CA1223339A - Cellular mobile communications antenna - Google Patents
Cellular mobile communications antennaInfo
- Publication number
- CA1223339A CA1223339A CA000459443A CA459443A CA1223339A CA 1223339 A CA1223339 A CA 1223339A CA 000459443 A CA000459443 A CA 000459443A CA 459443 A CA459443 A CA 459443A CA 1223339 A CA1223339 A CA 1223339A
- Authority
- CA
- Canada
- Prior art keywords
- antenna system
- coupling
- conductive
- conductor
- accordance
- 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
Links
- 238000010295 mobile communication Methods 0.000 title claims description 10
- 230000001413 cellular effect Effects 0.000 title description 9
- 230000008878 coupling Effects 0.000 claims abstract description 65
- 238000010168 coupling process Methods 0.000 claims abstract description 65
- 238000005859 coupling reaction Methods 0.000 claims abstract description 65
- 230000005540 biological transmission Effects 0.000 claims abstract description 15
- 239000004020 conductor Substances 0.000 claims description 47
- 239000003990 capacitor Substances 0.000 claims description 27
- 239000011888 foil Substances 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims 19
- 230000001939 inductive effect Effects 0.000 claims 1
- 238000004891 communication Methods 0.000 description 8
- 230000005855 radiation Effects 0.000 description 8
- 239000011521 glass Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000010267 cellular communication Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- VJYFKVYYMZPMAB-UHFFFAOYSA-N ethoprophos Chemical compound CCCSP(=O)(OCC)SCCC VJYFKVYYMZPMAB-UHFFFAOYSA-N 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/1271—Supports; Mounting means for mounting on windscreens
- H01Q1/1285—Supports; Mounting means for mounting on windscreens with capacitive feeding through the windscreen
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/1207—Supports; Mounting means for fastening a rigid aerial element
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
- H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
- H01Q1/3283—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle side-mounted antennas, e.g. bumper-mounted, door-mounted
Landscapes
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Details Of Aerials (AREA)
- Support Of Aerials (AREA)
- Transceivers (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Abstract A mobile antenna system for use at frequencies in and above the 800 MHz band having a collinear radiator mounted on one surface of a dielectric such as the window of a vehicle and a tunable coupling circuit disposed internally of a conducted housing mounted on the opposite surface of the dielectric which acts as a counterpoise for coupling RF energy between the radiator and a transmission line connected to a suitable transceiver.
Description
~3~
CELLULAR MOBILE COMMUNICATIONS ANTENNA
Field of the Invention -The present invention relates to communications antennas and more particularly to mobile communications antennas for frequencies in the area of the 800MHz frequency band of the type adapted to be mounted on a non-conductive surface such as a vehicle windshield.
Background of the Invention The recent introduction of cellular telephone service which utilize frequencies in ~he 800MHz frequency band and above, has increased interest in the efficient mobile antenna systems for those frequencies. Such services typically utilize a fairly wide band width. For example, existing and/or proposed systems operate over frequency bands oE
about 800-870 MHz, 820-900 MHz and 860-840 MHz. As can be seen by the above figures, the band width of such operating systems ranges from between about 60 to about 80 MHz. Thus, any antenna designed for use with such systems should provide efficient radiation characteristics and low VSWR over these band widths.
In addition, mobile antennas for such communications systems are designed to be mounted on vehicles. Some type of permanent installation is often necessary. For preferred locations, those which provide the most uniform radiation patterns, such as roof tops, this requires mounting to the vehicle such as automobiles by cutting holes into the body and permanently mounting the antennas in place.
This is not always a satisfactory arrangement for vehicle owners.
Alternate mounting locations, such as fenders or trunk lids, which may allow for different mounting techniquesl result in deterioration in the desired uniformity in the radiation pattern. It would be desirable, therefore to have an antenna which could operate at these UI~F frequencies and which at the same time could provide the desired operating characteristics without requiring the mounting arrangements that permanently mar a vehicle and require body repair when the antenna system is removed from the vehicle.
The mounting of a communications antenna on insulated surfaces such as the windshield of an automotive vehicle is known for much lower frequencies. One SUC}I an antenna system is disclosed in commonly assigned U.S. Patent No. 4,238,799 which issued on December 9, 1980.
The antenna system there specifically disclosed is particularly adapted for operation at frequencies well below the frequencies used for cellular phone communication systems. Thus, the antenna theTe disclosed was designed for operation in the CB and related bands of about 28-29 ,~lHz.
Antennas similar to and adapted from the antenna disclosed in the aforesaid U.S. Patent No. 4,238,799 have been designed and operate at some-what higher :frequencies than those disclosed in that patent. However, although the electrical schematic representation of the circuit remains the same as that shown in Fig. 4 of that patent, as frequencies increase and reach the frequencies utilized in cellular phone systems, those at and above the 800 MHz band, the structure utilized for lower frequencies is no longer appropriate.
Furthermore, the antenna disclosed in the aforesaid patent is a relatively narrow band antenna which does not operate satisfactorily over the wide frequency bands which are required for cellular phone systems.
Summary r~ ~_t~le Invention In accordance with the present invention, there is provided a communications antenna adapted to operate at and above the 800 MHz frequency band which is designed ~or mounting on an insulated surface such as the windshield of an automotive vehicle and which provides excellent efficiency and gain as well as the desirable band width to allow for efficient use at the cellular communications frequencies under consideration.
In accordance with the present invention, a veh;cle windo~, e.g., the windshield is utilized to efficiently couple RF energy to a two-element collinear radiator mounted on the external surface of ~;le windshield. In order to couple the RF energy between the antenna and a transceive~, a specially designed coupler configuration is mounted on the inner surface of the window in proximity to the antenna mount. The coupler reactively couples the radiator element to a transmission line wh;le providing the desired 50 ohm input impedence.
The coupler in accor(~ance wit'n the present invention together with the radiator designed for use therewith provides desired VSWR characteristics over the operating band ranges of 60 to 80 MHz such as contemplated for use in cellular telephone systems.
