EP0343465B1 - Rotatable antenna with a bearing and a counterweight - Google Patents
Rotatable antenna with a bearing and a counterweight Download PDFInfo
- Publication number
- EP0343465B1 EP0343465B1 EP89108666A EP89108666A EP0343465B1 EP 0343465 B1 EP0343465 B1 EP 0343465B1 EP 89108666 A EP89108666 A EP 89108666A EP 89108666 A EP89108666 A EP 89108666A EP 0343465 B1 EP0343465 B1 EP 0343465B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- antenna
- rod part
- bearing
- short
- impedance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/02—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole
- H01Q3/08—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole for varying two co-ordinates of the orientation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/08—Means for collapsing antennas or parts thereof
- H01Q1/084—Pivotable antennas
Definitions
- the invention relates to a rotatable antenna according to the preamble of patent claim 1.
- a broadband rod antenna is known from DE-OS 26 42 001, in which the outer conductor of the coaxial antenna feed line is connected to a counterweight and the inner conductor is connected to the antenna rod via a matching transformer.
- the rod antenna is mounted in a sleeve made of non-conductive material, which is fixed to the counterweight by means of a metal sleeve.
- an impedance matching circuit is provided in addition to the matching transformer.
- the antenna rod is shorter than the ⁇ / 4 wavelength of the lowest operating frequency, and by means of the matching transformer the resulting capacitive reactive component is largely compensated for, so that a real base resistance occurs.
- the other end of the coaxial antenna feed cable is connected to the input of the telecommunications device via the impedance matching circuit and a ⁇ / 4 long coaxial matching section.
- the bearing should also enable a contact-safe connection between the antenna and antenna feed cable when the antenna is rotated. If, for safety reasons, a galvanic separation from the line network to the power supply of the device is required, the separation of the antenna from the device can be ensured by inserting a capacitor into the antenna feed line. At high frequencies, however, a mismatch occurs between the antenna and the device if the galvanic isolation is carried out by means of capacitors.
- the invention has for its object to design a rotatable antenna such that both a contact-safe connection between the antenna and antenna feed cable, a free choice of antenna rod length and a galvanic isolation of the antenna from the power supply to the device is made possible.
- the capacitive rotary coupling according to the invention allows both the adaptation between the antenna impedance and the impedance of the antenna feed line as well as the electrical isolation from the line network.
- the antenna rod length is largely freely selectable and a contact-safe connection between the antenna and antenna feed cable is ensured even when the antenna is rotated about the axis.
- the bearing for the short antenna rod part serves as a friction clutch.
- the solid angle set by means of the long antenna rod part is ensured by the frictional connection via the universal joint connecting the two antenna rod parts.
- the embodiment of the antenna according to claim 3 is inexpensive to manufacture by using means of simple design.
- the requirement for electrical isolation of the antenna from the line network is also met for high voltages, since the collar of the bearing shell acts electrically as a creepage distance.
- the counterweight in the form of a strip line according to claim 8, the counterweight can be accommodated in full in the extension of the antenna rod, even with a limited overall height of the devices.
- the rotary coupling and the counterweight are attached to a rotatably mounted support, so show Antenna and counterweight always have the same polarization. As a result, high sensitivity requirements can be met.
- the message is transmitted between a base station and the associated mobile station via a radio channel.
- the base station is connected by means of a junction box to a main connection of the public telephone network or to a private branch exchange, so that access to the public telephone network is possible for the user of the cordless telephone.
- the base station also has a connection for power supply from the 220 V network.
- the mobile station contains an accumulator, which is charged with a permanent charging current from the 220 V network when the handset is placed on the base station.
- a cordless telephone is known in which a reserve accumulator is arranged in the base station, which has a fast charging current during the transmission operation of the mobile station due to the loop direct current flowing via the telecommunication line (a / b wire), which is about three times as high as the permanent charging current.
- the antenna should now be galvanically isolated from the line network to supply power to the cordless telephone. The efficiency of the antenna should not be reduced when this requirement is met, a contact-safe connection between the antenna and antenna feed cable still being possible even when the antenna is rotated.
- the antenna 1 shows an embodiment for a bearing L in the form of a capacitive rotary coupling which is matched to the antenna impedance and impedance of the antenna feed line SL.
- the antenna is designed in the form of a two-part rod antenna, the antenna rod AS having a long antenna rod part AS1 and a short antenna rod part AS2, which are connected to one another via a universal joint KG.
- the bearing L for the short antenna rod part AS2 serves as a friction clutch.
- the bearing L has a bearing shell LS (see FIG. 2) made of non-conductive material, which encloses the short antenna rod part AS2, and a holder H which fixes the bearing shell LS on a support A made of conductive material.
