KR100575714B1 - Portable terminal device to united antenna - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable terminal having an antenna. In particular, a built-in antenna mounted inside a portable wireless communication terminal for diversity may include a printed circuit-type dual dipole antenna, thereby providing a conventional chip antenna or inverted antenna (Inverted F). Antenna) It is an object to reduce the area occupied in the terminal by reducing the size of the antenna compared to the antenna. The present invention for this purpose is a PCB 310, two dipole antennas 320a and 320b printed in planar form on both sides of the same surface of the PCB 310, and having a structure parallel to the radial direction, and the dipole antenna. Feed lines 340a and 340b that provide feed points to the 320a and 320b and the dipole antennas 320a and 320b, and are located between the feeder lines 340a and 340b and the antenna 320a. And matching circuits 330a and 330b that provide impedance matching between 320b).

Description

PORTABLE TERMINAL DEVICE TO UNITED ANTENNA

1 and 2 are configuration diagrams of a diversity receiving antenna applied to a portable terminal of the prior art.

3 is a structural diagram showing a built-in antenna in an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

310: PCB (printed circuit board) 320a, 320b: dipole antenna

330a, 330b: matching circuit 340a, 340b: feeder

The present invention relates to a portable terminal, and more particularly, to a portable terminal having an antenna.

The necessity of portable mobile communication is increasing not only, but also the demand is increasing so that information transmission through the mobile communication network is increasing. With the necessity of such mobile communication, there is a growing interest in miniaturization, light weight, and efficient use of radio waves in portable terminals that can be carried by individuals.

In addition, countermeasures for multi-path fading, which are emerging as important issues in call quality and high-speed data communication, have emerged as important concerns. Multipath means that a plurality of transmission signals are received by a receiving antenna through a branch path in the air. In addition, when multiple signals are received through different paths, different amplitude attenuation and phase changes occur. When the received signals are combined, the signal strength changes differently from the transmission signal with time, which is called fading.

In general, fading in mobile communication has a significant effect on system performance. As a representative countermeasure against fading, a spatial diversity technique can be considered.

The basic concept of the diversity scheme is a technique used to improve the quality of a received signal in a wireless communication system, and uses two receive antennas at a receiving end. Obtaining multiple fading waves in diversity reception is in addition to making an independent transmission path between the transmitter and the receiver. In other words, the signals received by the two reception antennas may be completely different signals.

In this case, even if a deep fading phenomenon occurs in a signal received at one antenna, a small fading phenomenon occurs in a signal received at the other antenna, so that a good quality call can be provided by selecting a small fading signal to reproduce the signal. In addition, since the timing of deep fading is different from each other, a diversity service can provide better service.

The diversity scheme overcomes fading by receiving and combining multiple signals that are affected by independent fading. Diversity can be broadly classified into macroscopic diversity using long-term log-normal signals and microscopic diversity using short-term Rayleigh signals.

Types of microscopic diversity include space, polarization, angle, frequency, and time diversity (space, polarization, angle, frequency, time diversity).

In addition, the combining methods include selective combining, maximum ratio combining, equal gain combining, feedback, switched combining, and the like.

The selective combining method is a method of selecting the best receiving power among several signals, and the structure is complicated because a receiving circuit for receiving power is required as many as the number of antennas. The maximum ratio combining method is a method in which each signal is combined at the best ratio, and a structure for determining and combining the ratio is complex, which is complicated. The same gain combining method combines signals in the same phase, but it is difficult to match the phase of each signal.

The switched combining method selects one signal and selects another signal when the receiving power is lower than a predetermined level (threshold level). The receiving circuit can measure the receiving power. One is enough. Therefore, the switch coupling method is less efficient, but the structure is simple and inexpensive, so that the practical application is easy.

The portable terminal, which is a representative commercial demand target of mobile communication, is being developed very rapidly such as supporting high speed data communication. On the other hand, in the mobile communication system, other communication entities except for the portable terminal are not limited in size, but the mobile phone needs to be miniaturized and lightweight for the purpose of being portable.

