WO2012109814A1 - 一种调频天线实现装置及移动终端 - Google Patents

一种调频天线实现装置及移动终端 Download PDF

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Publication number
WO2012109814A1
WO2012109814A1 PCT/CN2011/072622 CN2011072622W WO2012109814A1 WO 2012109814 A1 WO2012109814 A1 WO 2012109814A1 CN 2011072622 W CN2011072622 W CN 2011072622W WO 2012109814 A1 WO2012109814 A1 WO 2012109814A1
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Prior art keywords
antenna
fpc
mobile terminal
circuit board
signal
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PCT/CN2011/072622
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English (en)
French (fr)
Inventor
何文卿
Original Assignee
中兴通讯股份有限公司
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Publication of WO2012109814A1 publication Critical patent/WO2012109814A1/zh

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/12Supports; Mounting means
    • H01Q1/22Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/36Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith

Definitions

  • the present invention relates to the field of mobile communications, and in particular, to an implementation apparatus for a frequency modulation antenna and a mobile terminal integrated with the same.
  • the Frequency Modulation (FM) function is a standing function of current mobile terminals.
  • a mobile terminal usually uses a headset as an FM antenna to receive FM signals. Headphones
  • it is not a necessary component to realize most of the main functions of mobile terminals, and one of the conditions for receiving FM signals through the headphones as FM antennas is to always maintain an effective connection between the headphones and the mobile terminals. Therefore, the inconvenience of the headset can greatly reduce the user's willingness to use the FM broadcast function, and also increases the difficulty for the user to receive the FM signal through the mobile terminal.
  • the built-in antenna is affected by the user's hand, which will reduce the quality of the FM broadcast signal. Therefore, although the implementation of the FM signal by the built-in antenna has been implemented in the prior art, the drawbacks are also obvious.
  • the present invention provides a frequency modulation (FM) antenna implementing apparatus, the apparatus comprising: a circuit board including a metal trace, an isolation device, and a matching circuit, the metal trace on the circuit board and the ground or One end of the power connection is connected to the isolation device and the matching circuit, the isolation device and the matching circuit are connected in parallel, and the other end of the isolation device is grounded or powered, wherein: the circuit board including the metal trace is set as: as a frequency modulation antenna, receiving The isolation device is configured to: isolate the FM signal; the matching circuit is configured to: filter the FM signal received by the circuit board, and output the filtered FM signal.
  • the circuit board including the metal trace is a flexible printed circuit board (FPC) or a printed circuit board (FPC) or a printed circuit board (FPC) or a printed circuit board (FPC) or a printed circuit board (FPC) or a printed circuit board (FPC) or a printed circuit board (FPC) or a printed circuit board (FPC) or a printed circuit board (FPC
  • the isolation device is a magnetic bead of 1000 ohms or more. Wherein, the magnetic beads are 1500 ohms.
  • the device further includes a low noise amplifier; the matching circuit inputs the filtered FM signal to the low noise amplifier, and the low noise amplifier filters out the noise and outputs the FM signal to the FM receiving chip.
  • the matching circuit includes an inductor L1. One end of the L1 is connected to the FPC, and the other end is connected to the input of the FM chip. The value of the L1 is [100nH, 1000nH]. among them,
  • L1 The value of L1 is 200 nH. among them,
  • the matching circuit includes a first inductor L1 and a second inductor L2.
  • One end of the L1 is connected to the FPC, and the other end is connected to the input of the FM chip.
  • One end of the L2 is connected to the FM chip of the L1.
  • One end is connected and the other end is grounded; the range of L1 is [ ⁇ , ⁇ ], and the range of L2 is [47 ⁇ , 270 ⁇ ]. among them,
  • the present invention also provides a mobile terminal comprising the FM antenna implementing apparatus as described above.
  • the technical solution of the present invention uses a circuit board including a metal trace as an FM signal receiving antenna in a mobile terminal, which overcomes the defect that the existing built-in standard component antenna occupies a large space, and can implement the mobile terminal.
  • the miniaturization design and the FM external release function enhance the user experience of the FM broadcast function.
