CN101325283B - digital tv antenna - Google Patents

Abstract

The invention relates to a digital television antenna, which comprises a first radiation conductor, a second radiation conductor and a transmission line, wherein the first radiation conductor and the second radiation conductor are arranged on a substrate in parallel at a preset distance. Each radiation conductor comprises a feed-in point, a metal sheet and a bending metal wire which is connected in series by a plurality of bending metal wire sections, one end of the bending metal wire is coupled with the feed-in point, the other end of the bending metal wire is coupled with the metal sheet, wherein each bending metal wire section of the first radiation conductor is an inverted L-shaped wire section, and each bending metal wire section of the second radiation conductor is an L-shaped wire section. The transmission line is provided with a grounding wire and a signal wire which are respectively connected with the first feed-in point and the second feed-in point.

Description

digital tv antenna

technical field

The present invention relates to an antenna device, and in particular to an antenna device built in a wireless communication device for receiving digital television signals.

Background technique

With the advancement of science and technology, the main battlefield of communication technology has gradually shifted from wired communication technology to wireless communication technology. Especially when applied to digital TV signal transmission, wireless digital TV can be used for outdoor and mobile reception, and does not have to be limited to indoor viewing. The antenna device has become one of the most critical components of wireless digital TV

For mobile devices used to receive digital TV signals in the past, antenna devices are mostly attached to the outside of the mobile device to receive wireless signals, such as helix antennas. However, the exposed antennas are easily damaged by external forces and are not conducive to carrying. Therefore, the current design trend is to use an external antenna device, which is then coupled to the USB port of the mobile device to transmit the wireless digital TV signal to the mobile device. However, since the operating frequency band of digital TV is between 470MHz and 870MHz, if the physical size of the general antenna is designed, the external antenna will be too large to be portable.

Therefore, there is a real need for a miniature receiving antenna that can be integrated into an external wireless digital TV receiving box to improve the convenience of wireless mobility.

Contents of the invention

Therefore, the technical problem to be solved by the present invention is to provide a miniature wireless digital TV antenna, which can be integrated in an external wireless digital TV frequency receiving box.

To achieve the above objectives, the digital TV antenna of the present invention is located in a mobile device and includes: a first radiating conductor, a second radiating conductor and a transmission line. Wherein the first radiating conductor includes a first feeding point, a first metal sheet and a first bent metal wire, the first bent metal wire has a plurality of reverse "L" shaped line segments connected in series, One end of the first bent metal wire is coupled to the first feeding point, and the other end is coupled to the first metal sheet. The distance between the second radiating conductor and the first radiating conductor is a predetermined distance, and the second radiating conductor includes: a second feeding point, a second metal sheet and a second bent metal wire, the second bent metal The line has a plurality of "L"-shaped line segments connected in series, wherein one end of the second bent metal line is coupled to the second feeding point, and the other end is coupled to the second metal sheet. The transmission line has a ground line and a signal line respectively connected to the first feeding point and the second feeding point, so that a differential input signal can be formed.

The digital TV antenna of the present invention can be integrated in an external wireless digital TV receiving box, which can improve the convenience of wireless movement.

Description of drawings

In order to make the above and other objects, features, advantages and embodiments of the present invention more comprehensible, the detailed description of the accompanying drawings is as follows:

Fig. 1 shows a schematic diagram of a digital television antenna according to a preferred embodiment of the present invention;

FIG. 2 is an enlarged schematic diagram of the first radiating conductor;

FIG. 3 is an enlarged schematic view of the second radiating conductor;

Fig. 4 shows the return loss measurement results of the antenna of the present invention.

[Description of main component symbols]

100 digital TV antenna

101 transmission line

102 first radiating conductor

104 second radiating conductor

106 first metal sheet

107 second metal sheet

108 first bent metal wire

109 second bent metal wire

110, 112 feed points

1081, 1082, 1083, 1084, 1085, 1086, and 1087 reverse "L"-shaped line segments

1091, 1092, 1093, 1094, 1095, 1096 and 1097 "L" shaped segments

Detailed ways

FIG. 1 is a schematic diagram of a digital TV antenna 100 according to a preferred embodiment of the present invention. Wherein the digital TV antenna 100 is embedded in a mobile device, such as an external wireless digital TV receiving box, for receiving digital TV frequency bands from 470MHz to 870MHz, and the external wireless digital TV receiving box is preferably a digital TV stick (DTV USB DONGLE).

