CH248656A - Broadband antenna for very short waves, with at least one radiator arranged in front of a metal mirror. - Google Patents
Broadband antenna for very short waves, with at least one radiator arranged in front of a metal mirror.Info
- Publication number
- CH248656A CH248656A CH248656DA CH248656A CH 248656 A CH248656 A CH 248656A CH 248656D A CH248656D A CH 248656DA CH 248656 A CH248656 A CH 248656A
- Authority
- CH
- Switzerland
- Prior art keywords
- metal mirror
- radiator
- broadband antenna
- short waves
- strip
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
- H01Q19/108—Combination of a dipole with a plane reflecting surface
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
- H01Q19/12—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave
- H01Q19/13—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave the primary radiating source being a single radiating element, e.g. a dipole, a slot, a waveguide termination
Landscapes
- Aerials With Secondary Devices (AREA)
Description
Breitbandantenne für sehr kurze Wellen, mit mindestens einem vor einem Metallspiegel angeordneten Strahler. Es ist bereits bekannt, zur Übertrabgung breiter Frequenzbänder des Ultrakurzwellen- bezw. Dezimeterwellenbereiches Antennen grossen Querschnittes zu verwenden, z. B.
Strahler in Form sehr dicker Rohre. Ferner sind, wie Fig. la und 1b in zwei zuein ander senkrechten Ebenen zeigen, streifen- förmige Dipole vorgeschlagen worden, die vor einer spiegelnden, vorzugsweise ebenen, Metallplatte im Abstand von angenähert R/4 parallel zu dieser angeordnet sind und an ihrem dem Speisepunkt abgekehrten Ende in der Breite verjüngt, also zugespitzt sind.
Es ist nicht möglich, durch Vergrösserung des. Verhältnisses der Breite<I>d</I> zur Länge<I>l</I> über etwa 0,5 hinaus die, Bandbreite zu ver grössern, da bei sehr breiten Dipolen Schwierigkeiten in der Zuführung der Speiseströme entstehen, und ferner zwar die Dämpfung erhöht, das heisst der Unterschied des Eingangswiderstandes bei der M- und bei, der 2/4-Resonanz vermindert wird, jedoch die beiden Resonanzstellen zusammenrücken. was die Breitbandwirkung wieder verringert.
Die vorliegende Erfindung bezweckt, diese Schwierigkeit zu beseitigen und hat zum Gegenstand eine Breitbandantenne für sehr kurze Wellen, mit mindestens einem vor einem Metallspiegel angeordneten Strah ler.
D',o erfindungsgemässe Antenne ist da durch gekennzeichnet, da.ss der Strahler ein dem Metallspiegel P paralleles, streifenför- miges Element S aufweist, an dem auf der dem Metallspiegel P abgekehrten Seite min destens ein weiteres streifenförmiges Ele ment Q unter einem von Null verschiedenen Winkel angesetzt ist. Das streifenförmige Element Q kann z.
B. nach Fig. 2a und 2b unter einem rechten Winkel an die Mittel linie des streifenförmigen Elementes S der art angesetzt sein, da.ss ein T-Profil entsteht. Vorzugsweise sind an den beiden Enden des Strahlers S, Q die beiden Elemente S und Q in der Breite verjüngt.
In entsprechender Weise kann nach Fig, 3 durch zwei seitlich an dem streifen förmigen Element S angesetzte streifenför mige Elemente Q1, Q, ein U-Profil oder nach Fig. 4 durch mehrere schräg an die Mittel linie angesetzte Elemente Q" Q2 ein "Fächer- profil" zustande kommen.
Der aus den Elementen S, Q1 und Q2 bestehende Strahler nach Fig. 3 kann aus einem einzigen Blechstreifen durch Umwink- lung an den Rändern hergestellt werden. Alle diese Strahler sind je vor einem Metall spiegel P angeordnet, dem das streifenför- mige Element parallel ist, vorzugsweise im Abstand 1/4.
Es hat sieh gezeigt, da.ss mit diesen Antennen breitere Frequenzbänder wirksam übertragen werden können als mit den bekannten Antennen gemäss Fig. la, 1b.
Broadband antenna for very short waves, with at least one radiator arranged in front of a metal mirror. It is already known for the transmission of broad frequency bands of the ultra-short wave BEZW. Use antennas with a large cross section in the decimeter wave range, e.g. B.
Radiators in the form of very thick tubes. Furthermore, as Fig. La and 1b show in two mutually perpendicular planes, strip-shaped dipoles have been proposed, which are arranged in front of a reflective, preferably flat, metal plate at a distance of approximately R / 4 parallel to this and at its feed point remote end tapered in width, so they are pointed.
It is not possible to increase the bandwidth by increasing the ratio of the width <I> d </I> to the length <I> l </I> beyond about 0.5, since difficulties arise with very wide dipoles the supply of the feed currents arise, and also the damping is increased, i.e. the difference in the input resistance in the M and in the 2/4 resonance is reduced, but the two resonance points move together. which again reduces the broadband effect.
The present invention aims to eliminate this difficulty and has the object of a broadband antenna for very short waves, with at least one radiator arranged in front of a metal mirror.
The antenna according to the invention is characterized in that the radiator has a strip-shaped element S parallel to the metal mirror P and at least one further strip-shaped element Q below zero on the side facing away from the metal mirror P is set at different angles. The strip-shaped element Q can, for.
B. according to Fig. 2a and 2b at a right angle to the center line of the strip-shaped element S of the kind attached da.ss a T-profile. The two elements S and Q are preferably tapered in width at the two ends of the radiator S, Q.
In a corresponding manner, according to FIG. 3, by two laterally attached to the strip-shaped element S, streifenför shaped elements Q1, Q, a U-profile or, according to FIG. 4, by several elements Q "Q2" attached obliquely to the center line, a "fan" profile "come about.
The radiator according to FIG. 3, which consists of the elements S, Q1 and Q2, can be produced from a single sheet-metal strip by bending the edges. All these radiators are each arranged in front of a metal mirror P to which the strip-shaped element is parallel, preferably at a distance of 1/4.
It has shown that broader frequency bands can be effectively transmitted with these antennas than with the known antennas according to FIGS. 1 a, 1 b.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE248656X | 1943-03-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH248656A true CH248656A (en) | 1947-05-15 |
Family
ID=5935609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH248656D CH248656A (en) | 1943-03-22 | 1944-03-10 | Broadband antenna for very short waves, with at least one radiator arranged in front of a metal mirror. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH248656A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3147480A (en) * | 1959-07-09 | 1964-09-01 | Sylvania Electric Prod | Broadband plate antenna |
-
1944
- 1944-03-10 CH CH248656D patent/CH248656A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3147480A (en) * | 1959-07-09 | 1964-09-01 | Sylvania Electric Prod | Broadband plate antenna |
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