  • FIG. 1 is a schematic structural view of a built-in FM antenna device in a mobile terminal according to Embodiment 1 of the present invention
  • 2 is a schematic diagram of a matching circuit in Embodiment 1
  • FIG. 3 is a schematic structural view of a built-in FM antenna in a mobile terminal according to Embodiment 2 of the present invention
  • FIG. 4a and FIG. 4b are schematic diagrams of a FPC routing direction
  • FIG. 4 is a schematic structural diagram of a mobile terminal
  • FIG. 6 is a schematic structural diagram of a mobile terminal according to Embodiment 5 of the present invention
  • FIG. 7 is a schematic structural diagram of a mobile terminal according to Embodiment 6 of the present invention.
  • Embodiment 1 This embodiment uses a Flexible Printed Circuit Board (FPC) as an FM antenna built in a mobile terminal.
  • the FPC may be an FPC having electrical characteristics in the mobile terminal, that is, an FPC as a part of the circuit, and does not exclude the case where an FPC is separately designed as an FM antenna.
  • FIG. 1 is a schematic structural view of a built-in FM antenna device according to an embodiment of the present invention.
  • the FPC of the Light Emitting Diode (LED) lamp circuit to the LED lamp is multiplexed into an FM antenna.
  • the FPC used as other electrical functions may also be multiplexed into FM antenna. As shown in FIG.
  • the isolation device is connected to the isolation device and the matching circuit 120, and the isolation device and the matching circuit are connected in parallel, and the other end of the isolation device is grounded or powered;
  • FPC (specifically, the circuit board)
  • the metal trace is used as an FM antenna for receiving the FM signal;
  • the isolation device is used for isolating the FM signal to ensure the normal function of the circuit where the FPC is located;
  • the matching circuit is used for filtering the FM signal received by the FPC.
  • the filtered FM signal is output.
  • the isolation device is a 1500 Ohm (ohm) magnetic bead.
  • the magnetic bead having a 100 MHz impedance greater than 1000 Ohm can achieve FM reception, and the larger the value, the better the effect.
  • it can also be realized by using a large inductor.
  • the inductor can be realized by using an inductor of 20 ⁇ 1 ⁇ or more, but the cost of using the magnetic beads is low.
  • the isolation device needs to ensure DC pass-through and isolate the FM signal. This is to prevent the FM signal leakage from affecting the performance of the circuit where the FPC is located.
  • the device further includes: a low noise amplifier 130, the matching circuit inputs the filtered FM signal to the low noise amplifier, and the low noise amplifier filters out the noise and outputs the FM signal to the FM receiving chip (ie, the FM chip 140 in FIG. 1).
  • the FM chip demodulates the FM signal into a voice signal, and inputs the voice signal to the baseband chip 150 for audio processing and amplification, and then outputs it through a speaker 160.
  • the matching circuit can have two structures: Structure 1: As shown in FIG.
  • the first inductor L1 and the second inductor L2 are included, wherein one end of the L1 is connected to the FPC, and the other end is connected to the input of the FM chip; one end of the L2 and the L1 The one end connected to the FM chip is connected, and the other end is grounded; the value of L1 is [ ⁇ , ⁇ ], preferably 200nH, and the range of L2 is [47 ⁇ , 270 ⁇ ], preferably 68 ⁇ .
  • the matching circuit is usually implemented with a large inductor (L1 in Figure 2), which has a good filtering effect on signals above 800MHz, which can enhance the receiving performance of the FM.
  • L2 in the figure is used to improve the reception performance of low frequency FM signals (such as [87 Hz, 99 Hz]).
  • the inductance in the figure is a better value.
  • the FM matching circuit may include only L1 and not L2, such as structure 2 below. Structure 2: includes only L1 and does not include L2, wherein one end of L1 is connected to the FPC, and the other end is connected to the input of the FM chip, and the value of L1 is [100nH, 1000nH], preferably 200n ⁇ .
  • the FM antenna of the FPC material is disposed in the mobile terminal in a serpentine manner, and the length of the trace (ie, the total length of the FM antenna) can be relatively long, and is close to 1/4 wavelength of the FM signal.