The digital TV antenna 100 of the present invention includes two parallel and symmetrical first and second radiation conductors 102 , 104 and a transmission line 101 . The two radiating conductors 102 and 104 have a predetermined distance d between them and are arranged in parallel on a substrate (not shown in the figure). In one embodiment, the preset distance d is 2mm (millimeters), but the preset distance d is not limited to this embodiment in practice, and the substrate used to form the digital TV antenna 100, for example, is formed on an external The inner side of the upper cover of the wireless digital TV receiving box, and the forming method, such as printing or etching technology, is formed on the inner side of the upper cover of the receiving box. The transmission line 101 can be a coaxial transmission line or a microstrip transmission line.

As shown in FIG. 2, the first radiation conductor 102 includes a first metal sheet 106 and a first bent metal wire 108, wherein one end of the first bent metal wire 108 is a feeding point 110, and the other end is connected to to the first metal sheet 106 . Wherein the first meander-shaped metal line 108 includes a plurality of reversed "L" shaped line segments 1081, 1082, 1083, 1084, 1085, 1086 and 1087 connected in series, but in practical applications, the number of reversed "L" shaped line segments It is not limited by this embodiment. Wherein the adjacent anti-"L"-shaped line segments overlap each other and have a preset distance a apart. In one embodiment, the preset distance a is 0.6mm (millimeter), but the preset distance a does not limited by this example. In addition, each inverted "L"-shaped line segment has a first end and a second end, and the concatenation of three adjacent inverted "L"-shaped line segments, taking the inverted "L"-shaped line segments 1081, 1082 and 1083 as an example , the second ends of the inverted "L"-shaped segments 1081 and 1082 are coupled together, and the first ends of the inverted "L"-shaped segments 1082 and 1083 are coupled together to form a concatenated inverted "L"-shaped segment 1081 , 1082 and 1083. With the extension of the trace, the length of the reverse "L"-shaped line segment will gradually decrease, and the innermost reverse "L"-shaped line segment 1087 will be connected to the first metal sheet 106 and surround the adjacent ones of the first metal sheet 106. sides.

As shown in Figure 3, the second radiation conductor 104 includes a second metal sheet 107 and a second bent metal wire 109, wherein one end of the second bent metal wire 109 is a feeding point 112, and the other end is connected to to the second metal sheet 107. Wherein the second meander-shaped metal line 109 includes a plurality of "L"-shaped line segments 1091, 1092, 1093, 1094, 1095, 1096 and 1097 connected in series, but in practical applications, the number of "L"-shaped line segments does not limited by this example. Wherein the adjacent "L"-shaped line segments overlap each other and are separated by a preset distance a. In one embodiment, the preset distance a is 0.6 mm (millimeters), but in practical applications the preset distance a is not This example is limited. In addition, each "L"-shaped line segment has a first end and a second end, and the concatenation of three adjacent "L"-shaped line segments, taking "L"-shaped line segments 1091, 1092 and 1093 as an example, "L" The second ends of the ""-shaped segments 1091 and 1092 are coupled together, while the first ends of the "L"-shaped segments 1092 and 1093 are coupled together to form a series of "L"-shaped segments 1091, 1092 and 1093. With the extension of the trace, the length of the "L"-shaped line segment will gradually decrease, and the innermost "L"-shaped line segment 1097 will be connected to the second metal sheet 107 and arranged around the adjacent two sides of the second metal sheet 107 side.

Please refer to Fig. 1 to Fig. 3 at the same time, wherein the feed-in point 110 and the feed-in point 112 are connected to the coaxial transmission line 101, the feed-in point 110 is connected to the signal conductor of the coaxial transmission line 101, and the feed-in point 112 is connected to the coaxial transmission line 101 ground wire connection. The transmission line 101 can also be a coplanar transmission line, or a microstrip transmission line through balanced to unbalanced transfer to form a differential input end.

