CN1099721C - Antenna for frequences in excess of 200 MHZ - Google Patents
Antenna for frequences in excess of 200 MHZ Download PDFInfo
- Publication number
- CN1099721C CN1099721C CN97193099.6A CN97193099A CN1099721C CN 1099721 C CN1099721 C CN 1099721C CN 97193099 A CN97193099 A CN 97193099A CN 1099721 C CN1099721 C CN 1099721C
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- antenna
- wireless communication
- communication unit
- center
- antenna element
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- 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
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- Details Of Aerials (AREA)
- Support Of Aerials (AREA)
- Transceivers (AREA)
- Telephone Set Structure (AREA)
- Mobile Radio Communication Systems (AREA)
- Burglar Alarm Systems (AREA)
- Waveguide Aerials (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
A miniature antenna (10) for operation at frequencies in excess of 200 MHz has a ceramic core (12) in the form of a cylindrical rod having a relative dielectric constant greater than 5. Plated on the outer surfaces of the core is an antenna element structure comprising a single pair of oppositely disposed helical elements (10A, 10B) having a common central axis coincident with the central axis of the core. At a distal end of the antenna, they are connected to a coaxial feeder structure passing axially through the core, and at their proximal ends they are connected to the rim of a cylindrical trap conductor (20) which, at the proximal end of the core is coupled to the screen of the feeder structure. At the operating frequency, the antenna behaves as a loop, the radiation response having nulls directed generally perpendicularly on each side of a plane containing the central axis of the core and the connections of the helical elements with the feeder structure and with the conductive sleeve. The antenna is intended primarily for a handheld communication unit such as a cellular or cordless telephone handset, the present of the nulls in the radiation pattern reducing radiation into the user's head.
Description
The present invention relates to a kind ofly be higher than the antenna of working on the 200MHZ frequency and relating to a kind of this antenna wireless communication device that comprises.
The antenna that honeycomb fashion or cordless portable part need is that mainly it should be small-sized and omnidirectional.For the mobile phone of working in the 2GHZ frequency range at 800MHZ, this antenna generally is an extending rod, and it has and approximates quarter-wave length greatly when elongation, or the helix with several circles.The common part of this antenna is installed in the cell phone apparatus and a part is stretched out from the end of this equipment of adjacency earphone.A difficult point of radio mobile telephone set is to follow the radiation meeting of extending of the forceful electric power of close antenna generation and user's head that magnetic field causes to produce thing noticeable, insalubrity.Usually, 90% radiant power is particularly absorbed by the part of the rich blood vessel such as ear and lip by head.The radiation that is absorbed by head also can cause radiation efficiency low and then rely in reducing with respect to the operating handset scope of the orientation of the user of nearest base station and mobile phone.
The another kind of antenna of work comprises so-called inverted-F antenna in the frequency range (800MHZ is to 2GHZ) that is adopted by cellular phone.This antenna has two resonance patch cords, and one is placed on above another.Thereby this antenna mechanically is that benzene is heavy.
At US-A-5, in 854,608, a kind of grapefruit satellite navigation antenna with plurality of units is disclosed, these unit are to be made of four spirality conductive traces on the outer surface of ceramic rod, this ceramic rod relative dielectric constant is that 36 material is made.These spiral unit are mainly for receiving circularly polarized signal arrangement.
An object of the present invention is to provide a kind of modified model radio mobile telephone set antenna that makes the radiation minimizing that enters user's head.
According to the present invention, wireless communication unit with antenna, comprise an antenna unit structure, it comprises a pair of antenna element that is provided with and constitutes loop together of expanding simultaneously with relative configuration, antenna comprises an electric insulation heart, described wireless communication unit is the handheld unit with wireless set and an indispensable earphone, is used to send the acoustic energy from the inner face of this unit, is placed in the user in use in one's ear; Antenna is coupled to transceiver and is arranged in the position of earphone; The nuclear of antenna is the former attitude material that has greater than 5 relative dielectric constant, antenna element or in abutting connection with the center outer surface; Described antenna unit structure has a radiation diagram, and this radiation diagram has a zero-bit being transverse on the direction of antenna element; Antenna element so is installed in the wireless communication unit, i.e. the general vertical described inner face towards this equipment of this zero-bit is to reduce on user's cephalad direction the radiation level from this unit.
