KR200346079Y1 - A strip antenna with amplifier for the reception of terrestrial television broadcasting in car or indoor - Google Patents

Abstract

The present invention relates to a narrow and thin flat antenna with a built-in strip antenna shaped like a bamboo for receiving television broadcasts in the VHF and UHF bands, including analog TV broadcasting, digital DMB broadcasting, and digital TV broadcasting. An antenna and a device capable of receiving a broadcast of the same. The present invention can be used simply attached to the glass window by using a rubber magnet, and in the interior such as home or office by simply attached to the wall or glass window to use and beautiful appearance, especially in the VHF-high band It is characterized by excellent performance.

Description

A strip antenna with amplifier for the reception of terrestrial television broadcasting in car or indoor}

The present invention relates to an antenna for vehicle and indoor television broadcasting reception. Conventionally, in the case of a vehicle, the antenna has been erected outside, or the antenna pattern is printed on the rear window of the vehicle together with a heating wire. Recently, however, there is a similar thing to the present invention used by attaching an amplifier and a wire probe to a window of a vehicle interior. There are three major differences between this recent product and the present invention. First, the existing product is a structure in which the probe is not printed on the PCB (Printed Circuit Board) as a wire, so the wire must be manufactured separately and attached to the amplifier. Second, the existing product uses a loading coil to reduce the probe length. Since the length of the probe is not used and the present invention reduces the length of the probe by 40% by using a printing type loading coil, and thirdly, in the present invention, there is no circuit for blocking the influence of inequality coaxial lines, whereas in the present invention, the balun probe is used. It is used between and amplifier to block the phenomenon of interference noise under the influence of coaxial surface current.

In recent years, in Japan, the antenna is manufactured in the form of a sticker and attached to the side glass of the vehicle, but this is fundamentally different from the structure of the antenna.

Among the existing antennas, the V-type antenna or the monopole antenna separately attached to the outside is easy to be broken, easy to lose, difficult to auto wash, and has the disadvantage of damaging the appearance with the inconvenience to put the coaxial line into the room. In addition, the antenna used to print on the glass together with the hot wire is a large noise phenomenon due to the hot wire, there is a disadvantage that is applied only to a specific vehicle.

On the other hand, in the indoor antenna, the amplifier directly supplies power to the main body together with the antenna element, there is a disadvantage that the power must be supplied to the antenna position. However, in the present invention, since the power is supplied to the amplifier attached to the antenna through the bias tee power supply around the television receiver, the antenna can freely move to a position where the radio wave reception condition is good. An amplifier can be attached to extend the coaxial length, allowing it to be moved anywhere in a typical indoor space. In addition, the present invention is very flexible and can be easily attached to a wall, furniture, or glass window because it is in the form of a strip like a bamboo ruler.

Disclosure of Invention An object of the present invention is to implement an antenna for television broadcast reception, which is implemented in a strip structure on a single PCB substrate with a probe and amplifier which is small in size and light in a vehicle or interior, and can be easily attached to a glass window, a furniture, or a wall. .

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1 is a configuration diagram of the present invention antenna system having a strip structure

2 is a side view of the present invention antenna system having a strip structure

3 is a configuration diagram of impedance matching unit consisting of a loading coil and a balun

[Figure 4] is a shape of printing the loading coil directly on the PCB

* Explanation of Signs of Major Parts of Drawings *

1: ground probe 2: signal probe

3: impedance matching unit 4: signal amplifier

5: coaxial line 6: bias tee

7: TV receiver 8: Antenna PCB board

9: additional impedance matching vessel 10: loading coil

11: balun

The present invention for achieving the above object is a grounded probe (1) and signal probe (2) of the dipole structure printed on the PCB,

The loading coil (10), the parasitic surface (9) and the balance of the dipole and the coaxial line unbalance structure to match the impedance difference due to the reduction of the probe to the dipole length of the normal length to 50 Ω impedance A matching part 3 having a balun element 11 for blocking the characteristic change of the antenna due to unnecessary current flowing on the coaxial line surface due to the difference;

An amplifier (4) comprising an amplifier for amplifying a radio signal inputted through a matching unit and a circuit for supplying an appropriate bias to the amplifier;

Coaxial cable (5) for connecting the amplified radio signal to the power supply unit

Characterized in that it comprises a bias tee (6) for supplying power to the amplifier amplification portion through the coaxial line.

In addition, the present invention has a length of normal dipole probe 75cm in half-wavelength based on 200MHz, the center of the VHF-high band (174MHz ~ 216MHz) in order to smoothly receive television broadcast in the VHF and UHF band, but it is too long to It is not suitable to be attached to the windshield, and it is long to see and gives a sense of rejection, so it is reduced by about 40% and the length is about 40cm.

The change in impedance generated by reducing the probe length is connected to the grounding probe 1 by connecting the loading coil 10 to the 50 Ω impedance of the amplifier as much as possible, and matching the impedance to the back of the PCB as shown in FIG. It is characterized in that the impedance matching is performed more precisely by adding the parasitic surface 9. Here, the width of the parasitic surface is wider than the width of the probe strip line on the PCB substrate, but the width and length and the position is determined by measuring the matching state with a network analyzer. In the present invention, the width is as shown in FIG. 2 for convenience. The width and position were 5 cm from the center of the amplifier. However, even if the width and length of the parasitic plane is different from the present invention if the fundamental idea is not out of the scope of this invention. The matched radio signal is connected to a balun 11 having a 1: 1 impedance conversion ratio to block a characteristic change of the antenna caused by the surface current of the coaxial line 5 due to an unbalanced structure. .

The loading coil can be matched with impedance by winding 10 times with a wire of 1.1 mm in diameter inside the air core of about 5 mm in diameter. It is characterized by the implementation of six rotations. Here, although the rotational speed and the shape of the inductor may be slightly different, the basic idea and the present invention do not depart from the scope of the present invention.

As described above, the present invention has a small size and light strip structure, and has an amplifier, so that it can be easily attached to a glass window, a furniture or a wall, and can be easily used even when the antenna is far from the television. Its excellent performance makes it suitable for use as a vehicle or indoor antenna for television broadcast reception. In addition, it is a thin strip structure of less than 2cm in width, so it cannot be aesthetically exposed. If the antenna probe is properly designed on the surface of the PCB, it can give a feeling of interior decoration.

Claims (3)

In-vehicle or indoor TV broadcast receiving strip antenna system, characterized in that the strip form, such as Ginza implemented on the PCB substrate printed at the same time by using a dipole antenna probe, impedance matching unit and signal amplification unit. The method of claim 1, Shortening the antenna probe length, connecting the printed or wired loading coil to the ground probe and matching the impedance by a technique of printing a parasitic surface on the back of the two probes, the vehicle or indoor TV broadcast receiving strip antenna system The method of claim 1, A vehicle or a vehicle characterized in that it is connected to a balun having a 1: 1 impedance conversion ratio by connecting the matching radio signal through the loading coil and the parasitic surface to prevent the characteristic change of the antenna caused by the surface current of the coaxial line due to the unbalanced structure. Indoor telecast reception strip antenna system