WO2010072031A1 - 用于便携式产品的fm广播接收电路 - Google Patents

用于便携式产品的fm广播接收电路 Download PDF

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Publication number
WO2010072031A1
WO2010072031A1 PCT/CN2008/073725 CN2008073725W WO2010072031A1 WO 2010072031 A1 WO2010072031 A1 WO 2010072031A1 CN 2008073725 W CN2008073725 W CN 2008073725W WO 2010072031 A1 WO2010072031 A1 WO 2010072031A1
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Prior art keywords
antenna
circuit
broadcast receiving
inductor
portable product
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PCT/CN2008/073725
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English (en)
French (fr)
Inventor
肖庆
蓝天航
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深圳世强电讯有限公司
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Priority to PCT/CN2008/073725 priority Critical patent/WO2010072031A1/zh
Publication of WO2010072031A1 publication Critical patent/WO2010072031A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06Receivers
    • H04B1/16Circuits
    • H04B1/1646Circuits adapted for the reception of stereophonic signals

Definitions

  • the present invention relates to a broadcast receiving circuit, and more particularly to an FM broadcast receiving circuit for a portable product.
  • Some products have built-in antenna design, and the design structure is generally: built-in antenna + matching circuit + tuner mode, the radio effect is generally not ideal, which is reflected in low sensitivity, strong directivity, greatly affected by the human body, far lower
  • the performance achieved by using an external antenna such as an earplug for similar products Some companies have started from the perspective of radio ICs, and developed corresponding receiving ICs for built-in antennas, which can improve the receiving performance to a certain extent, but it is still much worse than using earplugs for antennas, and is also highly directional and susceptible to human interference. The problem still exists and cannot satisfy the customer's requirements.
  • the performance issues with the built-in antenna scheme have greatly hindered its use in portable products.
  • the technical problem to be solved by the present invention is to provide an FM broadcast receiving circuit for a portable product in view of the inconvenience of the earphone antenna for the above portable product of the prior art and the low performance of the built-in antenna solution. structure.
  • the FM broadcast receiving circuit the portable product includes a casing, and an antenna, a low-noise amplifying circuit, and a radio circuit, which are sequentially electrically connected, are disposed in the casing; wherein the Q value of the antenna is between 1 and 10, And the low noise amplifier circuit includes a dynamic matching circuit.
  • the Q value of the antenna is a value less than 10 such as 2, 3, 4, 5, 6, 7, 8, or 9. .
  • the low noise amplifying circuit includes a first dynamic matching circuit, a second matching circuit, and a low noise amplifier; wherein the antenna, the A dynamic matching circuit, a low noise amplifier, a second matching circuit, and a radio circuit are sequentially connected
  • the first dynamic matching circuit includes capacitors Cl, C2, an inductor L1, resistors R1, R2, and a diode D1, wherein the resistor R1 One end, one end of the inductor L1, and the cathode of the diode D1 are respectively connected to the antenna, the other end of the resistor R1 is grounded, the other end of the inductor L1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to the anode of the diode D1, and respectively Connected to one end of the resistor R2 and one end of the capacitor C2; the other end of the resistor R2 is connected to a digital level, and its state is high or low depending on the need.
  • the other end of the capacitor C2 is connected to the pin 2 of the low noise amplifier;
  • the second matching circuit includes inductors L2, L3, and a capacitor C5, wherein one end of the inductor L2 and one end of the capacitor C5 and the inductor are respectively One end of the L3 is connected, the other end of the inductor L2 is connected to the pin 5 of the low noise amplifier; the other end of the capacitor C5 is coupled to the radio circuit; and the other end of the inductor L3 is connected to the peripheral circuit.
  • the radio circuit includes a high frequency amplifier, a mixer, an intermediate frequency amplifier, a demodulator, and a power amplifier that are sequentially electrically connected.
  • the antenna is disposed around the inside of the casing.
  • the FM broadcast receiving circuit for portable products of the present invention has the following beneficial effects: By selecting a wide-band internal antenna with high gain and low Q value, and then transmitting a broadcast signal received by the antenna to the radio circuit Before, it is amplified by a low-noise amplifier, the weak signal received by the antenna is amplified, and then sent to the radio circuit to realize the first-stage amplification outside the radio circuit and the second-stage amplification in the radio circuit, thereby improving the overall FM. Receive sensitivity; and because the antenna uses a low-Q antenna, the overall bandwidth is wide, and the back-end bandwidth widening circuit is used to meet the wide FM radio bandwidth, and the reception performance is easily affected by the human body. . Country deletion