- the bearing shell LS can be designed in the form of a half shell (see FIG. 2) or as a sleeve and has at least one collar LB1 (LB2) encircling the short antenna rod part AS 2 on the edges. From an electrical point of view, this collar LB1 (LB2) acts as a creepage distance.
- the holder H like the bearing shell LS, can be listed in sections as a mirror image of the surface shape of the short antenna rod part AS2 and has two in the embodiment shown in FIG. 1 Bracket H1, H2, one of the brackets can be clamped on the support A.
- the inner conductor SL1 of the antenna feed line SL is connected to the holder H and the outer conductor SL2 of the antenna feed line SL is connected to a counterweight G.
- FIG. 2 shows a sectional view along the line BB in FIG. 1.
- the two holding brackets H1, H2 have a height offset, one holding bracket H1 engaging behind a recess AU in the support A and the other holding bracket H2 on the support A by means of a Screw S can be clamped.
- the bearing shell LS is designed as a half shell, but this can also be designed as a sleeve or the like.
- the bearing shell LS has an elevation LE encircling the short antenna rod part AS2, in particular in the form of a nose, which engages in an annular groove RN of the short antenna rod part AS2.
- the electrical connection between the inner conductor SL1 of the antenna feed line SL and the bracket H2 is ensured by means of a soldering tab L ⁇ .
- the outer conductor SL2 of the antenna feed line SL can be soldered directly to the counterweight G.
- the counterweight G is designed in the form of a strip line in the embodiment shown in FIG. 1, with adjustment on the antenna impedance and impedance of the antenna feed line SL, the strip line is U-shaped and the adaptation is essentially determined by the distance and length of the U-legs and by the strip line width.
- the stripline for example the stripline can be meandering.
- the friction force between the bearing shell LS and the short antenna rod parts AS2 can be adjusted by means of the screw S.
- the bearing shell LS is preferably a plastic part, which is elastically deformable and abrasion-resistant.
- FIG. 3 shows the measured horizontal diagram for a rotatable, two-part rod antenna with a capacitive rotary coupling and counterweight.
- the field strength curve in the horizontal plane is essentially circular (with 2 to 3 dB indents) and in the vertical plane essentially cardiod-like (not shown).
- the rotatable antenna according to the invention enables automatic production and meets the requirements for a galvanic separation between antenna and device, an adaptation of antenna and device and a free choice of antenna rod length in a surprisingly simple manner.
Landscapes
- Support Of Aerials (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Details Of Aerials (AREA)
- Cage And Drive Apparatuses For Elevators (AREA)
Abstract
Description
Die Erfindung betrifft eine drehbare Antenne nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a rotatable antenna according to the preamble of
Für elektrische Geräte der Nachrichtentechnik werden meist Sende- und Empfangsantennen in Form von Stab- oder Teleskopantennen benutzt. Aus der DE-OS 26 42 001 ist eine Breitband-Stabantenne bekannt, bei der der Außenleiter der koaxialen Antennenspeiseleitung mit einem Gegengewicht verbunden ist und der Innenleiter über einen Anpaßtransformator mit dem Antennenstab verbunden ist. Die Stabantenne ist in einer Hülse aus nichtleitendem Material gelagert, welche mittels einer Metallhülse am Gegengewicht festgelegt ist. Zur Anpassung der Antennenimpedanz an die Impedanz der Antennenspeiseleitung ist neben dem Anpaßtransformator eine Impedanzanpaßschaltung vorgesehen. Der Antennenstab ist dabei kürzer als die λ/4 Wellenlänge der niedrigsten Betriebsfrequenz bemessen, und mittels des Anpaßtransformators wird die dadurch entstehende kapazitive Blindkomponente weitgehend kompensiert, so daß ein reeller Fußpunktwiderstand auftritt. Zur weiteren Anpassung des koaxialen Antennenspeisekabels an den Eingangswiderstand des nachrichtentechnischen Geräts ist das andere Ende des koaxialen Antennenspeisekabels über die Impedanz-Anpaßschaltung und einen λ/4-langen Koaxialanpaßabschnitt mit dem Eingang des nachrichtentechnischen Geräts verbunden.Transmitting and receiving antennas in the form of rod or telescopic antennas are mostly used for electrical devices in communications technology. A broadband rod antenna is known from DE-OS 26 42 001, in which the outer conductor of the coaxial antenna feed line is connected to a counterweight and the inner conductor is connected to the antenna rod via a matching transformer. The rod antenna is mounted in a sleeve made of non-conductive material, which is fixed to the counterweight by means of a metal sleeve. In order to match the antenna impedance to the impedance of the antenna feed line, an impedance matching circuit is provided in addition to the matching transformer. The antenna rod is shorter than the λ / 4 wavelength of the lowest operating frequency, and by means of the matching transformer the resulting capacitive reactive component is largely compensated for, so that a real base resistance occurs. For further adaptation of the coaxial antenna feed cable to the input resistance of the communications technology device the other end of the coaxial antenna feed cable is connected to the input of the telecommunications device via the impedance matching circuit and a λ / 4 long coaxial matching section.