Currently, researches on diversity schemes to be applied to portable terminals have been conducted in mobile communication systems, which aim to provide high-speed data services by reducing the fading effect of received signals by applying diversity schemes to terminals. Therefore, in order to reduce the effects of fading, the base station sends power up, but if diversity is possible in the terminal, the base station does not need to send power up, resulting in a side effect of reducing the base station equipment cost.

Antennas mounted in a conventional portable wireless communication terminal are largely divided into an external antenna and an internal antenna.

As an external antenna that protrudes to the outside, a straight whip or rod antenna, a helical antenna, and a combination of a whip antenna and a helical antenna are used.

The combined technology of the whip antenna and the helical antenna is configured such that the helical antenna is operated when the antenna is inserted and the whip antenna is operated when the antenna is pulled out.

In the case of a built-in antenna, a ceramic chip antenna and an inverted F antenna are used.

FIG. 1 is a diagram illustrating an embodiment of a diversity reception antenna applied to a portable terminal of the related art. As shown in FIG. 1, two external antennas 110 are mounted.

The external antenna 110 is composed of a helical antenna.

FIG. 2 is a block diagram showing another embodiment of a diversity reception antenna applied to a portable terminal according to the related art. As shown therein, one external antenna 210 and one internal antenna 220 are mounted. .

The external antenna 210 is configured as a helical antenna, and the internal antenna 220 is configured as a chip antenna or an inverted F antenna.

However, the prior art has the following problems.

First, the diver seat structure by two external antennas has a structural disadvantage that it is not in harmony with the appearance of the terminal, is inconvenient during storage and use, and can be easily damaged by external shocks.

Second, the diversity antenna structure, which consists of one external antenna and one internal antenna, is difficult to miniaturize the terminal because the antenna occupies the inside of the terminal in the case of the reverse F antenna, and the antenna for the diversity is small in the case of the chip antenna. It is not easy to apply. In addition, the implementation of the antenna requires an additional manufacturing process and additional cost.

Accordingly, there is a need for a diversity antenna and a small, lightweight, and low-cost internal antenna that can solve the above-described problems and support various wireless data communication services.

Accordingly, the present invention aims to create a structure in which a printed circuit-type dual dipole antenna is combined as an internal antenna mounted inside the portable terminal for diversity in order to improve the conventional problem. Provided is a portable terminal having an antenna capable of reducing the area occupied in the terminal by reducing the size of the antenna as compared to an Inverted F Antenna.

In order to achieve the above object, the two dipole antennas are arranged on both sides of one side of the printed circuit board (PCB) such that two printed circuit dipole antennas each having two planar patterns are formed in the longitudinal direction are symmetrical. It is printed in a planar form, and for matching each of the two feed lines and the two dipole antennas is characterized in that the configuration by inserting two matching circuits between the dipole antenna and the feed.

The matching circuit may be configured as a circuit to which a matching technique such as a balloon is applied.

In addition, the present invention is to print two printed circuit dipole antennas each having two planar patterns in the longitudinal direction in order to achieve the above object on the same side of the PCB, so that the two dipole antennas are located perpendicular to each other One antenna is printed on the end surface of the PCB in a planar shape and the other antenna is characterized in that it is configured by printing in a planar shape so as to be perpendicular to the antenna.
In order to achieve the above object, the present invention provides a printed circuit board, at least two dipole antennas printed in a planar shape on the substrate, and having a structure parallel to the radial direction, and the at least two dipole antennas. A feed line providing a point and a matching circuit located between the at least two dipole antennas, the matching circuit providing impedance matching between the feed line and the antenna, wherein the matching circuit is configured to increase an operating bandwidth of the dipole antenna. It is characterized by the configuration.

Therefore, the present invention reduces the mounting area by mounting a dipole antenna on a printed circuit board (PCB), and further reduces manufacturing costs by eliminating additional components and manufacturing processes.

Hereinafter, the present invention will be described in detail with reference to the drawings.

