KR101373332B1 - Antenna assembly and portable terminal having the same - Google Patents

Abstract

The present invention relates to a built-in antenna assembly and a portable terminal having the same, which is embedded in the inside of the terminal, and has a radiator capable of operating in various communication bands in a space-constrained portable terminal, while making them intensive arrangement and low band The present invention provides a built-in antenna assembly and a portable terminal having the same, which can secure a radiation gain and secure a wide bandwidth at a high frequency.

Description

ANTENNA ASSEMBLY AND PORTABLE TERMINAL HAVING THE SAME}

The present invention relates to a built-in antenna assembly embedded in the terminal and a portable terminal having the same.

A portable terminal is a portable device that is portable and has one or more functions such as voice and video calling, information input and output, and data storage.

As the functions are diversified, the portable terminal also has complicated functions such as photographing and photographing of a moving picture, reproduction of a music or video file, reception of a game, and broadcasting. These functions can be implemented at once to implement a comprehensive multimedia player.

In order to implement complex functions, various new attempts have been made in terms of hardware or software for mobile terminals. In addition, a user interface environment is provided for a user to search for or select a function easily and conveniently.

One aspect of the development of information and communication technology includes a dramatic increase in the amount of data that can be transmitted and received wirelessly and the transmission speed. To do this, the antenna needs to receive a large amount of wireless data in a clean quality while moving.

The number of antennas required by various wireless services of the mobile terminal, for example, cellular mobile communication, reception of digital broadcasting, and short-range communication including Bluetooth may increase. They differ in band and require multi-resonant antennas.

However, it is difficult to configure all the antenna patterns satisfying each service in one plane due to the spatial constraints of the mobile terminal.

It is an object of the present invention to provide a built-in antenna assembly having radiators operable in various communication bands in space-constrained portable terminals.

One aspect of the present invention is to provide an antenna assembly that saves volume by appropriately arranging various radiators through a structure of a carrier for supporting the antenna.

Another aspect of the present invention allows the radiator for the high band and the radiator for the low band to express excellent radio characteristics through efficient arrangement and shape.

In order to realize the above object, the present invention provides a dielectric carrier having a first mounting surface formed at a first height relative to the ground surface and a second mounting surface formed at a second height lower than the first height, and the first mounting surface. An antenna assembly including a first antenna radiator mounted on a surface and a second antenna radiator mounted on a second mounting surface and operating in a resonant frequency band higher than that of the first antenna radiator is proposed. Since the first antenna emitter is disposed at a position higher than the second antenna emitter with respect to the ground plane, it is advantageous to secure the radiation gain in the low band, and the second antenna emitter secures a wide bandwidth at high frequency instead of reducing the dependency on the ground plane. To do so. Such an antenna assembly may be called hybrid.

The first antenna radiator and the second antenna radiator may be formed in a stacked structure on a carrier, and antenna radiators operating in different bands may be concentrated in a small space, thereby conserving space.

The carrier may comprise a horizontal support and a vertical support. The horizontal support portion is configured such that its outer surface forms a first mounting surface and its inner surface forms a second mounting surface, and the vertical support portion can secure stable support or fixing force by supporting the horizontal support portion at a constant height with respect to the ground surface. .

The first antenna radiator may be designed to operate as a flat plate inverted antenna (PIFA) or a kind of antenna by including a signal feeding portion for feeding and a ground feeding portion shorted to the ground plane. In this case, the signal feed portion and the ground feed portion are formed in the form of elastic springs to ensure stable contactability and improve assembly.

The second antenna radiator has at least one connection pad for feeding and an antenna substrate fixed in parallel to the second mounting surface, and a conductive first pattern portion fixed along the vertical surface perpendicular to the antenna substrate and fixed to the antenna substrate. Include.

A chip structure fixed to the antenna substrate may be provided on the bottom surface of the antenna substrate, and the end of the first pattern portion may be fixed to the chip structure so that the first pattern portion may be spatially adjusted in various shapes or positions.