  • FIG. 1 is a schematic block diagram of an FM broadcast receiving circuit for a portable product of the present invention
  • FIG. 2 is a circuit schematic diagram of an embodiment of the low noise amplifying circuit shown in FIG. 1.
  • the technical solution of the present invention optimizes the receiving performance of the FM broadcast receiving and receiving circuit, so that the portable product uses the built-in antenna without degrading the broadcast receiving performance.
  • the invention is characterized in that an antenna, a low-noise amplifier circuit and a radio circuit are sequentially provided in a casing of a portable product; wherein the Q value of the antenna is between 1 and 10. .
  • the bandwidth of an antenna is related to its quality factor (ie Q value).
  • Q value quality factor
  • Q10 quality factor
  • the quality factor Q is taken as 10 ⁇ , so that the built-in antenna is used for listening to the radio, and has better band-pass characteristics, and the bandwidth is relatively large.
  • the Q value quality factor measurement method of the antenna we refer to is as follows:
  • the antenna is taken as an inductor and placed in the LCR meter to test the Q value in the series mode.
  • a low noise amplifying circuit is used to amplify the signal received from the antenna for subsequent circuit processing. Since the signals from the antenna are generally very weak, the low-noise amplifier circuit is generally located very close to the antenna to reduce the loss of the signal through the transmission line. It is precisely because the low noise amplifier is located in the first stage of the entire receiver close to the antenna, it directly affects the quality of the signal received by the entire receiver. In order to ensure that the signal received by the antenna can be correctly recovered at the final stage of the receiver, the first stage amplification of the present invention produces the lowest possible noise and distortion at the same time as the amplified signal.
  • an optical enamel wire 100 ⁇ wound with a diameter of 0.2 mm may be wound around a magnetic core 100 ⁇ which is produced by proportional mixing of iron oxide, nickel oxide, copper oxide and zinc oxide materials, as an FM receiving antenna of the present invention, which realizes receiving High efficiency, low Q, wide bandwidth.
  • the Q value of the antenna is a value less than 10 such as 2, 3, 4, 5, 6, 7, 8, or 9. In a preferred embodiment, the Q value is approximately four.
  • the FM broadcast receiving circuit of the present invention is a combined component with a portable product, and the FM radio section directly receives the main band of the FM transmitter, and then passes through the first stage amplification outside the radio circuit and the second stage amplification in the radio circuit. , as well as amplifiers, etc., output to the speaker, the connection between the FM radio part and the portable product is handled by the main controller of the portable product.
  • the low noise amplifying circuit includes a first dynamic matching circuit, a second matching circuit, and a low noise amplifier; wherein, the antenna, the first dynamic matching circuit, the low noise amplifier, and the second The matching circuit and the radio circuit are electrically connected in sequence.
  • the radio circuit includes a high frequency amplifier, a mixer, an intermediate frequency amplifier, a demodulator, and a power amplifier that are electrically connected in sequence.
  • the first dynamic matching circuit includes capacitors Cl, C2, an inductor L1, resistors R1, R2, and a diode D1, wherein one end of the resistor R1, one end of the inductor L1, and a cathode of the diode D1.
  • the other end of the resistor R1 is grounded, the other end of the inductor L1 is connected to one end of the capacitor C1, the other end of the capacitor C1 is connected to the cathode of the diode D1, and is connected to one end of the resistor R2 and the capacitor C2.
  • resistor R2 is connected to GP02, which is a digital level whose state is high or low depending on the need.
  • the other end of the capacitor C2 is connected to the pin 2 of the low noise amplifier;
  • the second matching circuit includes an inductor L2, L3, and a capacitor C5, wherein one end of the inductor L2 is connected to one end of the capacitor C5 and the inductor L3.
  • the other end is connected to the pin 5 of the low noise amplifier;
  • the other end of the capacitor C5 is coupled to the radio circuit;
  • the other end of the inductor L3 is connected to other peripheral components of the amplifiers such as resistors R4, R3, capacitors C3, C4.
  • the antenna is generally disposed around the inside of the casing.

