WO1991011038A1 - Four-wire fractional winding helical antenna and manufacturing method thereof - Google Patents
Four-wire fractional winding helical antenna and manufacturing method thereof Download PDFInfo
- Publication number
- WO1991011038A1 WO1991011038A1 PCT/JP1990/001650 JP9001650W WO9111038A1 WO 1991011038 A1 WO1991011038 A1 WO 1991011038A1 JP 9001650 W JP9001650 W JP 9001650W WO 9111038 A1 WO9111038 A1 WO 9111038A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- antenna
- segment
- helical antenna
- cylinders
- antenna element
- 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.)
- Ceased
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
- H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
- H01Q11/08—Helical antennas
Definitions
- the present invention relates to a four-wire fractional-turn helical antenna and a method for manufacturing the same, which enable a spiral conductor pattern to be accurately and easily manufactured by a photoetching technique on a cylindrical or multi-stage cylindrical base.
- the present invention relates to a four-wire fractional-turn helical antenna device that can prevent a decrease in gain and a decrease in directivity due to the influence of a reflected wave from a metal base or the like that supports a fractional-turn helical antenna element.
- FIG. 11 is a cross-sectional view showing an example of a conventional four-segment winding helical antenna used in such a system.
- the four-segment helical antenna shown in this figure is arranged in a radome 102 mounted on the base 101, and a balun 103 mounted on the base 101 and a balun 10 And a hybrid circuit (HYB) JL05 provided below the base 101 and connected to the balun 03.
- a hybrid circuit (HYB) JL05 provided below the base 101 and connected to the balun 03.
- the antenna body has a mylar member 106 formed in a columnar shape as shown in FIG. 12 and two antenna elements 107, which are wound around the outer periphery of the mylar member 106 in a very spiral shape. 08, the lower ends of these antenna elements 107 and 108 are connected to the four terminals of the paran 103, respectively. ing.
- the paran 103 is a portion for adjusting the balance or unbalance between the hybrid circuit 105 and each of the antenna elements 1.07 and 108.
- the lower end of the paran 103 is formed by the same cable or the like penetrating the base 101. Connected to 5.
- the hybrid path 105 derives two signals whose phases are shifted from each other by a predetermined angle with respect to signals input and output from a transceiver arranged in the aircraft and supplies the signals to the balun 103. And a process of synthesizing the two received signals output via the paraner 03 and supplying the synthesized signal to the transceiver.
- the above-mentioned cylindrical four-segment helical antenna has a relatively narrow applicable frequency range, as shown in Figs. 13 (b) and (c), and is used for simultaneous transmission and reception using the same antenna.
- Figures 13 (a), (fa), and (c) show the specific dimensions of the conventional single-cylinder four-segment helical antenna and the standing wave ratio as seen from the two input ends of the paran, respectively. (This is the result of measuring SWFU.
- the dimensions of the mylar part are determined as shown in the same figure), and the antenna pattern (conductor pattern on the peripheral surface of the mylar part) is used so that 1.53 GHz-: L, 56 GHz and 1.63 GHz-: I, 66 GHz can be used. ) Is formed.
- the SWRs seen from each of the two input terminals of the balun should have the same characteristics, but generally differ somewhat due to manufacturing errors and uneven quality.
- the overall characteristics of the antenna are greatly affected by the above SWP, The practical SWR limit is generally 1.5 (or less).
- such a pattern forming method is a complicated operation in which the skill of the operator directly affects the dimensional accuracy of the antenna body 104, so that it is not suitable for mass production. It is difficult to make the dimensional accuracy uniform. As a result, the yield of the product is poor, and further, the appearance is deteriorated and the product value is lowered, and the like.
- an antenna with a four-segment wound antenna pattern formed on the peripheral surface of a plastic It is difficult.
- a first object of the present invention is to improve the characteristics of the conventional four-segment spiral helical antenna, in particular, to increase the applicable frequency and to eliminate the drawbacks in manufacturing the spirally drawn conductor pattern. And a variety of antenna shapes.-A four-segment winding that makes it possible to accurately and easily manufacture a spiral conductor pattern on a cylindrical or multi-stage cylindrical base by photo-etching technology. It is intended to provide a helical antenna and a method for manufacturing the helical antenna.
- the vertical gain of the radiation pattern decreases as shown in Fig. I5.
- the gain changes with the change in direction.
- the maximum value of the gain for the direction is indicated by the outer line
- the maximum value of the gain is indicated by the inner line. Indicated by the line.
