CA1070824A - Apparatus for transmitting high frequency signals - Google Patents
Apparatus for transmitting high frequency signalsInfo
- Publication number
- CA1070824A CA1070824A CA247,820A CA247820A CA1070824A CA 1070824 A CA1070824 A CA 1070824A CA 247820 A CA247820 A CA 247820A CA 1070824 A CA1070824 A CA 1070824A
- Authority
- CA
- Canada
- Prior art keywords
- high frequency
- frequency signals
- cable
- transmitting high
- signals according
- 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
Landscapes
- Waveguides (AREA)
Abstract
APPARATUS FOR TRANSMITTING
HIGH FREQUENCY SIGNALS
Abstract of the Disclosure In accordance with the teachings of the present invention apparatus for permitting interference free transmission of high frequency signals in any given frequency range is provided. In the inventive apparatus, a central conductor of a coaxially disposed pair of conductors is employed to radiate high frequency signal information and the coaxially disposed pair of conductors is mounted in a parallel manner to the path of a tracked vehicle on a support. The support includes a metallic member disposed along the entire length of the coaxially disposed pair of conductors which is periodically connected to the outer conductor of the coaxially disposed pair of conductors to substantially reduce field strength fluctuations through a suppression of induced secondary waves in the immediate proximity of said central conductor.
HIGH FREQUENCY SIGNALS
Abstract of the Disclosure In accordance with the teachings of the present invention apparatus for permitting interference free transmission of high frequency signals in any given frequency range is provided. In the inventive apparatus, a central conductor of a coaxially disposed pair of conductors is employed to radiate high frequency signal information and the coaxially disposed pair of conductors is mounted in a parallel manner to the path of a tracked vehicle on a support. The support includes a metallic member disposed along the entire length of the coaxially disposed pair of conductors which is periodically connected to the outer conductor of the coaxially disposed pair of conductors to substantially reduce field strength fluctuations through a suppression of induced secondary waves in the immediate proximity of said central conductor.
Description
~0708Z4 This invention relates to apparatus for transmitting high frequency signals between stationary equipment and a moving vehicle traveling upon a predetermined path and more particularly to transmitting apparatus of the foregoing kind which exhibits relatively uniform field strength characteristics and enhanced transmission qualities through the suppression of interfering reflections, standing waves and the like.
High frequency signal transmission apparatus employed with track bound vehicles and particularly that relied upon for tele~sion transmission thereto generally takes the form of a radiating central conductor disposed in a parallel relationship to the track which is scanned by antenna mounted on the track bound vehicle. The radiating central conductor generally takes the form of the inner conductor of a coaxially mounted pair having dielectric material interposed between the radiating central conductor and the outer conductor employed for the purposes of shielding and the like. A slot is cut in the outer conductor to accommodate the scanning antenna on the tracked vehicle and high frequency signals such as television signals are applied to the central conductor for transmission purposes. In high frequency signal transmission apparatus of this type, large fluctua-tions in the field strength of the signal being transmitted along the line represents a severe problem and in many cases, such fluctuations in field strenglh so adversely affect the transmission quality of the signal that adequate reception becomes unavailable.
~ .
~070~324 Field strength fluctuations which occur in transmission apparatus of this kind are principally caused by interfering fields associated with reflections ~ standing waves formed on the tracks or the support elements therefor on which the tracked vehicle operates which in turn are picked up by the parallely disposed outer conductor of the coaxial cable through which transmission is occurring. Under these circumstances, as will be appreciated by those of ordinary skill in the art, the scanning antenna on the tracked vehicle will pick up a resulting si~nal comprising both the transmitted signal and the induced reflections and standing waves so that the resulting signal received on the tracked vehlcle will exhibit widely varying field strength characteristics.
