means connected between the second end of said ring and said conductive plane member, and connecting means on said ring a short distance from said first end for attaching one conductor of a transmission line thereto.
  • said conductive plane member is at least as large as said ring member, and including a transmission line having one conductor connected to said connecting means on said ring and another conductor connected to said conductive plane member.
  • An antenna comprising a plurality of nearly closed, concentric conductive coplanar ring members positioned vnearly adjacent to each other, a first end of each said ring having a conductive extension leg joining said first end at substantially a right angle to the plane of said rings, conductive means connected between the'outer ends of said legs, a separate input lead connected at one end to each said ring a short distance from said first end,
  • each of said capacitance means has a ditferent value for tuning the antenna to an increased bandspread.
  • each of said input leads is connected to its respective ring at a difierent distance from said ring first end for correct impedance matching to a transmission line.
  • An antenna comprising a plurality of poles erected in a ring shape on the earth, a multiplicity of conductors supported parallel to the earth by said poles and insulated therefrom, said conductors being coplanar, concentric, and forming a plurality of nearly closed similar polygons having a gap at a common circumferential position, a first end of each of said conductors having a conductive leg connected thereto and extending downwardly and connected to the earth, capacitance means connected between the second ends of said conductors and the earth, an input connection on each of said conductors at a short distance from said first end, a separate down lead connected at one end to each said input connection, and the other ends of said down leads connected to each other at a common junction adapted to be connected to one side of a transmission line.
  • a system of ground conductors is provided substantially at earth level, said system comprising a plurality of radial ground conductors centered under the center of said antenna, and a plurality of bridging ground conductors connected to said radial conductors at points forming vertices of similar polygons concentric with said radial ground conductors.
  • a plurality of circular, hollow conductive ring members elevated from and disposed parallel to a substantially horizontal conductive plane, one, first extremity of each of said ring members directed substantially normal to and individually terminated conductively in said conductive plane, the opposite extremity of each said member terminating in the plane of said ring members and being isolated from said first extremity, said ring members containing internal coaxilly disposed conductive tuning members isolated therefrom, said tuning members emerging from said opposite extremities respectively and being directed normal to and terminating in said conductive plane whereby the optimum current distribution may be established, a normally disposed conductive input member connected at one end to each said ring member at a specified distance from the first extremity thereof, a coaxial transmission line having its inner conductor connected to a common junction of the other ends of said input members, said elevated plurality of ring members being supported and aligned parallel to said conductive plane by non-conductive supports.
  • An antenna system comprising a nearly closed conductive ring member, a first end of said ring having a conductive extension leg joining said first end at a right angle to the plane of said ring, means for connecting the outer end of said leg to one side of a transmission line, continuously variable capacitance means having one side thereof connected to the second end of said ring, the other side of said capacitance means conductively connected to the outer end of said leg, remote control means connected to said variable capacitance means for adjusting the capacitance thereof, a first input connection at a first point on said ring member a predetermined distance from said first ring end, a second input connection at a second point on said ring member a different predetermined distance from said first ring end, coaxial switch means having two output connections and one input connection, means connecting one of said output connections to said first ring member input connection, means connecting the second output connection to said second ring member input connection, and means for connecting said switching means input connection to the other side of the transmission line.
  • An antenna comprising a plurality of pairs of nearly closed concentric coplanar conductive ring members a first end of each said ring having a conductive extension leg joining said first end at substantially a right angle to the plane of said rings, conductive means connecting the outer ends of said legs together, a multiple pole switch having each respective pole connected to a difierent pair of said ring members at the second end thereof, a first plurality of capacitors connected at one end to one operating switch contact at each respective pole of said switch, a second plurality of capacitors connected at one end to another operating switch contact at each said switch pole, said second plurality of capacitors being of different values than said first plurality of capacitors, the other ends of all said capacitors connected to the outer ends of said legs, operating means connected to said switch for switching each pair of ring members to a difierent one of said capacitors, a separate input lead connected to each of said ring members at a predetermined respective distance from said first end thereof, said input leads being connected together at a common junction adapted to be connected with one side
  • Apparatus in accordance with claim 14 wherein said antenna is positioned parallel to a conductive plane connected conductively to said outer ends of said legs, wherein a coaxial transmission line has its inner conductor connected to the common junction of said input leads and its outer conductive sheath connected to said conductive plane.
  • An antenna comprising a pair of parallel coaxial nearly closed conductive ring members of equal diameter, conductive shorting means connected directly between respective first ends of said rings, capacitance means connected between respective second ends of said rings and a transmission line feed point on each said ring at equal distances from said first ends.