The surface of the chip structure may further include a conductive third pattern portion that is electromagnetically coupled to the first pattern portion or the second pattern portion, thereby improving radio characteristics of the second antenna radiator. In particular, it is possible to widen the resonance band of the second antenna radiator and to secure more serviceable bands by setting the length and the interval so that the capacitance component is expressed with respect to the first pattern portion.

The ground plane may be formed on the main PC ratio, and the main PC ratio may have an example in which an elastic connection portion for elastic contact with the connection pad formed on the antenna substrate of the second antenna radiator is attached. As a result, the assemblability is improved while stably securing the connection of the second antenna radiator.

The antenna substrate of the second radiator may be provided with a matching unit for matching a signal of the first antenna radiator. The matching unit fixes the element mountable on the antenna substrate by soldering or the like. Therefore, space can be saved than putting the matching part in the main PC ratio.

The antenna assembly is implemented in a form that is embedded in the portable terminal. Therefore, an application example which can fully operate in various bands can be obtained in a limited space of a light and short portable terminal.

According to the antenna assembly and the portable terminal having the same according to the present invention configured as described above, since the first antenna radiator and the second antenna radiator are placed on both mounting surfaces of the carrier, the low band and various wireless services for communication are received. There is an effect of obtaining a suitable antenna placement in the high band.

Since the antenna radiators are arranged in a stacked form on a mounting surface provided by a carrier, there is no need for a separate space for antenna placement or a separate space for shielding, which is advantageous for implementing a small and slim mobile terminal.

Hereinafter, a portable terminal related to the present invention will be described in detail with reference to the drawings.

1 is a perspective view of a portable terminal according to an embodiment of the present invention. The portable terminal 1 includes a terminal body 10, and a case (casing, housing, cover, etc.) forming the exterior of the terminal body 10 is formed by the front case 11 and the rear case 12. . Various electronic components are embedded in the space formed by the front case 11 and the rear case 12. [

At least one intermediate case may be additionally disposed between the front case 11 and the rear case 12. [ The cases may be formed by injection molding a synthetic resin, or may be formed to have a metal material such as stainless steel (STS) or titanium (Ti) or the like.

The front case 11 may include a display unit 15, an audio output unit 16, an image input unit 17, or a first manipulation unit 20.

The display unit 15 includes a liquid crystal display (LCD) module, an organic light emitting diode (OLED) module, and the like that visually express information. The display unit 15 may further include a touch screen to enable input of information by a user's touch.

The sound output unit 16 may be implemented in the form of a receiver or a speaker.

The image input unit 17 may be implemented in the form of a camera module for capturing an image or a video of a user.

At least one of the front case 11 or the rear case 12 may be provided with a second manipulation unit 21, a sound input unit 24, and an external interface 25.

The first and second manipulators 20 and 21 may be collectively referred to as manipulating portions, and may be employed in any manner as long as it is a tactile manner in which the user operates with a tactile feeling. For example, the operation unit may be implemented by a dome switch or a touch screen, a touch pad, or a wheel, a jog type, a joystick, or the like, As shown in FIG.

In functional terms, the first operation unit 20 may be configured to input a command such as a start, end, or scroll, and to input a number, a letter, a symbol, and the like. The second manipulation unit 21 may operate as a hot-key that performs a special function such as activation of the image input unit 17.

The sound input unit 24 may be implemented in the form of, for example, a microphone to receive a user's voice, other sounds, and the like.

The external interface 25 serves as a passage for allowing a portable terminal related to the present invention to exchange data with an external device. For example, the external interface 25 may be a connection terminal for connecting to the earphone by wire or wirelessly, or a port for short-range communication (for example, an infrared port (IrDA port), a Bluetooth port, a wireless LAN port). (wireless LAN port) etc.}. The external interface 25 may be a card socket that accommodates an external card such as a subscriber identification module (SIM) or a user identity module (UIM), a memory card for information storage, and the like.

On the rear case 12 side, a power supply unit 23 for supplying power to the portable terminal is mounted. The power supply unit 23 may be detachably coupled for charging, for example, as a rechargeable battery.

On one side of the terminal body 10, an antenna 28 for reception of a broadcast signal may be arranged in addition to an antenna for a call or the like. The antenna 28 may be installed to be detachable from the terminal body 10.

