US3725943A - Turnstile antenna - Google Patents

Turnstile antenna Download PDF

Info

Publication number
US3725943A
US3725943A US3725943DA US3725943A US 3725943 A US3725943 A US 3725943A US 3725943D A US3725943D A US 3725943DA US 3725943 A US3725943 A US 3725943A
Authority
US
Grant status
Grant
Patent type
Prior art keywords
coaxial
lines
port
antenna
polarized
Prior art date
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
Application number
Inventor
W Spanos
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ITT Corp
Original Assignee
ITT Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Grant date

Links

Images

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q25/00Antennas or antenna systems providing at least two radiating patterns
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S1/00Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00Antenna arrays or systems
    • H01Q21/24Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
    • H01Q21/26Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre

Abstract

A multimode turnstile antenna providing simultaneously, without interference, right and left hand circularly polarized omnidirectional patterns and a vertically polarized omnidirectional pattern. Four coaxial cables are disposed vertically and parallel to each other. A frusto-conical member has its smaller diameter end disposed adjacent the upper ends of the coaxial cables to electrically and physically interconnect the outer conductors of all the coaxial cables. This arrangement, when the two pairs of diagonally disposed coaxial cables are excited in a balanced relationship and the pairs are excited orthogonally by first energy, provides simultaneously both right and left hand circularly polarized omnidirectional patterns. When four members are disposed adjacent the upper half of the coaxial line with each of these members being coupled to the center conductor of a different one of the coaxial lines and extending outwardly at an angle (preferably 90*) with respect to the associated one of the coaxial lines with the members orthogonally related with respect to each other, the antenna, in addition, simultaneously provides, when each of the four coaxial lines are excited inphase by second energy, a vertically polarized omnidirectional pattern. An embodiment of a feed arrangement is disclosed enabling the four coaxial lines to be excited inphase by the second energy and simultaneously to enable each of the four coaxial lines to be excited by the different orthogonally related first energy.

Description

tes at Elite St Spanos Apr. 3, 1973 [54] TURNSTILE ANTENNA [75] Inventor: William M. Spanos, Wayne, NJ.

[73] Assignee: International Telephone and Telegraph Corporation, Nutley, NJ.

[22] Filed: Oct. 12, 1970 [21] Appl. No.: 79,964

[52] US. Cl ..343/797, 343/846 [51] Int. Cl. .343 854, l-10lq 21/26 [58] Field of Search ..343/773, 798, 846, 797, 854

[56] References Cited UNITED STATES PATENTS 2,432,858 12/1947 Brown ..343/797 3,262,121 7/1966 Holloway .....343/773 3,295,134 12/1916 Lowe ..343/854 3,579,244 5/1971 Dempsey et al ..343/797 Primary ExaminerEli Lieberman Attorney-C. Cornell Remsen, Jr., Walter .l.- Baum, Paul W. Hemminger, Charles L. Johnson, Jr., Philip M. Bolton, Isidore Togut, Edward Goldberg and Menotti J. Lombardi, Jr.

57 ABSTRACT A multimode turnstile antenna providing simultaneously, without interference, right and left hand circularly polarized omnidirectional patterns and a vertically polarized omnidirectional pattern. Four coaxial cables are disposed vertically and parallel to each other. A frusto-conical member has its smaller diameter end disposed adjacent the upper ends of the coaxial cables to electrically and physically interconnect the outer conductors of all the coaxial cables. This arrangement, when the two pairs of diagonally disposed coaxial cables are excited in a balanced relationship and the pairs are excited orthogonally by first energy, provides simultaneously both right and left hand circularly polarized omnidirectional patterns. When four members are disposed adjacent the upper half of the coaxial line with each of these members being coupled to the center conductor of a different one of the coaxial lines and extending outwardly at an angle (preferably 90) with respect to the associated one of the coaxial lines with the members orthogonally related with respect to each other, the antenna, in addition, simultaneously provides, when each of the four coaxial lines are excited inphase by second energy, a vertically polarized omnidirectional pattern. An embodiment of a feed arrangement is disclosed enabling the four coaxial lines to beexcited inphase by the second energy and simultaneously to enable each of the four coaxial lines to be excited by the different orthogonally related first energy. 1

' 7 Claims, 5 Drawing Figures LANCQD HYBRID OHM/DIRK r/ONAL FOR T INPNA S 5 INPHA 55 5 FOR T J POR 7' Cl CULARL Y POLARIZED OMN/D/RECI'IMAL PORT 1i SE ANTENNA BACKGROUND OF THE INVENTION This invention relates to antennas and more particularly to turnstile antennas.

