EP2287966B1 - Antenna rod for a rod antenna for multiple wireless services - Google Patents
Antenna rod for a rod antenna for multiple wireless services Download PDFInfo
- Publication number
- EP2287966B1 EP2287966B1 EP10171466.5A EP10171466A EP2287966B1 EP 2287966 B1 EP2287966 B1 EP 2287966B1 EP 10171466 A EP10171466 A EP 10171466A EP 2287966 B1 EP2287966 B1 EP 2287966B1
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- EP
- European Patent Office
- Prior art keywords
- rod
- antenna
- plastic
- antenna coil
- low
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- 239000004033 plastic Substances 0.000 claims description 50
- 229920003023 plastic Polymers 0.000 claims description 50
- 230000008878 coupling Effects 0.000 claims description 46
- 238000010168 coupling process Methods 0.000 claims description 46
- 238000005859 coupling reaction Methods 0.000 claims description 46
- 239000004020 conductor Substances 0.000 claims description 39
- 239000012212 insulator Substances 0.000 claims description 28
- 239000000463 material Substances 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 7
- 239000011152 fibreglass Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 5
- 230000003068 static effect Effects 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 claims 2
- 241000209035 Ilex Species 0.000 description 5
- 230000005855 radiation Effects 0.000 description 3
- 241001295925 Gegenes Species 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000006223 plastic coating Substances 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
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- 238000005476 soldering Methods 0.000 description 1
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Images
Classifications
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- 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
- H01Q1/3275—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/362—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith for broadside radiating helical antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
- H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
- H01Q11/08—Helical antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/32—Vertical arrangement of element
Definitions
- Another antenna rod is known, for example, as a short-rod antenna from the DE102004053354A1 , in particular for radio reception in motor vehicles.
- the antenna rod is mounted on a plastic part and forms the RF emitter. It is envisaged to carry out the helix with differentiated pitch, in order to use the shank in addition to the frequencies of the radio broadcasting also for the operation in the frequencies of the mobile radio in the 900 MHz as well as in the 1.8 GHz range.
- the height of such antennas is of particular importance. They are preferably used on the roof of the motor vehicle and, if the length is too great, constitute an obstacle, in particular in the case of parking garages with a low overall height and so-called double parkers.
- the radiator bandwidth of electrically short rod antennas increases approximately with the cube of the length of the antenna rod relative to the free space wavelength of the operating frequency.
- this law especially in the frequency range of the FM radio with the bandwidth of about 20 MHz in conjunction with the already low in this frequency range ambient noise a particular difficulty in the design of very short Rod antennas.
- Antennas according to the cited prior art usually have a length of 40 cm. Add to that Demand for the lowest possible manufacturability of such antenna rods, which are subject to a particularly high cost pressure in vehicle technology.
- the object of the invention is therefore to provide an antenna rod, which on the one hand in the frequency range of VHF radio provides the smallest possible length as large as possible reception voltage and also allows operation in the radio services with higher frequency and a particularly cost-effective production.
- Fig. 1a shows a substantially vertical antenna rod 1 for a rod antenna assembly on a vehicle body 12, which serves as a mass 29 of the rod antenna assembly.
- the antenna rod 1 includes a plastic rod 7, on which an antenna coil 2 is applied.
- the coupling conductor 4 is performed in coverage 9 of several, but at least two turns of the coil 2 via an interposed low-loss insulator 10 over the length of the cover 9 to the antenna coil 2 galvanically separated, so that over this length a capacitive coupling to the antennas -Wendel 2 is given.
- the coupling conductor 4, the low-loss insulator 10 and the antenna rod are mechanically fixed to each other and at the lower end of the coupling conductor 4 it is equipped with an electro-mechanical connecting element 14 for connection to the electro-mechanical base terminal 5.
- An antenna rod 1 of this type is usually connected to the electro-mechanical base terminal 5 of a low and on the vehicle body 12 fixed plastic base member 3, which includes the further antenna circuit 6, which is connected to the electromechanical base terminal 5.
- Such an antenna rod has over the prior art the advantage that by combining the capacitive coupling of the coupling conductor 4 via the low-loss insulator 10 to the antenna coil 2 over the length of the cover 9, an increase in the receiving voltage of the antenna rod 1 in the VHF Frequency range is achievable.
- this occurs caused by the capacitive coupling of the coupling conductor 4, over several turns to the antenna coil 2, a much larger active component of the impedance 33, as he with a simple antenna coil without the measures with respect to the wavelength
- This increased radiation resistance is advantageously increased in a wide frequency range around the passage of the impedance 33 in the frequency point of the low-impedance resonance, whereby an increase in the receiving voltage is given with a relatively large frequency bandwidth.
- the length of the cover 9 is chosen to be 5 cm and should generally be at least 2 cm and not more than 6 cm. With a total of about 200 turns of constant pitch, an overlap 9 of about 60 turns has been found to be useful. Furthermore, it proves to be further appropriate to make the static capacitance between the coupling conductor 4 and the antenna coil 2 sufficiently large and not smaller than 3pF.