One solution to this problem as disclosed in Gerr~n Patent 2,404,363 to Siemens A.G. of January 30, 1974 involves an encapsulation of the outer conductor of the high frequency transmission cable, as well as the termina-tion of the ends of the outer conductor with a character-istic impedence connected between the outer conductor and metallic material upon which interfering reflections and standing waves formItherefor the characteristic ~ bnce has a value egual to the line formed between the outer conductor and the metallic material so as to eliminate undesired interference. Using this technique, excellent results may be obtained; however, the resulting stucture may only be employed for a very limited, defined frequency range whose maximum frequency is constrained by the limitation that the half wave length thereof must be sm2ller than the line length. Accordingly, this technique may be employed for low frequency tranmission and hence is not universal in application. Furthermore, it will be readily appreciated by tho~e of ordinary skill in the art ,~ 2 10~0t324 that structural asseIr~bly difficulties are common because the value of the wave resistor employed for terminating must be initially determined through exper- mentation .
An additional disadvantage associated with the above mentioned technique is that the same does not function if the interference is generated by conductors which are isolated with respect to grounds. These conditions frequently obtain because additional electrical lines which are disposed in a parallel relationship to the track and the radiating high frequency central conductor are usually employed for the purposes of supplying control signals for the tracked vehicle system or alternatively, the tracks themselves ,nay be isolated from ground and employed to convey such electrical control information. Under these circumstances, field strength fluctuations in the radiated signals are creatcd by interference associated w ith electromagnetic wa ve expansion within the radiatlng high frequency central conductor and the external line system which may be formed, for instance, between the outer conductor of the cGaxial pair and for example, a parallely positioned electrical line. The secondary electrical wave in such an outer line system is induced by the radiating centrally disposed high frequency conductor.
Therefore, it is an object of the present invention to provide apparatus which permits interference free transmission of high frequency signals in any given frequency range, said apparatus being effective to accomplish interference free transmissions even in the presence of conductors which are isolated with respect to ground.
In accordance with the teachings of the present invention, apparatus which permits interference free transmission of high .- , 1~3708Z4 frequency signals in any given frequency range is provided wherein a central conductor of a coaxially disposed pair of conductors is employed to radiate high frequency signal information and said coaxial disposed pair of conductors is mounted in a parallel manner to the path of a tracked vehicle on support means, sai~ support means including metallic means disposed along the entire length of said coaxial disposed pair of conductors and periodically connected to the outer conductor of said coaxial disposed pair of conductors to sub-stantially reduce field strength fluctuations through a suppression of induced secondary waves in the immediate proximity of said central conductor. The invention will be more clearly understood by reference to the following detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings in whïch:
Figure 1 is a schematic plane view of a track installation 15 employing apparatus for transmitting high frequency signals in accordance with the instant invention;
Figure 2 is a front view of the apparatus for transmitting high frequency signals according to the instant invention which shows details of the support and mounting means therefor; and Figure 3 is a detailed view in cross section of mounl;ed - apparatus for transmitting high frequency signals illustrating the coaxial pair of the conductors disposed within a housing and mounted in accordance with the teachings of the instant invention.
Reierring now to Figure 1, there is generally shown a track installation for track bound vehicles which is provided with ... . : :- . . : .. . :
apparatus for transmitting high frequency signals in accordance with the teachings of the instant invention. More particularly, as shown in Figure 1, the track installation comprises a pair of tracks 1 and 2 which are mounted on ties 3 in the manner of a well known S railroad mounting. On this track installation, a vehicle 4 is mountedwhich has an antenna 5 arranged to receive high frequency signal information from parallely disposed transmission equipment which includes a coaxial cable 6, which is formed and mounted, as shall be seen hereinafter, in accordance with the teachings of the instant invention. Additionally, the track installation is provided with an electrical line 7 which is also parallely disposed to the tracks and - the coaxial conductor pair 6 and here may be assumed to provide control information or power to the tracked vehicle to control the operation thereof. Since both the electrical line 7 and the coaxial pair 6 are disposed in a parallel relationship interference as a result of the electromagnetic radiation from line 7 will be induced in the outer cable of the conductive pair if the same is not properly isolated - in the manner taught by the instant invention. Furthermore, standing waves and reflections associated with the tracks 2 and 7 will also be induced in the outer conductor of the conductive pair 6 which results in extreme field strength fluctuations when the central conductor of the conductive pair is utilized to radiate high frequency signal information such as used to convey video signals to the tracked vehicle 4 through antenna 5.