Because of existant space limitations and a need for greater numbers of antennas to provide radiating means for a multiplicity of services, the trend in antenna design is toward compact multipurpose radiators which provide more than one function. For example, in mobile applications, requirements exist for providing radio communications and navigation functions simul- SUMMARY OF THE INVENTION An object of the present invention is to provide a multimode antenna suitable for utilization in satellite systems. 7

Another object of the present invention is to provide a multimode turnstile antenna capable of having simultaneously a vertically polarized omnidirectional pattern, a right hand circularly polarized omnidirectional pattern and a left hand circularly polarized omnidirectional'pattern.

Still another object of the present invention is to provide a multimode turnstile antenna capable of utilization with satellite systems, LOS communication systems and/or navigation systems.

A feature of the present invention is the provision of a multimode turnstile antenna capable of having simultaneously a vertically polarized omnidirectional pattern, a right hand circularly polarized omnidirectional pattern and a left hand circularly polarized omnidirectional pattern comprising four coaxial transmission lines disposed in a vertical, parallel relationship, each of the coaxial lines including an inner conductor and an outer conductor; and a frusto-conical member having its smaller diameter end disposed adjacent the upper end of the coaxial lines to electrically and physically interconnect the outer conductors of all the coaxial lines.

Another feature of the present invention is the provision of four members disposed adjacent the upper end of the coaxial lines, each of the members being coupled to the center conductor of a different one of the coaxial lines and extending-outwardly at an angle with respect to the associated one of the coaxial lines.

A further feature of the present invention is the provision of a multimode turnstile antenna as described above wherein each of the four coaxial lines are excited by inphase energy and simultaneously each of the coaxial lines are excited by different orthogonally related energy.

BRIEF DESO I 1 ON OF THE DRAWING The above-mentioned and other features and objects of this invention will become more apparent by reference to the following description taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a perspective view of a multimode turnstile antenna and its feed arrangement in accordance with the principles of the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is the elevational pattern for left hand circular polarization resulting from the antenna of FIG. 1;

FIG. 4 is the elevational pattern for right hand circular polarization resulting from the antenna of FIG. 1; v

and

FIG. 5 illustrates the figure 8 elevational pattern for vertical polarization resulting from the antenna of FIG. 1.

DESCRIPTION OF THE PREFERRED EIVIBODIMENT For purposes of explanation, let us consider a UHF (ultra-high frequency) line-of-sight (LOS) ground-toground communication, UHF satellite communications and L-band DME (distance measuring equipment)/l"acan or' RSB (Radar Safety Beacon)/IFF (Identification Friend or Foe) applications wherein the following requirements would exist for an antenna at a user terminal.

Function Polarization Frequency Band Pattern Coverage UHF LOS Vertical 225-400 MHZ Figure 8 in Communications elevation, omnidirectional UHF 7 Satellite Dual Circular 225-400 MHZ Hemispherical Communication DME/Tacan Vertical 960-1215 MHZ Figure 8 in RSB/[FF elevation, omnidirectional The term dual circular as presented in the above table refers to right and left hand circularly polarized radiation. The term hemispherical present in the above table has reference to a right and left hand circularly polarized omnidirectional pattern.

Referring to FIGS. 1 and 2, there is illustrated therein a multimode turnstile antenna in accordance with the principles of the present invention including four coaxial transmission lines 1-4, each of which includes an outer conductor 5 and winner conductor 6. The outer conductor 5 of coaxial lines 1-4 are interconnected electrically and physically by frust-conical member 7 which has its smaller diameter end 8 physically and electrically interconnecting the outer conductors of coaxial transmission lines 1-4. The length of the side of member 7 is greater than one quarter wavelength at the operating frequency. To inner conductors 6 at the upper end thereof are connected members 9, 10, 11 and 12 to form a turnstile antenna. Members 9-12 are disposed at an angle, preferably with respect to coaxial transmission lines 1-4 and extend outwardly from the center conductors 6 thereof in such a manner as to dispose elements 9-12 in an orthogonal relationship with respect to each other.

