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Omnidirectional DTMB antenna

An antenna and axis technology, applied in the field of wireless electromagnetic wave signal receiving devices, can solve problems such as insulation performance decline, signal instability, plastic aging, etc., and achieve the effect of low cost and good receiving effect

Pending Publication Date: 2022-05-13
YANTAI NANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing Yagi antennas still have certain defects: ①Because the Yagi antenna is a directional antenna, when encountering strong wind, the antenna will shift its orientation and need to be readjusted; ②The vibrator and the conductor should be insulated, but due to long-term wind and rain The plastic will age, the insulation performance will decrease, and the reception effect will deteriorate; ③The pole that fixes the wire needs to have sufficient strength, otherwise the antenna will shake in the strong wind, resulting in unstable signal

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1, the present invention will be further described by taking Longkou Transmitting Station as an example below.

[0022] The digital TV terrestrial broadcast frequencies of the Longkou Transmitting Station are shown in the table below:

[0023]

[0024] As can be seen from the above table, there are two local frequency points in Longkou, namely f1=498, f2=514, substituting the formula ②f=(f1+f2+f3...+fn) / n to get the center frequency f=( 498+514) / 2=506MH Z ;

[0025] Substitute f into the formula ①λ=0.96×3×10 5 / f can get the center wavelength λ=0.96×3×10 of the received DTMB signal 5 / 506=569.17mm; where 0.96 is the wavelength correction factor.

[0026] Such as Figure 2-3 An omnidirectional DTMB antenna as shown, includes a copper tube with an outer diameter of 6mm and a wall thickness of 0.5mm bent into a shape such as image 3 The shown C-shaped conductor 100, for convenience of explanation, divides the C-shaped conductor 100 into a body section ...

Embodiment 2

[0033] Embodiment 2, in order to better fix the C-shaped conductor 100, the coaxial cable connection base 200 and the wire 300, the inventor used an iron plate to make a rounded rectangular groove slightly larger than the C-shaped conductor 100. mold, a round hole with an inner diameter slightly larger than the outer diameter of the screw head of the coaxial cable connecting female seat 200 is opened on the side wall of the groove mold, and then the C-shaped conductor 100 is overhead placed in the groove mold, and the coaxial cable The screw head connecting the female seat 200 is exposed outside the side wall of the groove-shaped mould, through the round hole, and then the random copolymerized polypropylene particles are melted and poured into the groove-shaped mold, and the C-shaped conductor 100 and the coaxial cable are connected to the female seat 200 is completely buried, and the random copolymerized polypropylene is cooled to room temperature and taken out from the groove...

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Abstract

The invention relates to a wireless signal receiving device, in particular to an omnidirectional DTMB antenna which comprises a C-shaped conductor formed by bending a copper pipe or an aluminum pipe, the C-shaped conductor comprises a body section, a long arm section, a short arm section, a long body section connecting the body section and the long arm section and a short body section connecting the body section and the short arm section, and the axis of the long arm section and the axis of the short arm section coincide. The axis of the long arm section or the short arm section is parallel to the axis of the body section, the axis of the body section is orthogonal to the axes of the long body section and the short body section, the body section and the short body section are respectively provided with a body feed point and a short arm feed point, the body feed point is connected with an inner terminal of the coaxial cable connecting female seat through a wire, and the short arm feed point is connected with an outer terminal of the coaxial cable connecting female seat through a wire. Omnidirectional receiving of DTMB signals can be achieved through the C-shaped conductor formed by bending a copper pipe or an aluminum pipe. Practice tests show that directional installation is not needed, the antenna can be placed at will outdoors without obvious shielding, and the antenna is free of wind and rain, low in manufacturing cost, long in service life and good in receiving effect.

Description

technical field [0001] The invention relates to a wireless electromagnetic wave signal receiving device, in particular to an omnidirectional DTMB antenna. Background technique [0002] At present, the Yagi antenna can be used to receive DTMB signals. Typical Yagi antennas are as follows: figure 1 As shown, it includes the main pole 2 fixed on the vertical pole 1, the vibrator is fixed on the main pole 2, and the main pole 2 and the vibrator are in the shape of a "king" as a whole. The one connected to the coaxial cable feeder 6 in the center is called the active vibrator or the main vibrator 3, and the one side of the active vibrator is called the reflector 4, which is longer than the active vibrator, which plays a role in weakening the radio waves coming from this direction or from the antenna. The function of the emitted electric wave; the director 5, which is located on the other side of the active vibrator 3 and slightly shorter than the active vibrator, can enhance the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/36H01Q19/30H01Q1/00H01Q1/22
CPCH01Q1/36H01Q19/30H01Q1/005H01Q1/002H01Q1/22
Inventor 朱广冕荆蕾高树贤
Owner YANTAI NANSHAN UNIV
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