  • the total length of the FM antenna is 75 cm (cm) (quarter wavelength), and the area of the FM antenna area is recommended to be no less than 1 cm 2 . Since the area is less than 1 cm 2 , the performance cannot be guaranteed. The minimum can not be less than 0.5 cm 2 . .
  • 200 is the feeding end of the FM antenna.
  • the FM antenna of the FPC material of the embodiment has a planar structure and has similar performance to a normal spiral antenna, and has better performance in the far field.
  • Embodiment 2 This embodiment uses a Printed Circuit Board (PCB) instead of the FPC in Embodiment 1 to realize FM reception.
  • Fig. 3 is a view showing the position of a PCB using the PCB as a built-in FM antenna in the mobile terminal 300. Described in the schematic diagram is a mobile terminal 300 with an FM external release function.
  • the FM antenna 310 of the PCB material is located in a central portion 320 of the mobile terminal, and is connected to the main board of the mobile terminal through the elastic foot.
  • the FM antenna 310 of the PCB material is disposed in the middle of the mobile terminal 300, and the space available for receiving the FM signal is large.
  • the FM antenna 310 under the FM antenna 310, there is a main board of the mobile terminal 300, and the electrical connection with the main board is relatively easy.
  • the FM antenna 310 is disposed at the upper and lower portions of the mobile terminal 300 and the edge of the mobile terminal 300, and the principle is that the distance from the main antenna (the antenna for mobile communication) of the mobile terminal 300 is at least 0.5 cm or more. Just fine.
  • the connection between the PCB and other circuit parts is the same as that of the embodiment 1.
  • the FPC in the embodiment 1 is replaced by a PCB, and details are not described herein.
  • PCB and FPC can be collectively referred to as a circuit board containing metal traces, and the metal traces on it are used to receive FM signals. The metal traces are considered as part of the board and are not described.
  • the following embodiment describes how the FPC in the mobile terminal including the apparatus of the above embodiment 1 is designed.
  • the mobile terminal using the PCB as the FM antenna can design the PCB with reference to the following embodiments.
  • Example 3
  • the FPC material FM antenna is built in the mobile terminal and preferably follows a setting principle.
  • the setting principle can be visualized by using FIG. 4a and FIG. 4b.
  • the setting rule is specifically as follows: Once the FM antenna area of the FPC material is If the length is greater than the width, then the direction of the serpentine line is along the length direction. In the case where the length is guaranteed to be the longest, the width needs to be considered. Make FM The antenna is as long as possible rather than wide. The design of FM antennas with irregular patterns also follows this principle.
  • Figures 4a and 4b show schematic diagrams of two FM antenna layouts, respectively, in which the long side of the FM antenna area is the length direction of the FM.
  • Embodiment 4 A mobile terminal of this embodiment incorporates an FPC antenna for receiving an FM signal.
  • the mobile terminal of this embodiment is a flip phone.
  • the motherboard and daughter board of the flip phone there are conditions for mounting an FM antenna of the FPC material, wherein in order to consider the reliability of the connection and the bendability, the FPC buckle is used on the main board and the daughter board of the flip phone. connection.
  • 510 is the first FPC on the first flip cover
  • 520 is the second FPC on the second flip cover
  • 530 is the third FPC connecting the first FPC and the second FPC
  • 540 is the FPC connection buckle for connecting a first flip cover and a second flip cover and for connecting the first FPC and the second FPC, the first FPC, the second FPC and the third FPC being used as an FM antenna, and further having other electrical functions, such as for connecting LED lights, etc.
  • Embodiment 5 A mobile terminal of this embodiment incorporates an FPC antenna for receiving an FM signal.
  • the mobile terminal of this embodiment is a slide phone.
  • On the main board and the daughter board of the slider phone there are conditions for mounting an FM antenna of FPC material, wherein, in order to consider the reliability of the connection and the bendability, the FPC card is on the main board and the daughter board of the slider phone.
  • the buckle is connected.
  • 610 is the first FPC on the upper sliding cover
  • 620 is the second FPC on the sliding cover
  • 630 is the third FPC connecting the first FPC and the second FPC
  • 640 is the buckle for FPC connection
  • the above An FPC, a second FPC, and a third FPC can be multiplexed into an FM antenna.