In accordance with the present invention, specially designed tuning circuit elements are utilized and are disposed in a conductive coupler box which acts as a counterpoise for the antenna radiator. The window mounted antenna incorporating the present invention is capable of providing radiation cllaracteristics comparable to antennas 3~
--d,--mounted on the roof tops of vehiclesg provides desired omni-directional coverage and satisfactory gain without the distortion which may arise from mounting antennas on trunk lids and other less satisfactory locations on a vehicle.
More specifically, the communications antenna system incorporating the present invention utilizes a collinear radiator having a 5/8 wave-length upper radiator and a lower radiator having an electrical length of between about 1/4 and 1/2 wave-length separated by an air-wound phasing coil.
One advantage of the glass mounted antenna system as set forth in the above-mentioned patent is the elimination of the ground plane and the resultant uniformity of radiation pattern independent of vehicle configuration.
At the frequencies at which the assembly incorporating the present invention is used~ however, one problem that arises is that the transmission line con-necting the antenna assembly to the transceiver becomes "hot".
In order to eliminate this problem, the coupling or feed assembly is incorporated in a conductive housing which acts as a counterpoise. Disposed within the conductive housing are the components defining a coupling capacitor plate, and the tuned circuit utilized to tune the antenna and couple the radiator mounted on the external surface of the glass to the transmission line.
The configuration of the components disposed within the coupling or feed housing are significantly different than those that were suitable for use in the antenna disclosed in the aforesaid patent. Thws, the coupling capacitor plate forming a part of the eed housing is a printed circuit foil embedded in a 3~
dielectric sheet forming one side of the housing.
The plate of the coupling capacitor also acts as the plate of the adjustable tuning capacitor The other plate of the tuning capacitor is a generally U-shaped member. The base of the U is affixed to and in contact with the metallic housing forming the counterpoise. One leg of the U shaped plate, oriented at substantially 90 to the base, provides the ground or shield connection to a transmission line connector. The second leg forms the other plate of the tuning capacitor. The second leg extends at an obtuse angle to the base of the U and has a free end bent back to form a return oriented generally parallel to the base thereof. The return portion extends over at least a portion of the coupling plate or embedded foil element to define the adjustable coupling capacitor.
The ad]ustment of the capacitor is achieved by adjusting the position of the free end return and thereby adjusting the amount of overlap between that plate of the tuning capacitor and the foil coupling plate. The dielectric member in which the coupling plate is embedded forms the closure for the conductive housing or counterpoise~
The inductor is defined by a straight wire having a dimension suitable to the frequencies at which the antenna is to be tuned. The wire extends between and is electrically connected to the base of the generally U-shaped conductor and the foil coupling plate. ~he center conductor of the transmission line connector is electrically connected to the inductor at an appropriate tap point along its length whereby the impedence of the tuning circuit is matched to the 50 ohm impedence of the transmission line.
3~
By utilizing a through-the-glass antenna assembly in accordance with the present invention, there is provided an antenna system capable of producing omni-directional radiation at and above the 800MHz band having a band width defined by a ~SWR
less than 1.5 over a range of about 60-80 MHz rendering the antenna suitable for use as a cellular phone system antenna providing desired gain and band width capabilities. At the same time, by use of the antenna system incorporating the present invention, the transmission line connecting the antenna to the transistor is not hot, thereby eliminating one safety concern.
Numerous other advantages and features of the present invention will become readily apparent from the following detailed description of the invention and the embodiments thereof, from the claims and from the accompanying drawings in which the details of the invention are fully and completely disclosed as a part of this specification.
Brief Description of the Drawings ~ _ _ _ _ Fig. 1 is a perspective view showing installation of an antenna on a windshield;
Fig. 2 is an enlarged cross~section taken along lines 2-2 of Fig. l;
Fig. 3 is a perspective view, partially broken away o~ a feed or coupling assembly in accordance with the present invention;
Fig. 4 is an elevation of the coupling housing;
Fig. 5 is an elevation showing a suitable antenna radiator; and Figs. 6 and 7 are ~SWR plots for the antenna incorporating the present invention.
33~
JL
Detalled Description of a Preferred ~mbodiment From the foregoing, it ~"ill be observed that numerous variations and modifications may be effected without departins from the true spirit and scope of the novel concept of the invention. It is to be understood that no limitation with respect to the specific apparatus illustrated herein is intended or should be inferred. It is, of course, intended to cover by the appended claims all such modifications as fall within the scope o~ the claims.
Referring to the drawings there is shown an antenna system incorporating the present invention.
The antenna system includes an elongated collinear radiator 10 comprising an upper section lOa having an electrical length of approximately 5/8 wavelength, and lower section lOb having an electrical length in excess of 1/4 wavelength separated by an air wound phasing coil lOc having a length suitable for proper phasing at the frequency at which the antenna is to be used.
The radiator terminates in a base or foot 12 such as one shown in U.S. Patent No. 4,266,227 having a generally flat member 12a adapted to be suitably affixed to the outer surface of a dielectric member such as a windshield 14 of a vehicle 16. The member 12a forms the first plate of a coupling capacitor. A
coupling or feed assembly 20 is affixed by a layer of adhesive 21 to the inner surface of the windshield 14 juxtaposed to the antenna base member 12.
The feed assembly 20 includes a conductive housing 22 having a front wall 24 and four side walls 26 with an open back 28. The conductive housing acts as a counterpoise for the antenna system and thereby results in the feed or transmission line between the antenna system and the transceiver remaining "cold".
3~
~L~
The open back 28 is closed by a dielectric circuit board 30 having formed therein a conductive foil plate 33 which defines the second plate of the coupling capacitor 34 on opposite sides of the windshield 14.
The inner coupling plate 33 also forms one plate oE an adjustable tuning capacitor 36. The other plate of capacitor 36 is defined by a generally U-shaped bent member 38 having a generally planar base portion 38a lying along and affixed to the inner surface of front wall 24 of the conductive housing ~2. A standard transmission line coaxial connector 42 is disposed in one side wall 26a of the housing 22~ The shield connection of the connector 42 is electrically connected to the housing 22 and to one leg 38b of the second tuning capacitor plate or U-shaped member 38 disposed generally perpendicular to the base 38a of the capacitor plate.
