CN87204935U

CN87204935U - Coil antenna of variable impendance

Info

Publication number: CN87204935U
Application number: CN 87204935
Authority: CN
Inventors: 张桂芳
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-03-28
Filing date: 1987-03-28
Publication date: 1988-04-13

Abstract

The utility model relates to a loop antenna with variable impedance, belonging to the receiving device of the super-high-frequency wave signal. In order to improve the receiving effect of the loop antenna for the super-high-frequency wave, an additional device through which the impedance of the loop antenna can be changed is added on the loop antenna, comprising a metal wire and a clamping ring with locking screws; the metal wire can be bent into a plane archimedes' spiral, and can also be plane elliptical, triangle-shaped, S-shaped, etc. When the loop antenna with variable impedance is used, the position of the metal wire on the loop antenna is adjusted, the original impedance is changed, and a better matching is achieved. The effect is visible in testing, which is favorable for mass.

Description

Coil antenna of variable impendance

The utility model belongs to the receiving system of hyperfrequency waves segment signal.

Along with the generally raising of people's material, the level of cultural life, television set is popularized rapidly, and is more and more higher to the requirement of television broadcasting in recent years, and the broadcasting of very high frequency(VHF) VHF section is not satisfied, has just advanced the use of UHF shf band.The reception of hyperfrequency waves segment signal should be adopted loop aerial, during reception is to make the intrinsic impedance of hyperfrequency waves and the reception antenna generation resonance that is complementary.The hyper band scope is very wide, with its coupling of loop aerial of a fixed dimension and the situation of resonance the discontented foot of fashion is arranged, and certainly will influence the quality of reception, and the appearance image is unstable, unclear, noise is many, and sound accompaniment is unclear etc.Know does not still have employing at present and on loop aerial, set up attachment device and change the measure that the method for intrinsic impedance improves the quality of reception through investigation retrieval.

The purpose of this utility model is for improving the effect that loop aerial receives ultra-high frequency signal, with simple technological means, setting up attachment device to address the above problem on loop aerial.

By the as above feature of thinking technical solutions of the utility model are the attachment devices that increase the change loop aerial impedance that an adjustable wire in position makes on loop aerial.

By the requirement of this programme, the optimum value φ 170～180 of its loop aerial diameter.Its attachment device that changes impedance combines by the wire that curves definite shape with loop aerial, and the metal collar of tight screw with lock of usefulness formed, and the method with welding connects between the two.Its wire can be bent into the Archimedes spiral on plane, also can make oval in plan, triangle, S shape, linear, sickleshaped, X-shaped, Patterns such as shape.

Adjust loop aerial during use earlier to image and sound accompaniment best results, unclamp the lock screw of attachment device again, load onto this attachment device, be adjusted at the position on the antenna, can find image and the better effect of sound accompaniment, lock screw is fixed it.The program of hyper band is also few owing to present stage, need not often adjust.

The superiority of using this programme to embody: 1. the position of attachment device is adjustable, adjusts the intrinsic impedance that different positions can change primary antenna, can improve reception, in the place of condition of acceptance difference, effect improved must be obvious more.2. simple in structure, cost is low, be easy to make.

Description of drawings:

Fig. 1 is the schematic diagram of variableimpedance formula loop aerial.Wherein: (1)-loop aerial; (2)-change the attachment device of impedance.

Fig. 2 is the attachment device of Archimedes spiral shape.Wherein: (3)-collar; (4)-lock screw.

Fig. 3～Fig. 9 is the various forms of embodiment of attachment device.Fig. 3 is an oval in plan.Fig. 4 is a triangle.Fig. 5 is a S shape.Fig. 6 is a linear.Fig. 7 is a sickleshaped.Fig. 8 is an X-shaped.Fig. 9 is

Shape.

Embodiment: with the plane Archimedes spiral is example, and wire is φ 2.4 copper wires, and its length is 280 millimeters, and it is more to curve 2 circles half, and the radial dimension of outmost turns is about 60 millimeters.This routine sample is remarkable through trial effect.

Claims

1, a kind of loop aerial of variableimpedance formula, it is particularly suitable for the reception of television set to hyperfrequency UHF band signal, it is made up of loop aerial and feeder line mechanism, it is characterized in that the attachment device of the impedance of the change loop aerial that adjustable wire in position of increase is made on loop aerial.

2, according to the loop aerial of the described variableimpedance formula of claim 1, the optimum size that it is characterized in that its loop aerial is φ 170～180.

3, according to the loop aerial of the described variableimpedance formula of claim 1, the attachment device that it is characterized in that its change impedance combines by the wire that curves definite shape with loop aerial, and the metal collar of tight screw with lock of usefulness formed, and both are that the method with welding links.

4, according to the loop aerial of claim 1 or 3 described variableimpedance formulas, it is characterized in that the wire of attachment device of its change impedance can make the Archimedes spiral on plane, also can make oval in plan, triangle, S shape, linear, sickleshaped, X-shaped,

Shape.