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US206248A 1962-06-29 1962-06-29 Open ring antenna Expired - Lifetime US3151328A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
NL290469D NL290469A (en, 2012) 1962-06-29
BE629886D BE629886A (en, 2012) 1962-06-29
US26196D USRE26196E (en) 1962-06-29 Open ring antenna
US206248A US3151328A (en) 1962-06-29 1962-06-29 Open ring antenna
GB7429/63A GB1018861A (en) 1962-06-29 1963-02-25 Open ring antenna
FR927246A FR1353210A (fr) 1962-06-29 1963-03-08 Antenne en anneau ouvert
DEN22885A DE1297709B (de) 1962-06-29 1963-03-14 Rundstrahlende Antenne mit einem ueber einer horizontalen leitenden Ebene angeordneten leitenden Ringgebilde
CH348463A CH417704A (de) 1962-06-29 1963-03-19 Offene Ringantenne
JP1333963A JPS3926428B1 (en, 2012) 1962-06-29 1963-03-20

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Application Number Priority Date Filing Date Title
US206248A US3151328A (en) 1962-06-29 1962-06-29 Open ring antenna

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US3151328A true US3151328A (en) 1964-09-29

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US26196D Expired USRE26196E (en) 1962-06-29 Open ring antenna
US206248A Expired - Lifetime US3151328A (en) 1962-06-29 1962-06-29 Open ring antenna

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Application Number Title Priority Date Filing Date
US26196D Expired USRE26196E (en) 1962-06-29 Open ring antenna

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US (2) US3151328A (en, 2012)
JP (1) JPS3926428B1 (en, 2012)
BE (1) BE629886A (en, 2012)
CH (1) CH417704A (en, 2012)
DE (1) DE1297709B (en, 2012)
GB (1) GB1018861A (en, 2012)
NL (1) NL290469A (en, 2012)

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US3247515A (en) * 1963-03-04 1966-04-19 Northrop Corp Low profile antenna
US3266042A (en) * 1964-04-02 1966-08-09 Seismograph Service Corp Antenna construction for mobile communication unit
US3299428A (en) * 1964-09-11 1967-01-17 Iii Lawrence P Tessari Horizontal semienclosed loop with conductive ground plane, having vertical whip extening from within loop enclosure
US3374483A (en) * 1965-05-06 1968-03-19 Coliins Radio Company Tunable electrically small antenna
US3426352A (en) * 1966-08-26 1969-02-04 Collins Radio Co Capacitively tuned reflector antenna
US3432858A (en) * 1964-12-14 1969-03-11 Allan R Brown Short dipole antenna
US4080603A (en) * 1976-07-12 1978-03-21 Howard Belmont Moody Transmitting and receiving loop antenna with reactive loading
US4169265A (en) * 1978-05-04 1979-09-25 The United States Of America As Represented By The Secretary Of The Army P-Band loop antennas in radial array
US4184164A (en) * 1977-12-27 1980-01-15 Monogram Industries, Inc. Directive loop antenna
US4516127A (en) * 1983-04-29 1985-05-07 Motorola, Inc. Three element low profile antenna
DE3823972A1 (de) * 1988-07-15 1990-01-18 Walter Dr Rer Nat Suedbeck Magnetischer strahler mit einer spule aus bifilaren windungen
US5760706A (en) * 1993-10-29 1998-06-02 Kiss; Michael Z. Remote control system using partially earth-buried RF antenna
US5940043A (en) * 1997-02-21 1999-08-17 Sensormatic Electronics Corporation Unidirectional field antenna for identification system
US6292145B1 (en) 2000-02-02 2001-09-18 Sun Yu Angled antenna for portable telephone
RU213531U1 (ru) * 2022-05-26 2022-09-15 Публичное акционерное общество "Татнефть" имени В.Д. Шашина Антенна для приема сигнала сотовой связи
CN115149251A (zh) * 2022-06-02 2022-10-04 苏州无双医疗设备有限公司 小型化植入式医疗天线和小型化植入式医疗装置