According to the present invention, a kind of being used for comprises an electric insulation center of making greater than 5 material with relative dielectric constant (ε r) being higher than the antenna of working on the 200MHZ frequency, with one be arranged on or antenna unit structure on the outer surface of center, the material of center has occupied the overwhelming majority of the volume that is limited by the center outer surface, wherein antenna unit structure comprises an elongation antenna element that list is right, they are arranged on opposite configuration or on the center outer surface and be interconnected in separately end, so that form together around the path of the electric conducting material of center, the other end of antenna element constitutes feed and connects.In optimal antenna according to the present invention, center is cylindrical, has a central shaft and antenna element and expands simultaneously, and each unit is extending between the axially-spaced locations on the outer cylinder surface of center.These unit preferably deposit or are bonded in the metallic traces on the center, and make on each interval location, and the interval location separately of antenna element is opposite fully basically.Compartment all is arranged in the single plane of the central shaft that comprises center basically, connect together to form loop with linking conductor with each several part, be connected to the feed connection of loop at the each several part of another interval location by the cross unit that on the center end face, radially extends usually at an interval location.Feed connects can be connected to coaxial feeder structure.The radiation diagram of antenna has a vertical zero-bit of pointing on each side of plane.Except two zero-bits, radiation diagram is an omnidirectional.
In telephone bandset that antenna is packed into, just can reduce to be coupled to the radiation intensity of user's head basically.On (800 to 900MHZ and 1800 to the 1200MHZ scope) frequency of being concerned about, this antenna can constitute compactization.For example, the DECT that works in the 1880-1900MHZ frequency range (digital europe cordless telephone) antenna has the length of 20.2mm and the diameter of 5mm usually, adopts the dielectric material with ε r=36.
So according to a second aspect of the invention, a kind of hand-held radio communication equipment is provided, this equipment has a radio set, an indispensable earphone, be used to send acoustic energy from the equipment inner face, in use place facing to user's ear, with an antenna that is coupled to transceiver and is arranged on the earphone zone, wherein, this antenna comprises: one has relative dielectric constant (ε r) greater than 5 electric insulation center, one with opposite configuration extend simultaneously be arranged on or contiguous center outer surface on the connect together antenna unit structure of a pair of antenna element that constitutes loop, this antenna unit structure has a radiation diagram thus, this figure has a zero-bit being transverse on the direction of antenna element, wherein antenna so be installed in this equipment so that this zero-bit general vertically towards the inner face of equipment, thereby reduce the level of the radiation of transceiver on user's cephalad direction.At the antenna center is the situation of cylindrical form, and it also can be cydariform or clavate, and has a pair of antenna element that extends simultaneously, and its end is arranged in the plane of the central shaft that comprises center, and this plane preferably is parallel to the inner face of this equipment.In order to the trapper (trap) of the form of metal sleeve and the antenna that balanced-to-unblanced transformer provides, not only allow at condition feed antennas loop in a basic balance, and reduce the influence of the suitable small connect ground area that embodies by this equipment, and a useful surface region is provided, be used for for example fixing up an aerial wire by welding or gripping.
Because the cause of machinery and electric stability, the material of center can be ceramic, for example, and the microwave ceramic material such as Zirconium titanate-based material, magnesium titanate calcium, barium titanate zirconium and barium neodymium titanate or these composition.Best relative dielectric constant (ε r) is more than 10, or even 20, use Zirconium titanate-based material can reach 36 numeral.This material has very little dielectric loss, thereby the Q value of antenna more is subject to the influence of the resistance of antenna element than center loss.
It is the same with its overall diameter at least big axially extended and with the cylindrical center of the solid material that radially extends of 50% solid material of overall diameter at least that specific most preferred embodiment of the present invention has a usefulness.So this center can be the form of pipe, this pipe has half the narrower axial passage of diameter of whole diameter of center at the most.
Though the optimal antenna unit is spiral, and the half-turn around center is made in each unit, as in the situation of the above-mentioned antenna of using the spiral unit, also can form these unit, so that they are parallel to central shaft and still realize having a radiation diagram that is transverse to the zero-bit of axle.