In dem Fachbuch "Antennentechnik" von Rothammel, erschienen im Telekosmos-Verlag, Stuttgart, 1976, Seiten 315 - 317 sind Maßnahmen zur Kompensation von induktiven oder kapazitiven Blindkomponenten mittels zusätzlicher Kapazität oder zusätzlicher Induktivität, je nach Antennenstablänge, ausführlich beschrieben und erläutert.Measures for the compensation of inductive or capacitive reactive components by means of additional capacitance or additional inductance, depending on the antenna rod length, are described and explained in detail in the specialist book "Antenna technology" by Rothammel, published by Telekosmos-Verlag, Stuttgart, 1976, pages 315-317.
Bei drehbaren Antennen soll das Lager auch bei der Drehung der Antenne einen kontaktsicheren Anschluß zwischen Antenne und Antennenspeisekabel ermöglichen. Ist aus Sicherheitsgründen eine galvanische Trennung vom Leitungsnetz zur Stromversorgung des Geräts erforderlich, so kann durch Einfügen eines Kondensators in die Antennenspeiseleitung die Trennung der Antenne vom Gerät sichergestellt werden. Bei hohen Frequenzen tritt jedoch eine Fehlanpassung zwischen Antenne und Gerät auf, wenn die galvanische Trennung mittels Kondensatoren vorgenommen wird.In the case of rotatable antennas, the bearing should also enable a contact-safe connection between the antenna and antenna feed cable when the antenna is rotated. If, for safety reasons, a galvanic separation from the line network to the power supply of the device is required, the separation of the antenna from the device can be ensured by inserting a capacitor into the antenna feed line. At high frequencies, however, a mismatch occurs between the antenna and the device if the galvanic isolation is carried out by means of capacitors.
Für den Übergang von feststehenden Hohlleitern auf rotierende Hohlleiter verwendet man sogenannte Drehkupplungen. In dem Fachbuch "Taschenbuch der Hochfrequenztechnik" von Meincke/Gundlach, 2. Auflage, erschienen im Springer-Verlag, 1962, Seiten 367, 368 ist eine kapazitive Drehkupplung für den Ubergang von einer um die Längsachse rotierenden koaxialen Leitung auf eine festehende koaxiale Leitung beschrieben. Mit Hilfe im Leitungszug liegender Kondensatoren großer Kapazität kann eine galvanische Trennung der koaxialen Leitungen erreicht werden. Solche kapazitive Drehkupplungen werden insbesondere bei Radargeräten zur Energieübertragung benutzt.So-called rotary couplings are used for the transition from fixed waveguides to rotating waveguides. In the specialist book "Taschenbuch der Hochfrequenztechnik" by Meincke / Gundlach, 2nd edition, published by Springer-Verlag, 1962, pages 367, 368 described a capacitive rotary coupling for the transition from a coaxial line rotating about the longitudinal axis to a fixed coaxial line. With the help of large capacity capacitors in the cable run, galvanic isolation of the coaxial lines can be achieved. Such capacitive rotary couplings are used in particular in radar devices for energy transmission.
Der Erfindung liegt die Aufgabe zugrunde, eine drehbare Antenne derart auszugestalten, daß sowohl ein kontaktsicherer Anschluß zwischen Antenne und Antennenspeisekabel, eine freie Wahl der Antennenstablänge und eine galvanische Trennung der Antenne vom Leitungsnetz zur Stromversorgung des Geräts ermöglicht wird.The invention has for its object to design a rotatable antenna such that both a contact-safe connection between the antenna and antenna feed cable, a free choice of antenna rod length and a galvanic isolation of the antenna from the power supply to the device is made possible.
Diese Aufgabe wird bei einer gattungsgemäßen Antenne durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst.This object is achieved in a generic antenna by the characterizing features of
Die erfindungsgemäße kapazitive Drehkupplung erlaubt sowohl die Anpassung zwischen Antennenimpedanz und Impedanz der Antennenspeiseleitung als auch die galvanische Trennung vom Leitungsnetz. Die Antennenstablänge ist weitgehend frei wählbar und ein kontaktsicherer Anschluß zwischen Antenne und Antennenspeisekabel wird auch bei Drehung der Antenne um die Achse sichergestellt.The capacitive rotary coupling according to the invention allows both the adaptation between the antenna impedance and the impedance of the antenna feed line as well as the electrical isolation from the line network. The antenna rod length is largely freely selectable and a contact-safe connection between the antenna and antenna feed cable is ensured even when the antenna is rotated about the axis.