The other free leg 38c of the bent member 38 extends at a ~enerally obtuse angle from the base 38 with the free end bent back to form a return 38d which overlaps and is spaced from the foil coupling plate 33. Adjustment of the capacitor 36 is achieved by utilizing a non-conductive member 44 which passes through the side wall 26b and engages the free end or leg 38c of the tuning capacitor plate 38 to displace the leg 38c inwardly and outwardly, This adjusts the amount of overlap between the capacitor plate return 38d and the coupling plate 33 to adjust the amount of capacitance thereof as is well known.
An inductor 46 in the form of a straight wire having a diameter to produce an inductance appropriate to the frequency to which the system is to be tuned is electrically connected to the base 38a of the ad3ustable capacitor plate 38 and to the foil 33 formed in the PC board dielectric. The center ~33~
conductor 48 of the transmission line connector 42 is electrically connected to the inductor/wire 46 at a point between its ends to match the impedance of the transmission line itself of about 50 ohms.
A system so constructed is capable of providing significant band width over the desired range of at least about 60 to 80 M~Iz. For example, in one embodiment of the antenna system incorporating the present invention an antenna was tuned at 806 MHz and maintained a VSWR below 1.5 between frequencies of about 800 MHz and about 860 MHz as shown at A in Fig. 6. An antenna tuned to 820 M~z maintained VSWR
equal or less than 1.5 between a frequency of about 802 MHz to excess of 865 MHz as shown in B in Fig.
6. Another antenna that was designed for use in the 821 896 MHz band maintained a VSWR at or below 1.5 between the frequencies of 820 MHz and 895 MHz, as shown in Fig. 7.
Such an antenna system was able to provide a uniform radiation pattern as a function of radiation angle with a uniformity substantially similar to a roof mounted antenna and substantially better than trunk and cowl mounted antennas. Such uniformity is especially important for cellular phone type systems since communications using such systems occur in all directions and any reduction of gain in any particular direction would adversely affect the quality and ability of the mobile system to maintain colTununications.
Thus there has been dislcosed a mobil communications antenna system capable of use in the 800 MEIz frequency band and above which does not require affixing to the metallic or conductive surface of a vehicle with the resulting damage thereto, which provides desired uniformity of transmission as a function of horizontal angle which provides satisfactory gain in all direction and which eliminates any concern or problem of having a hot cable disposed within the passenger compartment of such vehicles.
While this invention is susceptible of embodiment in many different forms, there is shown in the drawing and will be described herein in detail a specific embodiment thereof with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the invention to the specific embodiment illustrated.
CELLULAR MOBILE COMMUNICATIONS ANTENNA
Field of the Invention -The present invention relates to communications antennas and more particularly to mobile communications antennas for frequencies in the area of the 800MHz frequency band of the type adapted to be mounted on a non-conductive surface such as a vehicle windshield.
Background of the Invention The recent introduction of cellular telephone service which utilize frequencies in ~he 800MHz frequency band and above, has increased interest in the efficient mobile antenna systems for those frequencies. Such services typically utilize a fairly wide band width. For example, existing and/or proposed systems operate over frequency bands oE
about 800-870 MHz, 820-900 MHz and 860-840 MHz. As can be seen by the above figures, the band width of such operating systems ranges from between about 60 to about 80 MHz. Thus, any antenna designed for use with such systems should provide efficient radiation characteristics and low VSWR over these band widths.
In addition, mobile antennas for such communications systems are designed to be mounted on vehicles. Some type of permanent installation is often necessary. For preferred locations, those which provide the most uniform radiation patterns, such as roof tops, this requires mounting to the vehicle such as automobiles by cutting holes into the body and permanently mounting the antennas in place.
This is not always a satisfactory arrangement for vehicle owners.
Alternate mounting locations, such as fenders or trunk lids, which may allow for different mounting techniquesl result in deterioration in the desired uniformity in the radiation pattern. It would be desirable, therefore to have an antenna which could operate at these UI~F frequencies and which at the same time could provide the desired operating characteristics without requiring the mounting arrangements that permanently mar a vehicle and require body repair when the antenna system is removed from the vehicle.
The mounting of a communications antenna on insulated surfaces such as the windshield of an automotive vehicle is known for much lower frequencies. One SUC}I an antenna system is disclosed in commonly assigned U.S. Patent No. 4,238,799 which issued on December 9, 1980.
The antenna system there specifically disclosed is particularly adapted for operation at frequencies well below the frequencies used for cellular phone communication systems. Thus, the antenna theTe disclosed was designed for operation in the CB and related bands of about 28-29 ,~lHz.
Antennas similar to and adapted from the antenna disclosed in the aforesaid U.S. Patent No. 4,238,799 have been designed and operate at some-what higher :frequencies than those disclosed in that patent. However, although the electrical schematic representation of the circuit remains the same as that shown in Fig. 4 of that patent, as frequencies increase and reach the frequencies utilized in cellular phone systems, those at and above the 800 MHz band, the structure utilized for lower frequencies is no longer appropriate.
Furthermore, the antenna disclosed in the aforesaid patent is a relatively narrow band antenna which does not operate satisfactorily over the wide frequency bands which are required for cellular phone systems.
Summary r~ ~_t~le Invention In accordance with the present invention, there is provided a communications antenna adapted to operate at and above the 800 MHz frequency band which is designed ~or mounting on an insulated surface such as the windshield of an automotive vehicle and which provides excellent efficiency and gain as well as the desirable band width to allow for efficient use at the cellular communications frequencies under consideration.
In accordance with the present invention, a veh;cle windo~, e.g., the windshield is utilized to efficiently couple RF energy to a two-element collinear radiator mounted on the external surface of ~;le windshield. In order to couple the RF energy between the antenna and a transceive~, a specially designed coupler configuration is mounted on the inner surface of the window in proximity to the antenna mount. The coupler reactively couples the radiator element to a transmission line wh;le providing the desired 50 ohm input impedence.
The coupler in accor(~ance wit'n the present invention together with the radiator designed for use therewith provides desired VSWR characteristics over the operating band ranges of 60 to 80 MHz such as contemplated for use in cellular telephone systems.
