KR100714201B1 - Ultra wide-band antenna - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an ultra wide-band antenna suitable for inducing antenna resonance at a wide frequency and improving characteristics at a specific frequency. The present invention relates to a dielectric substrate and a front face having a rectangular parallelepiped patch structure formed on the front surface of the dielectric substrate. A metal conductor, a power feeding metal conductor formed on one side of the front surface of the dielectric substrate to short-circuit the front metal conductor, a grounding metal conductor formed on the other side of the dielectric substrate front surface, and a rectangular parallelepiped patch structure formed on the back surface of the dielectric substrate. Phosphorous back metal conductor, the front metal conductor and the back metal conductor penetrate in a cylindrical or semi-cylindrical shape, and the side is coated with metal to electrically short the front metal conductor and the back metal conductor to increase the inductive component of the antenna. Include. According to the present invention, since the metal conductor of the feed portion and the metal conductor of the ground portion are present on the same plane, and the front and back metal conductors have a rectangular parallelepiped patch structure, it can greatly contribute to antenna miniaturization. In spite of this miniaturization, the present invention not only has a wide resonance band but can also select a plurality of tuning points, thereby enabling selective use in a required use frequency band.

Microstrip Line, Return Loss, V.S.W.R.

Description

Super wideband antenna {ULTRA WIDE-BAND ANTENNA}

1A and 1B illustrate one form of an ultra wideband antenna according to the prior art,

2a and 2b show another form of ultra-wideband antenna according to the prior art,

3A to 3E are perspective views of an ultra broadband antenna according to an embodiment of the present invention;

4A to 4E are perspective views of an ultra wideband antenna according to another embodiment of the present invention;

5A to 5E are perspective views of an ultra wideband antenna according to another embodiment of the present invention;

6A to 6C are perspective views of an ultra wideband antenna according to another embodiment of the present invention;

7A and 7B are perspective views of an ultra wideband antenna according to another embodiment of the present invention;

8 is an exemplary view of a metal conductor structure deformable according to a preferred embodiment of the present invention;

9A is a graph showing return loss for the ultra wideband antenna of FIGS. 3A to 3E;

FIG. 9B illustrates the V.S.W.R. for the ultra wideband antenna of FIGS. 3A-3E. Graph showing characteristics,

FIG. 9C is a graph showing radiation pattern characteristics of the ultra wideband antenna of FIGS. 3A to 3E;

10A and 10B show return loss, V.S.W.R. for the ultra wideband antenna of FIGS. 6A-6C. A graph showing each characteristic,

10C and 10D are graphs illustrating radiation pattern characteristics of the ultra wideband antennas of FIGS. 6A to 6C, respectively.

11A and 11B illustrate a return loss when a via hole of a feed portion of a via hole on a helical metal conductor 624 and a via hole on an antenna front metal conductor 610 is removed in the ultra wideband antenna of FIGS. 6A to 6C. A graph showing each characteristic,

11C and 11D are graphs illustrating radiation pattern characteristics of the helical metal conductor 624 and the via hole of the feed hole of the via hole on the antenna front metal conductor 610 of the ultra wideband antenna of FIGS. 6A to 6C, respectively. .

<Explanation of symbols for the main parts of the drawings>

300, 400, 500, 600, 700: antenna

302, 402, 502, 602, 702: metal conductor for power supply

304, 404, 504, 604: Cable

306, 406, 506, 606, 706: Grounding metal conductor

308, 408, 508, 608, 708: dielectric substrate

310, 410, 510, 610, 710: antenna front metal conductor

312, 412, 512, 612, 712: Via Hole

314, 414, 514, 614, 714: antenna back metal conductor

416, 516, 716: Microstrip Lines

520: Connector

522: slot

624: helical metal conductor

TECHNICAL FIELD The present invention relates to antennas, and in particular to ultra wide-band antennas, which are suitable for inducing antenna resonance at broadband frequencies and for improving characteristics at certain frequencies.