In one embodiment, the appearance of the first metal sheet 106 and the second metal sheet 107 is a rectangle, wherein the width of the rectangle is 2.6 mm, and the length of the rectangle is 45 mm. The line width of the first meander-shaped metal line 108 and the second meander-shaped metal line 109 is 0.3 mm. The distance between the first meander-shaped metal wire 108 and the second meander-shaped metal wire 109 is 0.6 mm. Both the feed-in point 110 and the feed-in point 112 are rectangular in shape, wherein the width of the rectangle is 1 mm, and the length of the rectangle is 1 mm. However, in practical applications, the appearance of the first metal sheet 106 and the second metal sheet 107, the appearance of the feed-in point 110 and the feed-in point 112, the line of the first bent metal line 108 and the second bent metal line 109 The width and line spacing are not limited by this embodiment. In other embodiments, since the effective length of the antenna is related to the operating frequency and wavelength, an antenna that meets the bandwidth requirements can be designed by changing the antenna path length. The geometric shapes of the first metal sheet 106 and the second metal sheet 107 affect the coupling amount and indirectly affect the effective length of the antenna.

The return loss of the antenna is measured through experiments as shown in FIG. 4 . In this experiment, the following dimensions are selected for measurement: the distance between the first and second radiating conductors is 2mm. The first metal sheet 106 and the second metal sheet 107 are 2.6mm×45mm rectangular. The line width of the first meander-shaped metal wire 108 and the second meander-shaped metal line 109 is 0.3 mm, and the line distance is 0.6 mm. It can be known from the return loss diagram that the return loss values of the antenna are all higher than the 5dB value, and the experimental measurement values of the return loss show that the overall design of the antenna has good measurement data.

It is worth noting that the above-mentioned antennas are all described with a dipole antenna as an example, but the structure of the first radiating conductor 102 or the second radiating conductor 104 of the present invention can also be applied independently, by changing the antenna line width, line distance and the second A metal sheet and a second metal sheet geometry to affect coupling are used in a monopole antenna.

Although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field of the present invention can make various embodiments without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims (10)

1. A digital TV antenna, characterized in that it is located in a mobile device, comprising: A first radiation conductor located on a substrate, wherein the first radiation conductor comprises: a first feed point; a first metal sheet; and A first bent-shaped metal wire, having a plurality of reversed L-shaped wire segments connected in series, wherein adjacent reversed L-shaped wire segments overlap each other and are separated by a first preset distance, wherein the first bent-shaped metal wire One end of the wire is coupled to the first feeding point, and the other end is coupled to the first metal sheet; A second radiating conductor located on the substrate, wherein the second radiating conductor is separated from the first radiating conductor by a second predetermined distance, wherein the second radiating conductor includes: a second feed point; a second metal sheet; and A second meander-shaped metal wire has a plurality of L-shaped line segments connected in series, wherein adjacent L-shaped line segments overlap each other and are separated by a third preset distance, wherein one end of the second bent-shaped metal wire coupled to the second feeding point, and the other end coupled to the second metal sheet; and A transmission line has a ground line and a signal line respectively connected to the first feeding point and the second feeding point. 2. The digital TV antenna according to claim 1, wherein the mobile device is a digital TV stick. 3. The digital TV antenna according to claim 1, wherein the first and second radiating conductors are used for receiving digital TV frequency bands of 470MHz to 870MHz. 4. The digital television antenna according to claim 1, wherein the second preset distance is 2mm. 5 . The digital TV antenna according to claim 1 , wherein the line width of the first meander-shaped metal wire is 0.3 mm, and the line width of the second meander-shaped metal line is 0.3 mm. 6. The digital television antenna according to claim 1, wherein the first preset distance is 0.6mm, and the third preset distance is 0.6mm. 7. The digital TV antenna according to claim 1, wherein the first metal sheet and the second metal sheet are a rectangular metal sheet. 8 . The digital TV antenna according to claim 7 , wherein the rectangular metal sheet has a width of 2.6 mm and a length of 45 mm. 9 . The digital TV antenna according to claim 1 , wherein the first bent metal wire has seven inverted L-shaped segments, and the second bent metal wire has seven L-shaped segments. 10. A digital TV antenna, characterized in that it is located in a mobile device, comprising: a feed point; a metal sheet; and A bent metal wire has a plurality of bent metal wire segments connected in series, wherein adjacent bent metal wire segments are stacked on top of each other and separated by a preset distance, wherein each of the bent metal wires has a A first line segment extending in one direction and a second line segment extending in a second direction, one end of the bent metal line is coupled to the feeding point, and the other end is coupled to the metal sheet.

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