In accordance with the present invention, specially designed tuning circuit elements are utilized and are disposed in a conductive coupler box which acts as a counterpoise for the antenna radiator. The window mounted antenna incorporating the present invention is capable of providing radiation cllaracteristics comparable to antennas 3~
--d,--mounted on the roof tops of vehiclesg provides desired omni-directional coverage and satisfactory gain without the distortion which may arise from mounting antennas on trunk lids and other less satisfactory locations on a vehicle.
More specifically, the communications antenna system incorporating the present invention utilizes a collinear radiator having a 5/8 wave-length upper radiator and a lower radiator having an electrical length of between about 1/4 and 1/2 wave-length separated by an air-wound phasing coil.
One advantage of the glass mounted antenna system as set forth in the above-mentioned patent is the elimination of the ground plane and the resultant uniformity of radiation pattern independent of vehicle configuration.
At the frequencies at which the assembly incorporating the present invention is used~ however, one problem that arises is that the transmission line con-necting the antenna assembly to the transceiver becomes "hot".
In order to eliminate this problem, the coupling or feed assembly is incorporated in a conductive housing which acts as a counterpoise. Disposed within the conductive housing are the components defining a coupling capacitor plate, and the tuned circuit utilized to tune the antenna and couple the radiator mounted on the external surface of the glass to the transmission line.
The configuration of the components disposed within the coupling or feed housing are significantly different than those that were suitable for use in the antenna disclosed in the aforesaid patent. Thws, the coupling capacitor plate forming a part of the eed housing is a printed circuit foil embedded in a 3~
dielectric sheet forming one side of the housing.
The plate of the coupling capacitor also acts as the plate of the adjustable tuning capacitor The other plate of the tuning capacitor is a generally U-shaped member. The base of the U is affixed to and in contact with the metallic housing forming the counterpoise. One leg of the U shaped plate, oriented at substantially 90 to the base, provides the ground or shield connection to a transmission line connector. The second leg forms the other plate of the tuning capacitor. The second leg extends at an obtuse angle to the base of the U and has a free end bent back to form a return oriented generally parallel to the base thereof. The return portion extends over at least a portion of the coupling plate or embedded foil element to define the adjustable coupling capacitor.
The ad]ustment of the capacitor is achieved by adjusting the position of the free end return and thereby adjusting the amount of overlap between that plate of the tuning capacitor and the foil coupling plate. The dielectric member in which the coupling plate is embedded forms the closure for the conductive housing or counterpoise~
The inductor is defined by a straight wire having a dimension suitable to the frequencies at which the antenna is to be tuned. The wire extends between and is electrically connected to the base of the generally U-shaped conductor and the foil coupling plate. ~he center conductor of the transmission line connector is electrically connected to the inductor at an appropriate tap point along its length whereby the impedence of the tuning circuit is matched to the 50 ohm impedence of the transmission line.
3~
By utilizing a through-the-glass antenna assembly in accordance with the present invention, there is provided an antenna system capable of producing omni-directional radiation at and above the 800MHz band having a band width defined by a ~SWR
less than 1.5 over a range of about 60-80 MHz rendering the antenna suitable for use as a cellular phone system antenna providing desired gain and band width capabilities. At the same time, by use of the antenna system incorporating the present invention, the transmission line connecting the antenna to the transistor is not hot, thereby eliminating one safety concern.
Numerous other advantages and features of the present invention will become readily apparent from the following detailed description of the invention and the embodiments thereof, from the claims and from the accompanying drawings in which the details of the invention are fully and completely disclosed as a part of this specification.
Brief Description of the Drawings ~ _ _ _ _ Fig. 1 is a perspective view showing installation of an antenna on a windshield;
Fig. 2 is an enlarged cross~section taken along lines 2-2 of Fig. l;
Fig. 3 is a perspective view, partially broken away o~ a feed or coupling assembly in accordance with the present invention;
Fig. 4 is an elevation of the coupling housing;
Fig. 5 is an elevation showing a suitable antenna radiator; and Figs. 6 and 7 are ~SWR plots for the antenna incorporating the present invention.
33~
JL
Detalled Description of a Preferred ~mbodiment From the foregoing, it ~"ill be observed that numerous variations and modifications may be effected without departins from the true spirit and scope of the novel concept of the invention. It is to be understood that no limitation with respect to the specific apparatus illustrated herein is intended or should be inferred. It is, of course, intended to cover by the appended claims all such modifications as fall within the scope o~ the claims.
Referring to the drawings there is shown an antenna system incorporating the present invention.
The antenna system includes an elongated collinear radiator 10 comprising an upper section lOa having an electrical length of approximately 5/8 wavelength, and lower section lOb having an electrical length in excess of 1/4 wavelength separated by an air wound phasing coil lOc having a length suitable for proper phasing at the frequency at which the antenna is to be used.
The radiator terminates in a base or foot 12 such as one shown in U.S. Patent No. 4,266,227 having a generally flat member 12a adapted to be suitably affixed to the outer surface of a dielectric member such as a windshield 14 of a vehicle 16. The member 12a forms the first plate of a coupling capacitor. A
coupling or feed assembly 20 is affixed by a layer of adhesive 21 to the inner surface of the windshield 14 juxtaposed to the antenna base member 12.
The feed assembly 20 includes a conductive housing 22 having a front wall 24 and four side walls 26 with an open back 28. The conductive housing acts as a counterpoise for the antenna system and thereby results in the feed or transmission line between the antenna system and the transceiver remaining "cold".
3~
~L~
The open back 28 is closed by a dielectric circuit board 30 having formed therein a conductive foil plate 33 which defines the second plate of the coupling capacitor 34 on opposite sides of the windshield 14.
The inner coupling plate 33 also forms one plate oE an adjustable tuning capacitor 36. The other plate of capacitor 36 is defined by a generally U-shaped bent member 38 having a generally planar base portion 38a lying along and affixed to the inner surface of front wall 24 of the conductive housing ~2. A standard transmission line coaxial connector 42 is disposed in one side wall 26a of the housing 22~ The shield connection of the connector 42 is electrically connected to the housing 22 and to one leg 38b of the second tuning capacitor plate or U-shaped member 38 disposed generally perpendicular to the base 38a of the capacitor plate.
