KR100581712B1 - Internal Ring Antenna for Mobile Handsets - Google Patents

Abstract

The present invention relates to a ring-type antenna structure for a mobile communication terminal to effectively apply a ring-type antenna that does not require a grounding point in a mobile communication terminal and to provide multi-band or broadband characteristics.

To this end, the present invention is installed spaced apart a predetermined interval in the horizontal direction and vertical direction to provide an electrical length of λ _g / 2 from the ground plane of the PCB board of the mobile communication terminal, having only one feed point and different Ring-shaped radiators that provide resonant frequencies are constructed with dielectric structures to provide electromagnetic clearance, or they may be horizontal and vertical to provide an electrical length of λ _g / 2 from the ground plane of the PCB substrate of the mobile communication terminal. It is provided spaced apart in a predetermined interval in the direction and having a single feeding point and having a resonant frequency adjacent to each other with a ring-shaped radiator provided between the dielectric structure.

Ring antenna, monopole antenna, slot, slit, multi band, wide band

Description

Ring type antenna structure for mobile communication terminal {Internal Ring Antenna for Mobile Handsets}

1 is a view showing a general ring antenna for explaining the present invention,

Figure 2a to 2c is a view showing the structure of a ring antenna mounted on a PCB substrate in the present invention, Figure 2a is a perspective view, Figure 2b is a plan view, Figure 2c is a side view.

3 is an embodiment view showing a ring-shaped radiator bent to at least one side portion of a dielectric instrument in accordance with the present invention;

Figure 4 is an embodiment showing a meander line is formed on the ring-shaped radiator to increase the electrical length according to the present invention,

5A and 5B are a plan view and an exploded perspective view showing a dual ring antenna for implementing a multi band;

Figure 6 is an embodiment showing a state in which one ring radiator is bent to one or more side portions of the dielectric apparatus in the dual ring antenna structure according to the present invention,

7 to 9 are exemplary views showing an antenna formed of a ring-stub, ring-monopole, monopole-ring, etc. in a laminated antenna structure according to the present invention;

10 is a view showing a ring antenna structure having ring radiators having the same or similar resonant frequencies according to another embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

20: ring-shaped radiator 20a: slot,

70: first ring-shaped radiator, 72: second ring-shaped radiator.

The present invention relates to a ring antenna structure for a mobile communication terminal. More specifically, a ring type antenna having no open point in two different currents having opposite phases from a feed point without a ground point is required. The present invention relates to a ring antenna structure for a mobile communication terminal that can be applied to a mobile communication terminal to provide multiband and wideband characteristics.

At present, the miniaturization and integration of various devices included in the mobile communication terminal has made it possible to reduce the overall size of the mobile communication terminal, which is convenient to carry and satisfies the desire of the consumer to have a small size terminal. It is being developed in conflict with a marketing strategy.

However, in minimizing the size of the mobile communication terminal of the small size as described above, a built-in antenna is often used instead of the antenna protruding outward to reduce the overall volume of the mobile communication terminal and to enhance the design. .

As such built-in antennas, inverted-f type antennas, which generally have omni-directional radiation patterns and can provide high gain and wide bandwidth, are widely used.

However, the current inverted F antennas cannot complement the size of the antenna performance. That is, the demand for miniaturization of a mobile communication terminal having a smaller size, an increase in antenna efficiency, a demand for wider bandwidth and a multi-band antenna, a decrease in SAR (Specific Absorbtion Rate), and a human contact The overall need for insensitive antennas could not be met.

On the other hand, although a loop-shaped or ring-shaped antenna based on a magnetic dipole antenna is used as a built-in type, the electrical length of the loop- or ring-shaped built-in antenna is λ _g / 2 or more, which is approximately λ _g / 4 Compared to the inverted-f antenna, which has an electrical length of, it is not widely used because it requires a lot of space constraints in mounting to a mobile communication terminal.

In addition, a slot-type antenna may be used in the mobile communication terminal. The radiating plate is fixedly installed by the ground pin and the feeding pin on the upper side of the PCB board, and the radiating slot is formed at the center portion of the radiating plate, and the feeding line is sealed so that the energy is supplied from the feeding pin. It crosses away from the affected area.

Such a slot serves to reduce the overall size of the antenna by increasing the surface current density flowing through the radiating plate. In this case, the resonance frequency of the slot-type antenna is determined according to the size of the slot.

As described above, only the slot-type antenna, the inverted-f antenna, etc. are applied to the mobile communication terminal, and the loop-type or ring-shaped built-in antenna has been refrained from being used due to the electrical length.

Accordingly, the present invention has been made to solve the above problems, while maintaining the antenna characteristics provided by the conventional built-in antenna, the ring-shaped antenna, which could not be applied due to the spatial constraints of the mobile communication terminal, to the internal space of the mobile communication terminal. It is an object of the present invention to provide a ring antenna structure for a mobile communication terminal that can be effectively mounted.

Another object of the present invention is to provide a broadband characteristic by designing adjacent resonance frequencies provided by a ring radiator in a stacked ring antenna structure.

In addition, another object of the present invention is to provide a multi-band characteristic by combining a ring radiator and a monopole antenna structure to provide different resonant frequencies in a stacked ring antenna structure.