The structure including members 9-12 and frustconical member '7 (member 7 acting as a reflecting element) provides a hemispherical antenna pattern when each of the pairs of coaxial lines l and 4 and coaxial lines 2 and 3 are excited in a balanced relationship and these pairs of coaxial lines are orthogonally excited by a given energy for transmission from the antenna structure, or when hemispherically radiated energy is received by member 7 in conjunction with members 9-12. The frusto-conical member 7 and members 9-12 due to their hemispherical antenna pattern provides the multifunction of providing both right and left hand circular polarization with an omnidirectional pattern. This arrangement would be suitable for UHF satellite communication as indicated in the above table.

To provide vertical polarization for UHF LOS communications or DME/Tacan, RSB/IFF applications, members 9-12 together with member 7 (member 7 acting as a radiating element) are employed. Each of members 9-12 having a length equal to approximately 0.35D at the operating frequency of the antenna, where D is equal to the diameter of the base of the frustoconical member 7 as shown in FIG. 2. The length of the side and the diameter D of the base of member 7 and the length of members 9-12 controls the radiation patterns generated by the antenna of this invention. To provide the desired transmission of vertically polarized omnidirectional energy, coaxial lines 1-4 must be energized by the desired energy inphase or upon reception of vertically omnidirectional energy, coaxial lines 1-4 will be excited inphase by the received energy.

FIG. 3 illustrates the elevational hemispherical pattern produced by the left hand circularly polarized excitation of members 9-12 and member 7, FIG. 4 illustrates the hemispherical elevation pattern provided by right hand polarization excitation of members 9-12 and member 7 and FIG. illustrates the figure 8 elevational pattern produced by the vertically polarized excitation of members 9-12 and member 7.

polarization is applied to port 17 and fed through power divider 16 to the inphase ports of balanced hybrids l3 and 14. This results in an inphase excitation of coaxial lines 1-4 as indicated by the symbol applied to the ports of hybrids 13 and 14 connected to the center conductors of coaxial lines l-4. This inphase excitation of the coaxial lines 1-4 will result in the figure 8 elevational antenna pattern shown in FIG. 5 due to members 9-12 and member 7.

The circular polarization pattern for transmission is simultaneously provided by excited port 18 of quadrature hybrid '15 with left hand circularly polarized signal and port 19 of quadrature hybrid with right hand circularly polarized signal. This results in a 0 phase shift for left hand circularly polarized signals (a 90 phase shift for right hand circularly polarized signals) at port 20 of hybrid 15 which is coupled to the balanced port of hybrid -13. Hybrid 13 produces a 0 phase shift for left hand circularly polarized signals (a +90 phase shift for right hand circularly polarized signal) for excitation of transmission line 4 and a 180 phase shift for left hand circularly polarized signal a phase shift for right hand circularly polarized signal) for excitation of transmission line 1. Simultaneously, the energy applied to ports 18 and 19 is coupled from port 21 of hybrid 15 to the balanced port of hybrid 14 resulting in a +90 phase shift for left hand circularly polarized signal (a 0 phase shift for right hand circularly polarized signals) for excitation of transmission line 3 and a -90 phase shift for left hand circularly polarized signal (a phase shift for right hand circularly polarized signal) for excitation of transmission line 2. The resultant excitation of coaxial lines 1-4 with different balanced and orthogonal energy results in a circularly polarized signal radiated from the antenna structure including members 9-12 and member 7.

When the antenna structure of FIG. 1 is employed for receiving left and right hand circularly polarized energy, members 9-12 and member 7 cause coaxial lines 1 and 4 and coaxial lines 2 and 3 to be excited in a balanced relation with these pairs of coaxial lines being excited in phase quadrature. This results in the ports of hybrids 13 and 14 being excited as follows: 0 (+90) from line 4, 180 (90) from line 1, +90 (0) from line 3 and 90 (180) from line 2. There then will result at ports 18 and 19 output signals resulting from received left hand and right hand circularly polarized signals. When the antenna structure including members 9-12 and member 7 receive vertically polarized omnidirectional radiation, coaxial transmission lines 1-4 are excited by inphase received energy as indicated by the symbol applied to the ports of hybrids 13 and 14. The output from the inphase ports of hybrids 13 and 14 are coupled to port 17 through power adder 16.