7082~
To provide appropriate isolation for the outer conductor of the conductor pair 6 employed to convey high frequency signal infor-mation, additional material is provided for mounting the conductive pair 6 along the total length of the line and the outer conductor of the conductor pair is electrically connected thereto. Due to this additional metallic material, the effective dielectric space between the outer conductor of the conductive pair 6 and the support therefor is decreased.
In this manner, secondary waves which are induced in the immediate vicinity of the central conductor of the coaxial pair are substantially suppressed so that interference free operation of the high frequency radiating central conductor is achieved without a creation of field strength fluctuations. The manner in which the exemplary embodiment of the instant invention is implemented is best shown in Figure 2.
Referring now to Figure 2, it will be seen that the support 8 for the conductive pair 6 is provided with a metallic strip 9 which, in the exemplary embodiment, underlies the conductive pair 6 along the entire length thereof and thus provide a conductive surface along the entire length of the coaxial disposed pair of conductors 6. The conductive pair of cables 6 is mounted on support 8 by means of supporting elements 10 and for the purpose of eliminatlng field strength fluctuations due to induced secondary waves, standing wavesand reflections, the outer conductor of the cor~uctor pair 6 may be electri-cally connected to the metal strip 9 through the supporting elements 10. This electrical connection is generally indicated in Figure 2 by the wavy lines 11 within the ,support elements 10, In order to assure the elimination of interference for the total frequency range, it is .. , . . , ~ ,, 1~7~824 desireable that the placement of the conductive connections between the metal strip and the outer conductor of the conductive pair 6 have a distance which is le~.s than the half wave length OI the highest frequency to be transmitted within the central conductor of the con-ductive pair 6. However, since the distance between the supporting elements 10 with respect to one another will generally correspond to this value, the requisite periodicity in mounting can generally be provided simply by providing a connection between the outer one of ', the conductors in cable 6 to the metallic strip 9 through the support elements 10. While the manner in which the invention is implemented has been generally illustrated in Figure 2, actual construction details may be best, appreciated upon a consideration of Figure 3 which shows ,, a coaxial pair of conductors mounted in accordance with an embodiment of the instant invention wherein such cross section has been taken through one of the support elements 10 shown in Figure 2.
Referring now to Figure 3, it will be seen that the coaxial pair of conductors forming the high frequency line or cable 6 comprises an inner conductor 12, an outer conductor 13, separated from one another in the well known manner by a coaxially disposed intervening layer of dielectric material 14. The inner conductor 12 is adapted to receive high frequency signal information such as video information to be supplied to the tracked vehicle 4 and to radiate such information so that the same may be picked up by the antenna 5. Although not shown in detail in Figure 3, the outer conductor 13 of the coaxial pair is provided with a longitudinal slot so that the antenna 5 of the vehicle may be accepted therein as the vehicle moves down the track. The 1~70824 high frequency cable comprising the coaxially disposed conductors 6 is encompassed by a jacket 15 in the conventional manner, and in the case of the embodiment illustrated in Figure 3, this assembly may be provided with a cover plate 16 extending along the whole length of the coaxial pair. The cover plate 16 thus functions to replace the periodic support elements 10 shown in Figure 2 while additionally providing environmental protection and additional rigidity for the mounted coaxial cable 6. In the case of the embodiment shown in Figure 3, the inner surface of the cover plate 16 may be provided with a metallic layer 17 in lieu of the metallic strip 9 and it will be appreciated that the metallic layer 17 extends along the entire length of thecoaxial pair as well as the cover plate 16. The metallic layer 17 is periodically connected to the outer conductor 13 of the coaxial pair 6 through conductors or the like indicated by the conductors 18 and it will be appreciated by those of ordinary skill in the art that the periodicity of the connection of the outer conductor 13 to the metallic layer 17 will correspond to that described in association with connections 11 in Figure 2. These