RU2484561C1 - Resonator-fed half-wave antenna - Google Patents

Abstract

FIELD: radio engineering, communication.

SUBSTANCE: antenna has a dielectric base 1 in form of a right circular cylinder, a wire 2 wound on that base as well as a hollow resonator cylinder 3 made from conducting material. The length N of the wire 2 is N=3/4·λ, where λ is the wavelength. The wire is wound on the base 1 and forms a cylindrical spiral. The length L of the arbitrary cylindrical surface of the cylindrical spiral is shorter than the length N of the wire 2. Half of the lower part of the spiral lies inside the resonator cylinder 3 coaxially with it. The length of the generatrix of the cylinder 3 is also L₂, where L₂=1/3L. The lower end of the spiral 2 lies in the region of the lower face of the cylinder 3 and is connected to the centre conductor of the coaxial cable whose braided shield is connected to the cylinder 3.

EFFECT: reduced vertical dimension of the antenna.

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Description

FIELD OF THE INVENTION

The invention relates to “short” (in the electrical sense) antennas with dimensions not exceeding twice the working wavelength and composed of electrically conductive active radiating elements, namely, resonant antennas with spiral radiating elements.

State of the art

Known J-antenna (half-wave antenna with resonant power), containing the radiating part, made in the form of a half-wave pin, and a quarter-wave resonator, made in the form of a short pin and designed for coordination with the feeder (see, for example, Rothammel K. Antennas. TI Moscow : Danvel, 2005. - P.374; antenna ASH-433 of the type “half-wave pin, commercially available from Altonika LLC; Grigorov IN Half-wave antennas with resonant power / http://www.qrz.ru/schemes/contribute /antenns/rk3zk-ant.shtml).

Signs that are common to the known and claimed solutions are the presence of a radiating part.

The reason that prevents obtaining the required technical result in a known technical solution is that the radiating part is in the form of a pin, which significantly increases the overall vertical dimension of the antenna.

The closest analogue (prototype) is a J-shaped antenna with a "blocking surround circuit". It contains a radiating part, made in the form of a half-wave pin, and a quarter-wave resonator, made in the form of a resonator cylinder with a bottom, i.e. glass ("blocking volumetric contour"), so that the specified pin is partially located in the cylinder coaxially with it (Rothammel K. Antennas. T.2. Moscow: Danvel, 2005, Fig. 25.2 on p. 104).

Signs that are common to the known and claimed solutions are the presence of a radiating part and a resonator cylinder.

The reason that prevents obtaining the required technical result in a known technical solution is that the radiating part is in the form of a pin, which significantly increases the overall vertical dimension of the antenna.

SUMMARY OF THE INVENTION

The problem to which the invention is directed, is to reduce the vertical dimension of the antenna.

The technical result that mediates the solution of this problem is to reduce the length of the radiating part of the antenna by twisting its radiating part into a spiral.

The technical result is achieved in that a half-wave antenna with resonant power for receiving and emitting radio signals with a wavelength of λ contains a wire of length N = 3/4 · λ, twisted into a cylindrical spiral, the length of the generatrix of the conditional cylindrical surface of which is L, so that L <N and a hollow resonator cylinder for connecting a coaxial cable to the braid, wherein a part of said spiral is located inside the resonator cylinder coaxially with it so that the end of the spiral intended for connecting the spiral guide to the central core of the coaxial cable, located in the region of the corresponding end of the resonator cylinder, the length of the generatrix of which is 1/3 · L.

New features of the claimed technical solution are the presence of a wire of length N = 3/4 · λ, twisted into a cylindrical spiral, the length of the generatrix of the conditional cylindrical surface of which is L, so that L <N, as well as the implementation of the resonator cylinder with a generatrix length of 1 / 3 · L.

List of drawings

The attached figure schematically shows the claimed antenna. Information confirming the possibility of carrying out the invention

A half-wave antenna with resonant power for receiving and emitting radio signals with a wavelength of λ contains: a dielectric base 1 in the form of a straight circular cylinder, a wire 2 wound around this base, and also a hollow resonator cylinder 3 made of conductive material. The length N of wire 2 is N = 3/4 · λ. The wire, being wound on the base 1, forms a cylindrical spiral, the conditional cylindrical surface of which is defined by the base 1. The length L of the conditional cylindrical surface of the cylindrical spiral is less than the length N of wire 2 (L <N), due to which the overall antenna dimension is significantly reduced. In this case, the spiral consists of two parts - the upper L ₁ and lower L ₂ (L = L ₁ + L ₂ ). Part of this spiral, namely its lower part L ₂ , is located inside the resonator cylinder 3 coaxially with it. The length of the generatrix of the cylinder 3 is also L ₂ , with L ₂ = 1 / 3L. In addition, the lower end of the wire (spiral) 2 is located in the region of the lower end of the cylinder 3 and is connected to the central core of the coaxial cable, the shielding of which is connected to the cylinder 3 (cable not shown).

The operation of the antenna is as follows.

The radiating part of the antenna (half-wave vibrator) is the part L _{1 of the} spiral, which is located outside the cylinder 3. The length of the wire on this part of the spiral is 1/2 · λ, while this part of the spiral itself has a length much smaller due to the twisted wire in spiral. The function of the quarter-wave resonator is performed by the resonator cylinder 3 together with that part L _{2 of the} helix, which is located inside the specified cylinder 3. Thus, this antenna works in the same way as the classical J-antenna (half-wave antenna with resonant power).

Thus, on the basis of the claimed invention, it is possible to produce antennas reduced to several times the size depending on the compression ratio, which makes it convenient to install the antenna when this installation needs to be hidden. It is obvious that with a decrease in the size of the antenna decreases its gain.

Additional advantages of the claimed antenna (except for reduced size) are:

1) the antenna becomes more broadband and does not require tuning to the frequency within the range;

2) due to the fact that in addition to linear polarization, a circular one also appears, the vertical arrangement of the antenna is not necessary; the antenna maintains its operability (with slight deterioration) with an inclined and even horizontal arrangement;

3) the material consumption for the manufacture of the cylinder is reduced so many times, how many times the length of the spiral is less than the length of the wire.

Claims (1)

A half-wave antenna with resonant power for receiving and emitting radio signals with a wavelength of λ, containing the radiating part and a quarter-wave resonator made in the form of a resonator cylinder designed to connect to the braid of a coaxial cable, characterized in that it contains a wire of length N = 3/4 · λ twisted into a cylindrical spiral, the length of the generatrix of the conditional cylindrical surface of which is L, so that L <N, while part of this spiral is located inside the resonator cylinder coaxially with it, that the end of the spiral, designed to connect the spiral wire to the central core of the coaxial cable, is located in the region of the lower end of the resonator cylinder, the generatrix of which is 1/3 · L, and the radiating part of the antenna is the part of the spiral that is located outside the resonator cylinder.