- the variation between the inner radiation pattern P 1 which is the line connecting the minimum value and the outer radiation pattern P 2 which is the line connecting the maximum value of the gain in each direction is' It is getting bigger and the overall antenna gain is getting smaller.
- the cause of the characteristic deterioration is considered to be that a part of the radio wave radiated by the antenna body i04 is reflected by the metal base 101 and the airframe 100 as shown in FIG.
- radio waves from the antenna element enter the hybrid circuit or balun, these circuits may not function properly.As a result, the SWR and antenna efficiency may be reduced, and the directional characteristics may be degraded. Will come.
- the second object of the present invention is to provide an antenna Prevents radio waves from the body from being reflected by the antenna base or the body, which makes the radiation pattern more nearly ideal ⁇ -shape and prevents lowering of the directivity characteristics. It is to provide an antenna device.
- a four-segment-winding helical antenna comprises a plurality of cylinders or cylinders having different diameters connected in multiple stages with the same axis.
- a conductor pattern is formed on the connecting portion;
- a connecting portion of the plurality of cylinders or cylinders is provided with a tapered portion for connecting peripheral surfaces of the plurality of cylinders or cylinders;
- a taper portion provided with a tapered portion, or a combination thereof, wherein a mask for forming a pattern of a lithographic antenna on the four-segment winding is in close contact with the outer peripheral surface of the cylindrical insulating body base.
- a spiral non-transparent portion formed on the transparent sheet and a multi-stage connection of a plurality of cylinders or cylinders having a cylindrical or cylindrical shape or different diameters having the same axis.
- 4 lines In a method of forming a pattern of a several-turn antenna, a metal film is laminated and formed with a uniform thickness on the circumferential surface of the cylinder or the cylinder, and after applying a photosensitive agent thereon, the mask is adhered in a close contact state, The conductive pattern having a shape corresponding to the transparent portion is obtained by removing the mask from the photosensitive agent portion exposed from the transparent portion of the mask and removing the unexposed photosensitive agent and the metal film immediately below the unexposed photosensitive agent.
- Each is characterized by
- a shield plate is interposed between a four-segment winding hereditary antenna device and a control circuit disposed therebelow, and a shield plate is provided on the side surface of the antenna element of the shield plate.
- a radio wave absorber layer for absorbing radio waves is provided, and the shield plate is further provided with a ferrite layer on the upper surface of an aluminum or copper substrate. It is characterized by being layered.
- FIG. 1 is a perspective external view showing one embodiment of a four-segment spiral helical antenna of the present invention
- FIGS. 2 (a), 2 (b) and 2 (c) are diagrams showing actual measurement results of a specific example of the present invention
- a) (b) and (c) are diagrams showing the configuration and characteristics of an antenna in which the required width of taper is formed only at the tip
- Figs. 4 (a), (b) and (c) show that the taper length at the tip is increased
- Fig. 5 (a), (b), and (c) are diagrams showing the configuration and characteristics of an antenna with a slight taper over a single cylinder or cylinder, respectively.
- FIG. 1 is a perspective external view showing one embodiment of a four-segment spiral helical antenna of the present invention
- FIGS. 2 (a), 2 (b) and 2 (c) are diagrams showing actual measurement results of a specific example of the present invention.
- a) (b) and (c) are
- FIG. 7 is a diagram showing gain and axial ratio characteristics in each embodiment of the four-segment helical antenna of the present invention.
- FIG. 7 shows a mask used for carrying out the method of the present invention, and a pattern forming method by vapor deposition or the like using the mask.
- FIG. 8 is a cross-sectional view showing an embodiment of a four-segment spiral helical antenna according to the present invention
- FIG. 9 is a four-segment spiral helical antenna shown in FIG.
- Figure 10 is an external perspective view of the tenor
- Figure 10 is a diagram showing the radiation characteristics of the four-segment helical antenna shown in Figure 8
- Figure 11 is a cross-sectional view showing an example of a conventional four-segment spiral helical antenna
- Figure 12 Fig. 13 (a), (h), and (c) show the specific dimensions of a conventional single-column four-segment helical antenna and the two baluns.
- Fig. 14 shows the results of measuring the standing wave ratio (SWR) when looking at the antenna side from each input end.
- Fig. 14 is a cross-sectional view showing an example of a conventionally known 4-segment spiral helical antenna.
- FIG. 15 is a schematic diagram showing an example of the radiation pattern of the four-segment spiral helicante in FIG.
- FIG. 1 is a perspective view showing a first embodiment of a four-segment spiral helical antenna according to the present invention. It is an external view.