connections, it will be recalled, are only necessary at certain intervals, which intervals must exhibit a displacement which is less than the half wave length of the highest frequency to be transmitted. The use of a metallic layer such as illustrated as layer 17 withln the surface of the continuous cover plate 16 rather than using the metallic strip of the type illustrated by strip 9 in Figure 2 achieves a form of enlargement of the outer conductor 13 of the coaxlal pair which also acts to suppress the creation of secondary waves in the manner described above. I~owever, regardless of which 1075;~8Z4 form of metallic strip is employed, very substantial suppression of secondary waves, reflections and standing waves associated with a parallel conductor such as 7 or the tracks 1 and 2 is achieved in the vicinity of the central conductor 12 so that high frequency signal information may be radiated therefrom without substantial fluctuations in field strength. This is thought to occur because the metallic material to which the outer conductor is connected acts to decrease the effective dielectric interval between the outer conductor 13 of the coaxial pair or high frequency cable and the support therefor so that any secondary waves which may be induced are substantially suppressed in the vicinity of the coaxial pair of cables f~. Ther efore, interference free operation of the high frequency cable is possible without a creation of substantial field strength variations and this result is obtained to a highlyadvantageous degree when the distances of the points of connection between the outer conductor 13 and the metallic strip or layer 17 or 9 occurs with a periodicity such that the distance between points of connection is less than tne half wave length of the highest frequency to be transmitted.
As will be appreciated by those of ordinary skill in the art, the nature of t~e support, employed for transmitting apparatus for high frequency signal information of the type described herein may vary widely and frequently employ metallic material disposed over substantially the entire length of the coaxial pair of conductors.
Under these conditions, separate metallic layers or strips need not be provided as that available in the support structure may be utilized so long as the periodic connection of the outer conductor 14 to such -9- ,.
1070~324 metallic material is implemented with the requisite periodicity as described above.
Although the present invention has been disclosed in conjunction with rather simplified exemplary embodiments, it will be appreciated by those of ordinary skill in the art that the apparatus for transmitting high frequency signals disclosed herein will admit of a multitude of variations and adaptations. Therefore, it is manifestly intended that this invention be only limited by the claims and the equ ~lenta thereol.
.
High frequency signal transmission apparatus employed with track bound vehicles and particularly that relied upon for tele~sion transmission thereto generally takes the form of a radiating central conductor disposed in a parallel relationship to the track which is scanned by antenna mounted on the track bound vehicle. The radiating central conductor generally takes the form of the inner conductor of a coaxially mounted pair having dielectric material interposed between the radiating central conductor and the outer conductor employed for the purposes of shielding and the like. A slot is cut in the outer conductor to accommodate the scanning antenna on the tracked vehicle and high frequency signals such as television signals are applied to the central conductor for transmission purposes. In high frequency signal transmission apparatus of this type, large fluctua-tions in the field strength of the signal being transmitted along the line represents a severe problem and in many cases, such fluctuations in field strenglh so adversely affect the transmission quality of the signal that adequate reception becomes unavailable.
~ .
~070~324 Field strength fluctuations which occur in transmission apparatus of this kind are principally caused by interfering fields associated with reflections ~ standing waves formed on the tracks or the support elements therefor on which the tracked vehicle operates which in turn are picked up by the parallely disposed outer conductor of the coaxial cable through which transmission is occurring. Under these circumstances, as will be appreciated by those of ordinary skill in the art, the scanning antenna on the tracked vehicle will pick up a resulting si~nal comprising both the transmitted signal and the induced reflections and standing waves so that the resulting signal received on the tracked vehlcle will exhibit widely varying field strength characteristics.