The other free leg 38c of the bent member 38 extends at a ~enerally obtuse angle from the base 38 with the free end bent back to form a return 38d which overlaps and is spaced from the foil coupling plate 33. Adjustment of the capacitor 36 is achieved by utilizing a non-conductive member 44 which passes through the side wall 26b and engages the free end or leg 38c of the tuning capacitor plate 38 to displace the leg 38c inwardly and outwardly, This adjusts the amount of overlap between the capacitor plate return 38d and the coupling plate 33 to adjust the amount of capacitance thereof as is well known.
An inductor 46 in the form of a straight wire having a diameter to produce an inductance appropriate to the frequency to which the system is to be tuned is electrically connected to the base 38a of the ad3ustable capacitor plate 38 and to the foil 33 formed in the PC board dielectric. The center ~33~
conductor 48 of the transmission line connector 42 is electrically connected to the inductor/wire 46 at a point between its ends to match the impedance of the transmission line itself of about 50 ohms.
A system so constructed is capable of providing significant band width over the desired range of at least about 60 to 80 M~Iz. For example, in one embodiment of the antenna system incorporating the present invention an antenna was tuned at 806 MHz and maintained a VSWR below 1.5 between frequencies of about 800 MHz and about 860 MHz as shown at A in Fig. 6. An antenna tuned to 820 M~z maintained VSWR
equal or less than 1.5 between a frequency of about 802 MHz to excess of 865 MHz as shown in B in Fig.
6. Another antenna that was designed for use in the 821 896 MHz band maintained a VSWR at or below 1.5 between the frequencies of 820 MHz and 895 MHz, as shown in Fig. 7.
Such an antenna system was able to provide a uniform radiation pattern as a function of radiation angle with a uniformity substantially similar to a roof mounted antenna and substantially better than trunk and cowl mounted antennas. Such uniformity is especially important for cellular phone type systems since communications using such systems occur in all directions and any reduction of gain in any particular direction would adversely affect the quality and ability of the mobile system to maintain colTununications.
Thus there has been dislcosed a mobil communications antenna system capable of use in the 800 MEIz frequency band and above which does not require affixing to the metallic or conductive surface of a vehicle with the resulting damage thereto, which provides desired uniformity of transmission as a function of horizontal angle which provides satisfactory gain in all direction and which eliminates any concern or problem of having a hot cable disposed within the passenger compartment of such vehicles.
While this invention is susceptible of embodiment in many different forms, there is shown in the drawing and will be described herein in detail a specific embodiment thereof with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the invention to the specific embodiment illustrated.
Claims (50)
EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE
DEFINED AS FOLLOWS:
1. A mobile communications antenna system for use at UHF frequencies at least as high as 800 MHz comprising:
an elongated radiating member attached at one end to a conductive base member affixed to the outer surface of a non-conductive dielectric member of a vehicle; and a coupling system disposed on the inner surface of said dielectric member and juxtaposed with said base member, said coupling system including a conductive housing defining a counterpoise for said antenna system and a coupling plate member juxtaposed with said base member to define therewith a coupling capacitor for RF energy, said coupling plate member being electrically insulated from said conductive counterpoise housing, a tuned circuit connected to said coupling capacitor and disposed within said conductive counterpoise housing for tuning said antenna system to a desired frequency within said 800 MHz band, and a connector member for a coaxial transmission line electrically connected to said tuned circuit at a point at which the impedance of the transmission line connected to said connector member and said tuned circuit are substantially the same.
an elongated radiating member attached at one end to a conductive base member affixed to the outer surface of a non-conductive dielectric member of a vehicle; and a coupling system disposed on the inner surface of said dielectric member and juxtaposed with said base member, said coupling system including a conductive housing defining a counterpoise for said antenna system and a coupling plate member juxtaposed with said base member to define therewith a coupling capacitor for RF energy, said coupling plate member being electrically insulated from said conductive counterpoise housing, a tuned circuit connected to said coupling capacitor and disposed within said conductive counterpoise housing for tuning said antenna system to a desired frequency within said 800 MHz band, and a connector member for a coaxial transmission line electrically connected to said tuned circuit at a point at which the impedance of the transmission line connected to said connector member and said tuned circuit are substantially the same.
2. An antenna system as claimed in claim 1 wherein said coupling plate member is a printed circuit foil formed in a non-conductive closing member closing one side of said conductive counterpoise housing; and including means for affixing said non-conductive closing member to the inner surface of said vehicle dielectric member with the printed circuit foil generally juxtaposed with said base member.
3. An antenna system as claimed in claim 2 wherein said tuned circuit comprises an adjustable tuning capacitor and an inductor connected in parallel therewith, said printed circuit foil coupling plate being one plate of said tuning capacitor, and the other plate comprising a generally U-shaped conductive member having a base portion disposed between and connected to first and second legs, said base portion being affixed to a conductive wall of said housing, said first leg being connected to said connector and said second leg being adjustable and having a free end portion juxtaposed and spaced from said foil coupling plate.
4. An antenna system as claimed in claim 3 including means for adjusting the degree of juxtaposition between the plates of said tuning capacitor.
5. An antenna system as claimed in claim 4 wherein said inductor is a straight wire extending between and connected to said printed circuit foil coupling plate and said base of said U-shaped member.
6. An antenna system as claimed in claim 5 wherein said connector is a coaxial connector having a shield contact connected to said first leg of said U-shaped member and to said conductive counterpoise housing and a center connector connected to said inductor wire.
7. An antenna system as claimed in claim 6 wherein said radiator is a collinear radiator having a first portion having a length about equal to 5/8 wavelength, a second portion including said base member having a length between about 1/4 and 1/2 wavelength, and a phasing coil therebetween.