Description

说明书 用于便携式产品的 FM广播接收电路
#細或
[1] 本实用新型涉及广播接收电路, 更具体地说, 涉及一种用于便携式产品的 FM 广播接收电路。
[2] 当前随着技术的发展和终端客人的需求, FM收音广播接收系统已经越来越普 遍的使用于各类便携式产品上面, 如手机, 数码相机、 数码相框等等。 从目前 的市场上看, 大多这类产品都还停留在使用耳塞或者拉杆天线作为 FM收音广播 系统天线的阶段。 这种作法的优点是整机的接收性能比较好。 但是却也有耳塞 携带不方便, 使用麻烦等缺点。 如何在这些产品上抛开耳塞接收 FM广播功能, 让使用者用得方便简单成为了一个课题。
有部分产品作出内置天线的设计, 其设计的结构一般为: 内置天线 +匹配电路 + 调谐器的模式, 收音效果普遍不够理想, 体现为灵敏度低, 方向性强, 受人体 影响大, 远远低于同类产品使用耳塞等外置天线达到的性能。 也有一些公司从 收音机 IC的角度着手, 针对内置天线开发出相应的接收 IC, 能够一定程度的提 高接收性能, 但是还是比使用耳塞做天线差的较多, 另外方向性强以及容易受 人体干扰的问题还是存在, 满足不了顾客的要求。 内置天线方案性能问题大大 阻碍了其在便携式产品使用推广。
應 靈
[3] 本实用新型要解决的技术问题在于, 针对现有技术的上述便携式产品用耳塞天 线的不便性, 以及现在内置天线方案性能不高等缺陷, 提供一种用于便携式产 品的 FM广播接收电路结构。
[4] 本实用新型解决其技术问题所釆用的技术方案是: 构造一种用于便携式产品的
FM广播接收电路, 所述便携式产品包括壳体, 在所述壳体内设置有顺次电连接 的天线、 低噪音放大电路和收音机电路; 其中, 所述天线的 Q值为 1~10之间, 并 且低噪音放大电路中包含动态匹配电路。 [5] 在本实用新型所述的用于便携式产品的 FM广播接收电路中, 所述天线的 Q值为 小于 10的某个数值如 2、 3、 4、 5、 6、 7、 8或 9。
[6] 在本实用新型所述的用于便携式产品的 FM广播接收电路中, 所述低噪音放大 电路包括第一动态匹配电路、 第二匹配电路和低噪音放大器; 其中, 所述天线 、 第一动态匹配电路、 低噪音放大器、 第二匹配电路和收音机电路顺次电连接
[7] 在本实用新型所述的用于便携式产品的 FM广播接收电路中, 所述第一动态匹 配电路包括电容 Cl、 C2, 电感 Ll, 电阻 Rl、 R2, 二极管 Dl, 其中, 电阻 R1的 一端, 电感 L1的一端, 以及二极管 D1的阴极分别与天线连接, 电阻 R1的另一端 接地, 电感 L1的另一端与电容 C1的一端连接, 电容 C1的另一端与二极管 D1的阳 极连接, 并且分别与电阻 R2的一端及电容 C2的一端连接; 电阻 R2的另一端接数 字电平, 其状态根据需要为高或者低电平。 电容 C2的另一端与低噪音放大器的 引脚 2连接;
[8] 在本实用新型所述的用于便携式产品的 FM广播接收电路中, 所述第二匹配电 路包括电感 L2、 L3, 电容 C5, 其中, 电感 L2的一端分别与电容 C5的一端、 电感 L3的一端连接, 电感 L2的另一端与低噪音放大器的引脚 5连接; 电容 C5的另一端 耦合到收音机电路; 电感 L3的另一端与外围电路相连接。
[9] 在本实用新型所述的用于便携式产品的 FM广播接收电路中, 所述收音机电路 包括顺次电连接的高频放大器、 混频器、 中频放大器、 解调器和功率放大器。
[10] 在本实用新型所述的用于便携式产品的 FM广播接收电路中, 所述天线设置在 所述壳体内侧的四周。
[11] 实施本实用新型的用于便携式产品的 FM广播接收电路, 具有以下有益效果: 通过选择了高增益、 低 Q值的宽带内置天线, 再则在将天线接收的广播信号发送 到收音机电路之前, 先经过低噪音放大器进行放大, 把天线收到的微弱信号加 以放大, 然后再发送到收音机电路, 实现收音机电路外的第一级放大和收音机 电路内的第二级放大, 从而提高整体 FM接收灵敏度; 并且由于天线釆用的是低 Q值的天线, 整体带宽很宽, 加上后端带宽拓宽电路以满足 FM广播收音带宽较 宽的特点, 同吋解决接收性能易受人体影响的问题。 國删
[12] 下面将结合附图及实施例对本实用新型作进一步说明, 附图中:
[13] 图 1是本实用新型用于便携式产品的 FM广播接收电路的原理框图;
[14] 图 2是图 1所示的低噪音放大电路的一实施例的电路原理图。
[15] 传统的便携式产品, FM收音广播一般用耳塞或者一段外置的较长导体作为天 线。 使用很不方便。 部分把天线内置到胶壳内部, 但是接收效果会极度变差。 因此本实用新型的技术方案是针对 FM广播收音接收电路的接收性能进行优化, 使得便携式产品在不降低广播接收性能的前提下, 使用内置天线。 如图 1所示, 本实用新型的发明点在于在便携式产品的壳体内设置有顺次电连接的天线、 低 噪音放大电路和收音机电路; 其中, 所述天线的 Q值为 1~10之间。
[16] 天线的带宽与它的品质因数 (即 Q值) 有关。 一般来说, Q值越高, 天线的带 宽越窄, 即 Q值大的天线在接收信号吋, 其响应曲线较为尖锐, 而 Q值小的天线 (例如 Q10) 在接收信号吋, 其响应曲线较为平坦, 涵盖的带宽越宽, 从而可以 FM广播频段较宽的特性相匹配, 同吋受人体影响较小。 在本实用新型中, 将品 质因数 Q取为 10吋, 使得在内置天线进行收音机的收听吋, 有较好的带通特性, 同吋带宽也比较大。 我们所指天线的 Q值品质因数测量方法如下: 将天线当成一 个电感的形式, 放入 LCR仪测试其串联模式下的 Q值。 低噪音放大电路用于将接 收自天线的信号放大, 以便于后级的电路处理。 由于来自天线的信号一般都非 常微弱, 低噪音放大电路一般情况下均位于非常靠近天线的部位, 以减小信号 通过传输线的损耗。 正是由于低噪音放大器位于整个接收机紧邻天线的最先一 级, 它直接影响整个接收机接受信号的质量。 为了确保天线接收的信号能够在 接收机的最后一级被正确的恢复, 因此, 本实用新型的第一级放大在放大信号 的同吋产生尽可能低的噪音以及失真。
[17] 具体地, 可使用直径为 0.2mm的漆包线缠绕于氧化铁、 氧化镍、 氧化铜和氧化 锌材料按比例混合制造的磁芯 100匝, 作为本实用新型的 FM接收天线, 其实现接 收效率高, 低 Q值, 宽带宽的目的。 在设计中, 天线的 Q值为小于 10的某个数值 如 2、 3、 4、 5、 6、 7、 8或 9。 在一优选实施例中, Q值大约为 4。 [18] 本实用新型的 FM广播接收电路作为与便携式产品的结合部件, 调频收音机部 分直接接受调频发射机的主波段, 然后通过收音机电路外的第一级放大和收音 机电路内的第二级放大, 以及功放等, 输出到扬声器上, 调频收音机部分与便 携式产品间的联系, 是利用便携式产品的主控制器进行处理。
[19] 如图 1所示的实施例中, 该低噪音放大电路包括第一动态匹配电路、 第二匹配 电路和低噪音放大器; 其中, 天线、 第一动态匹配电路、 低噪音放大器、 第二 匹配电路和收音机电路顺次电连接。 收音机电路包括顺次电连接的高频放大器 、 混频器、 中频放大器、 解调器和功率放大器。 如图 2所示的低噪音放大电路中 , 第一动态匹配电路包括电容 Cl、 C2, 电感 Ll, 电阻 Rl、 R2, 二极管 Dl, 其 中, 电阻 R1的一端, 电感 L1的一端, 二极管 D1的阴极分别与天线连接, 电阻 R1 的另一端接地, 电感 L1的另一端连接电容 C1的一端, 电容 C1的另一端与二极管 的 D1阴极连接, 并且与电阻 R2及电容 C2的一端连接。
电阻 R2的另一端连接 GP02, 为数字电平, 其状态根据需要为高或者低电平。 电 容 C2的另一端与低噪音放大器的引脚 2连接; 第二匹配电路包括电感 L2、 L3, 电 容 C5, 其中, 电感 L2的一端与电容 C5、 电感 L3的一端连接。 另一端与低噪音放 大器的引脚 5连接; 电容 C5的另一端耦合到收音机电路; 电感 L3的另一端与电阻 R4、 R3、 电容 C3、 C4等放大器的其他外围元件连接。 另外, 为了获得较好的接 收效果, 天线一般设置在所述壳体内侧的四周。
[20] 本实用新型是通过几个具体实施例进行说明的, 本领域技术人员应当明白, 在 不脱离本实用新型范围的情况下, 还可以对本实用新型进行各种变换及等同替 代。 另外, 针对特定情形或具体情况, 可以对本实用新型做各种修改, 而不脱 离本实用新型的范围。 因此, 本实用新型不局限于所公开的具体实施例, 而应 当包括落入本实用新型权利要求范围内的全部实施方式。