One solution to this problem as disclosed in Gerr~n Patent 2,404,363 to Siemens A.G. of January 30, 1974 involves an encapsulation of the outer conductor of the high frequency transmission cable, as well as the termina-tion of the ends of the outer conductor with a character-istic impedence connected between the outer conductor and metallic material upon which interfering reflections and standing waves formItherefor the characteristic ~ bnce has a value egual to the line formed between the outer conductor and the metallic material so as to eliminate undesired interference. Using this technique, excellent results may be obtained; however, the resulting stucture may only be employed for a very limited, defined frequency range whose maximum frequency is constrained by the limitation that the half wave length thereof must be sm2ller than the line length. Accordingly, this technique may be employed for low frequency tranmission and hence is not universal in application. Furthermore, it will be readily appreciated by tho~e of ordinary skill in the art ,~ 2 10~0t324 that structural asseIr~bly difficulties are common because the value of the wave resistor employed for terminating must be initially determined through exper- mentation .
An additional disadvantage associated with the above mentioned technique is that the same does not function if the interference is generated by conductors which are isolated with respect to grounds. These conditions frequently obtain because additional electrical lines which are disposed in a parallel relationship to the track and the radiating high frequency central conductor are usually employed for the purposes of supplying control signals for the tracked vehicle system or alternatively, the tracks themselves ,nay be isolated from ground and employed to convey such electrical control information. Under these circumstances, field strength fluctuations in the radiated signals are creatcd by interference associated w ith electromagnetic wa ve expansion within the radiatlng high frequency central conductor and the external line system which may be formed, for instance, between the outer conductor of the cGaxial pair and for example, a parallely positioned electrical line. The secondary electrical wave in such an outer line system is induced by the radiating centrally disposed high frequency conductor.
Therefore, it is an object of the present invention to provide apparatus which permits interference free transmission of high frequency signals in any given frequency range, said apparatus being effective to accomplish interference free transmissions even in the presence of conductors which are isolated with respect to ground.
In accordance with the teachings of the present invention, apparatus which permits interference free transmission of high .- , 1~3708Z4 frequency signals in any given frequency range is provided wherein a central conductor of a coaxially disposed pair of conductors is employed to radiate high frequency signal information and said coaxial disposed pair of conductors is mounted in a parallel manner to the path of a tracked vehicle on support means, sai~ support means including metallic means disposed along the entire length of said coaxial disposed pair of conductors and periodically connected to the outer conductor of said coaxial disposed pair of conductors to sub-stantially reduce field strength fluctuations through a suppression of induced secondary waves in the immediate proximity of said central conductor. The invention will be more clearly understood by reference to the following detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings in whïch:
Figure 1 is a schematic plane view of a track installation 15 employing apparatus for transmitting high frequency signals in accordance with the instant invention;
Figure 2 is a front view of the apparatus for transmitting high frequency signals according to the instant invention which shows details of the support and mounting means therefor; and Figure 3 is a detailed view in cross section of mounl;ed - apparatus for transmitting high frequency signals illustrating the coaxial pair of the conductors disposed within a housing and mounted in accordance with the teachings of the instant invention.