Bei einer Ausführungsform der Antenne nach Patentanspruch 2 dient das Lager für das kurze Antennenstabteil als Reibungskupplung. Der mittels des langen Antennenstabteils eingestellte Raumwinkel wird - über das die beiden Antennenstabteile miteinander verbindende Kreuzgelenk - durch die reibschlüssige Verbindung sichergestellt.In one embodiment of the antenna according to claim 2, the bearing for the short antenna rod part serves as a friction clutch. The solid angle set by means of the long antenna rod part is ensured by the frictional connection via the universal joint connecting the two antenna rod parts.
Die Ausführungsform der Antenne nach Patentanspruch 3 ist durch die Verwendung konstruktiv einfach ausgestalteter Mittel kostengünstig herstellbar.The embodiment of the antenna according to claim 3 is inexpensive to manufacture by using means of simple design.
Mit einer Ausgestaltung der Antenne nach Patentanspruch 4 wird die Forderung nach galvanischer Trennung der Antenne vom Leitungsnetz auch für hohe Spannungen erfüllt, da der Bund der Lagerschale elektrisch gesehen als Kriechstrecke wirkt.With an embodiment of the antenna according to claim 4, the requirement for electrical isolation of the antenna from the line network is also met for high voltages, since the collar of the bearing shell acts electrically as a creepage distance.
Durch die Ausgestaltung des Gegengewichts in Form einer Streifenleitung nach Patentanspruch 8 läßt sich - auch bei begrenzter Bauhöhe der Geräte - das Gegengewicht in voller Länge in der Verlängerung des Antennenstabs unterbringen.By designing the counterweight in the form of a strip line according to claim 8, the counterweight can be accommodated in full in the extension of the antenna rod, even with a limited overall height of the devices.
Wird gemäß der Ausführungsform einer Antenne nach Patentanspruch 10 die Drehkupplung und das Gegengewicht auf einer drehbar gelagerten Auflage befestigt, so zeigen Antenne und Gegengewicht stets die gleiche Polarisation. Dadurch können hohe Anforderungen an die Empfindlichkeit erfüllt werden.If, according to the embodiment of an antenna according to
Die Erfindung wird im folgenden anhand einer in der Zeichnung dargestellten Ausführungsform näher beschrieben und erläutert.The invention is described and explained in more detail below with reference to an embodiment shown in the drawing.
Es zeigen:
- Fig. 1
- eine Draufsicht auf eine Ausführungsform der erfindungsgemäßen Antenne,
- Fig. 2
- eine Schnittansicht längs der Linie B-B in Fig. 1 und
- Fig. 3
- das gemessene Horizontal-Diagramm der Antenne nach Fig. 1
- Fig. 1
- a plan view of an embodiment of the antenna according to the invention,
- Fig. 2
- a sectional view taken along line BB in Fig. 1 and
- Fig. 3
- the measured horizontal diagram of the antenna of FIG. 1st
Bei einem schnurlosen Telefonapparat erfolgt die Nachrichtenübertragung zwischen einer Basisstation und der zugehörigen Mobilstation über einen Funkkanal. Die Basisstation wird mittels einer Verbindungsdose an einen Hauptanschluß des öffentlichen Fernsprechnetzes oder an eine Nebenstellenanlage angeschlossen, so daß für den Benutzer des schnurlosen Telefons der Zugang zum öffentlichen Fernsprechnetz möglich ist. Die Basisstation weist zusätzlich einen Anschluß zur Stromversorgung aus dem 220 V-Netz auf. Die Mobilstation enthält einen Akkumulator, welcher bei auf der Basisstation aufgelegtem Handapparat mit einem Dauerladestrom aus dem 220 V-Netz aufgeladen wird.In the case of a cordless telephone, the message is transmitted between a base station and the associated mobile station via a radio channel. The base station is connected by means of a junction box to a main connection of the public telephone network or to a private branch exchange, so that access to the public telephone network is possible for the user of the cordless telephone. The base station also has a connection for power supply from the 220 V network. The mobile station contains an accumulator, which is charged with a permanent charging current from the 220 V network when the handset is placed on the base station.
