KR100538185B1 - Multi-band built-in antenna and wireless communication apparatus - Google Patents

Abstract

The present invention relates to a built-in antenna and a wireless communication device having the same, wherein the antenna according to the present invention has a first and a second main surface and at least one connection surface connecting the main surfaces. A radiator electrode formed of a base body formed of a material between 1 and 200 and a conductive electrode formed of a pattern on at least a part of the first main surface, and a pattern electrically connected to the radiator electrode; A first main surface on a feeding electrode and a radiator electrode connected to each other, the ground electrode and the radiator electrode formed on the second main surface or the connection surface and electrically insulated from the ground electrode and formed on the second main surface in an independent pattern. And a slot formed in a "ㅓ" shape in the longitudinal direction thereof.

Description

MULTI-BAND BUILT-IN ANTENNA AND WIRELESS COMMUNICATION APPARATUS}

The present invention relates to a built-in antenna and a wireless communication device having the same, and more particularly, to a built-in antenna having a 'ㅓ' shaped slot in the radiator electrode portion and a wireless communication device having the same.

In cellular cellular communication services, Cellular CDMA (Code Division Multiple Access), GSM (Global System for Mobile Telecommunication), PCS (Personal Communication System), 3G mobile communication (IMT-2000), etc. There are various types. Due to the variety of mobile communication services, a multi-band antenna is required.

That is, multi-band antennas are used as multi-mode terminals that can use different mobile communication services simultaneously provided in the same area such as cellular, PCS, PCS, and IMT-2000 as one terminal. The signal transmitted on the downlink by the base station on the traffic and control channels is received by a mobile or portable terminal, each having at least one antenna. Portable terminals have employed a number of different types of antennas for receiving and transmitting signals on the air interface. For example, monopole antennas mounted perpendicular to the conductive surface have been found to provide good radiation characteristics, desirable drive point impedance, and relatively simple configurations. Monopole antennas can be created in a variety of physical forms. For example, rod antennas and whip antennas have often been installed and used in portable terminals. In high frequency applications where antenna length is minimized, another option is a helical antenna.

This demand has led to the need for portable terminals capable of operating in a wide range of different frequency bands (eg, bands located in the 900 MHz region and bands located in the 1800 MHz region). Currently, the dual-mode type that is widely commercialized is typical of the European GSM 900 and DCS 1800 terminals and the US Cellular (800 MHz) and US PCS (1900 MHz) terminals. In such dual and multi-mode portable terminals, an antenna providing adequate gain and bandwidth in both frequency bands should be provided.

Currently, antennas for wireless communication devices such as mobile phones are mounted directly to the body of the phone. However, as the size and weight of portable terminals decrease, the above-described antennas increasingly lose their advantage due to their size. Moreover, as the functionality of these future compact portable terminals increases, there is a need for an internal antenna that can resonate in multiple frequency bands.

SUMMARY OF THE INVENTION The present invention has been made to meet the above necessity, and has a small size with one built-in antenna and is capable of surface mount technology (SMT), and uses an F-type built-in antenna for receiving multiple frequencies and a wireless communication device using the same For the purpose of providing it.

In order to achieve the above object, the multi-band internal antenna according to the present invention is an F-type antenna in which an antenna pattern is formed using an electrode on a dielectric block, and includes a first main surface, a second main surface, and a first main surface. A radiator electrode having at least one connection surface connected between the second main surfaces, the dielectric block having a dielectric constant of 1 to 200, and a radiator electrode formed of a conductive electrode patterned on at least part of the first main surface; It is formed in a pattern electrically connected to the radiator electrode, is connected to the external ground (ground), is electrically insulated from the ground electrode, the radiator electrode and the ground electrode formed on the second main surface and the connection surface at least in an independent pattern A feeding electrode formed in a part on the second main surface, and a "ㅓ" shape formed in a "ㅓ" shape in the longitudinal direction of the first main surface on the radiator electrode; It is characterized in that it is provided with a lot. Preferably, the "자" shaped slot is formed so that the acute angle between the angle between the "-" shaped slot and the "|" shaped slot is 20 degrees to 90 degrees, The "-shaped slot" further comprises at least one extension slot extending from both ends of the "|" shaped slot. The extension slot is to be formed in parallel with the "-" shaped slot constituting the "ㅓ" shaped slot, the multi-band internal antenna further has a polygonal pattern formed at the end of the "ㅓ" shaped slot and the extension slot. In addition, each of the slots forming the " 자 " shaped slots can be formed to have different widths. The multi-band internal antenna is formed on a surface on which the radiator electrode and the feeding electrode are not formed in the dielectric block, and further includes a polygonal coupling pattern for controlling a minute electromagnetic change. On the other hand, the radiator electrode is formed to extend from at least a portion of the first main surface to the connection surface, wherein the "ㅓ" shaped slot is formed to extend from the first main surface to the connection surface. In addition, the boundary surface of the conductive electrode is preferably made to form a straight line.

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In addition, in order to achieve the above another object, in the wireless communication device having a multi-band internal antenna according to the present invention, the multi-band internal antenna which is an F-type antenna having an antenna pattern formed by using an electrode on a dielectric block is a transmitter And a multi band internal antenna coupled to at least one of the receivers, wherein the multi band internal antenna connects between a first main surface, a second main surface, and a first main surface and a second main surface. A dielectric block having at least one connection surface and having a dielectric constant of 1 to 200, a radiator electrode formed of a conductive electrode patterned on at least a portion of the first main surface, and electrically connected to the radiator electrode Is formed in a pattern, connected to the external ground (ground), the ground electrode formed on the second main surface and the connection surface, radiation A feeding electrode formed at least in part on a second main surface in an independent pattern electrically insulated from the sieve electrode and the ground electrode, and a "ㅓ" shaped slot formed in a "ㅓ" shape in the longitudinal direction of the first main surface on the radiator electrode; It characterized by having a.

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The above objects and features of the present invention will become more apparent from the following description of the preferred embodiments with reference to the accompanying drawings.

1 illustrates a perspective view of an antenna according to an embodiment of the present invention. The antenna 100 is an antenna pattern formed by using an electrode on the dielectric block 50 having a dielectric constant of 1 to 200, the antenna type is an F-type antenna, and EM (ElectroMagnetic) feeding through electromagnetic coupling (electromagnetic coupling) Antenna using the scheme. The dielectric block 50 is formed of a dielectric material such as ceramic, resin, or the like, and the electrode may be made of a metal material such as silver (Ag), copper (Cu), an alloy of silver and palladium (Ag / Pd), and the like. have. The antenna 100 includes a dielectric block 50 and a radiator electrode 30 including three-dimensionally formed electrodes on at least one surface of the dielectric block, and a ground electrode 10 electrically connected to the radiator electrode 30. And a feeding electrode 20 formed in an independent pattern shape while maintaining insulation from the radiator electrode 30 and the ground electrode 10 described above. The electrical insulation while describing the shape of the electrode in the above means that the electrodes are not connected to each other when viewed visually as shown in FIG. 1.

The ground electrode 10 is an electrode connected to the ground 11, and the feeding electrode 20 is an electrode for connecting the sensed radio wave with the signal source 21. The antenna 100 according to the present invention forms a 'ㅓ' shaped slot 60 in the longitudinal direction on the radiator electrode surface in order to obtain the characteristics of the multi-band. The slot 60 is a groove having a predetermined width, and the dielectric is exposed in the slot 60 region formed on the radiator electrode surface.

The characteristic of the multi-band is to operate at a first frequency along the A route around the entire outline of the "ㅓ" slot formed on the radiator electrode 30 of the antenna as shown in FIG. Along some slots (eg "B1 root" or "B2 root") appearing to operate in the second frequency band.

At this time, the "ㅓ" shape formed on the radiator electrode 30 does not necessarily have to be a right angle, as shown in FIG. 3, and may have an acute angle between 20 degrees and 90 degrees. Preferably it has an angle of 90 degrees. In addition, the two straight lines “-” and “ㅣ” that form the “ㅓ” need not be perfect straight lines, and multiband characteristics can be obtained even if they are composed of somewhat twisted lines, and the “ㅓ” shaped slots have more than two sides of the dielectric block. It may be formed over.

Also, as shown in FIG. 3, the "-"-shaped straight line among the straight lines forming the "-" shaped slot is generally parallel to the radiator electrode surface 30, but may not be parallel to the radiator electrode surface 30. It was.

Frequency is formed by forming slots 61 and 62 extending as shown in Figs. 4 (a) and 4 (b) at both ends of “ㅣ” among the “ㅓ” characters formed on the radiator electrode surface 30. And antenna characteristics could be adjusted. At this time, it is preferable that the slots 61 and 62 extending form a right angle with “ㅣ” that constitutes a “ㅓ” character, but do not have to form a right angle. In addition, the extending slots 61 and 62 may not be formed to be parallel to the outline of the radiator electrode 30 formed on the same dielectric surface.

The extended slots 61 and 62 may be formed on both sides or only one of the extended slots, and may be formed of two or more straight lines formed in a straight line or a curved line.

As shown in FIG. 5, a "63" shaped slot 60 on the radiator electrode 30 and slots 61 and 62 extending therefrom have a pattern 63 such as a polygon or a circle formed at each end of the slot. It was okay to stick. In addition, the "-" and " " type slots and the extended slots may be partially formed in different widths.

As another method of finely adjusting the antenna characteristics, as shown in FIG. 6, a serrated or polygonal shape is formed on the outer surface of the radiator electrode 30, or the radiator electrode 30 and the feeding electrode 20 are formed. A circular or polygonal coupling pattern 70 is placed on an uninterrupted dielectric block. The shape of the coupling pattern 70 may have various shapes in addition to the illustrated circle or polygon. This is because the electromagnetic field characteristic induced by the modified radiator electrode 30 pattern or the coupling pattern is changed. When it is necessary to adjust the characteristics relatively much, the distance between the ground electrode 10 and the feeding electrode 20 is adjusted.

In the case of the ground electrode 10, it is not necessary to form the surface on which the feeding electrode 20 is formed, and may be provided on the desired surface in order to facilitate the connection of the signal line and the ground line.

In the case of the feeding electrode 20, the bars illustrated in FIGS. 1 and 4 to 6 are shown to be formed only on a part of the bottom surface (second main surface), but the two connecting parts including the bottom surface or the bottom surface are connected. It may be formed extending to more than one side. In addition, the feeding electrode 20 is formed in parallel with the radiator electrode 30 and has a rectangular shape shorter than the length of the dielectric block 50, but may be formed in a polygonal shape.

7 to 10 are graphs showing antenna characteristics according to the present invention, in which an antenna fabricated for use in measurement is formed of a slot and an electrode as shown in FIG. 4 using silver (Ag) on a ceramic dielectric body having a thickness of 3 mm. It is formed. Hereinafter, the characteristics of the antenna according to the present invention will be described with reference to FIGS. 7 to 10.

7 to 9 show radiation pattern azimuth (azimuth angle) of the XY plane (PLANE), radiation pattern elevation 1 of the XZ plane (PLANE), and radiation pattern elevation 2 of the YZ plane (PLANE), respectively. Illustrated. In the graphs of Figs. 7 to 9, the spherical axis shows the rotation angle (0 degrees to 360 degrees) and the graph shows the gain value. As shown in FIG. 7 to FIG. 9, the antenna according to the present invention has good omnidirectional frequency reception in all directions and has excellent gain characteristics.

10 is a graph showing the frequency characteristics of the antenna proposed in the present invention. The horizontal axis represents frequency and the vertical axis represents standing wave ratio (SWR). The above graph shows the frequency characteristics from 500 MHz to 2,500 MHz. Looking at the point of standing wave ratio 3, the built-in antenna according to the present invention shows the frequency characteristics of the first region having a width of 100 MHz in the 900 MHz region. It can be seen that it has a frequency characteristic of the second region having a width of 400MHz in the 1,800 MHz region. As illustrated in the graph of FIG. 10, two or more frequencies may operate in the frequency band region because the frequency band of the second region in which the antenna according to the present invention operates is relatively wide (400 MHz). Therefore, it can be seen that the antenna according to the present invention can operate as an antenna of triple band or more.

11 shows the case of the mobile phone 40 among wireless communication devices employing the built-in antenna according to the present invention. The mobile phone of Fig. 8 is mounted in the case 42 of the mother board 41 on which the antenna device 100 and other circuit elements (not shown) of the above-described embodiment are mounted, and the circuit pattern is printed. The circuit board includes a transmitter / receiver circuit.