- the tuning of the antenna rod is advantageously to be carried out in such a way that the low-resistance resonance in the frequency range between 75 MHz and 110 MHz occurs.
- An essential advantage associated with the present invention in the low-effort production of the antenna rod results from the fixed mechanical connection between the coupling conductor 4, the low-loss insulator 10 and the antenna rod.
- the coupling conductor 4 is equipped at its lower end with an electromechanical connecting element 14. According to the invention, there is thus no galvanically conductive connection between the antenna helix 2 and the connection to the continuing antenna circuit 6.
- the antenna coil 2 supporting plastic rod 7 can thus be produced, for example, endless, separated into appropriate lengths and completely encased with an insulating material and - without soldering - for example by gluing with the coupling conductor be added to the antenna rod 1.
- Fig. 1b shows the perspective view of an antenna rod 1, which is designed substantially with a rectangular cross-section.
- For capacitive coupling of the coupling conductor 4 is advantageously designed as a flat band conductor.
- Fig. 1c the longitudinal section of the antenna rod 1 with representation of the electro-mechanical connecting element 14 with a fixed electrical connection to the coupling conductor 4 is shown.
- a particular advantage of an antenna rod 1 is its particular suitability for the low-effort design for multiple radio services.
- the antenna rod 1 is designed for a rod antenna arrangement for the additional reception of VHF broadcast signals.
- the antenna rod 1 connected to the electro-mechanical base terminal 5 of the plastic base part 3, as in connection with the Fig. 1a is described, and the electro-mechanical base terminal 5 is a parallel resonant circuit 35 with the parallel resonant frequency between 120 MHz and 160 MHz, as in Fig. 1d shown, connected downstream, so the vote of the antenna rod 1 and the parallel resonant circuit 35 are each designed in such a way that the measurable between the free end of the parallel resonant circuit 35 and the ground 29 impedance 33 in the Figure 3 has shown frequency profile.
- the impedance 33 in the frequency range between 75 MHz and 110 MHz for the function in the FM frequency range, a first low-impedance resonance and in the Frequency range between 175 MHz and 240 MHz for the function in the VHF frequency range passes through a second low-impedance resonance.
- Antennenstabil 13 of h 15 cm and less are for the reception of the FM and VHF radio band in an advantageous embodiment of the invention
- the diameter, the pitch of the turns and the diameter of the wire-shaped conductor 11 of the antenna coil. 2 matched in the following special way. This tuning takes place in such a way that when a series connection of a capacitance and an inductance is inserted between the base terminal 5 and the ground 29, the impedance measured in parallel to the inductance passes through a low-impedance resonance in the frequency range between 190 MHz and 230 MHz.
- the inductance is advantageous in the way to choose that when using this circuit in the continuing antenna circuit 6 in both the frequency range of FM broadcasting and VHF broadcasting when connecting an FM / VHF antenna amplifier with input side high-impedance field effect transistor parallel to the inductor each gives the necessary bandwidth in these frequency ranges.
- the capacity for the propagation of the signals in these frequency ranges sufficiently, however, on the other hand not too large to choose when connecting an AM amplifier with input side high-impedance field effect transistor at the input of the AM amplifier between the base terminal 5 and the ground 29, these signals not too much to weaken.
- Favorable values for such a capacity are between 5pF and 20pF; favorable values for the inductance are between 500nH and 1500nH.
- the coupling conductor 4 is designed for the design of an antenna rod 1 for a rod antenna arrangement for the reception of AM / FM / VHF and a radio service in the L-band.
- the length of the coupling conductor 15 for the reception of a radio service in the L-frequency band is selected to be 1 ⁇ 4 of the free space wavelength of the frequency of the radio service.
- the necessary for the vote of the antenna coil 2 low slope
- the wire helix leads to a high-impedance structure in the frequency range of the L-frequency band, which barely influences the radiation behavior of the coupling conductor 4 designed as an L-band radiator.
- Such an advantageously designed antenna rod 1 allows for corresponding broadband design of the above-mentioned FM / VHF antenna amplifier as FMNHF / L-band amplifier, the inclusion of the broadcast band in the L-band frequency.
- the antenna rod 1 thus designed enables the reception of all the broadcast bands AM, FM, VHF and L-band in the above-mentioned advantageous small antenna rod length 13.
- this coupling coil 32 can be applied, for example, made of wire to a tubular body, which is pushed over the antenna coil 2.
- the increase in the bandwidth results from the formation of the loop in the complex impedance plane, which can be achieved by the appropriate coordination of the two helices 2 and 32 with respect to the geometry of the two turns together with the dielectric properties of the materials.
- the spiral cover 34 - this is the length over which the antenna coil 2 is covered by the coupling coil 32 - should not fall below 1/4 of the antenna coil 2.
- the sleeve is lined in an exemplary embodiment in its inner boundary with an electrically insulating plastic sheath as a low-loss insulator 10.
