KR0146682B1 - Antenna for pager receiver - Google Patents

Abstract

The present invention relates to an antenna for a radio call receiver, and more particularly, to an antenna for a radio call receiver which minimizes the influence from the human body and hardly changes the reception sensitivity even in a sealed container when carrying.

To this end, in the antenna for a radio call receiver, a coupling hole 4 is formed so that a copper plate having the same size as that of the frame 1 in which the circuit board is embedded is installed on the upper portion, and a plurality of coupling holes 5 (outside the copper plate) A second rectangular plate 6 having a 5 ') formed thereon, and a second portion 7 formed at a lower portion of the frame 1 and having protrusions 7 and 7' formed at one predetermined portion, and the other predetermined portion being sectioned. Screws penetrating through the rectangular plate 8, the coupling holes 5, 5 ′ and the protrusions 7 and 7 ′ formed in the first and second rectangular plate 6, 8, and the frame 1. It is made by combining (9) (9 ').

Description

Wireless Call Receiver Antenna

The present invention relates to an antenna for a wireless call receiver, and more particularly, to an antenna for a wireless call receiver which minimizes the influence from the human body and hardly changes the reception sensitivity even in a sealed container when carrying.

Conventional radio call receiver antennas use a variety of antennas, such as wire loop antennas, plate antennas, inverted-F antennas, and ferrite core antennas.

Small loop antennas of this kind not only have very low efficiency because their radiation resistance (Rr) is small, but also have very high directivity, so that there is a significant difference in reception rate in a specific reception direction.

That is, since the gain of the loop antenna depends on the area of the loop antenna, it is natural that the loop antenna embedded in the case is limited in the case size, so that the cross-sectional area can not be increased any more, so the gain of the loop antenna is reduced.

In addition, the wireless pager has become a small and thin trend, but the built-in loop antenna is difficult to expect further gains, and the size of the antenna itself can no longer be reduced, so the reception gain of the antenna has reached a limit.

More specifically, the built-in antenna of a typical pager is mainly composed of two types. First, a loop antenna is formed by using a wire or plate, and second, a coil is wound around a ferrite core. .

Since loop antennas have a small loop cross-sectional area, a loop antenna has a low reception gain, and thus tends to weaken the strength of reception radio waves more than other antennas.

That is, when the transmitter transmits a signal, the signal received through the loop antenna built into the pager should be applied to the amplifying stage of the pager receiver to be amplified. If the gain of the antenna itself is not sufficient, the transmitter of the pager transmits the signal. In a region where the signal is weak, the radio call receiver cannot detect the signal, and since the directivity is strong, the amplification stage of the radio call receiver may not detect the signal when used in a specific direction.

Antennas using a ferrite core have a higher reception gain and better directivity than loop antennas, but are very sensitive to the surrounding environment, i.e., the effect of the human body, and thus the body effect is reduced.

In order to cope with the small size, light weight, and thin call of the wireless call receiver, the conventional built-in antenna as described above has to reduce the size or width of the antenna. The reliability is deteriorated.

In order to solve the above problems, the present invention is to install the upper plate and the lower plate of the lower plate made of copper with an insulator and a frame on which the circuit board is installed, and then the two rectangular plates and the frame as screws By forming a loop-shaped antenna, the loop area is large enough to increase the gain, and the operating impedance is low, so the influence of the surroundings, especially from the human body, is reduced, so that the reception sensitivity can be used even when the wireless call receiver is put in the pocket or bag. It is an object of the present invention to provide an antenna for a wireless call receiver that can prevent the degradation.

1 is an exploded perspective view of an antenna for a radio call receiver according to the present invention.

2 is an equivalent circuit diagram of an antenna for a radio call receiver according to the present invention.

* Explanation of symbols for main parts of the drawings

1 frame 2 power unit

3: groove 4,5,5 ': coupling hole

6: first square plate 7: protrusion

8: second square plate 9: screw

According to the present invention, in the antenna for a wireless call receiver, a coupling hole 4 is formed and a copper plate having the same size as that of the frame 1 embedded in the circuit board is installed on the upper portion, and the copper plate has a plurality of coupling holes 5 on the outside. A first rectangular plate 6 having a 5 'formed thereon, and a protrusion 7 and a 7' formed at a predetermined portion on one side of the frame 1 and a predetermined portion on the other side. 2 through the rectangular plate 8, the coupling holes (5) 5 'and the protrusions (7) (7') formed in the first and first rectangular plate (6) (8) and the frame (1) It is comprised by combining as screw 9 (9 ').