In this manner, the mobile phone 40 can cover more multiple bands by mounting the built-in antenna device 100 according to the present invention. For example, the mobile phone 40 can be used as a multiple band covering 1.8 GHz or 900 MHz used in the GSM method. Can be.

The antenna according to the present invention has two or more frequency characteristics only by the formation of a "ㅓ" slot on the radiator electrode, and a thin and small internal multiband antenna can be realized.

In addition, as an F-type antenna having a feeding terminal and a ground terminal, SMT (Surface Mount Technology) is possible.

In addition, since the frequency band that can be received is a wide band, it can be used not only in three or more bands, but also has an omnidirectional antenna which is not affected by the direction and a wireless communication device using the same.

While the preferred embodiments of the present invention have been described using specific terms, such descriptions are for illustrative purposes only, and it is understood that various changes and modifications may be made without departing from the spirit and scope of the following claims. Should be done.

1 is a perspective view of an antenna according to an embodiment of the present invention.

Figure 2 is a slot shape for explaining the frequency characteristics by the slot formed in the antenna according to the present invention.

3 is a view for explaining the angle constituting the slot formed in the antenna according to the present invention.

4 is a perspective view of an antenna of another embodiment according to the present invention.

5 is a perspective view of an antenna of another embodiment according to the present invention.

6 is a perspective view of an antenna to which a pattern for finely adjusting electromagnetic waves is applied to an antenna according to an embodiment of the present invention.

7 to 9 are graphs showing the radiation characteristics including the directionality of the antenna proposed in the present invention.

10 is a graph showing the radiation characteristics according to the frequency of the antenna proposed in the present invention.

11 is a perspective view of a wireless communication device employing an antenna according to the present invention.

Claims (11)

An F-type antenna in which an antenna pattern is formed using an electrode on a dielectric block, The dielectric block having a first main surface, a second main surface, and at least one connection surface connecting the first main surface and the second main surface and having a dielectric constant of 1 to 200; A radiator electrode formed of a conductive electrode patterned on at least a portion of the first main surface; A ground electrode formed in a pattern electrically connected to the radiator electrode, connected to an external ground, and formed on the second main surface and the connection surface; A feeding electrode which is electrically insulated from the radiator electrode and the ground electrode and formed on at least part of the second main surface in an independent pattern; And And a "ㅓ" shaped slot formed in a "ㅓ" shape in the longitudinal direction of the first main surface on the radiator electrode. The method of claim 1, And a 20-90 degree angle between the "-" shaped slot and the acute angle of the "-" shaped slot and the "-" shaped slot. The method of claim 1, The "ㅓ" shaped slot, And at least one extension slot extending from both ends of the " " shape slot. The method of claim 1, And a plurality of slots forming the “하는” shaped slots different in width from each other. The method of claim 3, wherein And the extension slot is formed in parallel with the “-” shaped slot forming the “ㅓ” shaped slot. The method of claim 1, Multiband internal antenna, And a polygonal coupling pattern formed on a surface of the dielectric block in which the radiator electrode and the feeding electrode are not formed, and configured to control minute electromagnetic changes. The method according to claim 1 or 3, The radiator electrode, And a multi-band internal antenna extending from at least a portion of the first main surface to the connection surface. The method of claim 7, wherein And the "ㅓ" shaped slot extends from the first main surface to the connecting surface. The method of claim 1, Multi-band internal antenna, characterized in that the boundary surface of the conductive electrode to form a straight line. The method of claim 3, wherein The multi-band internal antenna, And a polygonal pattern formed at an end portion of the " 슬롯 " shaped slot and the extension slot. A wireless communication device having a multi-band internal antenna, which is an F-type antenna having an antenna pattern formed on the dielectric block by using an electrode, is coupled to at least one of a transmitter and a receiver. The multi-band internal antenna, The dielectric block having a first main surface, a second main surface, and at least one connection surface connecting the first main surface and the second main surface and having a dielectric constant of 1 to 200; A radiator electrode formed of a conductive electrode patterned on at least a portion of the first main surface; A ground electrode formed in a pattern electrically connected to the radiator electrode, connected to an external ground, and formed on the second main surface and the connection surface; A feeding electrode which is electrically insulated from the radiator electrode and the ground electrode and formed on at least part of the second main surface in an independent pattern; And And a "ㅓ" shaped slot formed in a "ㅓ" shape in the longitudinal direction of the first main surface on the radiator electrode.