In optimal antenna, antenna element is from end fed, center has one to be laid from the central passage of the vicinity of center or installation end coaxial feeder structure that extend and that launch endways, and radially the unit is coupled to the antenna element on the cylindrical outer surface of center respectively interior the and outer conductor of feeder line structure there.Linking conductor can be annular, and helps with the cylindrical casing structure on the outer surface of center neighbouring part.
The selection of antenna unit structure influences the bandwidth of antenna, compares with the antenna element of the central shaft that is parallel to center, because use helical antenna to cause increasing bandwidth.
Example is in conjunction with the drawings described the present invention now, wherein:
Fig. 1 is the perspective view according to antenna of the present invention;
Fig. 2 is the radiation diagram of presentation graphs 1 antenna;
Fig. 3 is the telephone bandset perspective view that antenna of the present invention is housed; With
Fig. 4 is the perspective view according to second antenna of the present invention.
With reference to Fig. 1, antenna 10 according to the present invention has the antenna element 10A that forms two longitudinal extensions of metallic conductor track on the periphery of ceramic core 12, the antenna unit structure of 10B.Center 12 has axis channel 14 and this passage that has interior metal inner lining 16 and places axially interior feeder conductor 18.Inner wire 18 and liner 16 form a feeder line structure in this situation, are used for feed line is fed to the antenna element 10A at feed placement place on the terminal surface 12D of center, 10B.Antenna unit structure also comprises corresponding radially antenna element 10AR, and 10BR is connecting longitudinal extension unit 10A separately, the complete end opposite 10AE of 10B, and 10BE goes up the formation metallic traces to the terminal surface 12D of feeder line structure.Antenna element 10A, the other end 10AF of 10B, 10BF also are antipodal, and by annular public virtual earthing conductor 20 with form link around the plated sleeve of the adjacent end of center 12.This sleeve pipe 20 is connected to the liner 16 of axial passage 14 successively by the electroplate on the proximate end face 12P of center 12 22.
In this most preferred embodiment, the neighbouring part of conductive casings 20 topped antenna centers 12, thus around feeder line structure 16,18, the material of center 12 is filled in whole space between the metal inner lining 16 of axial passage 14 and the sleeve pipe 20.Sleeve pipe 20 forms the cylinder that is connected to liner 16 by the electroplate 22 of the proximate end face 12P of center 12, sleeve pipe 20 and electroplate 22 be combined to form a balanced to unbalanced transformer 20 so that the conversion between the poised state of approximate axial positions in the nonequilibrium condition at the approach end place of antenna and the plane of the signal in the transmission line that constitutes by feeder line structure 16,18 at the top edge 20U of sleeve pipe 20.In order to realize this effect, the axial length of sleeve pipe 20 makes that under the situation of the bottom center material that has high dielectric constant, balanced to unbalanced transformer has an electrical length in the about λ of operating frequency of antenna/4.Shortening effect because the center material of antenna has one, is to fill and the feeder line structure of sleeve pipe 20 has short electrical length with the dielectric material 17 with less dielectric constant around the annulus of inner wire 18.Therefore, at the signal of the end of feeder line structure 16,18 at least near balance.
Another effect of sleeve pipe 20 is to make signal in the scope of the operating frequency of antenna, and the edge 20U of sleeve pipe 20 isolates with the ground that outer conductor 16 by feeder line structure provides effectively.The electric current that this means circulation between antenna element 10A, 10B is restricted to edge 20U and is isolated by the ring that antenna unit structure constitutes.So sleeve pipe 20 plays the isolation trapper.
In this embodiment, longitudinal extension unit 10A, 10B are equal lengths, and each is the simple helix of realizing with around the axle 12A half-turn of center 12.