While I have described above the principles of my invention in connection with specific apparatus, it is to be clearly understood that this description is made only by way of example and not as a limitation to the scope of my invention as set forth in the objects thereof and in the accompanying claims.

I claim:

1. A multimode turnstile antenna capable of having simultaneously a vertically polarized omnidirectional pattern, a right hand circularly polarized omnidirectional pattern and a left hand circularly polarized omnidirectional pattern comprising:

four coaxial transmission lines disposed in a vertical parallel relationship, each of said coaxial lines including an inner conductor and an outer conductor;

a frusto-conical member having its smaller diameter end disposed adjacent the upper end of said coaxial lines to electrically and physically interconnect said outer conductors of all said coaxial lines; and

four members disposed adjacent'said upper end of said coaxial lines, each of said members being coupled to said center conductor of a different one of said coaxial lines and extending outwardly at an angle with respect to the associated one of said coaxial lines. 7

2. An antenna according to claim 1, wherein said members are orthogonally related with respect to each other.

3. An antenna according to claim 2, wherein each of said coaxial lines are excited by inphase energy and simultaneously each of said coaxial lines are excited by different orthogonally related enery- 4. An antenna according to claim 2, wherein each of said members have a length equal to approximately one quarter wavelength at the operating frequency of said antenna.

5. An antenna according to claim 2, wherein the side of said frusto-conical member has a length greater than one quarter wavelength at the operating frequency of said antenna.

6. An antenna according to claim 2, further including a first balanced hybrid having a first balanced port, a first inphase port, a first port coupled to said center conductor of a first of said coaxial lines and a second port coupled to said center conductor of a second of said coaxial lines diagonally disposed with respect to said first of said coaxial lines, said first port being responsive to first energy, said second port being responsive to said first energy having a 180 phase relationship with said first energy at said first port and said first and second ports simultaneously being responsive to inphase second energy;

a second balanced hybrid having a second balanced port, a second inphase port, a third port coupled to said center conductor of a third of said coaxial lines and a fourth port coupled to said center conductor of a fourth of said coaxial lines diagonally disposed with respect to said third of said coaxial lines, said third port being responsive to said first energy having a phase relationship with said first energy at said first port, said fourth port being responsive to said first energy having a +90 phase relationship with said first energy at said first port and said third and fourth ports simultaneously being responsive to said inphase second energy;

third means connected in common to said first and second inphase ports; and

a quadrature hybrid having a fifth port, a sixth port, a 0 phase port coupled to said first balanced port and a 90 phase port coupled to said second balanced port.

7. An antenna according to claim 6, wherein said third means includes a power divider.

Claims (7)

1. A multimode turnstile antenna capable of having simultaneously a vertically polarized omnidirectional pattern, a right hand circularly polarized omnidirectional pattern and a left hand circularly polarized omnidirectional pattern comprising: four coaxial transmission lines disposed in a vertical parallel relationship, each of said coaxial lines including an inner conductor and an outer conductor; a frusto-conical member having its smaller diameter end disposed adjacent the upper end of said coaxial lines to electrically and physically interconnect said outer conductors of all said coaxial lines; and four members disposed adjacent said upper end of said coaxial lines, each of said members being coupled to said center conductor of a different one of said coaxial lines and extending outwardly at an angle with respect to the associated one of said coaxial lines.
2. An antenna according to claim 1, wherein said members are orthogonally related with respect to each other.
3. An antenna according to claim 2, wherein each of said coaxial lines are excited by inphase energy and simultaneously each of said coaxial lines are excited by different orthogonally related energy.
4. An antenna according to claim 2, wherein each of said members have a length equal to approximately one quarter wavelength at the operating frequency of said antenna.
5. An antenna according to claim 2, wherein the side of said frusto-conical member has a length greater than one quarter wavelength at the operating frequency of said antenna.
6. An antenna according to claim 2, further including a first balanced hybrid having a first balanced port, a first inphase port, a first port coupled to said center conductor of A first of said coaxial lines and a second port coupled to said center conductor of a second of said coaxial lines diagonally disposed with respect to said first of said coaxial lines, said first port being responsive to first energy, said second port being responsive to said first energy having a 180* phase relationship with said first energy at said first port and said first and second ports simultaneously being responsive to inphase second energy; a second balanced hybrid having a second balanced port, a second inphase port, a third port coupled to said center conductor of a third of said coaxial lines and a fourth port coupled to said center conductor of a fourth of said coaxial lines diagonally disposed with respect to said third of said coaxial lines, said third port being responsive to said first energy having a -90* phase relationship with said first energy at said first port, said fourth port being responsive to said first energy having a +90* phase relationship with said first energy at said first port and said third and fourth ports simultaneously being responsive to said inphase second energy; third means connected in common to said first and second inphase ports; and a quadrature hybrid having a fifth port, a sixth port, a 0* phase port coupled to said first balanced port and a 90* phase port coupled to said second balanced port.
7. An antenna according to claim 6, wherein said third means includes a power divider.
US3725943A 1970-10-12 1970-10-12 Turnstile antenna Expired - Lifetime US3725943A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US7996470 true 1970-10-12 1970-10-12

Publications (1)

Publication Number Publication Date
US3725943A true US3725943A (en) 1973-04-03

Family

ID=22153939

Family Applications (1)

Application Number Title Priority Date Filing Date
US3725943A Expired - Lifetime US3725943A (en) 1970-10-12 1970-10-12 Turnstile antenna

Country Status (2)

Country Link
US (1) US3725943A (en)
DE (1) DE2150660A1 (en)

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906514A (en) * 1971-10-27 1975-09-16 Harris Intertype Corp Dual polarization spiral antenna
US3919710A (en) * 1974-11-27 1975-11-11 Nasa Turnstile and flared cone UHF antenna
US4012742A (en) * 1975-12-29 1977-03-15 International Telephone And Telegraph Corporation Multimode loop antenna
US4031539A (en) * 1975-12-11 1977-06-21 Rca Corporation Broadband turnstile antenna
US4088970A (en) * 1976-02-26 1978-05-09 Raytheon Company Phase shifter and polarization switch
US4198641A (en) * 1976-08-09 1980-04-15 Rca Corporation Rotating field polarization antenna system
US4317122A (en) * 1980-08-18 1982-02-23 Rca Corporation Duopyramid circularly polarized broadcast antenna
US4446465A (en) * 1978-11-02 1984-05-01 Harris Corporation Low windload circularly polarized antenna
FR2552274A1 (en) * 1983-09-16 1985-03-22 Int Standard Electric Corp Phase shifting network for directional antenna system
FR2576152A1 (en) * 1985-01-14 1986-07-18 Applic Rech Electronique Multiport omnidirectional VHF antenna
EP0251818A2 (en) * 1986-07-04 1988-01-07 Nec Corporation Omnidirectional antenna assembly
US4737793A (en) * 1983-10-28 1988-04-12 Ball Corporation Radio frequency antenna with controllably variable dual orthogonal polarization
US5172128A (en) * 1989-11-24 1992-12-15 Thomson-Csf Antenna with circular polarization, notably for antenna array
US5434575A (en) * 1994-01-28 1995-07-18 California Microwave, Inc. Phased array antenna system using polarization phase shifting
US5489909A (en) * 1991-06-14 1996-02-06 Diehl Gmbh & Co. Sensor arrangement, especially for a landmine
US5504493A (en) * 1994-01-31 1996-04-02 Globalstar L.P. Active transmit phased array antenna with amplitude taper
US5523767A (en) * 1993-02-17 1996-06-04 The United States Of America As Represented By The Secretary Of The Army Wideband dual-polarized tilted dipole antenna
US5982326A (en) * 1997-07-21 1999-11-09 Chow; Yung Leonard Active micropatch antenna device and array system
US6356242B1 (en) * 2000-01-27 2002-03-12 George Ploussios Crossed bent monopole doublets
US6580398B2 (en) * 2001-10-25 2003-06-17 Star H Corporation Low profile antenna
US20100277389A1 (en) * 2009-05-01 2010-11-04 Applied Wireless Identification Group, Inc. Compact circular polarized antenna
US20110025569A1 (en) * 2009-08-03 2011-02-03 Venti Group, LLC Cross-dipole antenna combination
US20110025573A1 (en) * 2009-08-03 2011-02-03 William Ernest Payne Cross-dipole antenna
US20110068992A1 (en) * 2009-08-03 2011-03-24 Venti Group, LLC Cross-dipole antenna configurations
US8618998B2 (en) 2009-07-21 2013-12-31 Applied Wireless Identifications Group, Inc. Compact circular polarized antenna with cavity for additional devices
US8624791B2 (en) 2012-03-22 2014-01-07 Venti Group, LLC Chokes for electrical cables
US8803755B2 (en) 2013-01-10 2014-08-12 Venti Group, LLC Low passive intermodulation chokes for electrical cables
US8803749B2 (en) 2011-03-25 2014-08-12 Kwok Wa Leung Elliptically or circularly polarized dielectric block antenna