  • the above only uses a flip phone and a slide phone as an example, but other types of mobile phones, such as a tablet phone, can also use the device described in Embodiment 1 or 2 to implement FM reception.
  • Embodiment 6 A mobile terminal of this embodiment incorporates an FPC antenna for receiving an FM signal.
  • 710 is an FM antenna on the rear case
  • 720 is an FM antenna on the battery case.
  • the battery case is detachable, two FM antennas are respectively designed
  • 730 is a main board of the mobile terminal.
  • the FM antenna of the FPC material extends from the rear case of the mobile terminal to the battery case of the mobile terminal.
  • this embodiment is an FPC material FM antenna connected to the rear case from the main board through a first foot (740), passing another height.
  • the higher second leg (750) is connected to the FPC material FM antenna on the battery case.
  • the two legs are connected to each other.
  • the FPC-based FM antenna does not affect the reception of FM signals regardless of whether the FPC is under the headroom, and many implementations can achieve better reception than the standard built-in FM antenna.
  • the use of the FM broadcast on the mobile terminal is simplified, and the space occupied by the mobile terminal is small, so that the design of the mobile terminal can be more flexible.
  • the present invention overcomes the drawback that the existing built-in standard component antenna occupies a large space, can realize the miniaturization design of the mobile terminal, and realizes the FM external release function, thereby improving the user experience of the FM broadcast function.

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  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
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Abstract