8. A mobile communications antenna system usable to radiate radio frequency energy generated by a transceiver located in a vehicle at frequencies in excess of 800 MHz and attachable to a dielectric member of the vehicle comprising:
an elongated radiating member attached at one end to a conductive base member, said base member being attachable to a first surface of the dielectric member of the vehicle;
a conductive housing having an open backwall and defining a cavity therein; a non-conductive closing member closing the open back of the conductive housing;
means, attachable to a second surface of the dielectric member adjacent said base member, for coupling radio frequency energy with frequencies in excess of 800MHZ to said radiating member, said coupling means being affixed to said non-conductive member of said housing;
a coaxial connector with first and second conductors, said first connector conductor being electrically coupled to said housing;
a selectively tunable circuit positioned in said cavity and electrically connected between said coupling means and said second connector conductor;
and a coaxial cable having first and second conductors and connectable between said connector and the transceiver with said first connector conductor electrically engaging said first cable conductor and said first cable conductor electrically engaging a selected conductor of the transceiver so as to form only a single conductive path between said housing and the selected conductor in the transceiver.
an elongated radiating member attached at one end to a conductive base member, said base member being attachable to a first surface of the dielectric member of the vehicle;
a conductive housing having an open backwall and defining a cavity therein; a non-conductive closing member closing the open back of the conductive housing;
means, attachable to a second surface of the dielectric member adjacent said base member, for coupling radio frequency energy with frequencies in excess of 800MHZ to said radiating member, said coupling means being affixed to said non-conductive member of said housing;
a coaxial connector with first and second conductors, said first connector conductor being electrically coupled to said housing;
a selectively tunable circuit positioned in said cavity and electrically connected between said coupling means and said second connector conductor;
and a coaxial cable having first and second conductors and connectable between said connector and the transceiver with said first connector conductor electrically engaging said first cable conductor and said first cable conductor electrically engaging a selected conductor of the transceiver so as to form only a single conductive path between said housing and the selected conductor in the transceiver.
9. The antenna system of claim 8 wherein said selectively tunable circuit includes means for matching the impedance of said coaxial cable.
10. The antenna system of claim 9 wherein said impedance matching means includes an inductor coupled between said housing and said coupling means.
11. The antenna system of claim 10 wherein said inductor is a straight wire having first and second ends coupled respectively to said housing and said coupling means.
12. The antenna system of claim 11 with said second connector conductor coupled to a selected point between said ends.
13. The antenna system of claim 8 with said conductive housing being a counterpoise for said radiating member.
14. A mobile communications antenna system usable to radiate radio frequency energy generated by a transceiver located in a vehicle at frequencies in excess of 800 MHz and attachable to a dielectric member of the vehicle comprising:
an elongated radiating member attached at one end to a supporting member, said radiating member being supportable adjacent the dielectric member of the vehicle; and a coupling system affixable to the dielectric member, juxtaposed with said supporting member, said coupling system including, conductive means defining a counterpoise for said antenna system, means, spaced from said counterpoise, for coupling radio frequency energy in excess of 800 MHz through the dielectric member to said radiating member, connector means having first and second conductors with said first conductor coupled to said counterpoise, and means for electrically coupling said coupling means to said second conductor.
an elongated radiating member attached at one end to a supporting member, said radiating member being supportable adjacent the dielectric member of the vehicle; and a coupling system affixable to the dielectric member, juxtaposed with said supporting member, said coupling system including, conductive means defining a counterpoise for said antenna system, means, spaced from said counterpoise, for coupling radio frequency energy in excess of 800 MHz through the dielectric member to said radiating member, connector means having first and second conductors with said first conductor coupled to said counterpoise, and means for electrically coupling said coupling means to said second conductor.
15. An antenna system in accordance with claim 14 with said connector means engageable with the transceiver and with said conductive means being electrically coupled by only said first conductor of said connector means to a selected conductor in the transceiver.
16. An antenna system in accordance with claim 14 wherein:
said supporting member includes a conductive base member affixable to a surface of the dielectric member.
said supporting member includes a conductive base member affixable to a surface of the dielectric member.
17. An antenna system in accordance with claim 16 wherein said base member is afixable to one surface of the dielectric member and the coupling system is affixable to a second surface of said dielectric member.
18. An antenna system in accordance with claim 17 wherein said coupling means includes a planar metal member positionable on the second surface, juxtaposed with said base member, thereby forming a coupling capacitor.
19. An antenna system in accordance with claim 18 wherein said conductive means includes a shaped metal member at least a portion of which is positionable against the second surface of the dielectric member.
20. An antenna system in accordance with claim 19 wherein said shaped metal member is a conductive housing.
21. An antenna system in accordance with claim 19 wherein said electrically connecting means includes a conducting member coupled between said planar metal member and said second conductor.
22. An antenna system in accordance with claim 19 wherein said electrically connecting means includes an impedance-matching circuit.
23. An antenna system in accordance with claim 19 wherein said electrically connecting means includes a tunable circuit.
24. An antenna system in accordance with claim 19 wherein said connector means includes a coaxial connector one conductor of which is electrically coupled to said shaped metal member and a second conductor of which is electrically coupled to said planar metal member.
25. An antenna system in accordance with claim 19 wherein said connector means includes a cable having first and second conductors couplable to the transceiver with said shaped metal member coupled to a selected electrical connection in the transceiver only by a selected one of said conductors in said cable.
26. A mobile communications antenna system usable to radiate radio frequency energy generated by a transceiver located in a vehicle at frequencies in excess of 800 MHz and attachable to a dielectric member of the vehicle comprising:
an elongated radiating member attached at one end to a supporting member, said radiating member being supportable adjacent the dielectric member of the vehicle; and a coupling system affixable to the dielectric member, juxtaposed with said supporting member, said coupling system including, conductive means including a shaped metal member at least a portion of which is positionable adjacent the dielectric member, said shaped metal member defining a counterpoise for said antenna system, means, spaced from said counterpoise, for coupling radio frequency energy in excess of 800 MHz through the dielectric member to said radiating member, connector means having first and second conductors with said first conductor coupled to said counterpoise, and means for electrically coupling said coupling means to said second conductor.
an elongated radiating member attached at one end to a supporting member, said radiating member being supportable adjacent the dielectric member of the vehicle; and a coupling system affixable to the dielectric member, juxtaposed with said supporting member, said coupling system including, conductive means including a shaped metal member at least a portion of which is positionable adjacent the dielectric member, said shaped metal member defining a counterpoise for said antenna system, means, spaced from said counterpoise, for coupling radio frequency energy in excess of 800 MHz through the dielectric member to said radiating member, connector means having first and second conductors with said first conductor coupled to said counterpoise, and means for electrically coupling said coupling means to said second conductor.