Antennas, for example, antennas used in mobile communication services, serve to receive electromagnetic waves in free space or in any medium, or to transmit electrical signals generated from a communication device to the outside. Dipole or monopole types with a degree length can be mentioned.

In general, antennas capable of inducing resonance in a wide band include Horn antennas and Vivaldi antennas, but these types of antennas have broadband characteristics, while the antenna structure is large, complex, and low-cost. There is a problem in that it is not suitable for the application of small devices because mass production is not easy and particularly has a directional pattern.

As a part of the prior art to solve this problem, Korean Patent Publication No. 2004-0054107 proposed a small planar antenna manufacturing technique in which the input impedance matching circuit is not required and the frequency bandwidth of the input impedance has ultra-wideband characteristics. .

Briefly looking at the ultra-wideband small planar antenna manufacturing technology disclosed in Korean Patent Laid-Open Publication No. 2004-0054107, there is a monopole radiating element on the front side of the substrate, and the radiating element connected to two or more monopoles on the other back side is symmetrically. In the center, a line having a predetermined length having a predetermined width is formed to form a feed line of a monopole radiating element on the front side, thereby providing an ultra-wideband small antenna having a simple structure.

Such a conventional antenna structure has a power feeding structure at a terminal end of the antenna, and the metal conductor of the feed portion and the metal conductor of the ground portion exist on different planes based on the dielectric.

Meanwhile, FIGS. 1A and 1B illustrate another technique for a conventional ultra-wideband small antenna, and include Schantz, H.G .; Wolenec, G .; A partial excerpt from the article "Frequency notched UWB antennas; Ultra Wide-band Systems and Technologies, 2003 IEEE Conference on, 16-19 Nov. 2003, Pages: 214-218" proposed by Myszka, E.M., III, et al.

Figure 1a shows the antenna structure presented in this paper, Figure 1b is a graph showing the antenna characteristics presented in this paper. As shown in Figs. 1A and 1B, the antenna proposed in this paper induces antenna broadband resonance by giving a slot in a circular patch on the same plane of one dielectric.

On the other hand, Figures 2a and 2b is for explaining another technique for a conventional ultra-wideband small antenna, Yazdandoost, K.Y .; An excerpt from the paper "Ultra wide-band antenna; Communications Magazine, IEEE, Volume: 42, Issue: 6, June 2004, Pages: S29-S32", proposed by Kohno, R. et al.

Figure 2a shows the antenna structure presented in this paper, Figure 2b is a graph showing the antenna characteristics presented in this paper. As shown in Figs. 2A and 2B, the antenna proposed in this paper induces antenna broadband resonance through a trumpet-shaped patch on the same plane of one dielectric.

It is noteworthy that the conventional antenna structure as described above has been miniaturized to be suitable for a mobile communication device while inducing resonance in a wide band, but it is not easy to optimize the antenna in a user's desired use environment and is still unsatisfactory in its size. This has the disadvantage of being present.

For example, an antenna is a passive element, and unlike other circuits, its characteristics vary greatly depending on the surrounding environment. Therefore, the antenna needs to be changed in various ways according to the application environment. Considering that the size of the antenna is getting smaller, the miniaturization of the antenna size is an ongoing research and development task.

The present invention is the result obtained by considering and developing the above-described needs, the metal conductor of the feed portion of the antenna and the metal conductor of the ground portion to exist on the same plane and minimize the size by using via holes or side metal conductors The purpose is to provide an ultra-wideband antenna.

Another object of the present invention is to provide an ultra-wideband antenna in which a metal conductor pattern is formed on the same plane in the form of a patch of a rectangular parallelepiped and minimized in size by using a via hole or a side metal conductor.

It is still another object of the present invention to provide an ultra wideband antenna capable of adaptively adapting to various environments by applying at least one modified patch structure to a metal conductor pattern in addition to a rectangular patch shape.

Another object of the present invention is to provide an ultra-wideband antenna to improve frequency characteristics in a specific band by applying a helical metal conductor or pattern on the antenna.