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4074268A (en) * 1976-06-21 1978-02-14 Hoffman Electronics Corporation Electronically scanned antenna
DE19823750A1 (en) 1998-05-27 1999-12-09 Kathrein Werke Kg Antenna array with a plurality of vertically superposed primary radiator modules

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432858A (en) * 1943-03-31 1947-12-16 Rca Corp Antenna system
US3262121A (en) * 1963-05-06 1966-07-19 Collins Radio Co Antenna feed point crossover
US3295134A (en) * 1965-11-12 1966-12-27 Sanders Associates Inc Antenna system for radiating directional patterns
US3579244A (en) * 1968-08-27 1971-05-18 Itt Collapsible antenna employing flexible tape radiators

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432858A (en) * 1943-03-31 1947-12-16 Rca Corp Antenna system
US3262121A (en) * 1963-05-06 1966-07-19 Collins Radio Co Antenna feed point crossover
US3295134A (en) * 1965-11-12 1966-12-27 Sanders Associates Inc Antenna system for radiating directional patterns
US3579244A (en) * 1968-08-27 1971-05-18 Itt Collapsible antenna employing flexible tape radiators

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906514A (en) * 1971-10-27 1975-09-16 Harris Intertype Corp Dual polarization spiral antenna
US3919710A (en) * 1974-11-27 1975-11-11 Nasa Turnstile and flared cone UHF antenna
US4031539A (en) * 1975-12-11 1977-06-21 Rca Corporation Broadband turnstile antenna
US4012742A (en) * 1975-12-29 1977-03-15 International Telephone And Telegraph Corporation Multimode loop antenna
US4088970A (en) * 1976-02-26 1978-05-09 Raytheon Company Phase shifter and polarization switch
US4198641A (en) * 1976-08-09 1980-04-15 Rca Corporation Rotating field polarization antenna system
US4446465A (en) * 1978-11-02 1984-05-01 Harris Corporation Low windload circularly polarized antenna
US4317122A (en) * 1980-08-18 1982-02-23 Rca Corporation Duopyramid circularly polarized broadcast antenna
FR2552274A1 (en) * 1983-09-16 1985-03-22 Int Standard Electric Corp Phase shifting network for directional antenna system
US4737793A (en) * 1983-10-28 1988-04-12 Ball Corporation Radio frequency antenna with controllably variable dual orthogonal polarization
FR2576152A1 (en) * 1985-01-14 1986-07-18 Applic Rech Electronique Multiport omnidirectional VHF antenna
EP0251818A2 (en) * 1986-07-04 1988-01-07 Nec Corporation Omnidirectional antenna assembly
EP0251818A3 (en) * 1986-07-04 1990-03-14 Nec Corporation Omnidirectional antenna assembly
US5172128A (en) * 1989-11-24 1992-12-15 Thomson-Csf Antenna with circular polarization, notably for antenna array
US5489909A (en) * 1991-06-14 1996-02-06 Diehl Gmbh & Co. Sensor arrangement, especially for a landmine
US5523767A (en) * 1993-02-17 1996-06-04 The United States Of America As Represented By The Secretary Of The Army Wideband dual-polarized tilted dipole antenna
US5434575A (en) * 1994-01-28 1995-07-18 California Microwave, Inc. Phased array antenna system using polarization phase shifting
US5504493A (en) * 1994-01-31 1996-04-02 Globalstar L.P. Active transmit phased array antenna with amplitude taper
US5982326A (en) * 1997-07-21 1999-11-09 Chow; Yung Leonard Active micropatch antenna device and array system
US6356242B1 (en) * 2000-01-27 2002-03-12 George Ploussios Crossed bent monopole doublets
US6580398B2 (en) * 2001-10-25 2003-06-17 Star H Corporation Low profile antenna
US8106846B2 (en) 2009-05-01 2012-01-31 Applied Wireless Identifications Group, Inc. Compact circular polarized antenna