Families Citing this family (2)

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US4458248A (en) 1982-04-26 1984-07-03 Haramco Research, Inc. Parametric antenna
US5218371A (en) * 1990-08-14 1993-06-08 Sensormatic Electronics Corporation Antenna array for enhanced field falloff

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US2297427A (en) * 1939-07-12 1942-09-29 Neidhardt Peter Ultra-short wave directive antenna
US2431124A (en) * 1946-02-20 1947-11-18 Electronics Res Inc Antenna
US2578154A (en) * 1949-09-03 1951-12-11 Collins Radio Co Radiant energy antenna

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DE710360C (de) * 1936-05-19 1941-09-11 Rca Corp Antennenanordnung
US2478700A (en) * 1944-11-11 1949-08-09 Rca Corp Traveling wave antenna
US2447879A (en) * 1945-11-19 1948-08-24 Gen Electric Antenna
US2501778A (en) * 1946-10-10 1950-03-28 Rca Corp Broadcast antenna

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2297427A (en) * 1939-07-12 1942-09-29 Neidhardt Peter Ultra-short wave directive antenna
US2431124A (en) * 1946-02-20 1947-11-18 Electronics Res Inc Antenna
US2578154A (en) * 1949-09-03 1951-12-11 Collins Radio Co Radiant energy antenna

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3247515A (en) * 1963-03-04 1966-04-19 Northrop Corp Low profile antenna
US3266042A (en) * 1964-04-02 1966-08-09 Seismograph Service Corp Antenna construction for mobile communication unit
US3299428A (en) * 1964-09-11 1967-01-17 Iii Lawrence P Tessari Horizontal semienclosed loop with conductive ground plane, having vertical whip extening from within loop enclosure
US3432858A (en) * 1964-12-14 1969-03-11 Allan R Brown Short dipole antenna
US3374483A (en) * 1965-05-06 1968-03-19 Coliins Radio Company Tunable electrically small antenna
US3426352A (en) * 1966-08-26 1969-02-04 Collins Radio Co Capacitively tuned reflector antenna
US4080603A (en) * 1976-07-12 1978-03-21 Howard Belmont Moody Transmitting and receiving loop antenna with reactive loading
US4184164A (en) * 1977-12-27 1980-01-15 Monogram Industries, Inc. Directive loop antenna
US4169265A (en) * 1978-05-04 1979-09-25 The United States Of America As Represented By The Secretary Of The Army P-Band loop antennas in radial array
US4516127A (en) * 1983-04-29 1985-05-07 Motorola, Inc. Three element low profile antenna
DE3823972A1 (de) * 1988-07-15 1990-01-18 Walter Dr Rer Nat Suedbeck Magnetischer strahler mit einer spule aus bifilaren windungen
US5760706A (en) * 1993-10-29 1998-06-02 Kiss; Michael Z. Remote control system using partially earth-buried RF antenna
US5940043A (en) * 1997-02-21 1999-08-17 Sensormatic Electronics Corporation Unidirectional field antenna for identification system
US6292145B1 (en) 2000-02-02 2001-09-18 Sun Yu Angled antenna for portable telephone
RU213531U1 (ru) * 2022-05-26 2022-09-15 Публичное акционерное общество "Татнефть" имени В.Д. Шашина Антенна для приема сигнала сотовой связи
CN115149251A (zh) * 2022-06-02 2022-10-04 苏州无双医疗设备有限公司 小型化植入式医疗天线和小型化植入式医疗装置

Also Published As

Publication number Publication date
USRE26196E (en) 1967-04-25
GB1018861A (en) 1966-02-02
BE629886A (en, 2012)
NL290469A (en, 2012)
CH417704A (de) 1966-07-31
JPS3926428B1 (en, 2012) 1964-11-20
DE1297709B (de) 1969-06-19

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