The portable terminal according to an embodiment of the present invention is not limited to the bar type shown in FIG. 1 but can be applied to various structures such as a slide type, a folder type, and a swing type.

2 is an exploded perspective view of the portable terminal of FIG. 1 to show an antenna assembly related to the present invention.

As shown in FIG. 2, the terminal body may be separated into the front case 11 and the rear case 12, and the antenna assembly 30 is disposed at one side of the main PC 31.

The antenna assembly 30 may be disposed at a corner so as to reduce electromagnetic interference by other components or conductors, and to reduce the influence of the user's hand or head. 2 shows an example in which the antenna assembly 30 is disposed at the corner of the first manipulator 20. Alternatively, the antenna assembly 30 may be disposed in the corner of the sound output unit 16.

3 is an assembled perspective view of the antenna assembly related to the present invention. Referring to FIG. 3, the antenna assembly 30 is disposed on one side of a wiring board on which the ground plane G is formed. The ground plane G is excluded from the periphery of the antenna assembly 30 so as to reduce the degradation of the radiation performance.

The antenna assembly 30 includes a first antenna radiator 40 on an upper surface thereof, and the first antenna radiator 40 is supported by the carrier 32.

4 is an exploded perspective view of the antenna assembly of FIG. 3. As shown in FIG. 4, the antenna assembly 30 includes the first antenna radiator 40, the carrier 32, the second antenna radiator 50, and the main PC ratio 31 in order from the top.

The carrier 32 stably supports the first antenna radiator 40 and the second antenna radiator 50, but does not affect the radiation characteristics of the first antenna radiator 40 and the second antenna radiator 50. It is made of a material such as resin or ceramics.

It is also possible that the dielectric constant epsilon _r of the carrier 32 is set higher than air to increase the resonance bandwidth by increasing the capacitance component between the first antenna radiator 40 and the ground plane G. [

The first antenna radiator 40 may be formed in the form of a conductive metal sheet or a plated or printed metal thin film, and the first antenna radiator 40 may be formed on the upper surface of the carrier 32. One mounting surface 34 is formed. The first mounting surface 34 may be formed in a shape in which the first antenna radiator 40 is stepped by the thickness of the first antenna radiator 40 so as to achieve the same outer surface after the first antenna radiator 40 is seated. The first antenna radiator 40 may not only be in close contact with the first mounting surface 34 but also may be disposed to proceed without contacting the carrier 32 in some sections.

Protrusions 34a are formed on the first mounting surface 34 to fix the first antenna radiator 40. Correspondingly, insertion holes 40a through which protrusions 34a are inserted are formed in the first antenna radiator 40, respectively. When the first antenna radiator 40 is seated on the first mounting surface 34, end portions of the protrusions 34a protruding out of the insertion hole 40a of the first antenna radiator 40 are pressed to press the first antenna radiator 40. ) Is fixed to the carrier 32. In addition, the first antenna radiator 40 may be fixed to the carrier 32 by a hook structure.

The first antenna radiator 40 has a length that can be operated in one or more bands of various bands for mobile communication, for example, a half wavelength (λ / 2) or a quarter wavelength (λ / 4) or the like. It may be formed to have. In addition, the first antenna radiator 40 may additionally have a stub or a pattern for a higher band that is vertically attached to the main strip.

The first antenna radiator 40 includes a signal feed part 41 for feeding power and a ground feed part 42 short-circuited to the ground feed part 42. The signal feed section 41 and the ground feed section 42 are located relative to the carrier 32 and the distance between the signal feed section 41 and the ground feed section 42 so as to meet the desired resonance frequency and band. Can be adjusted.

The signal feed part 41 and the ground feed part 42 are formed in an elastic spring shape for accurate contact. In response, the signal feed part 41 and the ground feed part 42 contact the main PC ratio 31. The contact pad 38 is provided. Therefore, when the antenna assembly 30 is assembled, the signal feed part 41 and the ground feed part 42 are elastically deformed to the contact pad 38 and remain in contact with each other.