Aus der DE-OS 36 20 857 ist ein schnurloses Telefon bekannt, bei dem in der Basisstation ein Reserve-Akkumulator angeordnet ist, welcher während des Sendebetriebs der Mobilstation durch den über die Fernmeldeleitung (a/b-Ader) fließenden Schleifengleichstrom mit einem Schnelladestrom, welcher etwa dreimal so hoch ist wie der Dauerladestrom, aufgeladen wird. Zur Verhütung von Unfällen soll nun eine galvanische Trennung der Antenne vom Leitungsnetz zur Stromversorgung des schnurlosen Telefons ermöglicht werden. Dabei soll sich der Wirkungsgrad der Antenne bei Erfüllung dieser Forderung nicht verringern, wobei auch bei Drehung der Antenne nach wie vor ein kontaktsicherer Anschluß zwischen Antenne und Antennenspeisekabel ermöglicht wird.From DE-OS 36 20 857 a cordless telephone is known in which a reserve accumulator is arranged in the base station, which has a fast charging current during the transmission operation of the mobile station due to the loop direct current flowing via the telecommunication line (a / b wire), which is about three times as high as the permanent charging current. To prevent accidents, the antenna should now be galvanically isolated from the line network to supply power to the cordless telephone. The efficiency of the antenna should not be reduced when this requirement is met, a contact-safe connection between the antenna and antenna feed cable still being possible even when the antenna is rotated.
In Fig. 1 ist eine Ausführungsform für ein Lager L in Form einer kapazitiven, an Antennenimpedanz und Impedanz der Antennenspeiseleitung SL angepaßten Drehkupplung dargestellt. Die Antenne ist dabei in Form einer zweiteiligen Stabantenne ausgebildet, wobei der Antennenstab AS ein langes Antennenstabteil AS1 und ein kurzes Antennenstabteil AS2 aufweist, welche über ein Kreuzgelenk KG miteinander verbunden sind. Zur Sicherstellung des am langen Antennenstabteil AS1 eingestellen Raumwinkels dient das Lager L für das kurze Antennenstabteil AS2 als Reibungskupplung.1 shows an embodiment for a bearing L in the form of a capacitive rotary coupling which is matched to the antenna impedance and impedance of the antenna feed line SL. The antenna is designed in the form of a two-part rod antenna, the antenna rod AS having a long antenna rod part AS1 and a short antenna rod part AS2, which are connected to one another via a universal joint KG. To ensure the solid angle set on the long antenna rod part AS1, the bearing L for the short antenna rod part AS2 serves as a friction clutch.
Das Lager L weist eine Lagerschale LS (s. Fig. 2) aus nichtleitendem Material, welche das kurze Antennenstabteil AS2 umschließt, und eine die Lagerschale LS auf einer Auflage A festspannende Halterung H aus leitendem Material auf. Die Lagerschale LS kann in Form einer Halbschale (vgl. Fig. 2) oder als Hülse ausgeführt sein und weist an den Rändern mindestens einen das kurze Antennenstabteil AS 2 umlaufenden Bund LB1 (LB2) auf. Dieser Bund LB1 (LB2) wirkt elektrisch gesehen als Kriechstrecke.The bearing L has a bearing shell LS (see FIG. 2) made of non-conductive material, which encloses the short antenna rod part AS2, and a holder H which fixes the bearing shell LS on a support A made of conductive material. The bearing shell LS can be designed in the form of a half shell (see FIG. 2) or as a sleeve and has at least one collar LB1 (LB2) encircling the short antenna rod part AS 2 on the edges. From an electrical point of view, this collar LB1 (LB2) acts as a creepage distance.
Die Halterung H kann ebenso wie die Lagerschale LS in Teilabschnitten spiegelbildlich zur Oberflächenform des kurzen Antennenstabteils AS2 aufgeführt werden und weist bei der in Fig. 1 dargestellten Ausführungsform zwei Haltewinkel H1, H2 auf, wobei einer der Haltewinkel auf der Auflage A aufspannbar ist. Der innere Leiter SL1 der Antennenspeiseleitung SL ist mit der Halterung H und der äußere Leiter SL2 der Antennenspeiseleitung SL ist mit einem Gegengewicht G verbunden.The holder H, like the bearing shell LS, can be listed in sections as a mirror image of the surface shape of the short antenna rod part AS2 and has two in the embodiment shown in FIG. 1 Bracket H1, H2, one of the brackets can be clamped on the support A. The inner conductor SL1 of the antenna feed line SL is connected to the holder H and the outer conductor SL2 of the antenna feed line SL is connected to a counterweight G.