Hereinafter, described in detail by the accompanying drawings as follows.

1 is an exploded perspective view of an antenna for a wireless call receiver according to the present invention, in which a plurality of circuit elements are installed, a groove 3 into which a battery 2 can be inserted is formed on one side, and a plurality of coupling holes to the outside. (4) is formed and the first rectangular plate 6 is formed in the upper portion of the frame (1) in which the substrate is seated and made of copper plates and formed with a plurality of coupling holes (5) outward.

In addition, the lower portion of the frame (1) is made of the same material as the first rectangular plate (6), the portion in which the battery (2) is located is cut, the protruding portion (7) that can be coupled to the screw at both ends of one side A second rectangular plate 8 provided with 7 'is disposed, and is formed in the protrusions 7 and 7' and the first rectangular plate 6 and the frame 1 provided in the second rectangular plate 8. The coupling holes 5 and 4 are fixed as screws 9 and 9 'so that the first and second square plates 6 and 8 form a looped antenna.

According to the present invention made as described above, the first rectangular plate 8 is pushed into the lower part of the frame 1 so as to be raised at the bottom of the frame 1, and then the electronic component is placed in the inner space of the frame 1. After the inserted substrate is inserted, the first rectangular plate 6 antenna 6 is placed on the frame 1, and the screws 9 and 9 'are tightened and fixed.

At this time, the screw (9) (9 ') is inserted into the plurality of coupling holes (5) (5') 4 and the projection 7 of the lower second rectangular plate to be electrically connected to the first upper and lower plates And the first rectangular plate (6) (8) is in the form of a loop, and finally, the power supply unit (2) is pushed into the groove (3) of the frame (1) so as to supply power to the pager. Is completed.

In general, the absolute gain (Ga) of the micro loop antenna is expressed as follows.

N is the radiation effect of the antenna, which is represented by the following equation by the radiation resistance (Rr) and the loss resistance (Rℓ).

Where reflection resistance Loss Resistance It is displayed as It becomes

Where S is the area of the loop (L * h), L is the loop circumference 2 (L + h), π d is the surface area 2 (w + t), μ permeability, σ is the conductivity, and t is the thickness of the antenna.

In the above equations, it is impossible to increase the loop area S because only h of a general thin pager is small, but the antenna of the present invention secures a large surface area of the upper and lower plates, that is, the first first rectangular plate 6, 8. As the width w is large, the loss resistance Rl is small, and the radiation efficiency is increased by Equation (2), and the absolute gain Ga is increased by Equation (1).

Therefore, in the present invention, since the absolute gain of the antenna for the thin type wireless call receiver is large enough for the loop area S, it can be seen that the gain is almost the same or increased even when compared with the gain using the conventional box type loop antenna.

In addition, by using the first and first rectangular plates 6 and 8 on the upper and lower plates as an antenna, not only have a large area but also have low operating impedance, thereby reducing the influence of the surroundings, especially from the human body. Even when carrying a wireless call receiver in a bag, there is an advantage that the reception sensitivity can be prevented from being lowered.

2 shows an equivalent circuit in which the antenna of the present invention is connected to a radio call receiver, wherein points a and b in the equivalent circuit of the loop antenna are connected to the receiver circuit 10 so that the first and first rectangular plates 6 ( The loop antenna La of FIG. 8 and the tuning capacitor C are connected to form a tuning circuit for frequency to supply a reception signal through the antenna to the receiver circuit.

As described above, according to the present invention, the band wireless pager using the first and first rectangular plates outside the receiver as a loop antenna has a low cost and a small size, and does not require an antenna dedicated device. By using a conductor, not only electrostatic and electronic shielding effect is generated, but also mechanically prevents deformation and distortion caused by pressure from the outside, and prevents external stress against impact, thus providing a portable thin cordless call receiver with excellent durability. It can be.

Claims (1)

In the antenna for a wireless call receiver, a copper plate having a coupling hole is formed in the upper portion is the same as the size of the frame on which the circuit board is embedded, the first rectangular plate having a plurality of coupling holes formed on the outer side of the copper plate, and the lower portion of the frame And a second rectangular plate having a protrusion formed at a predetermined portion on one side, and a predetermined portion of the other side coupled to the second rectangular plate, the coupling hole formed in the first and second rectangular plates and the frame, and a screw passing through the protrusion. Antenna for radio call receiver.