Reierring now to Figure 1, there is generally shown a track installation for track bound vehicles which is provided with ... . : :- . . : .. . :
apparatus for transmitting high frequency signals in accordance with the teachings of the instant invention. More particularly, as shown in Figure 1, the track installation comprises a pair of tracks 1 and 2 which are mounted on ties 3 in the manner of a well known S railroad mounting. On this track installation, a vehicle 4 is mountedwhich has an antenna 5 arranged to receive high frequency signal information from parallely disposed transmission equipment which includes a coaxial cable 6, which is formed and mounted, as shall be seen hereinafter, in accordance with the teachings of the instant invention. Additionally, the track installation is provided with an electrical line 7 which is also parallely disposed to the tracks and - the coaxial conductor pair 6 and here may be assumed to provide control information or power to the tracked vehicle to control the operation thereof. Since both the electrical line 7 and the coaxial pair 6 are disposed in a parallel relationship interference as a result of the electromagnetic radiation from line 7 will be induced in the outer cable of the conductive pair if the same is not properly isolated - in the manner taught by the instant invention. Furthermore, standing waves and reflections associated with the tracks 2 and 7 will also be induced in the outer conductor of the conductive pair 6 which results in extreme field strength fluctuations when the central conductor of the conductive pair is utilized to radiate high frequency signal information such as used to convey video signals to the tracked vehicle 4 through antenna 5.
7082~
To provide appropriate isolation for the outer conductor of the conductor pair 6 employed to convey high frequency signal infor-mation, additional material is provided for mounting the conductive pair 6 along the total length of the line and the outer conductor of the conductor pair is electrically connected thereto. Due to this additional metallic material, the effective dielectric space between the outer conductor of the conductive pair 6 and the support therefor is decreased.
In this manner, secondary waves which are induced in the immediate vicinity of the central conductor of the coaxial pair are substantially suppressed so that interference free operation of the high frequency radiating central conductor is achieved without a creation of field strength fluctuations. The manner in which the exemplary embodiment of the instant invention is implemented is best shown in Figure 2.
Referring now to Figure 2, it will be seen that the support 8 for the conductive pair 6 is provided with a metallic strip 9 which, in the exemplary embodiment, underlies the conductive pair 6 along the entire length thereof and thus provide a conductive surface along the entire length of the coaxial disposed pair of conductors 6. The conductive pair of cables 6 is mounted on support 8 by means of supporting elements 10 and for the purpose of eliminatlng field strength fluctuations due to induced secondary waves, standing wavesand reflections, the outer conductor of the cor~uctor pair 6 may be electri-cally connected to the metal strip 9 through the supporting elements 10. This electrical connection is generally indicated in Figure 2 by the wavy lines 11 within the ,support elements 10, In order to assure the elimination of interference for the total frequency range, it is .. , . . , ~ ,, 1~7~824 desireable that the placement of the conductive connections between the metal strip and the outer conductor of the conductive pair 6 have a distance which is le~.s than the half wave length OI the highest frequency to be transmitted within the central conductor of the con-ductive pair 6. However, since the distance between the supporting elements 10 with respect to one another will generally correspond to this value, the requisite periodicity in mounting can generally be provided simply by providing a connection between the outer one of ', the conductors in cable 6 to the metallic strip 9 through the support elements 10. While the manner in which the invention is implemented has been generally illustrated in Figure 2, actual construction details may be best, appreciated upon a consideration of Figure 3 which shows ,, a coaxial pair of conductors mounted in accordance with an embodiment of the instant invention wherein such cross section has been taken through one of the support elements 10 shown in Figure 2.