Fig. 2 zeigt eine Schnittansicht längs der Linie B-B in Fig. 1. Die beiden Haltewinkel H1, H2 weisen einen Höhenversatz auf, wobei der eine Haltewinkel H1 eine Aussparung AU in der Auflage A hintergreift und der andere Haltewinkel H2 auf der Auflage A mittels einer Schraube S aufspannbar ist. Die Lagerschale LS ist bei der in Fig. 1 dargestellten Ausführungsform als Halbschale ausgeführt, diese kann jedoch auch als Hülse oder dgl. ausgestaltet werden. Zur Vermeidung einer axialen Verschiebung des kurzen Antennenstabteils AS2 in der Lagerschale LS weist die Lagerschale LS eine das kurze Antennenstabteil AS2 umlaufende Erhebung LE, insbesondere in Form einer Nase auf, welche in eine Ringnut RN des kurzen Antennenstabteils AS2 greift.FIG. 2 shows a sectional view along the line BB in FIG. 1. The two holding brackets H1, H2 have a height offset, one holding bracket H1 engaging behind a recess AU in the support A and the other holding bracket H2 on the support A by means of a Screw S can be clamped. In the embodiment shown in FIG. 1, the bearing shell LS is designed as a half shell, but this can also be designed as a sleeve or the like. In order to avoid an axial displacement of the short antenna rod part AS2 in the bearing shell LS, the bearing shell LS has an elevation LE encircling the short antenna rod part AS2, in particular in the form of a nose, which engages in an annular groove RN of the short antenna rod part AS2.
Die elektrische Verbindung zwischen dem inneren Leiter SL1 der Antennenspeiseleitung SL und Haltewinkel H2 wird mittels einer Lötfahne LÖ sichergestellt. Der äußere Leiter SL2 der Antennenspeiseleitung SL kann direkt am Gegengewicht G angelötet werden. Das Gegengewicht G ist bei der in Fig. 1 dargestellten Ausführungsform in Form einer Streifenleitung ausgestaltet, wobei zur Anpassung an Antennenimpedanz und Impedanz der Antennenspeiseleitung SL die Streifenleitung u-förmig ausgeführt ist und die Anpassung im wesentlichen durch Abstand und Länge der U-Schenkel und durch die Streifenleitungsbreite bestimmt wird. Daneben sind eine Reihe von verschiedenen Ausführungsformen für die Streifenleitung möglich, z.B. kann die Streifenleitung mäanderförmig ausgeführt werden.The electrical connection between the inner conductor SL1 of the antenna feed line SL and the bracket H2 is ensured by means of a soldering tab LÖ. The outer conductor SL2 of the antenna feed line SL can be soldered directly to the counterweight G. The counterweight G is designed in the form of a strip line in the embodiment shown in FIG. 1, with adjustment on the antenna impedance and impedance of the antenna feed line SL, the strip line is U-shaped and the adaptation is essentially determined by the distance and length of the U-legs and by the strip line width. In addition, a number of different embodiments are possible for the stripline, for example the stripline can be meandering.
Mittels der Schraube S kann die Reibungskraft zwischen Lagerschale LS und kurzen Antennenstabteilen AS2 eingestellt werden. Die Lagerschale LS ist vorzugsweise ein Kunststoffteil, welches elastisch verformbar und abriebfest ist.The friction force between the bearing shell LS and the short antenna rod parts AS2 can be adjusted by means of the screw S. The bearing shell LS is preferably a plastic part, which is elastically deformable and abrasion-resistant.
In Fig. 3 ist das gemessene Horizontaldiagramm für eine drehbare, zweiteilige Stabantenne mit kapazitiver Drehkupplung und Gegengewicht dargestellt. Der Feldstärkeverlauf in der Horizontalebene ist im wesentlichen kreisförmig (mit 2 bis 3 dB Einzügen) und in der Vertikalebene im wesentlichen Kardioden-ähnlich (nicht dargestellt).3 shows the measured horizontal diagram for a rotatable, two-part rod antenna with a capacitive rotary coupling and counterweight. The field strength curve in the horizontal plane is essentially circular (with 2 to 3 dB indents) and in the vertical plane essentially cardiod-like (not shown).
Die erfindungsgemäße drehbare Antenne ermöglicht eine automatische Fertigung und erfüllt auf überraschend einfache Art und Weise die Forderungen nach einer galvanischen Trennung zwischen Antenne und Gerät, einer Anpassung von Antenne und Gerät und einer freien Wahl der Antennenstablänge.The rotatable antenna according to the invention enables automatic production and meets the requirements for a galvanic separation between antenna and device, an adaptation of antenna and device and a free choice of antenna rod length in a surprisingly simple manner.
Claims (10)
- Rotating antenna having a bearing (L) and counterweight (G), in particular for a communications device, characterised in that the bearing (L) is constructed in the form of a capacitive rotary joint which is matched to the antenna impedance and the impedance of the antenna feeder (SL) and is arranged between the antenna rod (AS) and the antenna feeder (SL).