27. An antenna system in accordance with claim 26 wherein said shaped metal member is a conductive housing.
28. An antenna system in accordance with claim 27 with said connector means engageable with the transceiver with said conductive means being electrically coupled by only said first conductor of said connector means to a selected conductor in the transceiver.
29. An antenna system in accordance with claim 27 wherein:
said supporting member includes a conductive base member with said base member being affixable to a surface of the dielectric member.
said supporting member includes a conductive base member with said base member being affixable to a surface of the dielectric member.
30. An antenna system in accordance with claim 29 wherein said base member is afixable to one surface of the dielectric member and the coupling system is affixable to a second surface of said dielectric member.
31. An antenna system in accordance with claim 30 wherein said coupling means includes a planar metal member positionable on the second surface, juxtaposed with said base member, thereby forming a coupling capacitor.
32. An antenna system in accordance with claim 31 wherein said electrically connecting means includes a conducting member coupled between said planar metal member and said second conductor.
33. An antenna system in accordance with claim 31 wherein said electrically connecting means includes an impedance-matching circuit.
34. An antenna system in accordance with claim 31 wherein said electrically connecting means includes a tunable circuit.
35. An antenna system in accordance with claim 31 wherein said connector means includes a coaxial connector one conductor of which is electrically coupled to said conductive housing and a second conductor of which is electrically coupled to said planar metal member.
36. An antenna system in accordance with claim 31 wherein said connector means includes a cable having first and second conductors couplable to the transceiver with said conductive housing coupled to a selected electrical connection in the transceiver only by a selected one of said conductors in said cable.
37. A mobile communications antenna system usable to radiate radio frequency energy generated by a transceiver located in a vehicle at frequencies in excess of 800 MHz and attachable to a dielectric member of the vehicle comprising:
an elongated radiating member attached at one end to a supporting member, said radiating member being supportable adjacent the dielectric member of the vehicle; and a coupling system affixable to the dielectric member, juxtaposed with said supporting member, said coupling system including, conductive means defining a counterpoise for said antenna system, means, spaced from said counterpoise, for coupling radio frequency energy in excess of 800 MHz through the dielectric member to said radiating member, connector means having first and second conductors with said first conductor coupled to said counterpoise, and tunable circuit means for electrically coupling said coupling means to said second conductor.
an elongated radiating member attached at one end to a supporting member, said radiating member being supportable adjacent the dielectric member of the vehicle; and a coupling system affixable to the dielectric member, juxtaposed with said supporting member, said coupling system including, conductive means defining a counterpoise for said antenna system, means, spaced from said counterpoise, for coupling radio frequency energy in excess of 800 MHz through the dielectric member to said radiating member, connector means having first and second conductors with said first conductor coupled to said counterpoise, and tunable circuit means for electrically coupling said coupling means to said second conductor.
38. An antenna system in accordance with claim 37 with said connector means engageable with the transceiver with said conductive means being electrically coupled by only said first conductor of said connector means to a selected conductor in the transceiver.
39. An antenna system in accordance with claim 37 wherein:
said supporting member includes a conductive base member with said base member being affixable to a surface of the dielectric member.
said supporting member includes a conductive base member with said base member being affixable to a surface of the dielectric member.
40. An antenna system in accordance with claim 39 wherein said base member is afixable to one surface of the dielectric member and the coupling system is affixable to a second surface of said dielectric member.
41. An antenna system in accordance with claim 40 wherein said coupling means includes a planar metal member positionable on the second surface, juxtaposed with said base member, thereby forming a coupling capacitor.
42. An antenna system in accordance with claim 41 wherein said conductive means includes a shaped metal member at least a portion of which is positionable against the second surface of the dielectric member.
43. An antenna system in accordance with claim 42 wherein said shaped metal member is a conductive housing.
44. An antenna system in accordance with claim 42 wherein said tunable circuit means includes an impedance-matching circuit.
45. An antenna system in accordance with claim 44 wherein said impedance matching circuit includes an inductive element.
46. An antenna system in accordance with claim 42 wherein said connector means includes a coaxial connector one conductor of which is electrically coupled to said shaped metal member and a second conductor of which is electrically coupled to said planar metal member.
47. An antenna system in accordance with claim 42 wherein said connector means includes a cable having first and second conductors couplable to the transceiver with said shaped metal member coupled to a selected electrical connection in the transceiver only by a selected one of said conductors in said cable.
48. A mobile communications antenna system attachable to a dielectric member on a vehicle and usable to radiate radio frequency energy generated by a transceiver located in the vehicle at frequencies at least as high as 800 MHz comprising:
a radiating member and attached means for supporting said radiating member adjacent the dielectric member;
a coupling system affixable to the dielectric member of the vehicle including, conductive means defining a counterpoise for the antenna system and means for coupling radio frequency energy through the dielectric member to said radiating member; and connector means having first and second conductors with said first conductor electrically coupled to said counterpoise and with said second conductor electrically coupled to said coupling means, said connector means engageable with the transceiver with said counterpoise being electrically coupled by only said first conductor to a selected conductor in the transceiver.
a radiating member and attached means for supporting said radiating member adjacent the dielectric member;
a coupling system affixable to the dielectric member of the vehicle including, conductive means defining a counterpoise for the antenna system and means for coupling radio frequency energy through the dielectric member to said radiating member; and connector means having first and second conductors with said first conductor electrically coupled to said counterpoise and with said second conductor electrically coupled to said coupling means, said connector means engageable with the transceiver with said counterpoise being electrically coupled by only said first conductor to a selected conductor in the transceiver.
49. A mobile communications antenna system attachable to a dielectric member on a vehicle and usable to radiate radio frequency energy generated by a transceiver located in the vehicle at frequencies at least as high as 800 MHz comprising:
a radiating member and attached means for supporting said radiating member adjacent the dielectric member;
a coupling system affixable to the dielectric member of the vehicle including, a conductive housing defining a counterpoise for the antenna system; and means for coupling radio frequency energy through the dielectric member, to said radiating member with said coupling means including impedance matching means.
a radiating member and attached means for supporting said radiating member adjacent the dielectric member;
a coupling system affixable to the dielectric member of the vehicle including, a conductive housing defining a counterpoise for the antenna system; and means for coupling radio frequency energy through the dielectric member, to said radiating member with said coupling means including impedance matching means.