According to an embodiment of the present invention for achieving this object, an antenna having an ultra-wide frequency bandwidth and omni-directional radiation pattern characteristics, and a dielectric substrate, a front metal conductor formed of a patch structure in the form of a rectangular parallelepiped on the front surface of the dielectric substrate; And a back metal conductor formed in a rectangular parallelepiped patch structure on the back surface of the dielectric substrate, a metal conductor for power supply formed on one side of the front surface of the dielectric substrate to short-circuit the front metal conductor, and formed on the other side of the front surface of the dielectric substrate. Provided is an ultra-wideband antenna including a grounding metal conductor, and a via hole penetrating through the front metal conductor and the back metal conductor and coated on a side thereof with a metal.

According to another embodiment for achieving the object of the present invention, there is provided an antenna having an ultra-wideband bandwidth and omnidirectional radiation pattern characteristics, a dielectric substrate, a front metal conductor formed in a patch structure in the form of a rectangular parallelepiped on the front surface of the dielectric substrate, A back metal conductor formed in a rectangular parallelepiped patch structure on the back surface of the dielectric substrate, a microstrip line on one side of the front surface and the back surface of the dielectric substrate, and a power supply metal conductor that short-circuits the front metal conductor to supply power, and the dielectric material Provided is an ultra-wideband antenna including a grounding metal conductor partially formed on the back surface of the substrate, and a slot configured to include the power feeding metal conductor in the grounding metal conductor to adjust the antenna characteristics.

According to another embodiment for achieving the object of the present invention, an antenna having ultra-wide frequency bandwidth and omni-directional radiation pattern characteristics, the front surface of the dielectric substrate and the front metal conductor formed of a patch structure in the form of a rectangular parallelepiped on the front surface of the dielectric substrate; And a helical metal conductor fixedly connected to the front metal conductor, a first back metal conductor formed in a patch structure having a rectangular parallelepiped shape on the rear surface of the dielectric substrate to face the front metal conductor, and the dielectric substrate. A second back metal conductor formed in a patch structure having a rectangular parallelepiped shape in a second back surface of the substrate; a power supply metal conductor formed on one side of the front surface of the dielectric substrate to short-circuit the front metal conductors; and a front surface of the dielectric substrate. A ground metal conductor formed on the other side, the front metal conductor and the first back metal conductor are cylindrical An ultra-wideband antenna is provided that includes via holes penetrating through and coated with metal on its side.

According to another embodiment for achieving the object of the present invention, an antenna having an ultra-wideband frequency bandwidth and an omnidirectional radiation pattern characteristics, comprising: a dielectric substrate, a first front metal conductor formed in the front first region of the dielectric substrate; And a second front metal conductor patterned in a helical shape on a second front surface of the dielectric substrate, a first back metal conductor formed in a patch structure in a rectangular parallelepiped shape on a first rear surface of the dielectric substrate, and a rear surface of the dielectric substrate. A second back metal conductor patterned in a helical shape in a second region, a power supply metal conductor formed at one side of the front surface of the dielectric substrate to short-circuit the front metal conductor, and a ground formed at the other front side of the dielectric substrate; The metal conductor, the second front metal conductor and the second back metal conductor in a cylindrical shape, the side of which is a metal Second to provide a wide-band antenna comprising a via hole which is applied to.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

3A to 3E are diagrams illustrating an ultra wideband antenna structure according to an embodiment of the present invention.

First, Figure 3a is a perspective view of an ultra-wideband antenna according to an embodiment of the present invention, a metal conductor 302 for power supply is provided on the front surface of the antenna 300 based on the dielectric substrate 308, The dedicated metal conductor 302 is connected to the power feeding metal conductor 302 ′ inside the cable 304. That is, the feeding structure of the antenna according to the present embodiment is a structure in which the front surface of the antenna 300 is fed, and can be used by connecting the cable 304 according to the application environment.

FIG. 3B is a front view of FIG. 3A, and FIG. 3C is a rear view of FIG. 3A. As shown in FIG. 3B, the ultra-wideband antenna according to the present embodiment is characterized in that the power supply metal conductor 302 and the ground metal conductor 306 coexist on the antenna front metal conductor 310. According to this structure, the size of the antenna may be further minimized.

In this case, when an antenna having a structure as shown in FIG. 3A is applied on a PCB, the power supply metal conductor 302 is electrically shorted with a signal line directly supplied from an RF module, and the position of the ground metal conductor 306 is variable. do.

3D and 3E are front and rear views when the via hole or the side metal conductor is applied to the antenna of FIG. 3A.

As shown in FIGS. 3D and 3E, the ultra-wideband antenna 300 according to the present embodiment passes through a cylindrical shape between the antenna front metal conductor 310 and the antenna back metal conductor 314 in a cylindrical shape, and the metal on the cylindrical side thereof. The via-hole 312 is formed to be applied to the antenna front metal conductor 310 and the antenna back metal conductor 314 is characterized in that the electrical short.

That is, since the antenna back metal conductor 314 is electrically shorted to the antenna front metal conductor 310 and the via hole 312, the antenna 300 according to the present embodiment increases the inductive component and resonates the frequency. Lowering contributes more to the miniaturization of the antenna. In this case, although the via hole 312 has been described as being circular in FIGS. 3D and 3E, the shape of the via hole 312 is not limited thereto, and the purpose of the via hole is to induce an electrical short between the front metal conductor and the back metal conductor. For example, a semi-circle via hole may be used.

Meanwhile, the antenna structure of FIGS. 3D and 3E is a via hole 312 which penetrates the front and rear surfaces of the antenna in a cylindrical shape and is coated with metal on the cylindrical side to apply the mobile communication service, and the antenna front metal conductor 310 and the antenna. The back metal conductor 314 is electrically shorted, but this structure is applied when the antenna is a rectangular parallelepiped dielectric substrate 308 (solid form), and the front metal conductor and the back metal conductor are formed of a dielectric substrate ( In the case of forming an “air layer” instead of 308), the present embodiment may be applied to a simple electrical short of a metal conductor rather than a via hole.

4A to 4E are diagrams illustrating an ultra wideband antenna structure according to another embodiment of the present invention.

First, Figure 4a is a perspective view of an ultra-wideband antenna according to another embodiment of the present invention, a metal conductor 402 for power supply is provided on the front surface of the antenna 400, based on the dielectric substrate 408, this metal conductor for power supply 402 is connected to an external cable 404. That is, the feeding structure of the antenna according to the present embodiment is a structure in which the front surface of the antenna 400 is fed, and can be used by connecting the cable 404 according to the application environment. The difference from the embodiment of FIG. 3 described above is that the external cable 404 is connected in the horizontal direction of the antenna 400.

4B is a front view of FIG. 4A, and FIG. 4C is a rear view of FIG. 4A. As shown in FIG. 4B, the ultra-wideband antenna according to the present embodiment is characterized in that the power supply metal conductor 402 and the ground metal conductor 406 coexist on the antenna front metal conductor 410. According to this structure, the size of the antenna may be further minimized.

In this case, compared with the embodiment of FIG. 3B, the present embodiment constitutes a feed line in the form of a microstrip line 416. That is, when the antenna structure according to the present embodiment is applied to a PCB, a metal conductor is designed as a microstrip line 416 (or Co-Planar Waveguide) and electrically shorted to a signal line directly supplied from an RF module. And a power supply by shorting the metal conductor 410 on the antenna, and reference numeral 418 electrically shorts the microstrip line 416 and the front metal conductor 410 to indicate a separation distance for 50Ω matching.

In addition, when an antenna having a structure as shown in FIG. 4A is applied on a PCB, the power supply metal conductor 402 is electrically shorted with a signal line directly supplied from an RF module, and the position of the ground metal conductor 406 is variable. do.

4D and 4E are front and rear views when the via hole or the side metal conductor is applied to the antenna of FIG. 4A.

As shown in FIGS. 4D and 4E, the ultra-wideband antenna 400 according to the present embodiment has a cylindrical shape between the antenna front metal conductor 410 and the antenna back metal conductor 414 in a cylindrical shape, and the metal on the cylindrical side thereof. The via-hole 412 is coated to form an electrical short circuit between the antenna front metal conductor 410 and the antenna back metal conductor 414.

That is, the antenna back metal conductor 414 is electrically shorted to the antenna front metal conductor 410 and the via hole 412, so that the antenna 400 according to the present embodiment increases the inductive component and lowers the resonance frequency. It can contribute more to the miniaturization of. In this case, although the via hole 412 is described as being circular in FIG. 4D and FIG. 4E, the shape of the via hole 412 is not limited thereto, but the purpose of the via hole is to induce an electrical short circuit between the front metal conductor and the back metal conductor. For example, a semi-circle via hole may be used.

Meanwhile, the antenna structure of FIGS. 4D and 4E is a via hole 412 that penetrates the front and rear surfaces of the antenna in a cylindrical shape and is coated with metal on the cylindrical side to apply the mobile communication service, and the antenna front metal conductor 410 and the antenna. Although the back metal conductor 414 is electrically shorted, such a structure is applied when the antenna is a rectangular parallelepiped dielectric substrate 408 (solid form), and the front metal conductor and the back metal conductor form a dielectric substrate ( In the case of forming an "air layer" instead of 408, the present embodiment may be applied to a simple electrical short of a metal conductor rather than a via hole.

5A to 5E are diagrams illustrating an ultra wideband antenna structure according to another embodiment of the present invention.

First, Figure 5a is a perspective view of an ultra-wideband antenna according to another embodiment of the present invention, a metal conductor 502 for power supply is provided on the front surface of the antenna 500, based on the dielectric substrate 508, the metal for power supply The conductor 502 is connected with the external connector 520. That is, the feeding structure of the antenna according to the present embodiment is a structure in which the front surface of the antenna 500 is fed, and can be used by connecting the connector 520 according to the application environment.

FIG. 5B is a front view of FIG. 5A and FIG. 5C is a rear view of FIG. 5A.

As illustrated in FIG. 5B, the ultra-wideband antenna according to the present embodiment has a structure in which a power feeding metal conductor 502 is formed on an antenna front metal conductor 510, and the power feeding metal conductor 502 is a microstrip. Electrically shorted to front metal conductor 510 by line 516.

Reference numeral 518 denotes a separation distance for 50Ω matching by electrically shorting the microstrip line 516 and the front metal conductor 510.

In addition, a first via hole 512 ′ is formed at the right side of the front metal conductor 510 as shown in FIG. 5B. As described above, the first via hole 512 ′ penetrates the front / back of the antenna 500 in a cylindrical shape, and is coated with metal on the cylindrical side to electrically connect the metal conductors on the front surface and the metal conductors on the back surface. Short circuit.

5C is a rear view of the ultra-wideband antenna according to the present embodiment, characterized in that the power feeding metal conductor 502 and the grounding metal conductor 506 coexist on the same plane. According to this structure, the size of the antenna may be further minimized. In this case, the grounding metal conductor 506 is formed on a portion of the dielectric substrate 508, and the slot 522 is formed in the grounding metal conductor 506 to include the power feeding metal conductor 502. To adjust the frequency characteristic of 500).

5D and 5E are front and rear views when the second via hole or the side metal conductor is applied to the antenna 500 of FIG. 5A.

As shown in FIGS. 5D and 5E, the ultra-wideband antenna 500 according to the present embodiment has a cylindrical shape between the antenna front metal conductor 510 and the antenna back metal conductor 514 in a cylindrical shape, and the metal on the cylindrical side thereof. The antenna via metal conductor 510 and the antenna back metal conductor 514 are electrically shorted by forming the second via hole 512 applied to the antenna.

That is, the antenna back metal conductor 514 is electrically shorted to the antenna front metal conductor 510 and the first and second via holes 512 and 512 ', so that the antenna 500 according to the present embodiment is an inductive component. It is possible to contribute more to the miniaturization of the antenna by increasing the frequency and lowering the resonance frequency.

In this case, although the via holes 512 and 512 'are described as being circular in FIGS. 5B to 5E, the via holes 512 and 512' are not limited thereto. Since the via holes are intended to induce an electrical short between the front metal conductor and the back metal conductor, the other holes are different. It is also possible to use a via hole in the form of a semicircle, for example.

Meanwhile, the antenna structure of FIGS. 5B to 5E includes via holes 512 and 512 ′ which penetrate the front and rear surfaces of the antenna in a cylindrical shape and are coated with metal on the cylindrical side to apply the mobile communication service. 510 and the antenna back metal conductor 514 are electrically shorted, but this structure is applied when the antenna is a rectangular parallelepiped substrate (solid form) in the antenna design, and the front metal conductor and the back metal conductor are "air layers". In the case of forming “,” the present embodiment may be applied to a simple electrical short of a metal conductor rather than a via hole.

6A to 6C are perspective views of an ultra wideband antenna according to another embodiment of the present invention, in which a helical metal conductor is applied.

First, as shown in FIG. 6A, the ultra-wideband antenna 600 according to the present embodiment has one side connected to an external cable 604 based on the dielectric substrate 608, and the other side of which is a helical metal conductor. 624. By applying such a helical metal conductor 624, it is possible to improve the frequency characteristics in a specific band.

FIG. 6B is a front view of FIG. 6A, and FIG. 6C is a rear view of FIG. 6A. As shown in FIG. 6B, the ultra-wideband antenna 600 according to the present embodiment is characterized in that the power supply metal conductor 602 and the ground metal conductor 606 coexist on the antenna front metal conductor 610. do. According to this structure, the size of the antenna may be further minimized.

6B and 6C, via holes or side metal conductors are applied to the antenna 600 in this embodiment. That is, the antenna front metal conductor 610 and the antenna back metal conductor 614 penetrate in a cylindrical shape, and form a via hole 612 coated with metal on the cylindrical side to form the antenna front metal conductor 610 and the antenna back metal. The conductor 614 is characterized in that it is electrically shorted.

That is, the antenna back metal conductor 614 is electrically shorted to the antenna front metal conductor 610 and the via hole 612, so that the antenna 600 according to the present embodiment increases the inductive component and lowers the resonance frequency. It can contribute more to the miniaturization of. 6B and 6C, the via hole 612 is described as being circular, but is not necessarily limited thereto. Since the purpose of the via hole is to induce an electrical short between the front metal conductor and the back metal conductor, another form, for example, may be described. For example, a semi-circle via hole may be used.

Meanwhile, the antenna structure of FIGS. 6B and 6C is a via hole 612 that penetrates the front and rear surfaces of the antenna in a cylindrical shape and is coated with metal on the cylindrical side to apply the mobile communication service, and the antenna front metal conductor 610 and the antenna. Although the back metal conductor 614 is electrically shorted, this structure is applied when the antenna is a rectangular parallelepiped dielectric substrate 608 (solid form), and the front metal conductor and the back metal conductor are formed of a dielectric substrate ( In the case where the air layer is formed instead of 608, the present embodiment may be applied to a simple electrical short of a metal conductor rather than a via hole.

On the other hand, in the case of the back metal conductor 614 ', an electrical coupling is formed without being electrically shorted with other metal conductors, thereby increasing the capacitive component of the input impedance to improve antenna radiation efficiency. And expand the resonance band.

In this case, the back metal conductor 614 may be designed for various purposes according to the use environment, and the antenna inductive component may not be increased or removed by removing the via hole of the feed portion on the back metal conductor 614. Not increase the capacitive component.

7A and 7B are perspective views of an ultra-wideband antenna according to still another embodiment of the present invention, respectively, showing front and rear surfaces thereof.

7, the power feeding metal conductor 702 and the grounding metal conductor 706 coexist on the antenna front metal conductor 710 based on the dielectric substrate 708 as in the above-described embodiments. It is done. According to this structure, the size of the antenna may be further minimized. The difference from the embodiment of FIG. 6 described above is that instead of using the helical metal conductor, the metal pattern is designed in the helical shape on the PCB. However, such a helical metal pattern is formed on a part of the front metal conductor 710.

In addition, the present embodiment constitutes a feed line in the form of a microstrip line 716. When the antenna structure according to the present embodiment is applied to a PCB, it is designed as a microstrip line 716 (or CPW). The power may be supplied by shorting the metal conductor 710 on the antenna and the metal conductor electrically shorted with the signal line supplied directly from the RF module.

In addition, as shown in FIGS. 7A and 7B, a via hole or a side metal conductor is applied to the antenna 700 in this embodiment. That is, the antenna front metal conductor 710 and the antenna back metal conductor 714 penetrate in a cylindrical shape, and form a via hole 712 coated with metal on the cylindrical side to form the antenna front metal conductor 710 and the antenna back metal. The conductor 714 is characterized in that it is electrically shorted.

That is, the antenna back metal conductor 714 is electrically shorted to the antenna front metal conductor 710 and the via hole 712, so that the antenna 700 according to the present embodiment increases the inductive component and lowers the resonance frequency. It can contribute more to the miniaturization of. In this case, although the via hole 712 is described as being circular in FIGS. 7A and 7B, the shape of the via hole 712 is not limited thereto. The purpose of the via hole is to induce an electrical short circuit between the front metal conductor and the back metal conductor. For example, a semi-circle via hole may be used.

Meanwhile, the antenna structure of FIGS. 7A and 7B is a via hole 712 that penetrates the front and rear surfaces of the antenna in a cylindrical shape and is coated with metal on the cylindrical side to apply the mobile communication service, and the antenna front metal conductor 710 and the antenna. The back metal conductor 714 is electrically shorted, but this structure is applied when the antenna is a rectangular parallelepiped dielectric substrate 708 (solid form), and the front metal conductor and the back metal conductor are formed of a dielectric substrate ( In the case of forming an “air layer” other than 708, the present embodiment may be applied to a simple electrical short of a metal conductor rather than a via hole.

On the other hand, in the case of the back metal conductor 714 ', an electrical coupling is formed without being electrically shorted with other metal conductors, thereby increasing the capacitive component of the input impedance, thereby improving antenna radiation efficiency and extending the resonance band. To make it possible.

8 is an example attempt of a deformable metal conductor structure in accordance with a preferred embodiment of the present invention. In the present invention, it is possible to implement an ultra-wideband antenna by selectively applying any one of various metal patterns as described above. In this case, the metal patterns of Figure 8 is characterized in that it is equally applicable to the front metal conductor and the bottom metal conductor of the antenna.

9A is a graph illustrating return loss of the ultra wideband antennas of FIGS. 3A to 3E. FIG. 9B is a characteristic of standing wave ratio (VSWR) of the ultra wideband antennas of FIGS. 3A to 3E. Figure 9c is a graph showing the radiation pattern characteristics for the ultra-wideband antenna of Figures 3a to 3e.

As shown in FIGS. 9A to 9C, the antenna proposed in the present invention can be used in a wide band, and the radiation pattern characteristic is good because the radiation pattern has omni-direction in the resonance band. .

These characteristics are equally applicable to the embodiments of FIGS. 4 and 5, and only the embodiments of FIGS. 4 and 5 are designed to variously apply the shape of the metal pattern according to user requirements.

10A and 10B show return loss, V.S.W.R. for the ultra wideband antenna of FIGS. 6A-6C. 10C and 10D are graphs showing radiation pattern characteristics of the ultra-wideband antenna of FIGS. 6A to 6C, respectively.

As shown in Figure 10a to 10d, the antenna proposed in the present invention can be used in a specific band by changing the structure to induce resonance at the user desired frequency, radiation pattern in the resonance band because the radiation pattern has omni-directional It can be seen that the characteristics are good.

These characteristics apply equally to the embodiment of FIG. 7, but only the embodiment of FIG. 7 is designed to help the manual improvement of the manufacturing process by using a similar metal pattern on the PCB without using a helical metal conductor. .