- Antenna according to Claim 1, characterised in that the antenna rod (AS) has a long and a short antenna rod part (AS1, AS2) which are connected to one another via a crossjoint (KG), and in that for the purpose of ensuring the solid angle set on the long antenna rod part (AS1) the bearing (L) serves as a friction clutch for the short antenna rod part (AS2).
- Antenna according to Claim 2, characterized in that the bearing (L) has a bearing shell (LS) which is made from non-conductive material and encloses the short antenna rod part (AS2), and a holder (H) which is made from conductive material and clamps the bearing shell (LS) on a support (A).
- Antenna according to Claim 3, characterized in that the bearing shell (LS) is designed on the side facing the short antenna rod part (AS2), at least in subsections of the circumferential surface, in a mirror-inverted fashion with respect to the surface shape of the short antenna rod part (AS2), in that the bearing shell (LS) has in the edge region on the side averted from the short antenna rod part (AS2) at least one collar (LB1, LB2) running around the short antenna rod part (AS2), and in that the bearing shell (LS) has on the side facing the short antenna rod part (AS2) a projection (LE) running around the short antenna rod part (AS2), the collar (LB1, LB2) acting from the electrical point of view as a leakage path.
- Antenna according to Claim 4, characterized in that the bearing shell (LS) is designed as a half shell or as a sleeve.
- Antenna according to Claim 3, characterised in that the holder (H) is configured on the side facing the bearing shell (LS) in a mirror-inverted fashion with respect to the surface shape thereof with retaining angles (H1, H2) which are arranged at the two free ends and are offset in height with respect to one another, one retaining angle (H1) gripping a recess (AU) in the support (A) from behind, and it being possible to clamp the other retaining angle (H2) on the support (A) by means of a screw (S).
- Antenna according to Claim 4, characterized in that the projection (LE) is constructed in the form of a nose which engages in an annular groove (RN) of the short antenna rod part (AS2).
- Antenna according to Claim 1, characterized in that the counterweight (G) is configured in the form of a stripline, the stripline being designed in a u-shaped or meandering fashion for matching to the antenna impedance and the impedance of the antenna feeder (SL), and the matching being determined essentially by the distance and length of the U-limb or by the shape of the meandering stripline and by the stripline width.
- Antenna according to Claim 1, characterized in that the antenna rod length is selected such that the antenna impedance and the impedances of the rotary joint, counterweight (G) and antenna feeder (SL) are matched to the self-impedance of the communications device.
- Antenna according to Claims 1 and 8, characterised in that the rotary joint and the counterweight (G) are fastened in the communications device to a rotatably mounted support (A).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT89108666T ATE92215T1 (en) | 1988-05-26 | 1989-05-13 | ROTATING ANTENNA WITH BEARING AND COUNTERWEIGHT. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3817844A DE3817844A1 (en) | 1988-05-26 | 1988-05-26 | ROTATING ANTENNA WITH BEARING AND COUNTERWEIGHT |
| DE3817844 | 1988-05-26 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0343465A2 EP0343465A2 (en) | 1989-11-29 |
| EP0343465A3 EP0343465A3 (en) | 1990-11-07 |
| EP0343465B1 true EP0343465B1 (en) | 1993-07-28 |
Family
ID=6355141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89108666A Expired - Lifetime EP0343465B1 (en) | 1988-05-26 | 1989-05-13 | Rotatable antenna with a bearing and a counterweight |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0343465B1 (en) |
| AT (1) | ATE92215T1 (en) |
| DE (2) | DE3817844A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2253949B (en) * | 1991-03-16 | 1995-08-09 | Antenna Products Ltd | Radio Antennas |
| US5874921A (en) * | 1996-09-20 | 1999-02-23 | Ericsson, Inc. | Antenna impedance matching network requiring no switch contacts |
| DE10160688A1 (en) | 2001-12-11 | 2003-06-18 | Endress & Hauser Gmbh & Co Kg | Device for determining and / or monitoring the level of a product in a container |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1358598A (en) * | 1963-03-07 | 1964-04-17 | Improvements to electric radio antennas | |
| JPS58162104A (en) * | 1982-03-23 | 1983-09-26 | Matsushita Electric Ind Co Ltd | Rod antenna holding device |
| JPS60107903A (en) * | 1983-11-16 | 1985-06-13 | General Res Obu Erekutoronitsukusu:Kk | Antenna device |
| US4764773A (en) * | 1985-07-30 | 1988-08-16 | Larsen Electronics, Inc. | Mobile antenna and through-the-glass impedance matched feed system |
-
1988
- 1988-05-26 DE DE3817844A patent/DE3817844A1/en not_active Withdrawn
-
1989
- 1989-05-13 DE DE8989108666T patent/DE58905017D1/en not_active Expired - Fee Related
- 1989-05-13 EP EP89108666A patent/EP0343465B1/en not_active Expired - Lifetime