US20100277389A1 (en) * 2009-05-01 2010-11-04 Applied Wireless Identification Group, Inc. Compact circular polarized antenna
US8618998B2 (en) 2009-07-21 2013-12-31 Applied Wireless Identifications Group, Inc. Compact circular polarized antenna with cavity for additional devices
US8325101B2 (en) 2009-08-03 2012-12-04 Venti Group, LLC Cross-dipole antenna configurations
US20110068992A1 (en) * 2009-08-03 2011-03-24 Venti Group, LLC Cross-dipole antenna configurations
CN102484320A (en) * 2009-08-03 2012-05-30 温提集团有限责任公司 Cross-dipole Antenna
US8289218B2 (en) 2009-08-03 2012-10-16 Venti Group, LLC Cross-dipole antenna combination
US20110025573A1 (en) * 2009-08-03 2011-02-03 William Ernest Payne Cross-dipole antenna
US8427385B2 (en) 2009-08-03 2013-04-23 Venti Group, LLC Cross-dipole antenna
US20110025569A1 (en) * 2009-08-03 2011-02-03 Venti Group, LLC Cross-dipole antenna combination
CN102484320B (en) 2009-08-03 2014-10-08 温提集团有限责任公司 Cross-dipole antenna
US8638270B2 (en) 2009-08-03 2014-01-28 Venti Group, LLC Cross-dipole antenna configurations
US9710576B2 (en) 2009-08-03 2017-07-18 Venti Group, LLC Cross-dipole antenna configurations
US8803749B2 (en) 2011-03-25 2014-08-12 Kwok Wa Leung Elliptically or circularly polarized dielectric block antenna
US8624791B2 (en) 2012-03-22 2014-01-07 Venti Group, LLC Chokes for electrical cables
US8803755B2 (en) 2013-01-10 2014-08-12 Venti Group, LLC Low passive intermodulation chokes for electrical cables

Also Published As

Publication number Publication date Type
DE2150660A1 (en) 1972-04-13 application

Similar Documents

Publication Publication Date Title
US3646559A (en) Phase and frequency scanned antenna
US3568204A (en) Multimode antenna feed system having a plurality of tracking elements mounted symmetrically about the inner walls and at the aperture end of a scalar horn
US3340531A (en) Satellite communication system
US3521284A (en) Antenna with pattern directivity control
US3373433A (en) Dual linear/circular polarization spiral antenna
US3295134A (en) Antenna system for radiating directional patterns
Vaughan Switched parasitic elements for antenna diversity
Rudge The handbook of antenna design
Mailloux et al. Microstrip array technology
US6501965B1 (en) Radio communication base station antenna
US3623111A (en) Multiaperture radiating array antenna
US4446465A (en) Low windload circularly polarized antenna
US5173711A (en) Microstrip antenna for two-frequency separate-feeding type for circularly polarized waves
US6016127A (en) Traveling wave antenna
Lipsky Microwave passive direction finding
US5216430A (en) Low impedance printed circuit radiating element
US3829863A (en) Polarizing feed apparatus for biconical antennas
US6037905A (en) Azimuth steerable antenna
US5767807A (en) Communication system and methods utilizing a reactively controlled directive array
US3818490A (en) Dual frequency array
US6133891A (en) Quadrifilar helix antenna
US4742354A (en) Radar transceiver employing circularly polarized waveforms
US3803618A (en) Multimodal retrodirective array
US5243358A (en) Directional scanning circular phased array antenna
US4051474A (en) Interference rejection antenna system

Legal Events

Date Code Title Description
AS Assignment

Owner name: ITT CORPORATION

Free format text: CHANGE OF NAME;ASSIGNOR:INTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION;REEL/FRAME:004389/0606

Effective date: 19831122