本发明公开了一种调频天线实现装置,该装置包括:包含金属走线的电路板、隔离器件、以及匹配电路,所述电路板上金属走线与地或电源连接的一端连接隔离器件和匹配电路,所述隔离器件和匹配电路并联,所述隔离器件的另一端接地或电源,其中:所述包含金属走线的电路板设置为:作为调频天线,接收调频信号;所述隔离器件设置为:隔离调频信号;所述匹配电路设置为:对所述电路板接收到的调频信号进行滤波,输出滤波后的调频信号。本发明还公开了一种移动终端。本发明可以实现移动终端的小型化设计,而且实现了FM外放功能,提高了FM广播功能的用户体验。

Description

一种调频天线实现装置及移动终端
技术领域 本发明涉及移动通讯领域, 尤其涉及一种调频天线的实现装置以及集成 该装置的移动终端。
背景技术 调频(Frequency Modulation, FM ) 功能是目前移动终端的一个常备功 能。 目前移动终端上通常使用耳机充当 FM天线进行 FM信号的接收。 耳机 对于移动终端而言, 其并不是实现移动终端绝大部分主要功能的必备组件, 而通过耳机充当 FM天线接收 FM信号的条件之一就是需要始终保持耳机与 移动终端的有效连接。 因此, 耳机的携带不便会大大降低用户使用 FM广播 功能的意愿, 也增加了用户通过移动终端接收 FM信号的难度。
也有一部分移动终端不釆用耳机而是通过在终端内部集成内置天线的形 式来接收 FM信号。 但是, 较为常见的内置天线, 釆用的是陶瓷天线技术进 行开发的标准件天线, 需要在移动终端的主板上进行焊接, 这样会造成内置 天线在移动终端中占用的空间较大, 造成终端较难实现小型化的设计和使用 简便。 而且, 通过内置天线接收 FM信号, 由于设计上的原因 (主要是移动 终端内部空间受限的原因) , 难以在净空较少的情况下进行良好的 FM信号 的接收。 而留出足够的净空以更高质量地接收 FM信号就意味着移动终端主 板上的剩余布局空间会减少, 而且也为移动终端的小型化设计增加了难度。 再者, 用户手持移动终端收听 FM广播时, 内置天线受用户手持影响, 会降 低 FM广播信号的质量。 因此, 虽然现有技术中已有通过内置天线来接收 FM信号的实现, 但是 其弊端也是艮明显的。
发明内容 本发明所要解决的技术问题是提供一种调频天线实现装置及移动终端, 以克服现有的内置标准件调频天线在移动终端中占用较大空间的缺陷。 为了解决上述技术问题, 本发明提供了一种调频 (FM ) 天线实现装置, 该装置包括: 包含金属走线的电路板、 隔离器件、 以及匹配电路, 所述电路 板上金属走线与地或电源连接的一端连接隔离器件和匹配电路, 所述隔离器 件和匹配电路并联, 所述隔离器件的另一端接地或电源, 其中: 所述包含金属走线的电路板设置为: 作为调频天线, 接收调频信号; 所述隔离器件设置为: 隔离调频信号; 所述匹配电路设置为: 对所述电路板接收到的调频信号进行滤波, 输出 滤波后的调频信号。 其中, 所述包含金属走线的电路板为柔性印刷电路板 ( FPC )或者为印刷电路 板 ( PCB ) 。 其中,
所述隔离器件为 1000欧姆以上的磁珠。 其中, 所述磁珠为 1500欧姆。 所述装置还包括低噪声放大器; 所述匹配电路将滤波后的调频信号输入至所述低噪声放大器, 所述低噪 声放大器滤除噪声后输出调频信号至调频接收芯片。 其中, 所述匹配电路包括电感 L1 , 所述 L1的一端与 FPC连接, 另一端与所述 调频芯片的输入相连, 所述 L1的取值范围为 [100nH,1000nH]。 其中,
所述 L1的取值为 200nH。 其中,
所述匹配电路包括第一电感 L1和第二电感 L2, 所述 L1的一端与 FPC 连接, 另一端与所述调频芯片的输入相连, 所述 L2的一端与所述 L1的与调 频芯片相连的一端连接,另一端接地;所述 L1的取值范围为 [ΙΟΟηΗ,ΙΟΟΟηΗ] , 所述 L2的取值范围为 [47ηΗ,270ηΗ]。 其中,
所述 L1的取值为 200ηΗ, 所述 L2的取值为 68ηΗ。 其中, 所述金属走线的总长度大于调频信号的 1/4波长, 且所述金属走线区域 的面积不小于 1平方厘米。 为了解决上述技术问题, 本发明还提供了一种移动终端, 其包括如上所 述的调频天线实现装置。