- the four conductor patterns 6 are spirally formed in the same manner as the conventional antenna. Is formed.
- the features of this embodiment are that two cylindrical portions having different diameters are arranged coaxially and in a vertical positional relationship, and that a tip portion and a tapered portion are provided between the two cylindrical connecting portions.
- FIG. 7 (a), 2 (b) and 2 (c) are diagrams showing the measurement results of the first embodiment of the present invention.
- the upper and lower two cylindrical portions 2 and 3 of the shape shown in FIG. (mm), 25 (mm) and other dimensions are set as shown in Fig. 7 (a), and the SWR of 1.53 GHz to 1.5 GHz and 1.63 GHz to 66 GHz is 1-
- This figure shows the characteristics of the VSWR seen from the two input terminals of the balun of the 4-segment helical 'antenna manufactured with other dimensions determined as shown below.
- (b) By comparing with the conventional characteristic diagram of (c), the effect of improving the characteristic in the present embodiment will be clear.
- the SWR is 1.5 or less in all of the desired frequency range in each of Figs. 13 (b) and 13 (c).
- the improvement effect described above is not limited to the shape shown in FIG. 1, but is similarly recognized in various other modified shapes.
- Fig. 3 (a) shows an antenna with a required width taper only at the tip. Its characteristics are as shown in (b) and (c). Despite the deterioration of WR, it has been improved compared to the conventional one.
- FIG. 4 (a) shows an antenna in which the taper width of the distal end portion is increased. In this case, the characteristics are almost the same as those shown in FIG. 3 and are shown in FIGS. 4 (b) and 4 (c).
- Fig. 5 (a) shows a single cylinder or cylinder with a slight taper, and this shape also makes the overall characteristics better than the conventional one as shown in Fig. 5 (b) and (c). Improvement is observed.
- FIG. 6 shows the gain and the axial ratio characteristics in each embodiment of the four-point fractional-turn helical antenna of the present invention described above. Note that the antenna characteristics of the conventional single columnar shape shown in Figs. 12 and 13 are also shown for easy comparison with the conventional one.
- FIG. 7 is an explanatory view of a mask used for carrying out the method of the present invention and a pattern forming method by vapor deposition using the mask, and the outer diameter shown in FIG. 1 is made of Teflon which is not constant at each position in the axial direction.
- This figure shows a case where a spiral antenna pattern is formed on the outer peripheral surface of a multi-stage cylindrical body (antenna base) 61 using a mask 64.
- the mask 64 is composed of a bag 65 having an inner surface shape that is in close contact with the outer peripheral surface of the multi-stage cylindrical body 61.
- the bag 65 is made of, for example, a transparent and thin resin sheet.
- the large-diameter bottom surface of the bag body 65 is left open, and as shown in the figure, the mask mounting is completed only by covering the multi-stage cylindrical body 61 from above.
- the bag body 65 has a non-transparent portion of the ground portion 66 and a plurality of transparent portions 67 on the peripheral surface having a shape corresponding to the antenna pattern to be formed on the outer peripheral surface of the multi-stage cylindrical body 61. It is formed spirally in this parallel.
- the bag 65 used in the present invention may have at least the lower end in the axial direction open, and the upper end in the axial direction may be open.
- the vapor deposition step of the pattern using the mask 64 having the above configuration will be described.
- the surface of the multi-stage cylindrical body 61 made of Teflon is processed into a rough surface using a chemical, and then the vapor deposition, plating, etc. are performed.
- a metal layer is uniformly laminated and a photosensitive agent is uniformly applied on the metal layer in a dark room.
- a mask 64 is put on the columnar body 1 on which the photosensitive agent has been applied, and is brought into close contact therewith.
- the reason for processing the surface of the multi-stage cylindrical body made of Teflon into a rough surface is to enhance the adhesion to the metal deposited or plated metal.
- the exposure light when the exposure light is irradiated uniformly while rotating the masked multi-stage cylinder ⁇ : 61, the photosensitive agent located in the transparent portion 67 having the shape% corresponding to the antenna pattern is exposed. To solidify. At the time of exposure, the exposure light may be irradiated from all directions of the fixed multi-stage cylinder without rotating the multi-stage cylinder. '
- the mask 64 is removed, and the unexposed photosensitizer is removed with a hypo (sodium thiosulfate) or the like. Then, the metal film located under the removed unexposed photosensitizer is etched with an etching solution. To remove.