Ring-shaped antenna structure for a mobile communication terminal of the present invention for achieving the above object is spaced a predetermined distance in the horizontal and vertical directions to provide an electrical length of λ _g / 2 from the ground plane of the PCB board of the mobile communication terminal Ring radiators are installed and have only one feed point and provide different intrinsic resonant frequencies, and a dielectric structure for providing electromagnetic clearance between the ring radiators is provided.

In addition, the ring antenna structure for a mobile communication terminal according to another embodiment of the present invention for achieving the above object, in order to provide an electrical length of λ _g / 2 from the ground plane of the PCB substrate of the mobile communication terminal and the vertical direction Ring radiators installed at predetermined intervals in the direction and having only one feeding point and having mutually adjacent resonance frequencies, respectively connected to each other, and provided with a dielectric structure for providing an electromagnetic gap between the ring radiators; The broadband characteristics are provided by the ring radiator.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a view showing a general ring antenna for explaining the present invention, Figure 2 is a view showing the structure of a ring antenna mounted on a PCB substrate.

As shown, the ring antenna 2 is provided with only one feed point 12 for supplying energy to the ring-shaped radiator 10 having a predetermined shape having an opening in the center thereof. This is the part which is distinguished from the loop antenna provided with a feed point and a short point.

That is, unlike a loop antenna, a ring antenna has only one feeding point without a shorting point, and is open from each current classified in the feeding point and having opposite phases in both directions to realize one resonance. An antenna does not have a dot. Therefore, the ring antenna applied to the present invention is different from the conventional ring antenna in which the resonance frequency is determined by the total circumferential length of the ring radiator implemented for each layer in the ring antenna structure of the stacked structure.

Reference numeral 3 is a PCB substrate, and 6 is a dielectric apparatus for providing an electrical gap between the ring-shaped radiator and the PCB substrate.

Such a ring-shaped antenna is divided into 1/2 in the left and right directions when the energy is supplied through the feed point 12 because the feed path is distributed in two paths with the feed point 12 as the central axis, and is fed in phase. The spinning operation is performed at the point where the opposite current cancels.

However, since the ring antenna has no short-circuit point, the ring antenna must be installed at a predetermined distance from the PCB substrate 3 so that the ring antenna can be operated at a wavelength of about λ _g / 2 by providing an optimal image effect.
That is, as shown in FIGS. 2A to 2C, the ring-shaped antenna should be mounted at a predetermined interval from the PCB substrate 3 in the horizontal direction H and the vertical direction V. FIG.
Accordingly, the shape of the PCB of the mobile communication terminal using the ring antenna is more limited than the loop antenna.
Figure 2a to 2c is a view showing the structure of a ring antenna mounted on a PCB substrate in the present invention.
2B and 2C, the radiator 10 including the dielectric instruments is spaced horizontally from the ground plane 3 by H, and the radiator 10 containing the dielectric instruments is viewed from the ground plane when viewed from the side. It can be seen that the installed spaced apart in the vertical direction.

3 is an embodiment view showing a ring radiator bent to one or more side portions of a dielectric instrument in accordance with the present invention.

As shown, it provides a PCB substrate 3, a ring-shaped radiator 20 having a predetermined shape slot 20a therein, and an electromagnetic gap between the PCB substrate 3 and the ring-shaped radiator 20. In order to provide an inherent dielectric constant.

The ring-shaped radiator 20 shows a state in which a portion thereof, for example, a portion of the slot 20a is bent at the side surface of the dielectric instrument 6. Here, the ring-shaped radiator 20 may be bent at one or more side surfaces of the dielectric instrument 6.

Even if the ring-shaped radiator 20 is bent at the side surface of the dielectric instrument 6 as described above, since the electrical length is provided about λ _g / 2, the energy supplied through the feed point 12 is the feed point 12. The radiation operation is performed at the point where the power is distributed in both directions, and the current of opposite phase is canceled.

Figure 4 is an embodiment showing a meander line is formed on the ring-shaped radiator to increase the electrical length according to the present invention.

In the ring antenna of FIG. 4, only the structure of the ring-shaped radiator 30 is differently formed in the configuration shown in FIG. 3, and the dielectric structure 6 is formed by recessing the central portion 32 in which the slot 30a is formed. Consists of patterns.

In addition, the ring-shaped radiator 30 is formed with a slot 30a having a predetermined shape (in the present embodiment, a substantially 'Ｕ' shape) in a state where both ends are closed, and a slit having an open shape. 30a and the slit are used to adjust the electrical length of the ring antenna. That is, the slots 30a and the slits may be provided in various shapes other than the illustrated shapes.

5A and 5B are a plan view and an exploded perspective view showing a dual ring antenna for implementing a multi band.

As shown, a first ring-shaped radiator 70 having a slot 70a therein, a dielectric structure 6 for providing an electrical clearance between the first ring-shaped radiator 70 and the PCB substrate, and a connection portion The second ring-shaped radiator 72 is connected to the first ring-shaped radiator 70 by a medium 13 and the feed line is formed in a ring shape with a slot 72a therein for supplying energy from the feeding point. .

As described above, when the first ring-shaped radiator 70 and the second ring-shaped radiator 72 are provided, they each have a unique resonant frequency to provide multi-band characteristics.

6 is an exemplary view showing a state in which one ring radiator is bent to one or more side portions of the dielectric instrument 6 in a double ring antenna structure according to the present invention.

This provides the antenna characteristics by selectively bending the ring-shaped radiator 80 on one or more side surfaces of the dielectric instrument 6 in order to make full use of the space inside the mobile communication terminal. Even in that case, multiband characteristics are provided because the resonant frequencies of the respective ring-shaped radiators 72 and 80 are provided differently.

Meanwhile, FIGS. 7 to 9 illustrate exemplary embodiments of an antenna formed of a ring stub, a ring-monopole, a monopole-ring, or the like in a multilayer antenna structure according to the present invention.

7 shows that the tuning stub 74 extends in one direction to serve as a tuning stub to the second ring-shaped radiator 72. In this case, when the first ring-shaped radiator 70 is designed at about λ _g / 2 of low frequency and radiated at the designed frequency, the second ring-shaped radiator 72 is operated as a tuning stub 74, and the high frequency band In the antenna radiation is performed in that the current is supplied to the second ring-shaped radiator 72, the current of the two phases cancel each other.

8A and 8B show a ring-monopole antenna in which the ring-shaped radiator 70 and the monopole radiator 100 are connected to each other through a connection part and operated in a multi-band.

Similarly, even when the antenna structure is provided with the positions of the ring-shaped radiator 72 and the monopole radiator 110 changed as shown in FIG. 9, the multiband characteristics are due to different resonance frequencies of the ring-shaped radiator 72 and the monopole radiator 110. Will be provided.

Here, the radiator may be configured to be bent selectively to one or more side surfaces of the dielectric device in order to maximize the internal space of the antenna structure mobile communication terminal in which the ring-shaped radiator and the monopole radiator are combined.

On the other hand, Figure 10 is a view showing a ring antenna structure having a ring radiator having the same or similar resonant frequency with each other according to another embodiment of the present invention.

As shown, a dielectric structure 6 for connecting first and second ring radiators 70 having mutually adjacent resonant frequencies and for providing electromagnetic clearance between the first and second ring radiators 70. In this provided state, it is spaced apart from the PCB substrate in a horizontal direction and a vertical direction as described above.

Then, the first and second ring-shaped radiators 70 can provide a wider range of frequency characteristics than the frequency characteristics of one ring-shaped radiator because the resonant frequency is the same.

As described above, according to the ring-type antenna structure for a mobile communication terminal of the present invention, a ring-type antenna having only one feeding point without using a shorting pin is mounted in the internal space of the mobile communication terminal, or optionally By designing the ring radiator by bending the side surface of the dielectric device, it is possible to appropriately apply a ring antenna, which has been refrained from use due to conventional space constraints.

In addition, the present invention can implement a ring-ring, ring-monopole, ring-stub radiator with a stack in order to implement a multi-band, the advantage that can provide a broadband characteristics by stacking ring radiator adjacent the resonance frequency have.

On the other hand, the present invention is not limited to the above-described specific preferred embodiments, and various changes can be made by those skilled in the art without departing from the gist of the invention claimed in the claims. will be.

Claims (9)

Rings are provided spaced apart from each other in the horizontal and vertical directions to provide an electrical length of λ _g / 2 from the ground plane of the PCB board of the mobile communication terminal. A ring antenna structure for a mobile communication terminal, characterized in that the radiator is laminated in a vertical direction with a dielectric structure interposed therebetween and electrically connected to each other. The method of claim 1, The ring radiator is a ring antenna structure for a mobile communication terminal, characterized in that formed to be bent at least one side of the dielectric structure in order to maximize the internal space of the mobile communication terminal. The method of claim 1, The ring radiator has a ring-shaped antenna structure for a mobile communication terminal, characterized in that different sizes so that different unique resonant frequency is provided. The method of claim 1, The ring radiator is a ring-shaped antenna structure for a mobile communication terminal, characterized in that for controlling the electrical length by using a slot having a predetermined shape formed inside, and an open slit. The method of claim 1, A ring antenna structure for a mobile communication terminal, characterized in that a stub for impedance matching is extended to any one ring radiator of the stacked ring radiators. The method of claim 1, Ring antenna structure for a mobile communication terminal, characterized in that any one of the stacked ring radiators are stacked in a monopole type antenna to operate in a multi-band. The method of claim 6, Any one or both of the stacked ring radiator or monopole type antennas are formed by bending at least one side portion of the dielectric structure. In order to provide an electrical length of λ _g / 2 from the ground plane of the PCB board of the mobile communication terminal, a ring radiator is provided spaced apart from each other in the horizontal direction and the vertical direction by providing a resonance point adjacent to each other with only one feed point. A ring antenna structure for a mobile communication terminal, characterized in that the broadband structure is provided by being laminated in a vertical direction with a dielectric structure interposed therebetween to be electrically connected. The method of claim 8, And the ring radiator is formed by bending at least one side portion of the dielectric structure.

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