与现有技术相比, 本发明的技术方案釆用包含金属走线的电路板作为移 动终端中的 FM信号接收天线, 克服了现有内置标准件天线占用空间较大的 缺陷, 可以实现移动终端的小型化设计, 而且实现了 FM外放功能, 提高了 FM广播功能的用户体验。 本发明的其它特征和优点将在随后的说明书中阐述, 并且, 部分地从说 明书中变得显而易见, 或者通过实施本发明而了解。 本发明的目的和其他优 点可通过在说明书、权利要求书以及附图中所特别指出的结构来实现和获得。
附图概述 附图用来提供对本发明技术方案的进一步理解, 并且构成说明书的一部 分, 与本发明的实施例一起用于解释本发明的技术方案, 并不构成对本发明 技术方案的限制。 在附图中: 图 1为本发明实施例 1的移动终端中的内置 FM天线装置的结构示意图; 图 2为实施例 1中的匹配电路的示意图; 图 3为本发明实施例 2的移动终端中的内置 FM天线结构示意图; 图 4a和 4b为 FPC走线方向示意图; 图 5为本发明实施例 4的一种移动终端的结构示意图; 图 6为本发明实施例 5的一种移动终端的结构示意图; 图 7为本发明实施例 6的一种移动终端的结构示意图。
本发明的较佳实施方式 以下将结合附图及实施例来详细说明本发明的实施方式, 借此对本发明 如何应用技术手段来解决技术问题, 并达成技术效果的实现过程能充分理解 并据以实施。 需要说明的是, 如果不冲突, 本发明实施例以及实施例中的各个特征的 相互结合, 均在本发明的保护范围之内。 实施例 1 本实施例釆用柔性印刷电路板(Flexible Printed Circuit Board, FPC )作 为 FM天线内置在移动终端中。 该 FPC可以是移动终端中具有电气特性的 FPC, 即作为电路一部分的 FPC, 也不排除单独设计一 FPC作为 FM天线的 情况。 图 1为本实施例内置 FM天线装置的结构示意图。 在本实施例中, 将发 光二极管( Light Emitting Diode, LED )灯电路到 LED灯之间的 FPC复用为 FM天线, 在其他实施例中, 也可以将用作其他电气功能的 FPC复用为 FM 天线。 如图 1所示, 该 FPC上金属走线与地或电源连接的一端连接隔离器件 和匹配电路 120, 隔离器件和匹配电路并联, 隔离器件的另一端接地或电源; FPC (具体为该电路板上的金属走线)作为 FM天线使用, 用于接收调频信 号; 该隔离器件用于隔离调频信号, 以保证 FPC所在电路的正常功能; 该匹 配电路用于对 FPC接收到的调频信号进行滤波, 输出滤波后的调频信号。 本实施例中隔离器件为 1500Ohm (欧姆)的磁珠, 在其他实施例中, 在 100MHz大于 1000 Ohm阻抗的磁珠均可实现 FM的接收,且值越大,效果越 好。 除了釆用磁珠外, 还可釆用大电感实现, 例如釆用 20μ1ι (微亨)以上的 电感也可实现本实施例,但釆用磁珠的成本较低。 隔离器件需保证直流通过、 隔离 FM信号, 这是为了防止 FM信号外泄影响 FPC所在电路的性能。 上述装置优选还包括: 低噪声放大器 130 , 匹配电路将滤波后的调频信 号输入至低噪声放大器, 低噪声放大器滤除噪声后输出调频信号至调频接收 芯片 (即图 1中的 FM芯片 140 ) , FM芯片将 FM信号解调为语音信号, 将 语音信号输入到基带芯片 150 进行音频的处理和放大之后, 通过扬声器 ( Speaker ) 160输出。 匹配电路可以有两种结构: 结构 1 : 如图 2所示, 包括第一电感 L1和第二电感 L2 , 其中 L1的一端 与 FPC连接, 另一端与调频芯片的输入相连; L2的一端与 L1的与调频芯片 相连的一端连接, 另一端接地; 该 L1的取值范围为 [ΙΟΟηΗ,ΙΟΟΟηΗ] , 优选为 200nH, L2的取值范围为 [47ηΗ,270ηΗ] , 优选为 68ηΗ。
匹配电路通常釆用大电感实现(图 2中 L1 ) , 其对 800MHz以上的信号 有很好的滤波效果, 可以增强调频的接收性能。 图中的 L2用于提高低频调 频信号 (如 [87Hz, 99Hz] ) 的接收性能。 图中的电感取值为较优值。 在其他 实施例中, FM匹配电路可以仅包括 L1而不包括 L2 , 如以下结构 2。 结构 2: 仅包括 L1不包括 L2 , 其中, L1的一端与 FPC连接, 另一端与 所述调频芯片的输入相连, 所述 L1 的取值范围为 [100nH,1000nH] , 优选为 200ηΗ。 本实施例中,该 FPC材质的 FM天线以蛇形走线方式设置在移动终端内, 其走线长度(即 FM天线总长度 )可以比较长, 接近 FM信号的 1/4波长, 本实施例中 FM天线总长度为 75厘米( cm ) (四分之一波长 ) , FM天线区 域面积建议不小于 1平方厘米, 因为面积小于 1平方厘米, 性能一般不能得 到保证, 最低不能低于 0.5平方厘米。 图中 200为 FM天线的馈电端。 本实 施例的 FPC材质的 FM天线釆用平面结构, 性能类似于法向螺旋天线, 在远 场处具有较好的性能。 上述长度及面积的限定并不是实现 FM功能的必要条件, 也就是说, FM 天线的总长度也可以不考虑波长, 通过试验证实, 10CM的 FPC材质的 FM 天线也可以保证 FM的接收。