Claims

权利要求书
[1] 1、 一种用于便携式产品的 FM广播接收电路, 所述便携式产品包括壳体, 其特征在于, 在所述壳体内设置有顺次电连接的天线、 低噪音放大电路和 收音机电路; 其中, 所述天线的 Q值为 1~10之间。
[2] 2、 根据权利要求 1所述的用于便携式产品的 FM广播接收电路, 其特征在于
, 所述天线的 Q值为 2、 3、 4、 5、 6、 7、 8或 9。
[3] 3、 根据权利要求 1或 2所述的用于便携式产品的 FM广播接收电路, 其特征 在于, 所述低噪音放大电路包括第一动态匹配电路、 第二匹配电路和低噪 音放大器; 其中, 所述天线、 第一动态匹配电路、 低噪音放大器、 第二匹 配电路和收音机电路顺次电连接。
[4] 4、 根据权利要求 3所述的用于便携式产品的 FM广播接收电路, 其特征在于 所述第一动态匹配电路包括电容 Cl、 C2, 电感 Ll, 电阻 Rl、 R2, 二极管 D
1, 其中,
电阻 R1的一端, 电感 L1的一端, 以及二极管 D1的阴极分别与天线连接, 电 阻 R1的另一端接地, 电感 L1的另一端与电容 C1的一端连接, 电容 C1的另 一端与二极管 D1的阳极连接, 并且分别与电阻 R2的一端及电容 C2的一端连 接;
电阻 R2的另一端接数字电平;
电容 C2的另一端与低噪音放大器的引脚 2连接。
[5] 5、 根据权利要求 3所述的用于便携式产品的 FM广播接收电路, 其特征在于
, 所述第二匹配电路包括电感 L2、 L3, 电容 C5, 其中,
电感 L2的一端分别与电容 C5的一端、 电感 L3的一端连接, 电感 L2的另一端 与低噪音放大器的引脚 5连接;
电容 C5的另一端耦合到收音机电路;
电感 L3的另一端与外围电路相连接。
[6] 6、 根据权利要求 3所述的用于便携式产品的 FM广播接收电路, 其特征在于
, 所述收音机电路包括顺次电连接的高频放大器、 混频器、 中频放大器, 解调器和功率放大器。
[7] 7、 根据权利要求 3所述的用于便携式产品的 FM广播接收电路, 其特征在于
, 所述天线设置在所述壳体内侧的四周。
PCT/CN2008/073725 2008-12-25 2008-12-25 用于便携式产品的fm广播接收电路 WO2010072031A1 (zh)

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