FR2497000A2 - Wide frequency band car aerial - has cylindrical mounting holding aerial and enclosing ferrite transformer for connection - Google Patents
Wide frequency band car aerial - has cylindrical mounting holding aerial and enclosing ferrite transformer for connection Download PDFInfo
- Publication number
- FR2497000A2 FR2497000A2 FR8026881A FR8026881A FR2497000A2 FR 2497000 A2 FR2497000 A2 FR 2497000A2 FR 8026881 A FR8026881 A FR 8026881A FR 8026881 A FR8026881 A FR 8026881A FR 2497000 A2 FR2497000 A2 FR 2497000A2
- Authority
- FR
- France
- Prior art keywords
- whip
- antenna according
- impedance
- aerial
- sleeve
- 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.)
- Pending
Links
Classifications
-
- 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
-
- 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
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
Landscapes
- Details Of Aerials (AREA)
Abstract
Description
La présente invention concerne un perfectionnement aux antennes dites à fouet" ; elle se rapporte plus spécialement à des antennes de ce type, de petite longueur, à coefficient d'amplification augmenté dans une largeur de bande de fréquence radio de plus d'une octave, sans charge résistante à large bande, ni d'accord de bande étroite. The present invention relates to an improvement to so-called whip antennas; it relates more particularly to antennas of this type, of short length, with increased amplification coefficient in a radio frequency bandwidth of more than one octave, without heavy broadband load, or narrow band tuning.
Dans la demande de brevet principal n076 14566, on décrit une antenne de type sus-indiqué, dans laquelle le dispositif de positionnement comprend un manchon isolant électriquement, qui entoure l'espace entre I'extré- mité inférieure du fouet et la base conductrice de l'en- semble. Le manchon, prévu dans ce brevet principal, remonte le point d'alimentation de l'antenne d'une certaine longueur au-dessus du plan de la masse, pour y augmenter la résistance au rayonnement, sans modifier la résistance antirésonante au rayonnement. In main patent application No. 76 14566, an antenna of the above-mentioned type is described, in which the positioning device comprises an electrically insulating sleeve, which surrounds the space between the lower end of the whip and the conductive base of all. The sleeve, provided in this main patent, raises the feed point of the antenna a certain length above the ground plane, to increase the resistance to radiation there, without modifying the anti-resonant resistance to radiation.
La présente invention résulte de la constatation inattendue que le manchon sus-mentionné peut être avantageusement en une matière électriquement conductrice, à condition d'tre convenablement isolée du fouet lui-mtme. The present invention results from the unexpected observation that the aforementioned sleeve can advantageously be made of an electrically conductive material, provided that it is suitably isolated from the whip itself.
L'antenne, suivant la présente première addition, est donc semblable à celle qui est décrite et représentée dans le brevet principal nO 7,6 14566, mais carac térisée en ce que le manchon (repère 16) entourant l'es- pace entre I'extrdmité inférieure du fouet (12) et la masse (18) est conducteur, ce manchon étant isolé de fa çon appropriée (16c) du fouet. The antenna, according to the present first addition, is therefore similar to that which is described and represented in the main patent No. 7.6 14566, but charac terized in that the sleeve (item 16) surrounding the space between I 'lower end of the whip (12) and the mass (18) is conductive, this sleeve being appropriately insulated (16c) from the whip.
Les dessins annexés illustrent schématiquement l'antenne suivant l'invention et certains circuits s'y rapportant. The accompanying drawings schematically illustrate the antenna according to the invention and certain circuits relating thereto.
Fig. 1 est une vue en élévation et en coupe d'une antenne fouet à large bande et à alimentation par transformateur, conforme à l'invention. Fig. 1 is an elevational and sectional view of a wideband whip antenna with transformer supply, according to the invention.
Fig. 2 est un schéma de l'antenne et d'un transformateur d'équilibrage à ferrite, conforme à 1' invention. Fig. 2 is a diagram of the antenna and a ferrite balancing transformer according to the invention.
Fig. 3 est un schéma représentant le circuit équivalent de l'antenne fouet à large bande à alimentation par transformateur à ferrite, qui facilite la compréhension du fonctionnement de l'antenne. Fig. 3 is a diagram showing the equivalent circuit of the wideband whip antenna supplied by a ferrite transformer, which facilitates the understanding of the operation of the antenna.
Fig. 4 représente schématiquement un arrangement à dipole à coefficient d'amplification augmenté, qui utilise deux antennes fouet à large bande, et
Fig. 5 représente schématiquement un arrangement à double dipole utilisant quatre antennes fouet à large bande, pour un coefficient d'amplification encore plus grand.Fig. 4 schematically represents a dipole arrangement with increased amplification coefficient, which uses two broadband whip antennas, and
Fig. 5 schematically represents a double dipole arrangement using four broadband whip antennas, for an even greater amplification coefficient.
La figure 1 représente une antenne 10 à large bande, du type fouet, à alimentation par transformateur à ferrite, conforme à l'invention, dont la partie 12 formant fouet est constituée par un cylindre en matière conductrice ayant une longueur LA, d'une extrémité à l'autre. FIG. 1 represents a broadband antenna 10, of the whip type, supplied by a ferrite transformer, according to the invention, the part 12 of which forms a whip and is constituted by a cylinder of conductive material having a length LA, of a end to end.
Une partie périphérique du fouet, adjacente vers l'intérieur à une première extrémité 12a du fouet, est encapsulée par une bride 14, en matière isolante pour les radiofréquences. La bride 14 est conçue pour s'adapter à des moyens de fixation appropriés et être maintenue par ces derniers, qui sont par exemple sous forme de filetages 15 associés, formés sur la périphérie extérieure d'une première extrémité 16a d'un manchon 16 sensiblement cylindrique, formant base, réalisé en matière conductrice de 1' électricité ; ce manchon, avantageusement métallique, est convenablement isolé du fouet 12 et de la bague de contact 20, au moyen d'une bague 16c, en matière isolante pour les radio-fréquences. Le manchon de base 16 et le fouet 12 sont assemblés en alignement axial, leur axe commun de rotation étant en général placé dans un plan vertical.L' extrémité inférieure 16b du manchon conducteur peut être logée, sans jeu, dans l'aldsage du second manchon 17, de longueur axiale LB. L'extrémité inférieure du second manchon 17 est fixée à une plaque de masse 18, qui peut d- tre par exemple la carrosserie métallique d'un véhicule.A peripheral part of the whip, adjacent inwardly at a first end 12a of the whip, is encapsulated by a flange 14, made of an insulating material for radio frequencies. The flange 14 is designed to adapt to and be maintained by suitable fixing means, which are for example in the form of associated threads 15, formed on the outer periphery of a first end 16a of a sleeve 16 substantially cylindrical, forming base, made of electrically conductive material; this sleeve, advantageously metallic, is suitably insulated from the whip 12 and the contact ring 20, by means of a ring 16c, made of an insulating material for radio frequencies. The base sleeve 16 and the whip 12 are assembled in axial alignment, their common axis of rotation being generally placed in a vertical plane. The lower end 16b of the conductive sleeve can be accommodated, without play, in the aldsage of the second sleeve 17, of axial length LB. The lower end of the second sleeve 17 is fixed to a ground plate 18, which may for example be the metal body of a vehicle.
Cependant, si le manchon de base, métallique, 16, présente une épaisseur suffisante, son renforcement à l'aide du manchon 17 devientinutile t un bon contact électrique est alors établi entre la base du manchon 16 et la plaque de masse 18.However, if the basic metal sleeve 16 has a sufficient thickness, its reinforcement using the sleeve 17 becomes useless t good electrical contact is then established between the base of the sleeve 16 and the ground plate 18.
La disposition du transformateur d'équilibrage 22 et des autres circuits est la mOme que celle qui a fait l'objet des pages 4 à 10 et des figures 2 à 5 du brevet principal, on notera, cependant, au sujet de la figure 3, qu'étant donné la nature conductrice du manchon 16, la capacitance résiduelle CA de l'antenne comprend une capacitance marginale, additionnelle ; 1' inductance de fuite i du transformateur à ferrite 22 doit etre prévue de façon à compenser cette capacitance additionnelle, dont une valeur typique a été trouvée comme se situant aux environs de 8 picofarads. The arrangement of the balancing transformer 22 and of the other circuits is the same as that which was the subject of pages 4 to 10 and of figures 2 to 5 of the main patent, it will be noted, however, with regard to FIG. 3, that given the conductive nature of the sleeve 16, the residual capacitance CA of the antenna comprises an additional marginal capacitance; 1 leakage inductance i of the ferrite transformer 22 must be provided in order to compensate for this additional capacitance, a typical value of which has been found to be around 8 picofarads.
Claims (11)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8026881A FR2497000A2 (en) | 1975-08-18 | 1980-12-18 | Wide frequency band car aerial - has cylindrical mounting holding aerial and enclosing ferrite transformer for connection |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/605,338 US4028704A (en) | 1975-08-18 | 1975-08-18 | Broadband ferrite transformer-fed whip antenna |
FR8026881A FR2497000A2 (en) | 1975-08-18 | 1980-12-18 | Wide frequency band car aerial - has cylindrical mounting holding aerial and enclosing ferrite transformer for connection |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2497000A2 true FR2497000A2 (en) | 1982-06-25 |
Family
ID=26222134
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8026881A Pending FR2497000A2 (en) | 1975-08-18 | 1980-12-18 | Wide frequency band car aerial - has cylindrical mounting holding aerial and enclosing ferrite transformer for connection |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2497000A2 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB535055A (en) * | 1939-07-24 | 1941-03-27 | Gen Electric Co Ltd | Improvements in and relating to short wave wireless aerials |
FR1278799A (en) * | 1959-12-16 | 1961-12-15 | Egen Electric Ltd | Antenna coupling device |
DE1791128A1 (en) * | 1968-09-18 | 1971-11-04 | Wolfgang Freitag | Device for connecting a radio receiver for motor vehicles with the receiving antenna |
FR2321780A1 (en) * | 1975-08-18 | 1977-03-18 | Beam Systems Israel Ltd | WIDE BAND FREQUENCY ANTENNA |
US4128840A (en) * | 1977-01-10 | 1978-12-05 | William Tucker | Resonant re-entrant cavity whip antenna |
US4224625A (en) * | 1979-04-24 | 1980-09-23 | Elbit Computers Ltd. | Antenna |
-
1980
- 1980-12-18 FR FR8026881A patent/FR2497000A2/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB535055A (en) * | 1939-07-24 | 1941-03-27 | Gen Electric Co Ltd | Improvements in and relating to short wave wireless aerials |
FR1278799A (en) * | 1959-12-16 | 1961-12-15 | Egen Electric Ltd | Antenna coupling device |
DE1791128A1 (en) * | 1968-09-18 | 1971-11-04 | Wolfgang Freitag | Device for connecting a radio receiver for motor vehicles with the receiving antenna |
FR2321780A1 (en) * | 1975-08-18 | 1977-03-18 | Beam Systems Israel Ltd | WIDE BAND FREQUENCY ANTENNA |
US4128840A (en) * | 1977-01-10 | 1978-12-05 | William Tucker | Resonant re-entrant cavity whip antenna |
US4224625A (en) * | 1979-04-24 | 1980-09-23 | Elbit Computers Ltd. | Antenna |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4280129A (en) | Variable mutual transductance tuned antenna | |
US4080604A (en) | Means for tuning a loaded coil antenna | |
KR101177393B1 (en) | Low profile, broad band monopole antenna with heat dissipating ferrite/powder iron network and method for constructing the same | |
US4935746A (en) | Efficiency monitoring antenna | |
US4200874A (en) | Car antenna mounting means | |
US4319248A (en) | Integrated spiral antenna-detector device | |
US9379441B2 (en) | Very wide band tactical vehicular antenna system | |
EP2422403B1 (en) | Multiple wide band antenna with low profile | |
FR2597266A1 (en) | BROADBAND ANTENNA | |
US5926149A (en) | Coaxial antenna | |
US3267476A (en) | Vehicle-mounted half wave antenna with impedance matching transformer | |
US3950757A (en) | Broadband whip antennas | |
US20050243012A1 (en) | Multiple bands type antenna and method for producing the same | |
US4635068A (en) | Double-tuned disc loaded monopole | |
US7852283B2 (en) | Rod antenna device | |
US4092646A (en) | Flexible antenna with capacative plate coupling | |
FR2497000A2 (en) | Wide frequency band car aerial - has cylindrical mounting holding aerial and enclosing ferrite transformer for connection | |
US5579023A (en) | Rotatable antenna and integral, shielded impedance matching network | |
GB2196483A (en) | Antenna | |
US10170841B1 (en) | Dual mode slotted monopole antenna | |
US5883600A (en) | Tuneable antenna | |
US2834961A (en) | Aircraft antenna with impedance matching device | |
US2748387A (en) | Antenna structure | |
US3404404A (en) | Combined dipole and linear antenna with balun | |
US2485930A (en) | Connector |