- the latter comprises positively locking the introduced into the electrically conductive sleeve 16 with plastic sheath, the antenna coil 2 supporting plastic rod 7 at least over the length of the cover 9.
- the electrically conductive sleeve 16 includes at its lower end the electro-mechanical connecting element 14 for connection to the electro-mechanical base terminal 5 of the plastic base part.
- FIG. 6a In a further advantageous embodiment of the invention are - as in FIG. 6a represented - the antenna coil 2 supporting plastic rod 7 and the electrically conductive sleeve 16 each designed with a circular cross-section.
- the low-loss insulator 10 is formed by an insulator sleeve 22, the latter being positively inserted into the electrically conductive sleeve 16 and in which turn the antenna coil 2 supporting plastic rod 7 at least over the length of the cover 9 at its lower end is introduced positively.
- the tubular insulator 21 is formed in the interior of the electrically conductive sleeve 16, wherein at the lower end of an insulating disc 24 is inserted to avoid a galvanic contact between the antenna coil 2 and the electrically conductive sleeve 16. If, for structural reasons, a very thin wall thickness of the tubular insulator 21 is required, the pipe wall can be provided with apertures for reducing the coupling capacity for a given dielectric constant of the insulator material.
- FIG. 6b represents - the antenna coil 2 supporting plastic rod 7 made of a highly elastic rod 26 with a substantially circular cross-section made of fiberglass reinforced plastic to form the restoring force.
- the diameter of the plastic rod 7 should not be chosen smaller than 2 mm.
- the low-loss insulator 10 is as in FIG. 6c represented by the dielectrically low-loss insulating selected material 27 for the plastic protective casing 25 itself formed.
- the diameter of the electrically conductive sleeve 16 is chosen to be correspondingly larger than the diameter of the antenna helix 2 supporting plastic rod 7. This is introduced during manufacture in the electrically conductive sleeve 16 that the low-loss insulator 10 by inflow of the dielectric low-loss insulating material 27 between the electrically conductive sleeve 16 and the antenna coil 2 supporting plastic rod 7 is formed.
- the encapsulation of the antenna rod 1 with the protective plastic coating 25 and the production of the low-loss insulator 10 can be carried out advantageously in one operation.
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- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Details Of Aerials (AREA)
Description
Ein weiterer Antennenstab ist zum Beispiel bekannt als Kurzstab-Antenne aus der
Die Strahlerbandbreite elektrisch kurzer Stabantennen wächst etwa mit der dritten Potenz der auf die Freiraumwellenlänge der Betriebsfrequenz bezogenen Länge des Antennenstabs. Im Gegensatz zu den Verhältnissen, die im Frequenzbereich des AM-Hörrundfunks vorliegen, stellt diese Gesetzmäßigkeit insbesondere im Frequenzbereich des UKW-Hörrundfunks mit der Bandbreite von circa 20 MHz in Verbindung mit dem in diesem Frequenzbereich bereits niedrigem Umgebungsrauschen eine besondere Schwierigkeit bei der Gestaltung sehr kurzer Stabantennen dar. Antennen nach dem genannten Stand der Technik besitzen in der Regel eine Länge von 40cm. Hinzu kommt die Forderung nach einer möglichst kostengünstigen Herstellbarkeit solcher Antennenstäbe, die in der Fahrzeugtechnik einem besonders hohen Kostendruck unterliegen.The radiator bandwidth of electrically short rod antennas increases approximately with the cube of the length of the antenna rod relative to the free space wavelength of the operating frequency. In contrast to the conditions that exist in the frequency range of AM-Hörrundfunk, this law, especially in the frequency range of the FM radio with the bandwidth of about 20 MHz in conjunction with the already low in this frequency range ambient noise a particular difficulty in the design of very short Rod antennas. Antennas according to the cited prior art usually have a length of 40 cm. Add to that Demand for the lowest possible manufacturability of such antenna rods, which are subject to a particularly high cost pressure in vehicle technology.
Aufgabe der Erfindung ist es deshalb, einen Antennenstab anzugeben, welcher einerseits im Frequenzbereich des UKW-Hörrundfunks eine bei möglichst kleiner Länge möglichst große Empfangsspannung liefert und ebenso den Betrieb bei den Funkdiensten mit höherer Frequenz sowie eine besonders kostengünstige Herstellung ermöglicht.The object of the invention is therefore to provide an antenna rod, which on the one hand in the frequency range of VHF radio provides the smallest possible length as large as possible reception voltage and also allows operation in the radio services with higher frequency and a particularly cost-effective production.
Diese Aufgabe wird erfindungsgemäß durch die im kennzeichnenden Teil des Hauptanspruchs angegebenen Merkmale gelöst.This object is achieved by the features stated in the characterizing part of the main claim.
Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden im Folgenden näher beschrieben. Im einzelnen zeigt:
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Fig. 1a : Antennenstab 1 (nicht beansprucht) mit gestrecktem elektrisch leitendem Element alsKoppelleiter 4 zur elektromagnetischen Ankopplung an die Antennen-Wendel 2 über denverlustarmen Isolator 10 über die Länge derÜberdeckung 9 zur Erhöhung der Empfangsspannung des Antennenstabs 1 im UKW-Frequenzbereich -
Fig. 1b : Perspektivische Darstellung des im Wesentlichen mit rechteckförmigem Querschnitt gestalteten Antennenstabs 1 mit als Bandleitergestaltetem Koppelleiter 4 -
Fig. 1c : Längsschnitt durch den Antennenstab 1 mit Darstellung des elektro-mechanischen Verbindungselements 14 in fester elektrischer Verbindung mit demKoppelleiter 4 -
Fig. 1d : Antennenstab 1 wie inFigur 1a jedoch mitParallelschwingkreis 35 zur Messung derImpedanz 33 mit zwei niederohmigen Resonanzstellen -
Fig. 2 : Gegen die Masse 29 gemessener Verlauf derImpedanz 33 des an den elektro-mechanischen Basisanschluss 5 angeschlossenen Antennenstabs 1 im Frequenzbereich zwischen 87 MHz und 108 MHz mit niederohmiger Resonanz bei 95,3 MHz. Der Antennenstab 1 ist auf den Frequenzbereich des UKW-Hörrundfunks abgestimmt. -
Fig. 3 : Am einen Ende eines mit seinem anderen Ende an den elektro-mechanischen Basisanschluss 5 angeschlossenen Parallelschwingkreises 35 - wie inFigur 1d - mit der Parallel-Resonanzfrequenz zwischen 120 MHz und 160 MHz gegen die Masse 29 gemessener Verlauf derImpedanz 33. Der Antennenstab 1 und derParallelschwingkreis 35 sind in der Weise aufeinander abgestimmt, dass eine erste niederohmige Resonanz im UKW-Frequenzbereich und eine zweite im VHF- Bereich auftritt -
Fig.4 :- a) Antenne nach der Erfindung mit einer zusätzlichen Koppel-
Wendel 32 zur Vergrößerung der Bandbreite. Bei geeigneter Dimensionierung ist ein Impedanzverlauf entsprechend einem Zwei-Kreis-Resonanzbandfilter erreichbar. Hierzu sollte die Wendel-Überdeckung 34 ¼ der Länge derAntennenwendel 2 nicht unterschreiten - b) Impedanzverlauf eines nach
Fig. 4a gestalteten Antennenstabs 1 nach der Erfindung}
- a) Antenne nach der Erfindung mit einer zusätzlichen Koppel-
-
Fig. 5 : Antennenstab 1 wie inFigur 1 , wobei jedoch derKoppelleiter 4 als elektrischleitende Hülse 16 mit elektro-mechanischem Basisanschluss 5 gestaltetet ist, in welche der die Antennen-Wendel 2 tragende Kunststoff-Stab 7 mit der Länge derÜberdeckung 9 eingeschoben ist. Die mechanisch feste Verbindung zwischen derHülse 16 und dem Kunststoff-Stab 7 ist über den rohrförmig gestaltetenverlustarmen Isolator 10 gegeben -
Fig. 6a :- a) Antennenstab 1 wie in
Figur 5 , jedoch mit einem als Hülse gestaltetenverlustarmen Isolator 10 und einem aus einemelastischen Stabkern 17 mit Stabkern-Ummantelung 18 aus weicherem Kunststoff und der Kunststoff-Schutzummantelung 25 gestaltetem Kunststoff-Stab 7 - b) Antennenstab 1 wie in
Figur 5 , jedoch mit einem Kunststoff-Stab 7 aus Glasfaser verstärktem Kunststoff mit rundem Querschnitt, auf welchem derdrahtförmige Leiter 11 der Antennen-Wendel 2 aufgebracht ist. Zwischen dem verlustarmen, rohrförmigen Isolator 21 und der elektrischleitenden Hülse 16 ist dieIsolierscheibe 24 eingefügt. 7 - c) Antennenstab 1 wie in
Figur 6a , wobei jedoch derverlustarme Isolator 10 durch das dielektrisch verlustarm isolierend gewählte Material 27 für die Kunststoff-Schutzummantelung 25 durch Einfließen dieses Materials 27 zwischen die elektrischleitende Hülse 16 und den die Antennen-Wendel 2 tragenden Kunststoff-Stab 7 bei der Umspritzung des Antennenstabs mit der Kunststoff-Schutzummantelung 25 gebildet ist
- a) Antennenstab 1 wie in
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Fig. 1a : An antenna rod 1 (not claimed) with a stretched electrically conductive element as acoupling conductor 4 for electromagnetic coupling to theantenna coil 2 via the low-loss insulator 10 over the length of thecover 9 to increase the receiving voltage of the antenna rod 1 in the VHF frequency range -
Fig. 1b : Perspective view of the antenna rod 1, which is designed substantially with a rectangular cross section and has acoupling conductor 4 designed as a strip conductor -
Fig. 3 shows a longitudinal section through the antenna rod 1, showing the electro-mechanical connecting1c element 14 in fixed electrical connection with thecoupling conductor 4 -
Fig. 1d : Antenna rod 1 as inFIG. 1a However, with parallelresonant circuit 35 for measuring theimpedance 33 with two low-impedance resonance points -
Fig. 2 : Measured against the mass 29 course of theimpedance 33 of the connected to the electro-mechanical base terminal 5 antenna rod 1 in the frequency range between 87 MHz and 108 MHz with low-impedance resonance at 95.3 MHz. The antenna rod 1 is tuned to the frequency range of the VHF radio. -