实施例 2 本实施例釆用印刷电路板 ( Printed Circuit Board, PCB )代替实施例 1 中的 FPC实现 FM的接收。 图 3为釆用 PCB作为内置 FM天线的 PCB在移 动终端 300中的位置示意图。 本示意图中所描述的是带有 FM外放功能的移 动终端 300,其 PCB材质的 FM天线 310位于移动终端的中部一区域 320中, 通过弹脚和移动终端的主板进行连接。 PCB材质的 FM天线 310设置于移动 终端 300的中部, 接收 FM信号时可以利用的空间较大。 另外 FM天线 310 下面有移动终端 300的主板, 其与主板间的电气连接也相对容易。 实际上, 该 FM天线 310设置在移动终端 300的上部和下部以及移动终端 300的边沿 也是可以的, 原则是和移动终端 300的主天线(用于移动通信的天线) 的距 离至少达到 0.5cm以上即可。 该 PCB与其他电路部分的连接同实施例 1 ,仅需将实施例 1中的 FPC替 换为 PCB即可, 此处不再赘述。 PCB和 FPC可以统称为包含金属走线的电 路板, 其上的金属走线用于进行 FM信号的接收, 文中将金属走线视为电路 板的一部分, 未区分描述。
下述实施例描述包含上述实施例 1装置的移动终端中 FPC如何设计,以 PCB作为 FM天线的移动终端可参照下述实施例设计 PCB。 实施例 3
本实施例中, FPC材质的 FM天线内置在移动终端中优选地遵循一个设置原 则, 该设置原则可以通过图 4a和 4b得以形象化展示, 该设置规则具体为: 一旦 FPC材质的 FM天线区域的长度大于宽度,那么蛇形线的走线方向 就是沿着长度方向,在长度保证达到最长的情况下, 才需要考虑宽度。使 FM 天线尽可能长而不是宽。 不规则图形的 FM天线的设计也要遵循此原则。 图 4a和图 4b分别示出了两种 FM天线布局示意图, 在两种布局中, FM天线区 域的长边为 FM的长度方向。
PCB作为 FM天线时也可遵循此原则。
实施例 4 本实施例的移动终端内置有用于接收 FM信号的 FPC天线。如图 5所示, 本实施例的移动终端为翻盖手机。 在该翻盖手机的主板和子板上均具有贴装 FPC材质的 FM天线的条件, 其中, 为了考虑到连接的可靠性和可弯折性, 在翻盖手机的主板和子板上, 由 FPC卡扣进行连接。 图中, 510为第一翻盖 上的第一 FPC, 520为第二翻盖上第二 FPC, 530为连接第一 FPC和第二 FPC 的第三 FPC, 540为 FPC连接用卡扣, 用于连接第一翻盖和第二翻盖以及用 于连接第一 FPC和第二 FPC, 上述第一 FPC、 第二 FPC以及第三 FPC均可 用作 FM天线, 此外还可具有其他电气功能, 如用于连接 LED灯等。
实施例 5 本实施例的移动终端内置有用于接收 FM信号的 FPC天线。如图 6所示, 本实施例的移动终端为滑盖手机。 在该滑盖手机的主板和子板上均具有贴装 FPC材质的 FM天线的条件, 其中, 为了考虑到连接的可靠性和可弯折性, 在滑盖手机的主板和子板上, 均 FPC卡扣进行连接的。 图中, 610为上滑盖 上的第一 FPC, 620为下滑盖上的第二 FPC, 630为连接第一 FPC和第二 FPC 的第三 FPC, 640为 FPC连接用卡扣, 上述第一 FPC、 第二 FPC以及第三 FPC均可复用为 FM天线。 上面仅以翻盖手机和滑盖手机为例进行说明, 但其他类型的手机, 如直 板手机等也可以釆用实施例 1或 2所述的装置实现 FM的接收。
