Antenna element

FIELD: microwave engineering; transceiving antennas for local industrial networks.

SUBSTANCE: proposed antenna element has dielectric resonator in the form of dielectric disk, coaxial line section with central conductor connected to cylindrical conductor, and space-enclosing conductive wall. Dielectric disk extends length l beyond space. Conductor section whose longitudinal axis is aligned with dielectric disk axis excites electromagnetic waves in the latter, their field structure corresponding to that of dielectric resonator E-waves. Dielectric disk axis is perpendicular to conductive wall surface. Effective excitation of E-waves in dielectric disk is ensured when its thickness is chosen from equation , where h is dielectric disk thickness; D is its diameter. Dielectric disk extends l = h - δ beyond space, where h is dielectric disk thickness; δ is conductive wall thickness amounting to 0.1-0.3 of dielectric disk thickness l.

EFFECT: enlarged passband and enhanced gain.

3 cl, 4 dwg

 

The invention relates to techniques for microwave and is intended to create antenna transceivers local area networks industrial purposes.

Known antenna radiators on the basis of open dielectric resonators (Dielectric resonators in microelectronics microwave/ Umessage, Lchashen, Lab and other Reviews on electronics, Vol. 1 "electronics microwave"4 (786), Central research Institute of electronics restoration of the USSR, 1981, 82 S., p.63-64)formed of a flat dielectric resonator, for example a disk, electromagnetic associated with the transmission line, in which the dielectric resonator is mounted on the dielectric substrate in a primary conductor line, or with a metal waveguide, in which the dielectric resonator is installed in the hole in the conductive wall. In both cases, the antenna radiators on the open dielectric resonators used a lower form of resonator, which structurally is expressed in a specific orientation axis of the disc relative to the longitudinal axis of the transmission line, namely, the orthogonal orientation of the disk axis and the longitudinal axis of the transmission line.

The lack of antenna radiators is the inability to implement an effective antenna with the required bandwidth and the transmission coefficient due to the inability to maintain strong ties dielectric rez is the General with the lowest form of oscillations simultaneously with the transmission line and free space (radiation).

The closest in technical essence of the present invention is the antenna element (Dielectric resonators in microelectronics microwave/ Umessage, Lchashen, Lab and other Reviews on electronics. Ser. 1 "electronics microwave"4 (786), Central research Institute of electronics restoration of the USSR, 1981, p.63, Fig. 54,b), containing a segment of the metallic waveguide, limited at one end of the flat metal wall, perpendicular to its longitudinal axis, which made the hole, which has a dielectric resonator made in the form of a flat disc, the axis of which coincides with the plane of the metal walls.

This antenna element is implemented at the lowest form of fluctuations of the dielectric resonator, which does not allow effective antenna with the required bandwidth and gain.

An object of the invention is the expansion of bandwidth and increase the transfer rate.

The solution to this problem is achieved by the fact that the known antenna element containing a segment of transmission line placed in a cavity bounded by a conducting wall with a hole and electromagnetic associated with the dielectric resonator, made in the form of a dielectric disk, located in the hole of the conductive wall with cut cylindrical wire is the AC dielectric disk antenna element is located so that its axis perpendicular to the surface of a conducting wall, the diameter of the hole matches the diameter of the dielectric disk, the length of the transmission line formed by the coaxial line center conductor of which is connected with a segment of a cylindrical conductor, placed coaxially with the dielectric disk.

In addition, the thickness of the dielectric disk can be chosen from the conditionwhere h is the thickness of the dielectric disk, D is the diameter of the dielectric disk.

In addition, the dielectric disk can be performed protruding from the cavity on the value of l chosen from the condition l=h-δwhere h is the thickness of the dielectric disk, δ - the thickness of a conducting wall, which is chosen equal to 0,1...0,3 to the thickness of the dielectric disk.

The invention is illustrated by drawings, where figure 1 presents the antenna element, figure 2 shows the antenna element arrow a in figure 3 shows the frequency response of the antenna element, and figure 4 shows the spatial pattern of the antenna element in the azimuthal plane.