3 is a structural diagram of a built-in antenna in an embodiment of the present invention, as shown therein, two dipole antennas 320a printed in a planar shape on both sides of the same side of the PCB 310 and having a structure parallel to the radial direction. And a feed line 340a and 340b for providing feed points to the two dipole antennas 320a and 320b, and the two dipole antennas 320a and 320b. And matching circuits 330a and 330b that provide impedance matching between the 340a and 340b and the two dipole antennas 320a and 320b.

The matching circuits 330a and 330b are constituted by a balloon circuit.

Referring to the operation and effect of the embodiment of the present invention configured as described above are as follows.

The printed circuit type dipole antennas 320a and 320b, which are divided into two on both sides of the matching circuits 330a and 330b, are parallel to each other in the radial direction. 310 is printed on both sides of the same side of the same plane.

Therefore, the dipole antennas 320a and 320b are printed on the PCB 310 in a planar manner, and thus the electromagnetic wave effects can be significantly reduced as compared to the case in which the antenna is mounted on the terminal. That is, by attaching the dipole antennas 320a and 320b in a planar manner by PCB printing technology, the effect of electromagnetic waves on the brain can be significantly reduced compared to the case where the antenna is mounted on the upper portion of the terminal.

A dipole antenna (doublet antenna) is an antenna that acts like a dipole when the length of the antenna is shorter than half of the wavelength, the polarity of the linear potential distribution on the top, bottom, left and right sides of the antenna is always reversed. The dipole antenna 320a operates as a main antenna for both transmission and reception, and the dipole antenna 320b operates as a reception antenna for diversity.

Therefore, by adjusting the length and width of the dipole antennas 320a and 320b to maintain the optimum matching state, broadband and high gain can be obtained.

In addition, between the dipole antennas 320a and 320b and the microstrip feeds 340a and 340b for matching the microstrip feed lines 340a and 340b with the dipole antennas 320a and 320b. Matching circuits 330a and 330b, such as a balloon, are inserted into each other. A balun (balance to unbalance circuit) means a matching device used to connect balanced lines such as parallel two wires and unbalanced lines such as coaxial lines. For example, a single tone signal may be 180 degrees out of phase. You can execute the function of printing.

Therefore, the matching circuits 330a and 330b are inserted to allow the dipole antennas 320a and 320b to secure sufficient bandwidth in the operating frequency band.

In addition, another embodiment of the present invention configures the dipole antennas 320a and 320b symmetrically inserted into the PCB 310 in FIG. 3 to be perpendicular to each other.

For example, the dipole antenna 320b is printed so as to be perpendicular to the dipole antenna 320a to be configured to operate in polarized diversity. At this time, the dipole antenna 320b does not print at a position too close to the dipole antenna 320a, but prints at an appropriate position on the printed circuit board 310.

Accordingly, since the dipole antennas 320a and 320b are vertically positioned and operate in polarization diversity, the dipole antennas 320a and 320b can be operated as a polarized delay distributed antenna system that can reduce fading by using a distributed transmitter method using vertical and horizontal polarizations.

As described in detail above, the present invention can reduce the overall size of the terminal by printing the antenna on a printed circuit board (PCB) and can reduce the effects of electromagnetic waves compared to the conventional built-in antenna.

In addition, the present invention, unlike the existing built-in antenna, by printing the antenna at the same time when manufacturing a printed circuit board, there is an effect that no additional parts and manufacturing process is unnecessary and manufacturing cost can be reduced.

Claims (8)

delete delete delete delete Printed circuit boards, At least two dipole antennas printed in a planar shape on the substrate and having a structure parallel to the radial direction; A feed line providing a feed point to the at least two dipole antennas; And a matching means located between the at least two dipole antennas and providing matching means between the feed line and the antenna. 6. A portable terminal having an antenna according to claim 5, wherein the matching means increases the operating bandwidth of the dipole antenna.  6. The portable terminal of claim 5, wherein one of the at least two dipole antennas is used for transmission and reception, and the other is used as a reception antenna for diversity. The portable terminal of claim 5, wherein the matching means comprises a balloon circuit.

Images