DE2525487C2 - Straight dipole or unipole antenna - Google Patents
Straight dipole or unipole antennaInfo
- Publication number
- DE2525487C2 DE2525487C2 DE19752525487 DE2525487A DE2525487C2 DE 2525487 C2 DE2525487 C2 DE 2525487C2 DE 19752525487 DE19752525487 DE 19752525487 DE 2525487 A DE2525487 A DE 2525487A DE 2525487 C2 DE2525487 C2 DE 2525487C2
- Authority
- DE
- Germany
- Prior art keywords
- dipole
- resonance frequency
- unipole antenna
- resonant circuit
- antenna
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
- H01Q9/18—Vertical disposition of the antenna
Landscapes
- Details Of Aerials (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Description
Hierzu 1 Blatt Zeichnungen1 sheet of drawings
Die Erfindung betrifft eine geradt Dipol- oder Unipolantenne der im Oberbegriff des Patentanspruchs angegebenen ArtThe invention relates to a straight dipole or unipole antenna of the type specified in the preamble of the claim
Die Nachteile bekannter Breitbanddipole für niedere Frequenzen bestehen hauptsächlich in einer Frequenzabhängigkeit der Stromverteilung, die eine Frequenzabhängigkeit des Erhebungsdiagramms zur Folge hat, in der Aufnahme horizontaler Feldkomponenten durch die Dachkapazität sowie in einer immer noch erheblichen Frequenzabhängigkeit des Fußpunktwiderstandes.The disadvantages of known broadband dipoles for low frequencies are mainly a frequency dependence the current distribution, which results in a frequency dependency of the survey diagram, in the inclusion of horizontal field components through the roof capacity as well as in a still considerable Frequency dependence of the base point resistance.
Der Erfindung liegt die Aufgabe zugrunde, eine breitbandige Antenne der im Oberbegriff des Patentanspruchs 1 angegebenen Art, deren Stromverteilung — und damit auch deren Erhebungsdiagramm — sowie Anschlußwiderstand weitestgehend frequenzabhängig sind.The invention is based on the object of providing a broadband antenna as described in the preamble of claim 1, its current distribution - and thus also its survey diagram - as well as Terminal resistance are largely frequency-dependent.
Die erfindungsgemäße Lösung dieser Aufgabe ist im Kennzeichen des Patentanspruchs üngegeben.The inventive solution to this problem is indicated in the characterizing part of the claim.
Es ist z. B. aus ELECTRONiCS LETTERS, Vol. 10, No, 22, S.462/463 bekannt, daß man — wie in Fi g. la dargestellt — einen gewöhnlichen Unipolstrahler 1, derIt is Z. B. from ELECTRONiCS LETTERS, Vol. 10, No, 22, p.462 / 463 known that - as in Fi g. la shown - an ordinary Unipol heater 1, the
auf-angepaßt ist, bei Erniedrigung der Betriebsfrequenz durch Einfügen einer geeigneten Verlängerungsinduktivität 4 wieder auf die neue Frequenz anpassen kann. Wird die Betriebsfrequenz erhöht, muß zur Anpassung nach F i g. 1 b eine Verkürzungskapazität eingefügt werden. Wollte man eine solche Antenne breitbandig gestalten, so müßte der Wert L der Verlängerungsinduktivität 4 den in Fig.2 skizzierten Verlauf haben, d. h. sie müßte beispielsweise am oberen Frequenzende ωο negativ sein, dem unteren Frequenzende cou zu aber ansteigen, insgesamt also einen negativen Gradienten aufweisen. Derartiges läßt sich mit gewöhnlichen passiven Schaltelementen nur in kleinen Frequenzbereichen, d. h. für relativ schmale Bandbreiten, realisieren.is on-adapted, can adapt to the new frequency again when the operating frequency is lowered by inserting a suitable extension inductance 4. If the operating frequency is increased, the adaptation according to FIG. 1 b a shortening capacity can be inserted. If one were to make such an antenna broadband, so the value of L should the extension inductance 4 have outlined in Fig.2 history, ie had to, for example, at the upper frequency end ω be ο negative, the low frequency end co u rise to but for a total of a negative Have gradients. Such a thing can only be achieved with conventional passive switching elements in small frequency ranges, ie for relatively narrow bandwidths.
Die Erfindung basiert auf der Erkenntnis, daß die Reaktanz XfIZeines einfachen Dipols, deren Frequenzabhängigkeit in F i g. 3a dargestellt ist, mit der Reaktanz X eines Reaktanzzweipols mit Gleichstromsperre etwa übereinstimmt (Fig. 3b). Durch Vorzeichenumkehr mittels bereits verfügbarer Negativ-Impedanz-Wandler (negative-impedance-converter: NIC) erhält man aus realen Raktanzzweipolen einen Reaktanzverlauf nach e>o F i g. 3c, mit dem man die Reaktanz des Dispols durch Reihenschaltung kompensieren kann.The invention is based on the knowledge that the reactance XfIZ of a simple dipole, the frequency dependence of which is shown in FIG. 3a is shown, with the reactance X of a reactance dipole with direct current block approximately coincides (Fig. 3b). By reversing the sign by means of negative impedance converters (negative impedance converters: NIC) that are already available, a reactance curve according to e> o FIG. 3c, with which the reactance of the Dispol can be compensated by series connection.
Ein günstiges Ausführungsbeispiel zeigt F i g. 4. Ein Dipol 1 wird über Anschlüsse 2 gespeist oder an einen Empfänger angeschlossen. Unmittelbar vor der Speise- b5 stelle 3 ist in den Dipol ein Zweipol eingefügt, bestehend aus einem mit in Serie geschalteter Kapazität 6 und Induktivität 7 abgeschlossenen Negativ-Impedanz-A favorable embodiment is shown in FIG. 4. A dipole 1 is fed via connections 2 or to one Receiver connected. Immediately in front of the feed b5 point 3, a two-pole connection is inserted into the dipole from a negative impedance terminated with capacitance 6 and inductance 7 connected in series
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19752525487 DE2525487C2 (en) | 1975-06-07 | 1975-06-07 | Straight dipole or unipole antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19752525487 DE2525487C2 (en) | 1975-06-07 | 1975-06-07 | Straight dipole or unipole antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE2525487A1 DE2525487A1 (en) | 1976-12-23 |
| DE2525487C2 true DE2525487C2 (en) | 1984-08-23 |
Family
ID=5948555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19752525487 Expired DE2525487C2 (en) | 1975-06-07 | 1975-06-07 | Straight dipole or unipole antenna |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE2525487C2 (en) |
-
1975
- 1975-06-07 DE DE19752525487 patent/DE2525487C2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2525487A1 (en) | 1976-12-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8120 | Willingness to grant licences paragraph 23 | ||
| 8110 | Request for examination paragraph 44 | ||
| D2 | Grant after examination | ||
| 8364 | No opposition during term of opposition | ||
| 8339 | Ceased/non-payment of the annual fee | ||
| 8327 | Change in the person/name/address of the patent owner |
Owner name: TELEFUNKEN SYSTEMTECHNIK GMBH, 7900 ULM, DE |