The antenna element includes a dielectric resonator made in the form of a dielectric disk 1, thickness h and diameter D, the length of the coaxial line 2 with the Central provodnikov is 3, which is connected to a segment of a cylindrical conductor 4, the cavity 5, a conductive wall 6 of a thickness of δ with a hole 7, bounding the cavity 5.

Dielectric disk 1 can be performed protruding from the cavity 5 by the value of l.

The antenna element operates as follows.

Electromagnetic wave propagating along the segment of coaxial line 2, through the Central conductor 3 excites oscillations with circular lines of force of the high-frequency magnetic field in the United with him cylindrical segment of the conductor 4. A segment of a cylindrical conductor 4, the longitudinal axis of which coincides with the axis of the dielectric disk 1, excites in the last electromagnetic waves with a field structure corresponding to the structure of the field in a segment of a cylindrical conductor 4. The structure of this electromagnetic field corresponds to the oscillations of the E-type dielectric resonator (i.e. the second type of oscillations of open dielectric resonators). If the dielectric disk 1 has a resonant dimensions, corresponding to the oscillations of the E-type on the frequency of the electromagnetic waves, the observed resonant growth of energy stored in it. It is established that at the location of the axis of the dielectric disk 1 perpendicular to the surface of a conducting wall 6, the oscillations of the E-type in it, excited by the cut cylindricus the th conductor 4, have an equally strong electromagnetic communication with the cavities 5 and with the free space (radiation). The size of the hole 7 in the conductive wall 6, bounding the cavity 5, no significant effect on the electrical characteristics of the antenna element and therefore the size of the holes can be reduced to the limit determined by the diameter of the dielectric disk 1. This reduces the risk of spurious out-of-band radiation of this antenna element.

It was established experimentally that the effective excitation of oscillations of the E-type in the dielectric disk 1 is observed when the thickness of the dielectric disk 1, selected from the conditionwhere h is the thickness of the dielectric disk 1, D - diameter of the dielectric disk 1.

In addition, it is found experimentally that the best electrical parameters has an antenna element in which a dielectric disk 1 protrudes from the cavity 5 by the value l=h-δwhere h is the thickness of the dielectric disk 1, δ - the thickness of the conductive wall 6, which is chosen equal to 0,1...0,3 to the thickness of the dielectric disk 1. When this balance is achieved the highest correlation with the free space, and the relationship with the length of coaxial transmission line 2 is regulated by the distance between the cut cylindrical conductor 4 and the end p is the surface of the dielectric disk 1.

The use of the invention has made it possible to create frequency range (2 to 3) GHz antenna element on the dielectric resonator with the resonant bandwidth ˜15 MHz level VSWR=2 and the spatial pattern corresponding to the electric dipole with a high gear ratio. It turned out to be acceptable for implementation of transceivers local area networks industrial purposes.

1. The antenna element containing a segment of transmission line placed in a cavity bounded by a conducting wall with a hole and electromagnetic associated with the dielectric resonator, made in the form of a dielectric disk, located in the hole of the conductive wall, characterized in that it has cut a cylindrical conductor, the dielectric disk is positioned so that its axis perpendicular to the surface of a conducting wall, the diameter of the hole matches the diameter of the dielectric disk, the length of the transmission line formed by the coaxial line center conductor of which is connected to inputs of a segment of a cylindrical conductor, placed coaxially with the dielectric disk.

2. The antenna element according to claim 1, characterized in that the thickness of the dielectric disk is selected from the condition

,

where h is the thickness of the dielectric is historical disk;

D - diameter of the dielectric disk.

3. The antenna element according to claim 2, characterized in that the dielectric disk protrudes from the cavity to a value of l=h-δwhere h is the thickness of the dielectric disk, δ - the thickness of a conducting wall, which is chosen equal to 0,1...0,3 to the thickness of the dielectric disk.



 

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