The second antenna radiator 50 is housed inside the carrier 32. Referring to FIG. 4, the second antenna radiator 50 includes an antenna substrate 51, a first pattern portion 53, a second pattern portion 55, a chip structure 57, and a third pattern portion 59. Doing.

The antenna substrate 51 is formed in a shape that can be accommodated in the carrier 32, and the insertion hole 56 is positioned in some places to be fixed to the second mounting surface 34 formed on the inner surface of the carrier 32. Formed.

The first pattern portion 53 is patterned with copper foil on the antenna substrate 51 in a predetermined form, and an end of the first pattern portion 53 is a through hole or via formed in the antenna substrate 51. And the second pattern portion 55 by means of 54 and the like.

The second pattern part 55 has a shape in which its body is separated from the antenna substrate 51 and patterned in the form of a meander line in space. According to FIG. 4, the second pattern portion 55 runs parallel to the plane perpendicular to the antenna substrate 51.

A chip structure 57 is formed on the bottom surface of the antenna substrate 51 to which the end portion of the second pattern portion 55 is fixed. The chip structure 57 may be formed in a box shape having a constant dielectric constant, and a metal plating may be formed on the surface of the chip structure 57 so that the second pattern portion 55 may be easily welded.

FIG. 5 is a cross-sectional view of the antenna assembly according to the present invention, and FIG. 6 is a cross-sectional view of the antenna assembly.

According to these drawings, the carrier 32 is comprised by the horizontal support part 32a and the vertical support part 32b. The horizontal support part 32a is formed in parallel with the ground surface G, the outer surface forms the 1st mounting surface 34, and the inner surface forms the 2nd mounting surface 35. As shown in FIG. Accordingly, the first antenna radiator 40 and the second antenna radiator 50 are stacked through the first mounting surface 34 and the second mounting surface 35 of the horizontal support part 32a of the carrier 32. Is wearing.

The vertical support part 32b supports the horizontal support part at a constant height with respect to the ground plane G. These horizontal support portion 32a and vertical support portion 32b may be formed integrally in the process of molding the carrier 32.

An end portion of the second pattern portion 55 is positioned at the side of the chip structure 57, and a third surface of the chip structure 57 is electromagnetically coupled with the second pattern portion 55. The pattern portion 59 is provided.

The third pattern portion 59 is formed to have a distance and a length to secure a capacitance component with respect to the first pattern portion 53 or the second pattern portion 55. That is, the third pattern part 59 has an effect of widening the resonance bandwidth of the second antenna radiator 50 by generating a capacitance component with respect to the first pattern part 53 or the second pattern part 55. This is particularly useful when the second antenna emitter 50 is in charge of a high band, thereby expanding the band in which the second antenna emitter 50 is in charge.

The feeding pad 52 for feeding the second antenna radiator 50 having the first pattern portion 53, the second pattern portion 55, and the third pattern portion 59 to one side of the antenna substrate 51 as described above. Is formed, the main PC ratio 31 is provided with a spring-type elastic connection portion 37 so as to be elastically in contact with the feed pad (52). Accordingly, when the antenna assembly 30 is mounted, the signal feeding part 41, the ground feeding part 42, and the elastic connecting part 37 of the first antenna radiator 40 are elastically bent, and the contact pad 38 is provided. Is in contact with each.

The antenna substrate 51 may include a matching unit 58 that matches a signal of the second antenna radiator 50. The matching unit 58 may be implemented in a form in which elements having an inductance component or a capacitance component are surface mounted technology (SMT) on the antenna substrate 51 or by patterning the metal itself on the antenna substrate 51. Can be implemented. Therefore, the radio characteristic of the second antenna radiator 50 is effectively controlled by the matching unit 58 disposed directly on the antenna substrate 51.

By such a configuration, the first antenna radiator 40 and the second antenna radiator 50 are appropriately spatially arranged in accordance with the bands on the carrier 32 so as to secure their own radiation characteristics, but also the volume of the antenna assembly 30. The increase of can be minimized. The portable terminal 1 can thus be made small and slim.

7 is a view showing a standing wave ratio (VSWR) chart for showing radio characteristics of the antenna assembly related to the present invention.