50. A mobile communications antenna system as in claim 49 wherein said impedance matching means incorporates tuned circuit means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US53527383A | 1983-09-23 | 1983-09-23 | |
| US535,273 | 1990-06-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1223339A true CA1223339A (en) | 1987-06-23 |
Family
ID=24133532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000459443A Expired CA1223339A (en) | 1983-09-23 | 1984-07-23 | Cellular mobile communications antenna |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0137391B1 (en) |
| JP (1) | JPS6077501A (en) |
| AT (1) | ATE88837T1 (en) |
| CA (1) | CA1223339A (en) |
| DE (1) | DE3486135T2 (en) |
| NZ (1) | NZ209019A (en) |
| ZA (1) | ZA845849B (en) |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4658259A (en) * | 1985-03-06 | 1987-04-14 | Blaese Herbert R | On-glass antenna |
| USRE33743E (en) * | 1985-03-06 | 1991-11-12 | On-glass antenna | |
| US4794319A (en) * | 1986-07-03 | 1988-12-27 | Alliance Research Corporation | Glass mounted antenna |
| US4779098A (en) * | 1987-01-22 | 1988-10-18 | Blaese Herbert R | Modified on-glass antenna with decoupling members |
| US4785305A (en) * | 1987-04-20 | 1988-11-15 | Don Shyu | Glass-mountable antenna assembly with microstrip filter |
| KR900006537B1 (en) * | 1987-10-19 | 1990-09-07 | 태림전자 주식회사 | Antenna assembly for car-phone |
| US4931805A (en) * | 1988-05-16 | 1990-06-05 | The Antenna Company | Adhesive system and method for mounting a cellular telephone antenna |
| US4931806A (en) * | 1988-05-16 | 1990-06-05 | The Antenna Company | Window mounted antenna for a cellular mobile telephone |
| US4857939A (en) * | 1988-06-03 | 1989-08-15 | Alliance Research Corporation | Mobile communications antenna |
| GB8821171D0 (en) * | 1988-09-09 | 1988-10-12 | Bantex Ltd | Antenna |
| US4992800A (en) * | 1989-01-23 | 1991-02-12 | Martino Research & Development Co. | Windshield mounted antenna assembly |
| SE463285B (en) * | 1989-03-17 | 1990-10-29 | Allgon Ab | RADIO ANTEN FOR CAR |
| US4916456A (en) * | 1989-05-12 | 1990-04-10 | Don Shyu | Glass-mountable antenna assembly |
| US5262795A (en) * | 1990-01-30 | 1993-11-16 | Cellular Ic, Inc. | Unitary cellular antenna system |
| GB9007979D0 (en) * | 1990-04-09 | 1990-06-06 | Panorama Antennas Ltd | Matching element for mobile antenna |
| GB2250637A (en) * | 1990-12-05 | 1992-06-10 | Leslie James Wallen | Isolated antenna bases |
| JPH0553312U (en) * | 1991-12-17 | 1993-07-13 | コメット株式会社 | Mobile communication antenna device |
| US5463405A (en) * | 1994-05-20 | 1995-10-31 | Valor Enterprises, Inc. | Cellular telephone coupling network |
| DE4443596B4 (en) * | 1994-12-07 | 2004-12-16 | Heinz Prof. Dr.-Ing. Lindenmeier | Radio antenna on the window pane of a motor vehicle |
| SE9600321D0 (en) | 1996-01-30 | 1996-01-30 | Bjoern Heed | Antenna |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL153036B (en) * | 1970-07-17 | 1977-04-15 | Philips Nv | ANTENNA JACKING BOX AND PROCEDURE FOR MANUFACTURING THEREOF. |
| DE2257352A1 (en) * | 1972-11-22 | 1974-05-30 | Kathrein Werke Kg | VEHICLE ANTENNA |
| US3823402A (en) * | 1972-12-12 | 1974-07-09 | Westinghouse Electric Corp | Antenna deployed from aircraft to contact a body of water for length reduction |
| FR2287116A1 (en) * | 1974-10-04 | 1976-04-30 | Laurent Philippe | IMPROVEMENTS TO RADIO ANTENNAS |
| US4089817A (en) * | 1976-10-12 | 1978-05-16 | Stephen A. Denmar | Antenna system |
| US4238799A (en) * | 1978-03-27 | 1980-12-09 | Avanti Research & Development, Inc. | Windshield mounted half-wave communications antenna assembly |
| JPS55102206U (en) * | 1979-01-09 | 1980-07-16 | ||
| JPS6036889Y2 (en) * | 1979-03-28 | 1985-11-01 | 株式会社ヨコオ | antenna device |
| US4266227A (en) * | 1979-08-20 | 1981-05-05 | Avanti Research & Development, Inc. | Mounting for mobile communications antenna |
-
1984
- 1984-07-23 CA CA000459443A patent/CA1223339A/en not_active Expired
- 1984-07-26 NZ NZ209019A patent/NZ209019A/en unknown
- 1984-07-27 ZA ZA845849A patent/ZA845849B/en unknown
- 1984-09-05 JP JP59184746A patent/JPS6077501A/en active Granted
- 1984-09-21 AT AT84111340T patent/ATE88837T1/en not_active IP Right Cessation
- 1984-09-21 EP EP84111340A patent/EP0137391B1/en not_active Expired - Lifetime
- 1984-09-21 DE DE8484111340T patent/DE3486135T2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| AU3192484A (en) | 1985-03-28 |
| ATE88837T1 (en) | 1993-05-15 |
| JPH0374846B2 (en) | 1991-11-28 |
| DE3486135D1 (en) | 1993-06-03 |
| EP0137391A1 (en) | 1985-04-17 |
| EP0137391B1 (en) | 1993-04-28 |
| NZ209019A (en) | 1988-04-29 |
| AU577539B2 (en) | 1988-09-29 |
| DE3486135T2 (en) | 1993-09-16 |
| ZA845849B (en) | 1985-03-27 |
| JPS6077501A (en) | 1985-05-02 |
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Legal Events
| Date | Code | Title | Description |
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| MKEX | Expiry |