- 1989-05-13 AT AT89108666T patent/ATE92215T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| ATE92215T1 (en) | 1993-08-15 |
| DE58905017D1 (en) | 1993-09-02 |
| EP0343465A2 (en) | 1989-11-29 |
| EP0343465A3 (en) | 1990-11-07 |
| DE3817844A1 (en) | 1989-12-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE68923598T2 (en) | Extendable antenna for portable, cellular radiotelephones. | |
| DE69220469T2 (en) | Auxiliary antenna | |
| EP1337001B1 (en) | Device for contactless transmission of electrical signals and /or energy | |
| DE3833288C2 (en) | MULTI-BAND ROD ANTENNA FOR MOTOR VEHICLES | |
| DE69924443T2 (en) | Inverted F antenna with switchable impedance | |
| DE19720773B4 (en) | Double resonance frequency antenna device | |
| DE19649682C2 (en) | Device for broadband signal or energy transmission between mutually movable units | |
| EP0204886B1 (en) | Antenna for a radio transmitting and receiving apparatus | |
| EP3355419B1 (en) | Connector for connecting a waveguide with at least one electric conductor | |
| DE3437829C1 (en) | Electrical connector, in particular for telecommunications distributors | |
| DE69531442T2 (en) | Retractable antenna with a load at the top | |
| EP0343465B1 (en) | Rotatable antenna with a bearing and a counterweight | |
| DE19800937B4 (en) | Antenna adapter for the detachable connection of a third-party antenna to a radio transmitter and receiver | |
| DE102004031580A1 (en) | Arrangement for contact-free inductive transfer of electrical power to a mobile user includes an extended primary conduction system and a mobile device moving relative to it with a secondary winding coupled to primary conduction system | |
| DE102005042341A1 (en) | Antenna arrangement for GSM and UTMS signals reception and transmission, has several resonance frequency zones and PIFA-antenna | |
| DE10321429B4 (en) | Antenna coupler for mobile terminals | |
| EP0520197B1 (en) | Foil antenna | |
| DE2146962A1 (en) | Directional coupler | |
| DE69932013T2 (en) | ANTENNA FOR MOBILE RADIO COMMUNICATION | |
| DE19547191C2 (en) | Antenna for walkie-talkie | |
| WO2002103840A1 (en) | Antenna coupler | |
| WO2002039547A1 (en) | Inverted-f antenna | |
| DE19858090A1 (en) | Double band aerial with multi-turn coil | |
| EP1101253B1 (en) | Antenna with a large bandwidth | |
| EP0398181B1 (en) | Apparatus for the transmission of an optical signal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT CH DE FR GB LI SE |
|
| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
| AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT CH DE FR GB LI SE |
|
| 17P | Request for examination filed |
Effective date: 19901005 |
|
| 17Q | First examination report despatched |
Effective date: 19921221 |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT CH DE FR GB LI SE |
|
| REF | Corresponds to: |
Ref document number: 92215 Country of ref document: AT Date of ref document: 19930815 Kind code of ref document: T |
|
| GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 19930730 |
|
| REF | Corresponds to: |
Ref document number: 58905017 Country of ref document: DE Date of ref document: 19930902 |
|
| ET | Fr: translation filed | ||
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: 746 Effective date: 19940614 |
|
| 26N | No opposition filed | ||
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: DL |
|
| EAL | Se: european patent in force in sweden |
Ref document number: 89108666.2 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19950929 Year of fee payment: 7 |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PFA Free format text: GRUNDIG E.M.V. ELEKTRO- MECHANISCHE VERSUCHSANSTALT MAX GRUNDIG GMBH & CO. KG |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19960514 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: CD |
|
| EUG | Se: european patent has lapsed |
Ref document number: 89108666.2 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19970506 Year of fee payment: 9 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 19970512 Year of fee payment: 9 |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PFA Free format text: GRUNDIG E.M.V. ELEKTRO- MECHANISCHE VERSUCHSANSTALT MAX GRUNDIG GMBH & CO. KG TRANSFER- GRUNDIG AG |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19970530 Year of fee payment: 9 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 19970531 Year of fee payment: 9 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19970630 Year of fee payment: 9 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: TP |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19980513 Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19980513 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19980531 Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19980531 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19980531 |
|
| GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19980513 |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990302 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |