KR20090079048A - Ultra wide band antenna using double side radiator - Google Patents

Abstract

An ultra-wide band antenna using a both sides radiator is provided to recover restrictions of height of a built-in antenna and to reduce largely a size thereof by securing stably an ultra-wide band characteristic. An ultra-wide band antenna using a both sides radiator includes a substrate, a grounding part(102), a first radiator(108), a feeding unit(106), a via hole, and a second radiation(110). The grounding part is formed on the substrate. The first radiator is formed on the substrate. The feeding unit is electrically coupled with the first radiator in order to feed a RF signal. The via hole is formed at the first radiator. The second radiator is formed at a lower part of the substrate. The second radiator is used for receiving the RF signal through the via hole.

Description

Ultra Wide Band Antenna Using Double Side Radiator

The present invention relates to antennas and, more particularly, to embedded antennas used in ultra-wideband systems.

The UWB system is a system that occupies over 25% of the bandwidth occupied by the Federal Communications Comission (FCC), or a wireless transmission technology system occupying over 500 MHz. (3.1 GHz to 10.6 GHz), the commercial use of the technology has been developed for the US military wireless technology has been open to general communications.

UWB technology copies a pulse-modulated signal into space without using a carrier wave. UWB can be applied to distance measurement and radar technology in addition to the existing wireless communication area.

The UWB system converts digital code information into an impulse signal with a very short pulse width of less than nanoseconds and transmits it wirelessly, thereby enabling high-speed communication of 100 Mbps or more such as optical communication. It is expected to be used as a technology capable of overcoming the limitations of the existing wireless communication because it can be used tens of times longer than the communication method and can also reduce the size of the transceiver.

Since the signals of UWB systems can use a wide frequency band, the power density value in the frequency domain can be set to a very small value, so that even if it is superimposed on a frequency where other communication signals exist, it can give little interference. have.

Initially, the UWB communication signal has obtained a wide frequency band by using a very short signal pulse, but now various modified UWB methods such as CDMA and OFDM have been proposed.

UWB systems can transmit and receive data using frequencies already used by other systems, enable high-speed communication at very low power, and have excellent barrier transmission characteristics. Due to these advantages, the UWB system is expected to be widely applied to the next generation personal area wireless communication fields such as wireless home networks.

Since UWB systems use a fairly wide frequency band of 3.1 to 10.6 GHz, UWB antennas need to have corresponding broadband characteristics. Such an antenna occupies a larger volume than a general narrowband antenna. This is a significant obstacle to practical application implementation in that the antenna is applied to a handheld wireless device with a lack of area.

Currently, horn antennas, biconical antennas, and the like are widely known as UWB antennas, but these antennas have problems that are not appropriate to be applied to small portable wireless devices having insufficient antenna area.

Universal Serial Bus (USB), meanwhile, continues to evolve into new technologies, combined with wireless technology, to be applied to electronic equipment in a variety of fields, including PCs, peripherals, consumer electronics, and mobile communications devices in the Wireless Personal Area Network. It is a prospect.

The USB Implements Forum (USB-IF) began developing the specification in September 2004 and standardized the Wireless USB 1.0 specification in May 2005. The basic transmission technology of Wireless USB is being standardized based on the UWB wireless platform.

As a suitable antenna for UWB communication, a planar monopole antenna is widely used because it is easy to direct and easy to manufacture. The planar monopole antenna is a structure in which the feed line and the radiator exist in the same plane above the dielectric and the finite ground plane exists below the feed line.

Planar monopole antennas have dual- or ultra-wideband characteristics, depending on the shape of the radiator. A radiator consisting of two T-shaped strips, a radiator consisting of one monopole and a parasitic patch, and two monopoles of different heights are dual band antennas. In the form of a circle, ellipse or taped particular type of emitter, it has UWP characteristics. In addition, depending on the power feeding method, there may be a case where a power is supplied by a microstrip line or a power is supplied by CPW.

However, the planar monopole antenna has a problem in that the operating frequency and bandwidth of the antenna vary greatly according to the size of the ground plane, and it is difficult to apply the CPW structure antenna to the substrate of the actual electronic device using the ground plane of the radiator. . Therefore, in order to use the built-in antenna of the electronic device, there is a demand for a built-in antenna having a broadband characteristic that the operating frequency and bandwidth does not change by a finite ground plane.

In the present invention, in order to solve the problems of the prior art as described above, an ultra-wideband antenna using a double-sided radiator that can secure the broadband characteristics more stably.

Another object of the present invention is to propose an ultra-wideband antenna using a double-sided radiator capable of miniaturizing and overcoming the height constraint of the built-in antenna.

In order to achieve the above object, according to an aspect of the present invention, a substrate; A ground part formed on the substrate; A first radiator formed on the substrate; A feeding unit electrically coupled to the first radiator to feed an RF signal; A via hole formed on the first radiator; And a second radiator formed below the substrate and including a second radiator configured to receive an RF signal through the via hole.

According to an embodiment of the present invention, the antenna further includes an extended ground portion extending from the ground portion and spaced apart from the first radiator by a predetermined distance and formed on the substrate.

According to another embodiment of the present invention, the antenna further includes an extension ground portion formed on the substrate spaced apart from the ground portion and the first radiator by a predetermined distance.

Preferably, the first radiator and the second radiator are formed symmetrically with respect to the feed part.

Preferably, slits are formed in some regions of the first radiator and the second radiator, and slits of the first radiator and the second radiator are symmetrically formed.

Preferably, the first radiator and the second radiator have a rectangular shape, and a notch formed by cutting a portion of the first radiator and the second radiator, respectively, is formed, and the notch formed on the first radiator and the second radiator is symmetrical.

According to another aspect of the invention, the substrate; A ground part formed on the substrate; A first radiator formed on the substrate; A feeding unit electrically coupled to the first radiator to feed an RF signal; An ultra-wideband antenna using a double-sided radiator formed under the substrate and including a second radiator symmetrically formed around the first radiator and the power supply unit is provided.

According to the present invention, through the double-sided radiator structure, it is possible to more stably secure the broadband characteristics, and overcome the limitation of the height of the built-in antenna, there is an advantage that can be miniaturized.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the ultra-wideband antenna using a double-sided radiator according to the present invention.

1 is a perspective view showing the structure of an ultra-wideband antenna using a double-sided radiator according to an embodiment of the present invention.

Referring to FIG. 1, an ultra-wideband antenna using a double-sided radiator according to an exemplary embodiment of the present invention may include a substrate 100, a grounding unit 102, an extended grounding unit 104, a feeding unit 106, and a first radiator ( 108 and a second radiator 110.

In FIG. 1, the substrate 100 is made of a dielectric material and functions as an antenna body to which other structural elements are coupled.

Various dielectric materials may be applied to the substrate 100, and it is preferable to use the FR4 substrate which is used for general purposes and to reduce the production cost. The shape and size of the substrate may be variously set according to the environment in which the antenna is used.

The ground portion 102 provides a ground voltage and is coupled to the top of the substrate 100. The grounding part 102 may be implemented using a general metal body, and may be formed in a rectangular shape having a predetermined length and width and formed in a portion of an upper portion of the substrate as shown in FIG. 1, but is not limited thereto. no.

According to an embodiment of the present invention, the vertical length of the ground portion 102 may be set to 50mm horizontal length of 30mm.

The expansion ground portion 104 is formed to extend from the ground portion 102 of the rectangular shape. The extended grounding unit 104 is preferably formed integrally with the grounding unit 102, and the extended grounding unit 104 is formed to extend in the resonance frequency matching in the low frequency band.

The power feeding unit 106 performs power feeding of the RF signal and is coupled to the upper portion of the substrate 100. As shown in FIG. 1, the feeder 104 may be implemented by a metal plate having a rectangular shape.

According to one embodiment of the present invention, the power supply unit 106 of the upper portion of the substrate may be electrically connected to the inner conductor of the coaxial cable of the RF transmission line is electrically coupled. On the other hand, the outer conductor of the coaxial cable may be electrically coupled with the ground portion 102.

The first radiator 108 and the second radiator 110 are components for the emission of the RF signal. The bandwidth of the antenna is determined by the length and width of the radiator, and the first radiator 108 and the second radiator 110 of the present invention for applying to the ultra wide band may have a rectangular shape. However, it will be apparent to those skilled in the art that the shape of the radiator is not limited to the rectangle and that various types of radiators may be used to satisfy the ultra wide band.

According to a preferred embodiment of the present invention, the first radiator 108 is formed on the upper portion of the substrate, and the second radiator 110 is formed on the lower portion of the substrate. Conventional UWB antennas are generally provided with a plurality of radiators on the same plane of the upper part of the substrate or spaced apart from each other by a predetermined distance up and down, but the present invention proposes a structure in which radiators are provided on both sides of the substrate.

The structure having the radiator on both sides instead of the same plane has an advantage in maintaining a wide bandwidth, and in terms of structure, there is an advantage of removing the constraint of the height of the built-in antenna.

FIG. 2 is a diagram illustrating S11 parameters when the radiator is provided only on the upper surface of the substrate, when the radiator is provided only on the lower surface of the substrate, and when two radiators are provided on both sides of the substrate.

2, when the radiator is provided only on the upper surface of the substrate, the impedance bandwidth is satisfied in the 6 to 12 GHz band. When the radiator is provided only on the upper surface of the substrate, the impedance bandwidth of the 3.5 to 9 GHz band is satisfied, but the upper and lower surfaces of the substrate are satisfied. When all the radiators are provided, it can be seen that impedance matching is uniformly performed in all regions of the UWB band.

In order to look at the structure of the first radiator and the second radiator in more detail with reference to Figs.

3 is a top plan view of an ultra-wideband antenna using a double-sided radiator according to an embodiment of the present invention, and FIG. 4 is a bottom plan view of the ultra-wideband antenna using a double-sided radiator according to an embodiment of the present invention. 5 is a diagram illustrating a first radiator and a second radiator of an ultra-wide band antenna using a double-sided radiator according to an embodiment of the present invention on the same plane.

3 to 5, the first radiator and the second radiator are preferably formed in a symmetrical structure with respect to the power supply unit 106.

As shown in FIG. 5, the first radiator 108 is formed on the left side of the power feeding unit 106, and the second radiator 110 is formed under the substrate on the right side. In FIG. 5, region A is a region where the first radiator and the second radiator overlap vertically.

When the first radiator 106 and the second radiator 108 are symmetrically formed, there is an advantage in that omnidirectional characteristics can be obtained in the radiation pattern.

The via hole 112 is formed in an area A where the first radiator 108 and the second radiator 110 overlap vertically. The via hole is a component for feeding a signal to the second radiator 110.

The signal is fed directly to the first radiator 108 through the feed part 106, and the signal is fed to the second radiator 110 through the via hole 112.

Although one via hole is illustrated in FIGS. 1 to 5, it will be apparent to those skilled in the art that a plurality of via holes may be provided.

The via hole 110 may not only be used to feed the signal but may also affect radiation characteristics. By adjusting the position, size, and number of via holes 110, tuning of desired radiation characteristics is possible.

The extended ground portion 104 shown in Figs. 1 to 5 is formed to satisfy the radiation characteristics of the ultra wide frequency band, particularly in the low frequency band of 3.1 GHz. The expanded grounding part 104 may be basically rectangular in shape, is formed to protrude on the same plane as the grounding part, and may be formed integrally with the grounding part as described above. However, the present invention is not limited to the extension grounding part 104 in which the grounding part 100 is integrally formed, and the expansion grounding part 104 may be formed independently from the grounding part 100 by a predetermined distance. There will be.

The expansion ground part 104 is formed to be spaced apart from the first radiator 108 by a predetermined distance, and the width, the length of the expansion ground part, and the distance from the first radiator 108 may serve as a tuning element for adjusting the radiation characteristic.

The radiator of the antenna according to the embodiment of the present invention can be modified in various forms. Hereinafter, a deformable embodiment of the antenna of the present invention will be described.

FIG. 6 is a diagram illustrating shapes of a first radiator and a second radiator according to another embodiment of the present invention. FIG.

For convenience of description, the first radiator and the second radiator are illustrated on the same plane in FIG. 6, and the second radiator is actually formed on the lower portion of the substrate in the same structure as in FIG. 1.

Referring to FIG. 6, slits 600 may be formed in some regions of the first radiator and the second radiator according to the exemplary embodiment of the present invention. Since the first radiator and the second radiator are preferably symmetrical, the slit shape is also preferably formed symmetrically, as shown in FIG. 6.

 An antenna that can accommodate a wide band of frequencies, such as an ultra wide band antenna, may have a band stop characteristic in a specific band. The slit 600 may be formed to compensate for such band blocking characteristics.

According to one embodiment of the present invention, the length of the slits formed in the first and second radiators may be 1 mm and the width may be 1.5 mm. By such a slit 600, it is possible to compensate for the band blocking characteristic that occurs particularly at 5 ~ 6GHz.

7 is a diagram illustrating the shape of a first radiator and a second radiator according to another embodiment of the present invention.

Referring to FIG. 7, notches 700 and 702 may be formed in the first radiator and the second radiator. FIG. 7 also shows the first radiator and the second radiator on the same plane for convenience of description, and the second radiator is provided at the bottom of the substrate.

The notches 700 and 702 may be formed for easy impedance matching in the high frequency band, and according to an embodiment of the present invention, the width of the notches 700 and 702 may be 2 mm long and 1 mm long.

8 is a diagram illustrating the shape of a first radiator and a second radiator according to another embodiment of the present invention.

FIG. 8 illustrates a case in which both the slits of FIG. 6 and the notches of FIG. 7 are provided. Preferably, notches and slits are formed for band blocking in a specific band and impedance matching in a high frequency band.

FIG. 9 is a diagram illustrating S11 parameters of an ultra-wide band antenna using a double-sided radiator according to an embodiment of the present invention.

Referring to FIG. 9, it can be seen that an antenna according to an embodiment of the present invention has a return loss of 10 dB or less in a frequency band of 3 GHz to 10 GHz of an ultra-wideband system.

10 is a diagram illustrating a radiation pattern of an ultra-wide band antenna using a double-sided radiator according to an embodiment of the present invention.

As shown in FIG. 10, the antenna according to the embodiment of the present invention has an omnidirectional radiation pattern, and as described above, omnidirectionality of the radiation pattern may be improved when the first and second radiators are symmetrical. have.

The above-described embodiments of the present invention are disclosed for the purpose of illustration, and those skilled in the art can make various modifications, changes, and additions within the spirit and scope of the present invention. Additions should be considered to be within the scope of the following claims.

1 is a perspective view showing the structure of an ultra-wideband antenna using a double-sided radiator according to an embodiment of the present invention.

FIG. 2 illustrates S11 parameters when the radiator is provided only on the upper surface of the substrate, when the radiator is provided only on the lower surface of the substrate, and when two radiators are provided on both sides of the substrate. FIG.

3 is a top plan view of an ultra-wideband antenna using a double-sided radiator according to an embodiment of the present invention.

4 is a bottom plan view of the ultra-wideband antenna using a double-sided radiator according to an embodiment of the present invention.

5 is a diagram illustrating a first radiator and a second radiator of an ultra-wideband antenna using a double-sided radiator according to an embodiment of the present invention on the same plane.

6 is a view showing the shape of the first radiator and the second radiator according to another embodiment of the present invention.

FIG. 7 is a diagram illustrating the shape of a first radiator and a second radiator according to another embodiment of the present invention; FIG.

8 is a view showing the shape of the first radiator and the second radiator according to another embodiment of the present invention.

FIG. 9 illustrates S11 parameters of an ultra-wideband antenna using a double-sided radiator according to an embodiment of the present invention. FIG.

10 is a diagram showing a radiation pattern of the ultra-wideband antenna using the double-sided radiator according to an embodiment of the present invention.

Claims (14)

Board; A ground part formed on the substrate; A first radiator formed on the substrate; A feeding unit electrically coupled to the first radiator to feed an RF signal; A via hole formed on the first radiator; And An ultra-wideband antenna using a double-sided radiator formed under the substrate and including a second radiator configured to receive an RF signal through the via hole The method of claim 1, And an extended ground part extending from the ground part and spaced apart from the first radiator by a predetermined distance and formed on the substrate. The method of claim 1, And an extended ground part formed on the substrate to be spaced apart from the ground part and the first radiator by a predetermined distance. The method of claim 1, And the first radiator and the second radiator are symmetrically formed with respect to the feeder. The method of claim 1, An ultra-wideband antenna using double-sided radiators, characterized in that slits are formed in some regions of the first radiator and the second radiator, respectively. The method of claim 5, Ultra-wide band antenna using a double-sided radiator, characterized in that the slits formed in the first radiator and the second radiator are formed symmetrically. The method of claim 1, And the first radiator and the second radiator have a rectangular shape, and a notch having a portion cut therein is formed, respectively. The method of claim 7, wherein The notch formed in the first radiator and the second radiator is an ultra-wideband antenna using a double-sided radiator, characterized in that symmetrical. Board; A ground part formed on the substrate; A first radiator formed on the substrate; A feeding unit electrically coupled to the first radiator to feed an RF signal; An ultra-wideband antenna using a double-sided radiator which is formed on the lower portion of the substrate and comprises a second radiator symmetrically formed around the first radiator and the feeder. The method of claim 9, And a via hole electrically connected to the second radiator formed on the first radiator, wherein the second radiator receives a signal through the via hole. The method of claim 10, And an extended ground part extending from the ground part and spaced apart from the first radiator by a predetermined distance and formed on the substrate. The method of claim 10, And an extended ground part formed on the substrate to be spaced apart from the ground part and the first radiator by a predetermined distance. The method of claim 10, An ultra-wideband antenna using double-sided radiators, characterized in that slits are formed in some regions of the first radiator and the second radiator, respectively. The method of claim 10, And the first radiator and the second radiator have a rectangular shape and a notch having a portion cut therein is formed, respectively.

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