Referring now to Figure 3, it will be seen that the coaxial pair of conductors forming the high frequency line or cable 6 comprises an inner conductor 12, an outer conductor 13, separated from one another in the well known manner by a coaxially disposed intervening layer of dielectric material 14. The inner conductor 12 is adapted to receive high frequency signal information such as video information to be supplied to the tracked vehicle 4 and to radiate such information so that the same may be picked up by the antenna 5. Although not shown in detail in Figure 3, the outer conductor 13 of the coaxial pair is provided with a longitudinal slot so that the antenna 5 of the vehicle may be accepted therein as the vehicle moves down the track. The 1~70824 high frequency cable comprising the coaxially disposed conductors 6 is encompassed by a jacket 15 in the conventional manner, and in the case of the embodiment illustrated in Figure 3, this assembly may be provided with a cover plate 16 extending along the whole length of the coaxial pair. The cover plate 16 thus functions to replace the periodic support elements 10 shown in Figure 2 while additionally providing environmental protection and additional rigidity for the mounted coaxial cable 6. In the case of the embodiment shown in Figure 3, the inner surface of the cover plate 16 may be provided with a metallic layer 17 in lieu of the metallic strip 9 and it will be appreciated that the metallic layer 17 extends along the entire length of thecoaxial pair as well as the cover plate 16. The metallic layer 17 is periodically connected to the outer conductor 13 of the coaxial pair 6 through conductors or the like indicated by the conductors 18 and it will be appreciated by those of ordinary skill in the art that the periodicity of the connection of the outer conductor 13 to the metallic layer 17 will correspond to that described in association with connections 11 in Figure 2. These connections, it will be recalled, are only necessary at certain intervals, which intervals must exhibit a displacement which is less than the half wave length of the highest frequency to be transmitted. The use of a metallic layer such as illustrated as layer 17 withln the surface of the continuous cover plate 16 rather than using the metallic strip of the type illustrated by strip 9 in Figure 2 achieves a form of enlargement of the outer conductor 13 of the coaxlal pair which also acts to suppress the creation of secondary waves in the manner described above. I~owever, regardless of which 1075;~8Z4 form of metallic strip is employed, very substantial suppression of secondary waves, reflections and standing waves associated with a parallel conductor such as 7 or the tracks 1 and 2 is achieved in the vicinity of the central conductor 12 so that high frequency signal information may be radiated therefrom without substantial fluctuations in field strength. This is thought to occur because the metallic material to which the outer conductor is connected acts to decrease the effective dielectric interval between the outer conductor 13 of the coaxial pair or high frequency cable and the support therefor so that any secondary waves which may be induced are substantially suppressed in the vicinity of the coaxial pair of cables f~. Ther efore, interference free operation of the high frequency cable is possible without a creation of substantial field strength variations and this result is obtained to a highlyadvantageous degree when the distances of the points of connection between the outer conductor 13 and the metallic strip or layer 17 or 9 occurs with a periodicity such that the distance between points of connection is less than tne half wave length of the highest frequency to be transmitted.
As will be appreciated by those of ordinary skill in the art, the nature of t~e support, employed for transmitting apparatus for high frequency signal information of the type described herein may vary widely and frequently employ metallic material disposed over substantially the entire length of the coaxial pair of conductors.
Under these conditions, separate metallic layers or strips need not be provided as that available in the support structure may be utilized so long as the periodic connection of the outer conductor 14 to such -9- ,.
1070~324 metallic material is implemented with the requisite periodicity as described above.
Although the present invention has been disclosed in conjunction with rather simplified exemplary embodiments, it will be appreciated by those of ordinary skill in the art that the apparatus for transmitting high frequency signals disclosed herein will admit of a multitude of variations and adaptations. Therefore, it is manifestly intended that this invention be only limited by the claims and the equ ~lenta thereol.
.
Claims (9)
1. Apparatus for transmitting high frequency signals to a vehicle adapted to travel along a predetermined path comprising:
a reflecting high frequency cable disposed parallel to said path, said reflecting high frequency cable including a central conductor for radiating high frequency information, coaxially disposed outer con-ductor means configured to enable transmission of said high frequency information from said central conductor and a coaxially disposed layer of dielectric material intermediate said central and outer conductors;
support means for mounting said cable in parallel with said predetermined path, said support means including metallic material disposed along the length of said cable; and means for electrically connecting said outer conductor to said metallic material at predetermined intervals along the length of said cable.
a reflecting high frequency cable disposed parallel to said path, said reflecting high frequency cable including a central conductor for radiating high frequency information, coaxially disposed outer con-ductor means configured to enable transmission of said high frequency information from said central conductor and a coaxially disposed layer of dielectric material intermediate said central and outer conductors;
support means for mounting said cable in parallel with said predetermined path, said support means including metallic material disposed along the length of said cable; and means for electrically connecting said outer conductor to said metallic material at predetermined intervals along the length of said cable.