实施例 6 本实施例的移动终端内置有用于接收 FM信号的 FPC天线。如图 7所示, 图中 710为后壳上的 FM天线, 720为电池壳上的 FM天线, 考虑到电池壳 可拆卸, 因此分别设计两段 FM天线, 730为移动终端的主板。 本实施例中 FPC材质的 FM天线从移动终端的后壳延伸到移动终端电池壳上。 考虑到连 接的可靠性, 以及电池壳通常高于后壳的结构特点, 本实施例是从主板上通 过一第一弹脚(740 )连接后壳上的 FPC材质的 FM天线, 通过另一个高度 更高的第二弹脚(750 )连接电池壳上的 FPC材质的 FM天线。 两个弹脚之 间是相互连接的。
通过大量的实验结果表明,釆用 FPC材质的 FM天线,无论 FPC下方是 否是净空, 均不影响 FM信号的接收效果, 且众多的实施方式均能得到优于 标准件内置 FM天线的接收效果。 而且, 与现有的陶瓷天线技术进行开发的 标准件内置天线相比, 简化了移动终端上 FM广播的使用, 且在移动终端中 占用空间小, 使得移动终端的设计可以更加的灵活。
本领域的技术人员应该明白, 上述的本发明的各组成部分可以用通用的 计算装置来实现, 它们可以集中在单个的计算装置上, 可选地, 它们可以用 计算装置可执行的程序代码来实现, 从而, 可以将它们分别制作成各个集成 电路模块,或者将它们中的多个模块制作成单个集成电路模块来实现。这样, 本发明不限制于任何特定的硬件和软件结合。 虽然本发明所揭露的实施方式如上, 但所述的内容只是为了便于理解本 发明而釆用的实施方式, 并非用以限定本发明。 任何本发明所属技术领域内 的技术人员, 在不脱离本发明所揭露的精神和范围的前提下, 可以在实施的 形式上及细节上作任何的修改与变化, 但本发明的专利保护范围, 仍须以所 附的权利要求书所界定的范围为准。
工业实用性 本发明克服了现有内置标准件天线占用空间较大的缺陷, 可以实现移动 终端的小型化设计, 而且实现了 FM外放功能, 提高了 FM广播功能的用户 体验。

Claims

权 利 要 求 书
1、 一种调频(FM )天线实现装置, 该装置包括: 包含金属走线的电路 板、 隔离器件、 以及匹配电路, 所述电路板上金属走线与地或电源连接的一 端连接隔离器件和匹配电路, 所述隔离器件和匹配电路并联, 所述隔离器件 的另一端接地或电源, 其中: 所述包含金属走线的电路板设置为: 作为调频天线, 接收调频信号; 所述隔离器件设置为: 隔离调频信号;
所述匹配电路设置为: 对所述电路板接收到的调频信号进行滤波, 输出 滤波后的调频信号。
2、 根据权利要求 1所述的装置, 其中, 所述包含金属走线的电路板为柔性印刷电路板 ( FPC )或者为印刷电路 板 ( PCB ) 。
3、 根据权利要求 2所述的装置, 其中, 所述隔离器件为 1000欧姆以上的磁珠。
4、 根据权利要求 3所述的装置, 其中, 所述磁珠为 1500欧姆。
5、 根据权利要求 2所述的装置, 所述装置还包括低噪声放大器; 所述匹配电路将滤波后的调频信号输入至所述低噪声放大器, 所述低噪 声放大器滤除噪声后输出调频信号至调频接收芯片。
6、 根据权利要求 1-5中任一项权利要求所述的装置, 其中, 所述匹配电路包括电感 L1 , 所述 L1的一端与 FPC连接, 另一端与所述 调频芯片的输入相连, 所述 L1的取值范围为 [100nH,1000nH]。
7、 如权利要求 6所述的装置, 其中: 所述 L1的取值为 200nH。
8、 如权利要求 1-5中任一项权利要求所述的装置, 其中, 所述匹配电路包括第一电感 L1和第二电感 L2, 所述 L1的一端与 FPC 连接, 另一端与所述调频芯片的输入相连, 所述 L2的一端与所述 L1的与调 频芯片相连的一端连接,另一端接地;所述 L1的取值范围为 [ΙΟΟηΗ,ΙΟΟΟηΗ] , 所述 L2的取值范围为 [47ηΗ,270ηΗ]。
9、 如权利要求 8所述的装置, 其中: 所述 L1的取值为 200ηΗ, 所述 L2的取值为 68ηΗ。
10、 如权利要求 1或 2所述的装置, 其中: 所述金属走线的总长度大于调频信号的 1/4波长, 且所述金属走线区域 的面积不小于 1平方厘米。
11、 一种移动终端, 其包括如权利要求 1-9中任一权利要求所述的调频 天线实现装置。
PCT/CN2011/072622 2011-02-14 2011-04-11 一种调频天线实现装置及移动终端 WO2012109814A1 (zh)

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