According to FIG. 7, it is confirmed that the antenna assembly 30 has resonance in two frequency bands. That is, parts below 3dB in the low band show that it can fully operate in the CDMA DCN band (A) of 824-894 MHz. At the same time, high frequencies can operate in the CDMA US-PC band (C) from 1850 to 1990 MHz, the Advanced Wireless Services (AWS) band (B) from 1710 to 1755 MHz, and the AWS2 band (D) from 2110 to 2150 MHz. Show that there is. Thus, the antenna assembly 30 can exhibit high performance at low frequencies, while also receiving various high frequency wireless services. Nevertheless, the volume or size of the antenna assembly 30 is relatively large.

7 illustrates some specific bands, the present invention is not limited thereto, and the first antenna radiator 40 and the second antenna radiator 50 constituting the antenna assembly 30 are operable to operate in various frequency bands. Can be adjusted.

8 is a block diagram of a portable terminal according to the present invention.

One example of the present invention is a plurality of wireless communication modules (71, 72, 73), the control unit (20, 21), the image input unit 17, the sound input unit 24, the display unit 15, the sound output unit ( 16), the external interface 25, the broadcast receiving module 75, the memory 74, the power supply unit 23 and the control unit 70.

The controller 70 typically controls the overall operation of the mobile terminal. For example, voice communication, data communication, video communication, and the like.

Each wireless communication module 71, 72, 73 transmits / receives a radio signal with an external base station through each antenna radiator 40, 50, 60. The wireless communication module (71, 72, 73) is responsible for the transmission and reception of voice data, text data, video data and control data under the control of the control unit 70 for this purpose, and a transmission unit for modulating and transmitting a signal to be transmitted, and the received signal It includes a receiver for demodulating.

The operation units 20 and 21 are configured as shown in FIG. 1 to provide the control unit 70 with key input data input by the user for controlling the operation of the terminal. The operation units 20 and 21 are composed of a dome switch, a touch pad (static pressure / capacitance), a jog wheel, a jog switch, and the like.

The image input unit 17 processes image frames such as still images or moving images obtained by the image sensor in a video call mode or a photographing mode. The processed image frame is converted into image data displayable on the display unit 15 and output to the display unit 15.

The image frame processed by the image input unit 17 is stored in the memory 74 under the control of the controller 70 or transmitted to the outside through the wireless communication modules 71, 72, and 73.

The sound input unit 24 receives an external sound signal by a microphone in a call mode, a recording mode, a voice recognition mode, or the like, and processes the external sound signal into electrical voice data. The processed voice data is converted into a form transmittable to the mobile communication base station through the wireless communication modules 71, 72, and 73 in the call mode, and then output to the wireless communication module. In the recording mode, the processed voice data is output to be stored in the memory 74.

The sound input unit 24 may implement various noise removing algorithms for removing noise generated in the process of receiving an external sound signal.

The display unit 15 displays and outputs information processed by the portable terminal. For example, when the mobile terminal is in a call mode, the control unit 70 displays and outputs a user interface (UI) or a graphic user interface (GUI) related to the call. When the portable terminal is in the video call mode or the photographing mode, the mobile terminal displays and outputs the captured image, UI, or GUI under the control of the controller 70. When the display unit 15 includes a touch screen, the display unit 15 is used as an input device in addition to the output device.

The sound output unit 16 is a sound data or memory received from the wireless communication module (71, 72, 73) under the control of the control unit 70 in the call signal reception, call mode or recording mode, voice recognition mode, broadcast reception mode, etc. The sound data stored in 74 is converted and output to the outside.

In addition, the sound output unit 16 outputs a sound signal related to a function (for example, a call signal reception sound, a message reception sound, etc.) performed in the portable terminal. The sound output unit 16 includes a speaker, a receiver, a buzzer, and the like.

The external interface 25 may be connected to a mobile terminal using a wired / wireless headset, an external charger, a wired / wireless data port, a card socket (for example, a memory card, a SIM / UIM card), or the like. It serves as an interface with external devices. The external interface 25 receives data from an external device or receives power from the external device to transfer the data to each component in the portable terminal or to transmit data in the portable terminal to an external device.