Fig. 3 At one end of a parallelresonant circuit 35 connected at its other end to the electro-mechanical base connection 5 - as in FIGFigure 1d - With the parallel resonant frequency between 120 MHz and 160 MHz against the ground 29 measured course of theimpedance 33. The antenna rod 1 and the parallelresonant circuit 35 are matched in such a way that a first low-impedance resonance in the FM frequency range and a second in the VHF - area occurs -
Figure 4 :- a) antenna according to the invention with an
additional coupling coil 32 to increase the bandwidth. With suitable dimensioning, an impedance curve corresponding to a two-loop resonant band filter can be achieved. For this purpose, thespiral cover 34 ¼ of the length of theantenna coil 2 should not fall below - b) impedance curve of an after
Fig. 4a designed antenna rod 1 according to the invention}
- a) antenna according to the invention with an
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Fig. 5 : Antenna rod 1 as inFIG. 1 However, wherein thecoupling conductor 4 is designed as an electricallyconductive sleeve 16 with electro-mechanical base terminal 5, in which theantenna coil 2 supportingplastic rod 7 is inserted with the length of thecover 9. The mechanically strong connection between thesleeve 16 and theplastic rod 7 is given over the tubular shaped low-loss insulator 10 -
Fig. 6a :- a) antenna rod 1 as in
FIG. 5 , but with a designed as a sleeve low-loss insulator 10 and a made of anelastic rod core 17 with rod core sheath 18 made of softer plastic and the plastic protective sheath 25 designed plastic rod. 7 - b) antenna rod 1 as in
FIG. 5 , but with aplastic rod 7 made of fiberglass reinforced plastic with a round cross section, on which the wire-shaped conductor 11 of theantenna coil 2 is applied. Between the low-loss, tubular insulator 21 and the electricallyconductive sleeve 16, the insulatingdisk 24 is inserted. 7 - c) antenna rod 1 as in
FIG. 6a However, wherein the low-loss insulator 10 by the dielectrically low-loss insulating selected material 27 is formed for the plastic protective jacket 25 by inflow of this material 27 between the electricallyconductive sleeve 16 and theantenna coil 2 supportingplastic rod 7 in the encapsulation of the antenna rod with the plastic protective coating 25
- a) antenna rod 1 as in
Ein besonderer Vorteil eines Antennenstabs 1 ist seine besondere Eignung für die aufwandsarme Gestaltung für mehrere Funkdienste.A particular advantage of an antenna rod 1 is its particular suitability for the low-effort design for multiple radio services.
Eine mit der vorliegenden Erfindung erreichbare vorteilhafte Anhebung der Empfangsspannung im UKW-Frequenzbereich kann vorteilhaft ebenso genützt werden, wenn der Antennenstab 1 für eine Stabantennen-Anordnung für den zusätzlichen Empfang von VHF-Rundfunksignalen gestaltet ist. Ist der Antennenstab 1 mit dem elektro-mechanischen Basisanschluss 5 des Kunststoff-Basisteils 3 verbunden, wie im Zusammenhang mit der
Hierfür ist es erforderlich, dass die Impedanz 33 im Frequenzbereich zwischen 75 MHz und 110 MHz für die Funktion im UKW-Frequenzbereich eine erste niederohmige Resonanz und im Frequenzbereich zwischen 175 MHz und 240 MHz für die Funktion im VHF- Frequenzbereich eine zweite niederohmige Resonanz durchläuft.For this it is necessary that the
Insbesondere bei sehr kleiner Antennenstablänge 13 von h = 15 cm und weniger sind für den Empfang des FM- und des VHF-Rundfunkbandes in einer vorteilhaften Ausgestaltung der Erfindung der Durchmesser, die Steigung der Windungen und der Durchmesser des drahtförmigen Leiters 11 der Antennen-Wendel 2 auf folgende besondere Weise aufeinander abgestimmt. Diese Abstimmung erfolgt derart, dass bei Einfügung einer Serienschaltung aus einer Kapazität und einer Induktivität zwischen dem Basisanschluss 5 und der Masse 29 die parallel zur Induktivität gemessene Impedanz im Frequenzbereich zwischen 190 MHz und 230MHz eine niederohmige Resonanz durchläuft. Dabei ist die Induktivität vorteilhaft in der Weise zu wählen, dass sich bei Einsatz dieser Beschaltung in der weiterführenden Antennenschaltung 6 sowohl im Frequenzbereich des FM-Rundfunks als auch des VHF-Rundfunks bei Anschluss eines FM/VHF-Antennenverstärkers mit eingangsseitig hochohmigem Feldeffekttransistor parallel zur Induktivität jeweils die notwendige Bandbreite in diesen Frequenzbereichen ergibt. Hierfür ist die Kapazität für die Fortleitung der Signale in diesen Frequenzbereichen hinreichend jedoch andererseits nicht zu groß wählen, um bei Anschluss eines AM-Verstärkers mit eingangsseitig hochohmigem Feldeffekttransistor am Eingang des AM-Verstärkers zwischen dem Basisanschluss 5 und der Masse 29 diese Signale nicht zu sehr zu schwächen. Günstige Werte für eine derartige Kapazität liegen zwischen 5pF und 20pF; günstige Werte für die Induktivität liegen zwischen 500nH und 1500nH.In particular, with very
In einer weiteren vorteilhaften Ausgestaltung der Erfindung ist der Koppelleiter 4 zur Gestaltung eines Antennenstabs 1 für eine Stabantennen-Anordnung für den Empfang von AM/FM/VHF- und einen Funkdienst im L-Band ausgebildet. Die Länge des Koppelleiters 15 für den Empfang eines Funkdienstes im L-Frequenzband ist etwa ¼ der Freiraum-Wellenlänge der Frequenz des Funkdienstes gewählt. Die für die Abstimmung der Antennen-Wendel 2 notwendige geringe Steigung der Drahtwendel führt zu einer im Frequenzbereich des L-Frequenzbandes hochohmigen Struktur, welche das Strahlungsverhalten des als L-Bandstrahlers ausgebildeten Koppelleiters 4 kaum beeinflusst. Ein derart vorteilhaft ausgestalteter Antennenstab 1 ermöglicht bei entsprechend breitbandiger Gestaltung des oben genannten FM/VHF-Antennenverstärkers als FMNHF/L-Band-Verstärker die Einbeziehung des Rundfunkbandes im L-Frequenzband. Durch frequenzselektive Zusammenführung der Ausgangssignale des FM/VHF/L-Band-Verstärkers und des AM-Verstärkers in der weiterführenden Antennenschaltung 6 ermöglicht der auf diese Weise gestaltete Antennenstab 1 den Empfang sämtlicher Rundfunkbänder AM, FM, VHF und L-Band bei der genannten vorteilhaft kleinen Antennenstablänge 13.In a further advantageous embodiment of the invention, the
Im Interesse einer größeren Bandbreite des gegen die Masse 29 gemessenen Frequenzverlaufs der Impedanz 33 des an den elektromechanischen Basisanschluss 5 angeschlossenen Antennenstabs 1 im Frequenzbereich des UKW-Rundfunks ist - wie in
Erfindungsgemäß ist der Koppelleiter 4 - wie in
In einer weiteren vorteilhaften Ausgestaltung der Erfindung sind - wie in
In
In einer weiteren vorteilhaften Ausgestaltung der Erfindung ist - wie ebenfalls in
In einer für die Herstellung besonders vorteilhaften Ausführungsform eines Antennenstabs 1 ist der verlustarme Isolator 10 - wie in
Claims (14)
- An antenna rod (1) for a rod antenna arrangement, wherein:- the antenna rod (1) includes a plastic rod (7) on which an antenna coil (2) is applied;- an elongated electrically conductive element as a coupling conductor (4) for the electromagnetic coupling to the antenna coil (2) is guided at the lower end of the plastic rod (7) and in parallel with its rod axis (8) with a coverage (9) of at least two windings of the antenna coil (2);- the coupling conductor (4) is galvanically separated from the antenna coil (2) by a low-loss insulator (10) such that a capacitive coupling to the antenna coil (2) is present;- the coupling conductor (4), the low-loss insulator (10) and the antenna rod are mechanically fixedly connected to one another; and- the coupling conductor (4) is equipped with an electromechanical connection element (14) at its lower end,characterized in that
the coupling conductor (4) is configured as an electrically conductive sleeve (16) which is lined in its inner boundary with an electrically insulating plastic jacket as a low-loss insulator (10) which comprises the plastic rod (7) in a shape-matched manner at least over the length of the coverage (9), said plastic rod supporting the antenna coil (2) and being inserted into the electrically conductive sleeve (16) comprising the plastic jacket; and in that the electrically conductive sleeve (16) includes the electromechanical connection element (14) at its lower end. - An antenna rod (1) for a rod antenna arrangement in accordance with claim 1 for the reception of AM/of FM,
characterized by the following features- the antenna rod length (13) is shorter than 45 cm,- the antenna coil (2) is adapted from a wire-like conductor (11) wound onto the plastic rod (7) at a substantially constant pitch;- the diameter, the pitch of the windings and the diameter of the wire-like conductor (11) of the antenna coil (2) are coordinated with one another for the function in the USW range in such a manner that the impedance of the antenna rod (1) measured against ground (29) experiences a low-ohm resonance in a frequency range between 75 MHz and 120 MHz; and- the coverage (9) is selected as at least 2 cm and at most 6 cm and the low-loss insulator (10) mechanically connecting the coupling conductor (4) to the antenna rod (1) is selected in such a manner that the static capacitance between the coupling conductor (4) and the antenna coil (2) amounts to at least 3 pF. - An antenna rod (1) for a rod antenna arrangement in accordance with claim 2 for the reception of AM radio/of FM radio and for VHF radio,
characterized in that
a parallel resonant circuit having a parallel resonant frequency between 120 MHz and 160 MHz is, however, provided at an input of a furthergoing antenna circuit (6) whose one terminal is connected to the electromechanical connection element (14); in that the diameter, the pitch of the windings and the diameter of the wire-like conductor (11) of the antenna coil (2) are coordinated with one another in such a manner that the impedance measured against ground (29) at the other terminal of the parallel resonant circuit experiences a first low-ohm resonance in the frequency range between 75 MHz and 110 MHz for the function in the USW frequency range and experiences a second low-ohm resonance in the frequency range between 175 MHz and 240 MHz for the function in the VHF frequency range. - An antenna rod (1) for a rod antenna arrangement in accordance with claim 3 for the reception of AM band/of FM band/of VHF band and for a radio service in the L band,
characterized in that
the length of the coupling conductor (15) amounts to approximately [1/4] of the free-space wavelength of the frequency of the radio service for the reception of a radio service in the L frequency band. - An antenna rod (1) for a rod antenna arrangement in accordance with claim 2 for the reception of AM/of FM and for a radio service in the L band,
characterized in that
the length of the coupling conductor (15) amounts to approximately [1/4] of the free-space wavelength of the frequency of the radio service for the reception of a radio service in the L frequency band. - An antenna rod (1) in accordance with claim 1,
characterized in that
the plastic rod (7) supporting the antenna coil (2) and the electrically conductive sleeve (16) are each designed with circular cross-sections and an insulator sleeve (22) having a minimum length of the coverage (9) is present, into which insulator sleeve the plastic rod (7) supporting the antenna coil (2) is inserted in a shape-matched manner at its lower end and said antenna coil is, in turn, inserted in a shape-matched manner into the electrically conductive sleeve (16). - An antenna rod (1) in accordance with claim 6,
characterized in that
a tubular insulator (21) is, however, used instead of the insulator sleeve (22) and an insulating disk (24) is present in the interior of the electrically conductive sleeve (16) at the lower end thereof to avoid a galvanic contact between the antenna coil (2) and the electrically conductive sleeve (16). - An antenna rod (1) in accordance with claims 1 to 7,
characterized in that
the plastic rod (7) supporting the antenna coil (2) comprises a highly elastic rod (26) having a substantially round cross-section of glass fiber-reinforced plastic to form a return force, the diameter of said plastic rod being selected as at least 2 mm and the antenna coil (2) being applied thereon. - An antenna rod (1) in accordance with claims 1 to 8,
characterized in that
the plastic rod (7) supporting the antenna coil (2) comprises a highly elastic rod (26) of glass fiber-reinforced plastic having small cross-sectional dimensions to form a return force, which plastic rod is surrounded by a stable-core jacket (17) from a softer material (27) which insulates in a dielectrically low-loss manner to form a suitable cross-section for the application of the antenna coil (2). - An antenna rod (1) in accordance with claims 1 to 9,
characterized in that
the plastic rod (7) supporting the antenna coil (2) is surrounded by a plastic protective jacket (25) for the mechanical protection of the antenna coil (2). - An antenna rod (1) in accordance with claim 10,
characterized in that
the low-loss insulator (10) is, however, formed by the selected material (27), which insulates in a dielectrically low-loss manner, for the plastic protective jacket (25), with the diameter of the electrically conductive sleeve (16) being selected correspondingly larger than the diameter of the plastic rod (7) supporting the antenna coil (2) and said plastic rod being inserted into the electrically conductive sleeve (16) in manufacture such that the low-loss insulator (10) is formed by the inflow of the material (27) which insulates in a dielectrically low-loss manner between the electrically conductive sleeve (16) and the plastic rod (7) supporting the antenna coil (2) on the overmolding of the antenna rod with the plastic protective jacket (25). - An antenna rod (1) in accordance with claim 9,
characterized in that
the antenna rod (1) has a round cross-section and the antenna rod length (13) amounts to approximately 150 mm; the diameter of the highly elastic rod (26) of glass fiber-reinforced plastic amounts to approximately 2 to 3 mm; the diameter of the rod-core jacket (18) amounts to approximately 4 to 8 mm; and the coverage (9) and the length of the coupling conductor (15) amount to approximately 30 to 50 mm. - An antenna rod (1) in accordance with claim 1,
characterized in that,
for the electromagnetic coupling to the antenna coil (2), a coupling coil (32) is present at the plastic rod (7), covers the antenna coil (2) with a coil coverage (34) of at least 1/4 of the length of the antenna coil (2) and is galvanically separate therefrom and both coils (2, 32) are coordinated with one another in such a manner that the frequency progression, measured against ground (29), of the impedance of the antenna rod (1) connected to the electromechanical base terminal (5) forms a broadband loop in the complex impedance plane in the frequency range of USW radio and thus corresponds to the frequency progression of a double-circuit resonant bandpass filter. - An antenna rod (1) for a rod antenna arrangement in accordance with claim 4 for the reception of the AM radio band/of the FM radio band and of the VHF radio band and for the reception of a broadcasting service in the L band,
characterized in that
a capacitor having a capacitance value between 5 pF and 20 pF is, however, present and its first terminal is connected to the electromechanical base terminal (5) and an inductance having an inductance value between 500 nH and 1500 nH is connected between a second terminal of the capacitor and ground (29); and in that the diameter, the pitch of the windings and the diameter of the wire-like conductor (11) of the antenna coil (2) are coordinated with one another in such a manner that the impedance measured in parallel with the inductance experiences a low-ohm resonance in the frequency range between 190 MHz and 230 MHz.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009037722A DE102009037722A1 (en) | 2009-08-17 | 2009-08-17 | Antenna rod for a rod antenna for several radio services |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2287966A1 EP2287966A1 (en) | 2011-02-23 |
EP2287966B1 true EP2287966B1 (en) | 2018-05-30 |
Family
ID=43303241
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10171466.5A Active EP2287966B1 (en) | 2009-08-17 | 2010-07-30 | Antenna rod for a rod antenna for multiple wireless services |
Country Status (3)
Country | Link |
---|---|
US (1) | US8610631B2 (en) |
EP (1) | EP2287966B1 (en) |
DE (1) | DE102009037722A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009037722A1 (en) * | 2009-08-17 | 2011-02-24 | Heinz Prof. Dr.-Ing. Lindenmeier | Antenna rod for a rod antenna for several radio services |
DE102012003460A1 (en) | 2011-03-15 | 2012-09-20 | Heinz Lindenmeier | Multiband receiving antenna for the combined reception of satellite signals and terrestrial broadcasting signals |
KR101246855B1 (en) * | 2011-04-27 | 2013-03-25 | 인팩일렉스 주식회사 | Dual band antenna for vehicle |
TWM424630U (en) * | 2011-08-31 | 2012-03-11 | Mascot Electric Co Ltd | Antenna device |
JP6010412B2 (en) * | 2012-09-26 | 2016-10-19 | 株式会社ヨコオ | Antenna device |
JP6334313B2 (en) * | 2014-08-19 | 2018-05-30 | 株式会社ヨコオ | Composite antenna and manufacturing method thereof |
CN108321527A (en) * | 2017-12-29 | 2018-07-24 | 浙江联品电子科技有限公司 | A kind of frequency modulation broadcasting transmitting antenna being easily installed |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10242740A (en) * | 1997-02-26 | 1998-09-11 | Nippon Antenna Co Ltd | Multi-resonance antenna |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4137534A (en) * | 1977-05-26 | 1979-01-30 | Goodnight Roy G | Vertical antenna with low angle of radiation |
FI106895B (en) * | 1996-02-16 | 2001-04-30 | Filtronic Lk Oy | A combined structure of a helix antenna and a dielectric disk |
SE9902878L (en) * | 1999-08-11 | 2001-03-05 | Allgon Ab | Compact multi-band antenna |
US6714164B2 (en) * | 2001-02-26 | 2004-03-30 | Nippon Antena Kabushiki Kaisha | Multifrequency antenna |
GB2400497B (en) * | 2003-04-07 | 2007-03-21 | Harada Ind | Multi-band antenna and connectable communication circuitry,for vehicular application |
GB2410837B (en) * | 2004-02-06 | 2007-05-23 | Harada Ind Co Ltd | Multi-band antenna using parasitic element |
DE102004053354B4 (en) | 2004-09-06 | 2021-01-21 | Delphi Technologies, Inc. | Short rod antenna |
DE102006055022A1 (en) * | 2006-11-22 | 2008-05-29 | Hirschmann Car Communication Gmbh | Rod antenna with sections of different antenna windings |
DE102009037722A1 (en) * | 2009-08-17 | 2011-02-24 | Heinz Prof. Dr.-Ing. Lindenmeier | Antenna rod for a rod antenna for several radio services |
-
2009
- 2009-08-17 DE DE102009037722A patent/DE102009037722A1/en not_active Withdrawn
-
2010
- 2010-07-30 EP EP10171466.5A patent/EP2287966B1/en active Active
- 2010-08-15 US US12/856,676 patent/US8610631B2/en active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10242740A (en) * | 1997-02-26 | 1998-09-11 | Nippon Antenna Co Ltd | Multi-resonance antenna |
Also Published As
Publication number | Publication date |
---|---|
DE102009037722A1 (en) | 2011-02-24 |
US20110193755A1 (en) | 2011-08-11 |
EP2287966A1 (en) | 2011-02-23 |
US8610631B2 (en) | 2013-12-17 |
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