Should be noted that antenna element 10A, four end 10AE of 10B, 10AF, 10BE, 10BF are arranged in the common plane of the axle 12A that comprises center 12.This common plane is represented with the dotted line of Fig. 1.The feed connection that is connected to antenna unit structure also is arranged in common plane 24.This antenna structure is so constituted.In the elementary section of this structure, ripple on the antenna is responded to whole electric current and in feed placement, promptly feeder line structure 16,18 is connected to the place of antenna unit structure by being incident on from the direction 28 that is orthogonal to plane 24, and the plane wave front summation is zero.In fact, two unit 10A, 10B are configuration and the either side that is weighted in plane 24 equally equally, draws the symmetrical vector around the plane.Each unit 10A, 10B can think to be made of a plurality of increments, and its each unit is in antipodal another unit 10A on decentre axle 12A is equidistant, the respective complementary increment condition of 10B.
Have half-turn spirality unit 10A, the antenna unit structure of 10B is carried out with the method that is similar to the simple flat surface loop, and in its radiation diagram, wireless section has a zero-bit on axle 12A and the direction perpendicular to plane 24.Therefore, radiation diagram is being transverse to the shape that is roughly 8 fonts on the vertical and horizontal plane of a 12A, as shown in Figure 2.With respect to the orientation of the radiation diagram of the perspective view of Fig. 1 by axle x illustrated in figures 1 and 2, y, the axle system of z is represented.Radiation diagram has two zero-bits or recess, zero-bit on each side of antenna and each concentrate on the line shown in Figure 1 28.
This antenna has special applications on the frequency between 20MHZ and the 5GHZ.Radiation diagram makes antenna use especially at hand-held communication device, for example in honeycomb fashion or the cordless portable part, as shown in Figure 3.A zero-bit for directional radiation on user's cephalad direction, antenna is so installed: its central shaft 12A (see figure 3) and plane 24 (see figure 1)s all are parallel to the inner face 30I of mobile phone 30, particularly at the inner face 30I at earphone 32 positions, as directed, also vertically operation in mobile phone 30 of axle 12A.And, the relative orientation of antenna, its radiation diagram and mobile phone 30 all pass through axle system x shown in Figure 3, y, it is clearly that z compares with the representation of the axle system of Fig. 1 and 2.
The optimal material that is used for the center 12 of antenna is the material of zirconia titanate (zirconium-titanate-based) for the basis.This material has relative dielectric constant to be 36 and to point out that also its size and electrical stability change with temperature.Dielectric loss is insignificant.Also available punching press of center or compacting are produced.
Utilization has more higher than air basically relative dielectric constant, the center material of ε r=36 for example, as mentioned above, be used for generally having core diameter at 1880MHZ antenna of DECT frequency band in the 1900MHZ scope and be approximately 5mm and longitudinal extension unit 10A, 10B has longitudinal tensile strain (promptly being parallel to central shaft 12A) and is approximately 12.7mm.Unit 10A, the width of 10B is approximately 0.3mm.At 1890MHZ, the length of balanced-to-unblanced transformer sleeve pipe 20 is generally in 7.5mm or shorter scope.Operation wavelength λ represents with the air wavelength, these sizes are: for unit 10A, 10B vertical (axially) extends: 0.08 λ, for core diameter: 0.0315 λ, for the balanced-to-unblanced transformer sleeve pipe: 0.047 λ or shorter and for track width: 0.00189 λ.Antenna element 10A, the accurate dimension of 10B can be according to determining in the design phase by the exploration that guarantees the eigenvalue delay measurements.
During antenna was made, the adjusting of electroplating unit size can be at related U.S. patent USA5 therewith, and the method described in 854,608 is carried out in conjunction with Fig. 3 to 6.
Undersized antenna makes it be particularly suitable for handheld device such as mobile phone handsets and other personal communication devices.At plating balanced-to-unblanced transformer sleeve pipe 20 on the proximate end face 12P of center 12 and/or electrodeposited coating 22 antenna is directly installed on printed circuit board or other ground structure with the method for specific safety.Typically, if antenna by end-installation, proximate end face 12P can be welded to the ground plane of the upper surface of printed circuit board, simultaneously in feed-through 18 directly by the conductive traces of an eyelet welding on the plate to its lower surface.On the other hand, sleeve pipe 20 can be clamped or be welded to the printed circuit board ground plane and be parallel to a 12A simultaneously and extends, the end portion of antenna thereupon, and location antenna element 10A, 10B surpass ground plane and extend.Can be with antenna 10 or whole erection at mobile device, or part is as shown in Figure 3 protruded.
The present invention is shown in Fig. 4 as an alternative embodiment of the antenna of portable wireless communication cell mesh.
With reference to Fig. 4, electroplate the antenna element 10A on the periphery of center 12,10B, this moment, the opposite side the latter was parallel to central shaft 12A.Among the embodiment as Fig. 1, antenna element 10A, 10B is through the radially unit 10AR on the terminal surface 12D of center 12, and 10BR is connected respectively to the interior and outer conductor 18,16 of feeder line structure.Sleeve pipe 20 forms an isolation trapper again, so that its top edge forms the part from a feeder conductor 16 to another 18 loops that extend around center.In others, the antenna of Fig. 4 is similar to Fig. 1.It has identical radiation diagram, and this figure has direct transversal central shaft and perpendicular to comprising unit 10A, the zero-bit on the plane of 10B and feeder line structure 16,18.
Claims (31)
1. have the wireless communication unit (30) of antenna (10), comprise an antenna unit structure, it comprises that a pair of the expansion simultaneously with relative configuration is provided with the antenna element that also constitutes loop together, and antenna comprises an electric insulation heart, it is characterized in that,
Described wireless communication unit is the handheld unit with wireless set and indispensable earphone (32), is used to send the acoustic energy of the inner face (30) from this unit, is placed in the user in use in one's ear;
Antenna (10) is coupled to transceiver and is arranged in the position of earphone (32);
The nuclear of antenna is the former attitude material that has greater than 5 relative dielectric constant, antenna element (10A, 10B) or in abutting connection with the center outer surface;
Described antenna unit structure has a radiation diagram, and this radiation diagram has a zero-bit being transverse on the direction of antenna element;
Antenna element so is installed in the wireless communication unit (30), i.e. the general vertical described inner face towards this equipment of this zero-bit is to reduce on user's cephalad direction the radiation level from this unit.
2. wireless communication unit according to claim 1 (30) is characterized in that, antenna center (12) is cylindrical, and its central shaft (12A) is arranged essentially parallel to the described inner surface in earphone (32) district.
3. wireless communication unit according to claim 2 (30), it is characterized in that, antenna element (10A, 10B) extend on a pair of position at interval that axially is separated by cylindrical, at each locational antenna element end (10AE, 10BE, 10AF, 10BF) radially be oppositely arranged, and be arranged in the plane (24) of inner surface that comprises central shaft (12A) and be arranged essentially parallel to the wireless communication unit (30) in earphone (32) district.
4. wireless communication unit according to claim 3 (30) is characterized in that, antenna unit structure is included in be separated by one of interval location link antenna element end (10AF, linking conductor 10BF) (20).
5. according to one of any described wireless communication unit (30) of claim 2 to 4, it is characterized in that (10A 10B) is helical form and axially common the extension to antenna element.
6. wireless communication unit according to claim 5 (30) is characterized in that, (10A 10B) makes around the central shaft half-turn in each unit.
7. wireless communication unit according to claim 4 (30), it is characterized in that, linking conductor is by constituting around cylindrical conductive casings (20), to form an isolation trapper, (10A 10B) is coupled to the axial feeder line structure (16-18) that passes center (12) with the antenna element of the interval location of being separated by at another.
8. wireless communication unit according to claim 1 (30), it is characterized in that, antenna center (12) is the solid material that has occupied the overwhelming majority of the volume that is limited by the center outer surface, antenna element (10A wherein, 10B) extend between the interval location being separated by with the central axis direction of antenna, described unit interconnects in respective end, so that constitute the conducting ring around center together, the other end of antenna element constitutes feed and connects.
9. wireless communication unit according to claim 8 (30), it is characterized in that, center (12) limits a central shaft (12A), and wherein antenna element (10A, 10B) basic common in the axial direction the extension, each unit or extend between the interval location axially being separated by on the outer surface of center, corresponding interval location (the 10AE of being separated by that makes at each position antenna element at interval of being separated by, 10BE, 10AF 10BF) is positioned at a single plane of the central shaft that comprises center substantially.
10. wireless communication unit according to claim 9 is characterized in that, center (12) is columniform and antenna element is isometric with spiral helicine, each is at the described position (10AE at interval of being separated by, 10BE, 10AF, 10BF) between around the center half-turn.
11. described wireless communication unit is characterized in that according to Claim 8-10, comprises a trapper (20) that is arranged to strengthen in the indispensability of the condition in a basic balance of feed junction.
12. described wireless communication unit comprises a feeder line structure (16-18) that passes center and be connected to described other end of antenna element according to Claim 8-10.
13. wireless communication unit according to claim 10, it is characterized in that (10A 10B) is coupled to the radial component (10AR that is positioned on the single diameter to antenna element, 10BR), and the described antenna element that will be positioned at another devices spaced apart position be coupled to feed and connect.
14. wireless communication unit according to claim 13 is characterized in that, coaxial feed (16-18) is passed center and is connected to radial position at the far-end of center.
15. wireless communication unit according to claim 14 is characterized in that, bonding conductor (20) be the annular and be connected near antenna element (10A, 10B).
16. wireless communication unit according to claim 15 is characterized in that, linking conductor comprises a cylindrical conductive sleeve pipe (20) at the far-end of the outer surface of center, and wherein, the far-end of sleeve pipe is connected to the outside of feed structure (16).
17. wireless communication unit according to claim 15, it is characterized in that, antenna element forms has a counter-lateral quadrents branch (10A, loop 10B), with the cross section that extends in each lateral section (10AR, 10BR, 20U), limit the end of the lateral section at the turning of rectangle in theory, comprise one of cross section of feed connection.
18. wireless communication unit according to claim 15 is characterized in that, (10A, 10B) opposite side in rectangular planes extends sidepiece between their end.
19. wireless communication unit according to claim 18, it is characterized in that, wherein (10A, each increment 10B) have a respective complementary increment in another lateral section to each lateral section, and this is to equate and on the contrary at interval complementary increment from the central shaft of rectangle.
20. wireless communication unit according to claim 18, it is characterized in that, antenna element constitutes the loop and the opposite zone that is connected with feed in the zone that feed is connected by configuration like this around center, these zones are relevant with the central shaft (12A) of antenna, and the resultant current in loop flows in comprising the common plane of central shaft (24).
21. wireless communication unit according to claim 20 is characterized in that, the unit is such formation: the resultant current in zone separately flows in common plane (24) with identical and parallel direction.
22. wireless communication unit according to claim 20 is characterized in that, the unit is so constituted, and the resultant current in zone separately is with parallel and rightabout flows in common plane (24).
23. according to the described wireless communication unit of claim 20-22, it is characterized in that, connecting in the opposite zone with feed, antenna element comprises conductor (20U), the opposition side on the said plane (24) between the point of this conductor in being included in this plane extends, and is fixed on the opposition side of this central shaft (12A).
24. wireless communication unit according to claim 1 is characterized in that, the relative dielectric constant of center material is greater than 10.
25. wireless communication unit according to claim 21 is characterized in that, the relative dielectric constant of center material is greater than 20.
26. wireless communication unit according to claim 1 is characterized in that, constitutes to have an operating frequency in 800MHZ arrives the 900MHZ scope.
27. wireless communication unit according to claim 1, formation have an operating frequency in 1800MHZ arrives the 2000MHZ scope.
28., it is characterized in that described antenna comprises a balanced feeding in the feed junction according to one of any described wireless communication unit of claim 1-7.
29. wireless communication unit according to claim 28 is characterized in that, loop has an electrical length of 360 ° on operating frequency of antenna.
30. wireless communication unit according to claim 1 is characterized in that, antenna has a belt radiation diagram.
31. wireless communication unit according to claim 1, it is characterized in that, antenna unit structure is a stranded loop, and this loop comprises a pair of spiral unit of expanding simultaneously with the half-turn of opposite configuration arrangement, and the end of unit is positioned on the common fair face that comprises central shaft.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9601250.5 | 1996-01-23 | ||
| GBGB9601250.5A GB9601250D0 (en) | 1996-01-23 | 1996-01-23 | An antenna |
| GB9610581A GB2309592B (en) | 1996-01-23 | 1996-05-21 | An Antenna |
| GB9610581.2 | 1996-05-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1214151A CN1214151A (en) | 1999-04-14 |
| CN1099721C true CN1099721C (en) | 2003-01-22 |
Family
ID=26308506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97193099.6A Expired - Lifetime CN1099721C (en) | 1996-01-23 | 1997-01-10 | Antenna for frequences in excess of 200 MHZ |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0876688B1 (en) |
| JP (1) | JP4467642B2 (en) |
| CN (1) | CN1099721C (en) |
| AT (1) | ATE242550T1 (en) |
| AU (1) | AU720873B2 (en) |
| CA (1) | CA2245882C (en) |
| DE (1) | DE69722590T2 (en) |
| WO (1) | WO1997027642A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9813002D0 (en) * | 1998-06-16 | 1998-08-12 | Symmetricom Inc | An antenna |
| GB9828768D0 (en) * | 1998-12-29 | 1999-02-17 | Symmetricom Inc | An antenna |
| GB9902765D0 (en) * | 1999-02-08 | 1999-03-31 | Symmetricom Inc | An antenna |
| DE19923524C1 (en) * | 1999-05-21 | 2001-04-19 | Siemens Ag | Antenna, for mobile transmitters/receivers working with different frequencies, comprises two body sections with mounting and geometric surface structures using injection molding and surface coating |
| GB9912441D0 (en) * | 1999-05-27 | 1999-07-28 | Symmetricon Inc | An antenna |
| GB2420230B (en) * | 2004-11-11 | 2009-06-03 | Sarantel Ltd | A dielectrically-loaded antenna |
| GB2444749B (en) * | 2006-12-14 | 2009-11-18 | Sarantel Ltd | A radio communication system |
| KR100821981B1 (en) * | 2007-02-02 | 2008-04-15 | 이성철 | Dielectrics omnidirection antenna |
| DE102013201685B4 (en) | 2013-02-01 | 2019-04-04 | Siemens Healthcare Gmbh | Conductor arrangement with dielectric sheath wave barrier |
| CN115693106A (en) * | 2022-11-10 | 2023-02-03 | 星启空间(南通)通信设备有限公司 | Satellite and satellite-borne antenna |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4442438A (en) * | 1982-03-29 | 1984-04-10 | Motorola, Inc. | Helical antenna structure capable of resonating at two different frequencies |
| US5346300A (en) * | 1991-07-05 | 1994-09-13 | Sharp Kabushiki Kaisha | Back fire helical antenna |
| US5708445A (en) * | 1993-01-29 | 1998-01-13 | Motorola, Inc. | Antenna assembly for radio circuit and method therefor |
| GB9417450D0 (en) * | 1994-08-25 | 1994-10-19 | Symmetricom Inc | An antenna |
-
1997
- 1997-01-10 CA CA002245882A patent/CA2245882C/en not_active Expired - Fee Related
- 1997-01-10 JP JP52662997A patent/JP4467642B2/en not_active Expired - Lifetime
- 1997-01-10 AU AU13919/97A patent/AU720873B2/en not_active Ceased
- 1997-01-10 AT AT97900334T patent/ATE242550T1/en not_active IP Right Cessation
- 1997-01-10 CN CN97193099.6A patent/CN1099721C/en not_active Expired - Lifetime
- 1997-01-10 EP EP97900334A patent/EP0876688B1/en not_active Expired - Lifetime
- 1997-01-10 DE DE69722590T patent/DE69722590T2/en not_active Expired - Lifetime
- 1997-01-10 WO PCT/GB1997/000085 patent/WO1997027642A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| WO1997027642A1 (en) | 1997-07-31 |
| AU720873B2 (en) | 2000-06-15 |
| EP0876688A1 (en) | 1998-11-11 |
| CA2245882C (en) | 2004-11-09 |
| CN1214151A (en) | 1999-04-14 |
| CA2245882A1 (en) | 1997-07-31 |
| EP0876688B1 (en) | 2003-06-04 |
| ATE242550T1 (en) | 2003-06-15 |
| AU1391997A (en) | 1997-08-20 |
| JP2000506690A (en) | 2000-05-30 |
| JP4467642B2 (en) | 2010-05-26 |
| DE69722590D1 (en) | 2003-07-10 |
| DE69722590T2 (en) | 2004-05-06 |
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