- the antenna pattern can be obtained by washing the solidified photosensitive agent.
- etching is performed according to this procedure, pattern formation on the multi-stage cylindrical body can be easily and accurately realized, so that mass production is possible and cost reduction can be achieved.
- the etching method using the mask can be applied not only to a multistage cylindrical body but also to a pattern formation for a simple cylindrical body, a polygonal pillar, a conical body, and other three-dimensional objects. Regardless of the application to any three-dimensional object, the above-described etching operation can be easily performed by creating a bag-shaped mask that closely adheres to the shape of the outer peripheral surface.
- cylindrical body is a concept including a multistage cylindrical body, a polygonal pillar, a conical body, and other cubes in addition to a cylindrical body.
- a resin sheet in an unfolded state having a non-transparent portion 66 and a transparent portion S7 corresponding to an antenna pattern is cut in advance into a required shape, This sheet is rolled into a bag and bag S 5 Is preferably formed.
- the tapered portion of the multi-stage cylinder it is possible to relatively easily obtain a bag having a desired shape by heating and molding the above bag with a mold having the same shape as the workpiece.
- the adaptive frequency band can be expanded. For example, simultaneous transmission / reception using channel frequencies separated by a required frequency is possible. This is effective when communication is performed with a single antenna.
- the required conductor pattern can be accurately formed on the peripheral surface of a general cylinder or cylinder, particularly on the peripheral surface of a multi-stage cylinder having a different thickness. This is effective in mass producing helical antennas with several turns of four lines.
- FIG. S is a sectional view showing a second embodiment of the present invention
- FIG. 9 is an external perspective view thereof.
- the four-segment winding helicopter device shown in this figure was created assuming that it is fixed to the body of an aircraft or the like (the surface to which the antenna is to be attached) 7 1.
- 7 2 A shield plate 7 4 supported by the upper end of a column 7 3 standing upright, an antenna body 7 5 fixed on the shield plate 7 4, and a base 7 below the shield plate 7 4 It has a hybrid circuit (HYB) 76 and a balun 77 arranged on the upper side.
- HYB hybrid circuit
- the antenna body 75 includes a mylar plate 10 and two narrow strip-shaped antenna elements 81, 82 wound spirally around the mylar plate 10. Each of these antenna elements 8 1 , 82 are connected to param 77 via semi-rigid cables 83, 84.
- the shape of the antenna body 75 may be the type shown in FIGS. 1 and 2 (a) as shown, or may be the shape shown in FIGS. 3 (a), 4 (a) and 5 (a). It may be the one shown in (a). Furthermore, the conventional straight type antenna element shown in FIGS. 12 and 13 (a) may be used.
- the shield plate 74 is composed of, for example, an aluminum substrate 85 and a radio wave absorber layer 86 such as a flat layer laminated on the upper surface of the aluminum substrate 85.
- the shield plate 74 is disposed between the antenna body 75 and the control circuit such as the hybrid circuit 76 and the paran 77 so that the antenna body 75 or the base 72 near the antenna from the antenna body can be disposed. Since the radio wave radiated to the antenna is absorbed by the radio wave absorber layer 16, the adverse effect of the reflected radio wave on the radiation characteristics of the antenna can be reduced.
- an electric field shielding effect between the antenna body and a control circuit such as a hybrid circuit and a paran can be obtained.
- m 10 is a diagram showing the vertical gain of the radiation pattern of the radio wave radiated from the four-segment helical antenna according to the embodiment of the present invention, connecting the minimum values of the gain in each direction.
- the variation between the inner radiation pattern P 1 ′, which is the elliptic line, and the outer radiation pattern P 2 ′, which is the line connecting the maximum values of the gains in each direction, has become smaller.
- the overall shape of the radiation pattern is closer to a circle, and it can be seen that the radiation characteristics of the antenna are improved and are closer to ideal.
- the balun 77 is a part that converts the balance / unbalance between the hybrid circuit 76 and the antenna body 75.
- a shield plate 74 is interposed between the antenna body 75 and the circuits 75 and 76. As a result, the radio waves radiated toward the base or the airframe are absorbed by the shield plate, so that the above-described problems are prevented from occurring.
- the deterioration of the radiation characteristic caused by the reflection of a part of the radio wave radiated from the antenna main body to the antenna base, the airframe, etc. It is possible to prevent malfunctions caused by a part of the radio wave entering the control circuit located below the antenna body.
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Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE69028919T DE69028919T2 (de) | 1990-01-08 | 1990-12-18 | Wendelantenne mit geteilter vierdrahtwicklung und verfahren zu deren herstellung |
| EP91900334A EP0465658B1 (en) | 1990-01-08 | 1990-12-18 | Four-wire fractional winding helical antenna and manufacturing method thereof |
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2/1231 | 1990-01-08 | ||
| JP123190 | 1990-01-08 | ||
| JP26333190 | 1990-10-01 | ||
| JP2/263331 | 1990-10-01 | ||
| JP31968990 | 1990-11-21 | ||
| JP2/319689 | 1990-11-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1991011038A1 true WO1991011038A1 (en) | 1991-07-25 |
Family
ID=27274824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP1990/001650 Ceased WO1991011038A1 (en) | 1990-01-08 | 1990-12-18 | Four-wire fractional winding helical antenna and manufacturing method thereof |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5353040A (ja) |
| EP (1) | EP0465658B1 (ja) |
| AU (1) | AU643244B2 (ja) |
| CA (1) | CA2047694C (ja) |
| DE (1) | DE69028919T2 (ja) |
| WO (1) | WO1991011038A1 (ja) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5859621A (en) * | 1996-02-23 | 1999-01-12 | Symmetricom, Inc. | Antenna |
| US5945963A (en) * | 1996-01-23 | 1999-08-31 | Symmetricom, Inc. | Dielectrically loaded antenna and a handheld radio communication unit including such an antenna |
| US6181297B1 (en) | 1994-08-25 | 2001-01-30 | Symmetricom, Inc. | Antenna |
| US6300917B1 (en) | 1999-05-27 | 2001-10-09 | Sarantel Limited | Antenna |
| US6552693B1 (en) | 1998-12-29 | 2003-04-22 | Sarantel Limited | Antenna |
| US6690336B1 (en) | 1998-06-16 | 2004-02-10 | Symmetricom, Inc. | Antenna |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE506329C2 (sv) * | 1995-06-20 | 1997-12-01 | Saab Ericsson Space Ab | Antennelement, koniskt helixformat, för polarisationsrenhet inom brett frekvensområde |
| US5572172A (en) * | 1995-08-09 | 1996-11-05 | Qualcomm Incorporated | 180° power divider for a helix antenna |
| US5828348A (en) * | 1995-09-22 | 1998-10-27 | Qualcomm Incorporated | Dual-band octafilar helix antenna |
| US5955997A (en) * | 1996-05-03 | 1999-09-21 | Garmin Corporation | Microstrip-fed cylindrical slot antenna |
| SE9700740L (sv) | 1997-03-03 | 1998-04-27 | Saab Ericsson Space Ab | Antennelement för cirkulär polaristaion |
| SE511154C2 (sv) * | 1997-12-19 | 1999-08-16 | Saab Ericsson Space Ab | Kvadrifilär spiralantenn för dubbla frekvenser |
| JP2000091827A (ja) * | 1998-09-07 | 2000-03-31 | Ace Technol Co Ltd | セラミック誘電体を用いた携帯通信端末器用ヘリカルアンテナ及びその製造方法 |
| GB9902765D0 (en) | 1999-02-08 | 1999-03-31 | Symmetricom Inc | An antenna |
| US6088000A (en) * | 1999-03-05 | 2000-07-11 | Garmin Corporation | Quadrifilar tapered slot antenna |
| US6407709B1 (en) | 1999-07-16 | 2002-06-18 | Garmin Corporation | Mounting device with integrated antenna |
| KR20010058988A (ko) * | 1999-12-30 | 2001-07-06 | 구기덕 | 전자파 차단 기능을 가지는 안테나 및 그 제조 방법 |
| GB0027128D0 (en) * | 2000-11-04 | 2000-12-20 | Univ Bradford | Multi-band antenna |
| NZ525603A (en) * | 2000-12-05 | 2004-11-26 | Eung Soon Chang | A device for reducing the electromagnetic wave of a mobile communication terminal |
| RU2190941C1 (ru) * | 2001-01-09 | 2002-10-10 | Дочернее государственное унитарное предприятие "Научно-производственный центр спутниковых координатно-временных технологий "КОТЛИН" Федерального государственного унитарного предприятия "Российский институт радионавигации и времени" | Блок приемника сигналов спутниковых радионавигационных систем |
| FR2838524B1 (fr) * | 2002-04-15 | 2005-11-18 | Radiotelephone Sfr | Systeme et procede de localisation d'un terminal mobile, notamment pour le sauvetage d'une personne en detresse, et dispositif d'eveil d'un terminal mobile correspondant |