11A and 11B illustrate a return loss when a via hole of a feed portion of a via hole on a helical metal conductor 624 and a via hole on an antenna front metal conductor 610 is removed in the ultra wideband antenna of FIGS. 6A to 6C. Each graph shows the characteristics.

11C and 11D illustrate radiation pattern characteristics of the helical metal conductor 624 and the via hole of the feed portion of the via hole on the antenna front metal conductor 610, respectively, in the ultra wideband antennas of FIGS. 6A to 6C. The graph shown.

As can be seen in Figures 11a to 11d, the antenna according to the present embodiment can be used in a specific band by changing the structure to induce resonance at a frequency desired by the user, since the radiation pattern in the resonance band has omni-directional It can be seen that the radiation pattern characteristics are good.

While many details are set forth in the foregoing description, they should be construed as illustrative of preferred embodiments, rather than to limit the scope of the invention. For example, it will be apparent to those skilled in the art that the present invention may be practiced by variously modifying the pattern of the metal conductor. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined by the technical spirit described in the claims.

According to the present invention, it has a wide resonance band compared to the miniaturized antenna size, and can be easily applied to various commercial systems through one antenna, and can satisfy various needs of a user in a specific band. In addition, in order to adjust the resonant frequency to the desired frequency, a process called "tuning" is performed. According to the present embodiment, several tuning points can be selected to facilitate such tuning work. Selective use in the frequency band is possible. In addition, the present invention has the effect that not only the performance in each resonant band is good but also the radiation pattern is omnidirectional.

Claims (14)

delete delete delete delete delete An antenna having an ultra-wide frequency bandwidth and an omnidirectional radiation pattern, A dielectric substrate, A front metal conductor formed of a rectangular parallelepiped patch structure on the front surface of the dielectric substrate; A first rear metal conductor formed in a patch structure in the form of a rectangular parallelepiped in the first rear surface of the dielectric substrate to face the front metal conductor; A second rear metal conductor formed in a patch structure having a rectangular parallelepiped shape in a second rear surface of the dielectric substrate; A metal conductor for power supply formed on one side of the front surface of the dielectric substrate to short-circuit and feed the front metal conductor; A grounding metal conductor formed on the other front side of the dielectric substrate; A via hole penetrates the front metal conductor and the first back metal conductor and has a side surface coated with metal. Ultra broadband antenna comprising a. The method of claim 6, And the via hole electrically shorts the front metal conductor and the first back metal conductor to increase an inductive component of the antenna. The method of claim 6, And wherein the second backside metal conductor is electrically shorted with the front side metal conductor to form an electrical bond to increase the capacitive component of the input impedance. The method of claim 6, And the antenna is electrically shorted to the power feeding metal conductor by an external cable and includes a helical metal conductor fixedly connected to the front metal conductor. An antenna having an ultra-wide frequency bandwidth and an omnidirectional radiation pattern, A dielectric substrate, A first front metal conductor formed in a patch structure having a rectangular parallelepiped shape in a first front area of the dielectric substrate; A second front metal conductor patterned in a helical shape on a second front area of the dielectric substrate; A first rear metal conductor formed in a patch structure in the form of a cuboid on the rear first region of the dielectric substrate; A second rear metal conductor patterned in a helical shape on a second rear surface of the dielectric substrate; A metal conductor for power supply formed on one side of the front surface of the dielectric substrate to short-circuit and feed the front metal conductor; A grounding metal conductor formed on the other front side of the dielectric substrate; Via holes penetrating through the second front metal conductor and the second back metal conductor and the side surfaces thereof are coated with metal. Ultra broadband antenna comprising a. The method of claim 10, And the via hole electrically shorts the second front metal conductor and the second back metal conductor to increase the inductive component of the antenna. The method of claim 10, And wherein the first backside metal conductor is not electrically shorted with the first front side metal conductor and an electrical bond is formed to increase the capacitive component of the input impedance. delete delete

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