2. The apparatus for transmitting high frequency signals according to Claim 1 wherein said predetermined intervals represent dis-placement distances which are less than the half wave length of the highest frequency to be transmitted through said central conductor.
3. The apparatus for transmitting high frequency signals according to Claim 1 wherein said support means is isolated with respect to ground and said metallic material comprises a metallic strip disposed on said support means.
4. The apparatus for transmitting high frequency signals according to Claim 3 additionally comprising a plurality of support element means periodically mounted on said support means for fixedly mounting said cable thereto, said means for connecting being extended through selected ones of said plurality of support element means.
5. The apparatus for transmitting high frequency signals according to Claim 4 wherein said predetermined intervals represent displacement distances which are less than the half wave length of the highest frequency to be transmitted through said central conductor.
6. The apparatus for transmitting high frequency signals according to Claim 1 wherein said support means comprises cover plate means enclosing said cable and providing a support therefor, said metal-lic material being disposed as a layer on interior surface portions of said cover plate means.
7. The apparatus for transmitting high frequency signals according to Claim 6 wherein said means for connecting comprises wire means connected between said outer conductor and said metallic material layer at said predetermined intervals.
8. The apparatus for transmitting high frequency signals according to Claim 7 wherein said cover plate means extends the full length of the cable.
9. The apparatus for transmitting high frequency signals according to Claim 8 wherein said predetermined intervals represent displacement distances which are less than the half wave length of the highest frequency to be transmitted through said central conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA247,820A CA1070824A (en) | 1976-03-12 | 1976-03-12 | Apparatus for transmitting high frequency signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA247,820A CA1070824A (en) | 1976-03-12 | 1976-03-12 | Apparatus for transmitting high frequency signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1070824A true CA1070824A (en) | 1980-01-29 |
Family
ID=4105452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA247,820A Expired CA1070824A (en) | 1976-03-12 | 1976-03-12 | Apparatus for transmitting high frequency signals |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1070824A (en) |
-
1976
- 1976-03-12 CA CA247,820A patent/CA1070824A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5255002A (en) | Antenna for vehicle window | |
| EP0332139B1 (en) | Wide band antenna for mobile communications | |
| US4658259A (en) | On-glass antenna | |
| US4129841A (en) | Radiating cable having spaced radiating sleeves | |
| EP1554775B1 (en) | Vehicular antenna with improved screening | |
| US5406295A (en) | Window antenna for a motor vehicle body | |
| EP0568284B1 (en) | Antenna for vehicle window | |
| EP0418047B1 (en) | Glass window antenna for motor vehicle | |
| US7403171B2 (en) | System for isolating an auxiliary antenna from a main antenna mounted in a common antenna assembly | |
| US4053835A (en) | Apparatus for transmitting high frequency signals | |
| EP0188347B1 (en) | A leaky coaxial cable and method of making such a cable | |
| US20020179313A1 (en) | Cable connection structure and electronic apparatus having the same | |
| US2127088A (en) | Feeder and the like for electric currents of high frequency | |
| USRE33743E (en) | On-glass antenna | |
| EP0618637B1 (en) | Antenna structure | |
| CA1070824A (en) | Apparatus for transmitting high frequency signals | |
| US6292150B1 (en) | Glass antenna device | |
| US3949329A (en) | Radiating transmission lines | |
| US11978993B2 (en) | Connector cable that prevents both increase in impedance and a short circuit in a connector cable that connects a connector and a shielded cable via a relay substrate | |
| US3564111A (en) | High frequency transmission line | |
| KR970068013A (en) | Antenna grounding structure | |
| US3060428A (en) | Coaxial cable antenna coupler | |
| CN218005268U (en) | Antenna structure | |
| KR0175487B1 (en) | Slit antenna | |
| US7507904B2 (en) | Electrical conductor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |