FR2545281A1 - Method and device for automatically tracking the tuning of an HF loop antenna - Google Patents
Method and device for automatically tracking the tuning of an HF loop antenna Download PDFInfo
- Publication number
- FR2545281A1 FR2545281A1 FR8306949A FR8306949A FR2545281A1 FR 2545281 A1 FR2545281 A1 FR 2545281A1 FR 8306949 A FR8306949 A FR 8306949A FR 8306949 A FR8306949 A FR 8306949A FR 2545281 A1 FR2545281 A1 FR 2545281A1
- Authority
- FR
- France
- Prior art keywords
- value
- loop antenna
- motor
- coaxial
- voltage
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/005—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with variable reactance for tuning the antenna
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/04—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant in circuits having distributed constants, e.g. having very long conductors or involving high frequencies
- G01R27/06—Measuring reflection coefficients; Measuring standing-wave ratio
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/38—Impedance-matching networks
- H03H7/40—Automatic matching of load impedance to source impedance
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
Description
L'invention concerne des perfectionnements à une antenne boucle HF accordée à l'aide d'un condensateur variable. The invention relates to improvements to an HF loop antenna tuned using a variable capacitor.
Elle s'applique en particulier à une antenne destinée aux liaisons dans la gamme HF avec une puissance pouvant atteindre 1 kw. It applies in particular to an antenna intended for links in the HF range with a power of up to 1 kw.
Avec ce type d'antenne très sélective, la moindre variation dimensionnelle due à l'effet de la température cause un déplacement de l'accord et rend nécessaire une modification de la capacité du condensateur pour rétablir l'accord. With this type of very selective antenna, the slightest dimensional variation due to the effect of temperature causes a shift in the tuning and makes it necessary to modify the capacitance of the capacitor to restore the tuning.
Une des solutions connues consiste à détecter le champ de l'antenne dans l'axe de l'antenne
En cas de désaccord, la valeur du champ n'est pas nulle et on utilise cette valeur comme signal pour commander une modification de la valeur de la capacité du condensateur dans un sens visant à annuler le champ, un champ nul signifiant que l'antenne est accordée.One of the known solutions consists in detecting the field of the antenna in the axis of the antenna.
In case of disagreement, the value of the field is not zero and this value is used as a signal to control a modification of the value of the capacitance of the capacitor in a direction aimed at canceling the field, a zero field signifying that the antenna is granted.
Cette solution présente entre autres l'inconvénient que le capteur de champ est trop sensible aux champs électromagnétiques environnants, dus par exemple à d'autres antennes, ce qui fausse les mesures. Among other things, this solution has the drawback that the field sensor is too sensitive to the surrounding electromagnetic fields, due for example to other antennas, which falsifies the measurements.
La présente invention vise à fournir une autre solution affranchie de cet inconvénient. The present invention aims to provide another solution overcome this drawback.
Selon l'invention, on mesure la valeur du rapport
VR/VA de deux tensions représentatives respectivement de la tension de l'onde retour et la tension de l'onde aller dans le conducteur coaxial qui alimente l'antenne et on commande la variation de la capacité du condensateur de façon à maintenir cette valeur minimale.According to the invention, the value of the ratio is measured
VR / VA of two voltages respectively representative of the return wave voltage and the go wave voltage in the coaxial conductor which supplies the antenna and the variation of the capacitor capacity is controlled so as to maintain this minimum value .
On pourrait faire l'accord sur le minimum de la tension VR mais ce minimum varie indépendamment de l'adaptation quand le niveau de puissance varie, aussi préfère-t-on faire l'accord sur le minimum du rapport VR/VA car dans ce cas l'accord est indépendant de la puissance. We could agree on the minimum of the VR voltage but this minimum varies independently of the adaptation when the power level varies, so we prefer to agree on the minimum of the VR / VA ratio because in this case the agreement is independent of power.
La figure 1 du dessin joint représente schématiquement un exemple d'antenne boucle, et
la figure 2 illustre schématiquement un dispositif pour la mise en oeuvre du procddz de l'inyention,
La figure 1 représente une antenne boucle constituée de deux bras verticaux 1,2, par exemple des tubes creux, fixés à un pied métallique 3 qui sert de support. Les deux bras 1,2, qui constituent la boucle rayonnante sont réunis au sommet par un condensateur variable schématisé en 4 logé dans un cylindre isolant 5.FIG. 1 of the attached drawing schematically represents an example of a loop antenna, and
FIG. 2 schematically illustrates a device for the implementation of the invention procedure,
Figure 1 shows a loop antenna consisting of two vertical arms 1,2, for example hollow tubes, fixed to a metal leg 3 which serves as a support. The two arms 1,2 which constitute the radiating loop are joined at the top by a variable capacitor shown diagrammatically at 4 housed in an insulating cylinder 5.
Cette antenne est attaquée par l'intermédiaire de deux demi-boucles secondaires 6,7 et d'un symétriseur 16 alimenté par un câble coaxial 8 logé dans le pied. La variation du condensateur est commandée par un moteur 9 logé dans le cylindre.This antenna is attacked by means of two secondary half-loops 6,7 and a balun 16 provided by a coaxial cable 8 housed in the foot. The variation of the capacitor is controlled by a motor 9 housed in the cylinder.
Le dispositif préconisé par l'invention (figure 2) comprend un coupleur directif 10 inséré sur le câble coaxial 8. Ce coupleur est relié à un diviseur 11 qui reçoit après détection une tension VA et une tension VR, respectivement représentatives de la tension de l'onde aller et de la tension de l'onde retour dans le coaxial. Le diviseur fournit un signal de sortie représentatif de la valeur du rapport VR/VA et l'envoie par une liaison appropriee schématisée en 14 à un bloc de commande 15 qui agit sur la commande du moteur 9 dans le sens qui convient pour maintenir minimale la valeur du rapport. The device recommended by the invention (Figure 2) comprises a directional coupler 10 inserted on the coaxial cable 8. This coupler is connected to a divider 11 which receives after detection a voltage VA and a voltage VR, respectively representative of the voltage of l wave and the return wave voltage in the coaxial. The divider provides an output signal representative of the value of the VR / VA ratio and sends it by an appropriate link shown diagrammatically at 14 to a control block 15 which acts on the control of the motor 9 in the direction which is suitable for keeping the value of the report.
I1 n'est pas nécessaire de décrire en détails le coup leur directif qui est un moyen connu pour dissocier une onde aller et une onde retour dans un coaxial HF. It is not necessary to describe in detail the blow their direction which is a known means for dissociating a go wave and a return wave in an HF coaxial.
Dans cet exemple, la boucle formée par les deux bras est sensiblement carrée : cette forme n'est pas limitative et l'on peut, en variante, utiliser une boucle circulaire, comme décrit par exemple dans le brevet US 3 588905, ou d'autres formes. In this example, the loop formed by the two arms is substantially square: this shape is not limiting and one can, as a variant, use a circular loop, as described for example in US Pat. No. 3,588,905, or other forms.
Dans cet exemple, la boucle principàle est attaquée par deux demi-boucles secondaires : cette disposition n'est pas limitative et l'on peut en variante utiliser une seule boucle secondaire, par exemple une boucle secondaire circulaire, comme décrit dans le brevet US 3 588 905 déj cité. In this example, the main loop is attacked by two secondary half-loops: this arrangement is not limiting and one can alternatively use a single secondary loop, for example a circular secondary loop, as described in US patent 3 588 905 already cited.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8306949A FR2545281B1 (en) | 1983-04-27 | 1983-04-27 | METHOD AND DEVICE FOR AUTOMATIC TRACKING OF A HF LOOP ANTENNA |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8306949A FR2545281B1 (en) | 1983-04-27 | 1983-04-27 | METHOD AND DEVICE FOR AUTOMATIC TRACKING OF A HF LOOP ANTENNA |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2545281A1 true FR2545281A1 (en) | 1984-11-02 |
FR2545281B1 FR2545281B1 (en) | 1986-03-14 |
Family
ID=9288289
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8306949A Expired FR2545281B1 (en) | 1983-04-27 | 1983-04-27 | METHOD AND DEVICE FOR AUTOMATIC TRACKING OF A HF LOOP ANTENNA |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2545281B1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007006975A2 (en) * | 2005-07-12 | 2007-01-18 | Pygmalyon | Loop-type electronic antenna |
RU188485U1 (en) * | 2018-06-07 | 2019-04-16 | Павел Аркадьевич Владимиров | SMALL-SIZE SHORT-WAVE ANTEN FIDER DEVICE "MRV" |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3588905A (en) * | 1967-10-05 | 1971-06-28 | John H Dunlavy Jr | Wide range tunable transmitting loop antenna |
US3601717A (en) * | 1969-11-20 | 1971-08-24 | Gen Dynamics Corp | System for automatically matching a radio frequency power output circuit to a load |
US4209758A (en) * | 1977-06-22 | 1980-06-24 | Patelhold Patentverwertungs- & Elektro-Holding Ag | Method and apparatus for the automatic matching of a transmitter to an antenna |
-
1983
- 1983-04-27 FR FR8306949A patent/FR2545281B1/en not_active Expired
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3588905A (en) * | 1967-10-05 | 1971-06-28 | John H Dunlavy Jr | Wide range tunable transmitting loop antenna |
US3601717A (en) * | 1969-11-20 | 1971-08-24 | Gen Dynamics Corp | System for automatically matching a radio frequency power output circuit to a load |
US4209758A (en) * | 1977-06-22 | 1980-06-24 | Patelhold Patentverwertungs- & Elektro-Holding Ag | Method and apparatus for the automatic matching of a transmitter to an antenna |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007006975A2 (en) * | 2005-07-12 | 2007-01-18 | Pygmalyon | Loop-type electronic antenna |
FR2888673A1 (en) * | 2005-07-12 | 2007-01-19 | Pygmalyon Sa | ELECTRONIC LOOP TYPE ANTENNA |
WO2007006975A3 (en) * | 2005-07-12 | 2007-03-01 | Pygmalyon | Loop-type electronic antenna |
RU188485U1 (en) * | 2018-06-07 | 2019-04-16 | Павел Аркадьевич Владимиров | SMALL-SIZE SHORT-WAVE ANTEN FIDER DEVICE "MRV" |
Also Published As
Publication number | Publication date |
---|---|
FR2545281B1 (en) | 1986-03-14 |
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