| AU2003226916A1 (en) * | 2003-04-04 | 2004-10-25 | Rene Bozzini | Invention concerning the removal of radiation from mobile phones and other electrical/electronic appliances |
| US7038636B2 (en) * | 2003-06-18 | 2006-05-02 | Ems Technologies Cawada, Ltd. | Helical antenna |
| US7908080B2 (en) | 2004-12-31 | 2011-03-15 | Google Inc. | Transportation routing |
| DE112009005121B4 (de) | 2009-08-06 | 2018-07-05 | Indian Space Research Organisation Of Isro | Gedruckte, quasi-konische Streifenwendel-Arrayantenne |
| US8994607B1 (en) * | 2011-05-10 | 2015-03-31 | The United States Of America As Represented By The Secretary Of The Navy | Spiral/conformal antenna using noise suppression/magnetic sheet above ground plane |
| US8552922B2 (en) | 2011-11-02 | 2013-10-08 | The Boeing Company | Helix-spiral combination antenna |
| US9893715B2 (en) | 2013-12-09 | 2018-02-13 | Shure Acquisition Holdings, Inc. | Adaptive self-tunable antenna system and method |
| JP5922722B2 (ja) * | 2014-08-07 | 2016-05-24 | 日本電業工作株式会社 | アンテナ装置 |
| US11404771B2 (en) * | 2019-12-19 | 2022-08-02 | L3 Technologies, Inc. | Singular process printed antenna with feed network and systems and methods related to same |
| GB2630024A (en) * | 2023-05-10 | 2024-11-20 | Leonardo UK Ltd | An antenna |
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| JPS41849B1 (ja) * | 1961-10-14 | 1966-01-27 | ||
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| US4635070A (en) * | 1983-12-19 | 1987-01-06 | Granger Associates | Dual mode antenna having simultaneous operating modes |
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| US5198831A (en) * | 1990-09-26 | 1993-03-30 | 501 Pronav International, Inc. | Personal positioning satellite navigator with printed quadrifilar helical antenna |
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1990
- 1990-12-18 EP EP91900334A patent/EP0465658B1/en not_active Expired - Lifetime
- 1990-12-18 AU AU68945/91A patent/AU643244B2/en not_active Ceased
- 1990-12-18 DE DE69028919T patent/DE69028919T2/de not_active Expired - Fee Related
- 1990-12-18 WO PCT/JP1990/001650 patent/WO1991011038A1/ja not_active Ceased
- 1990-12-18 CA CA002047694A patent/CA2047694C/en not_active Expired - Fee Related
-
1993
- 1993-08-16 US US08/109,001 patent/US5353040A/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS41849B1 (ja) * | 1961-10-14 | 1966-01-27 | ||
| JPS5497353A (en) * | 1978-01-19 | 1979-08-01 | Mitsubishi Electric Corp | Conical and spiral antenna |
| JPS5799006A (en) * | 1980-12-12 | 1982-06-19 | Nec Corp | Helical antenna |
| JPS59141802A (ja) * | 1983-01-26 | 1984-08-14 | ジオフイジカル サーベイ システムズ, インコ−ポレイテツド | 周波数独立アンテナ |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6181297B1 (en) | 1994-08-25 | 2001-01-30 | Symmetricom, Inc. | Antenna |
| US5945963A (en) * | 1996-01-23 | 1999-08-31 | Symmetricom, Inc. | Dielectrically loaded antenna and a handheld radio communication unit including such an antenna |
| US5859621A (en) * | 1996-02-23 | 1999-01-12 | Symmetricom, Inc. | Antenna |
| US6690336B1 (en) | 1998-06-16 | 2004-02-10 | Symmetricom, Inc. | Antenna |
| US6552693B1 (en) | 1998-12-29 | 2003-04-22 | Sarantel Limited | Antenna |
| US6300917B1 (en) | 1999-05-27 | 2001-10-09 | Sarantel Limited | Antenna |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0465658A1 (en) | 1992-01-15 |
| US5353040A (en) | 1994-10-04 |
| DE69028919D1 (de) | 1996-11-21 |
| DE69028919T2 (de) | 1997-02-13 |
| CA2047694C (en) | 1996-02-27 |
| AU643244B2 (en) | 1993-11-11 |
| AU6894591A (en) | 1991-08-05 |
| EP0465658B1 (en) | 1996-10-16 |
| CA2047694A1 (en) | 1991-07-09 |
| EP0465658A4 (en) | 1992-04-29 |
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