The memory 74 may store a program for processing and controlling the control unit 70, and may provide a function for temporarily storing input / output data (for example, a phone book, a message, a still image, a video, etc.). It can also be done. This memory 74 includes the concepts of generally known hard disks, card type memory (eg SD or XD memory, etc.), flash memory, RAM, ROM, and the like.

The broadcast receiving module 75 receives a broadcast signal transmitted through a satellite or terrestrial wave, converts the broadcast signal into a broadcast data format that can be output to the sound output unit 16 and the display unit 15, and outputs the broadcast signal to the controller 70. In addition, the broadcast receiving module 75 receives additional data related to the broadcast (for example, an EPG (electric program guide), a channel list, etc.). The broadcast data and additional data converted by the broadcast receiving module 75 may be stored in the memory 74.

The power supply unit 23 receives an external power source and an internal power source under the control of the control unit 70 to supply power for operation of each component.

The portable terminal 1 may include a plurality of wireless communication modules 71, 72, and 73 as the wireless service is increased, and accordingly, the antenna radiator may be provided as shown in FIGS. 4 to 6. It can be formed on a more seating surface in addition to the form mounted on the first seating surface and the second seating surface, and each antenna radiator can be operatively patterned in a plurality of bands.

The antenna assembly and the portable terminal having the same described above are not limited to the configuration and method of the above-described embodiments, but the embodiments may be modified in whole or in part in order to enable various modifications. It may alternatively be configured in combination.

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

2 is an exploded perspective view of the portable terminal of FIG. 1 to show an antenna assembly related to the present invention.

Figure 3 is an assembled perspective view of the antenna assembly related to the present invention

4 is an exploded perspective view of the antenna assembly of FIG.

5 is a cross-sectional side view of the antenna assembly according to the present invention.

Figure 6 is a cross-sectional view of the antenna assembly related to the present invention from the back

7 is a standing wave ratio chart for showing the radio characteristics of the antenna assembly related to the present invention.

8 is a block diagram of a portable terminal according to the present invention.

Claims (11)

A dielectric carrier having a first mounting surface formed at a first height relative to the ground surface and a second mounting surface formed at a second height lower than the first height; A first antenna radiator mounted on the first mounting surface; And A second antenna radiator mounted on the second mounting surface and operating at a resonant frequency band higher than that of the first antenna radiator; The carrier may include a horizontal support having a horizontal shape, an outer surface of which forms the first mounting surface and an inner surface of the carrier that forms the second mounting surface; And It includes a vertical support for supporting the horizontal support at a constant height relative to the ground surface, The second antenna radiator may include: an antenna substrate on which at least one connection pad for power feeding is formed and fixed in parallel to the second mounting surface; A conductive first pattern portion formed on an upper surface of the antenna substrate; And The antenna assembly is fixed to the bottom surface of the antenna substrate, the antenna assembly including a conductive second pattern portion formed along a vertical plane perpendicular to the antenna substrate. delete The method of claim 1, The first antenna radiator includes a signal feeding part for feeding and a ground feeding part shorted to the ground surface. The method of claim 3, And the signal feed part and the ground feed part are formed in an elastic spring shape. delete The method of claim 1, The lower surface of the antenna substrate is further provided with a chip structure fixed to the antenna substrate, An end portion of the second pattern portion is fixed to the chip structure. The method according to claim 6, And a conductive third pattern portion electromagnetically coupled to the second pattern portion on a surface of the chip structure. 8. The method of claim 7, The third pattern portion is an antenna assembly, characterized in that formed with a distance and length to secure a capacitance component with respect to the first pattern portion or the second pattern portion. The method of claim 1, The ground plane is formed in the main PC ratio, the main assembly is an antenna assembly, characterized in that the elastic connection for attaching elastically to the connection pad. The method of claim 1, The antenna substrate further comprises a matching unit for matching the signal of the second antenna radiator. A portable terminal equipped with the antenna assembly of any one of claims 1, 3, 4, and 6 to 10.

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