WO2013075542A1 - 发射滤波器及移动终端 - Google Patents

发射滤波器及移动终端 Download PDF

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Publication number
WO2013075542A1
WO2013075542A1 PCT/CN2012/081570 CN2012081570W WO2013075542A1 WO 2013075542 A1 WO2013075542 A1 WO 2013075542A1 CN 2012081570 W CN2012081570 W CN 2012081570W WO 2013075542 A1 WO2013075542 A1 WO 2013075542A1
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Prior art keywords
filter
band
frequency
capacitor
group
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PCT/CN2012/081570
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English (en)
French (fr)
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白剑
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惠州Tcl移动通信有限公司
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Publication of WO2013075542A1 publication Critical patent/WO2013075542A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details 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
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details 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
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line

Definitions

  • the present invention relates to the field of communications, and in particular to a transmitting filter and a mobile terminal.
  • Today's mobile terminals typically employ a surface acoustic wave filter as a transmit filter.
  • the surface acoustic wave filter evaporates a metal film on a material substrate having a piezoelectric effect, and then forms a pair of interdigitated electrodes at both ends by photolithography.
  • the transmitting transducer When a signal voltage is applied to the transmitting transducer, an electric field is formed between the input interdigital electrodes to cause mechanical vibration (ie, ultrasonic waves) of the piezoelectric material to propagate to the left and right sides in the form of ultrasonic waves, and the energy to the edge side is Absorbed by sound absorbing materials.
  • the mechanical vibration is reconverted into an electrical signal by the receiving transducer and output by the interdigital electrode. Therefore, after adding the surface acoustic wave filter as the transmission filter, the mobile terminal can perform frequency selection, filter spurious interference, and improve communication quality.
  • the surface acoustic wave filter has a very large insertion loss, and the usual insertion loss can be between 3 dB and 4 dB, which is unacceptable for mobile terminals requiring low power consumption.
  • the technical problem to be solved by the present invention is to provide a transmitting filter and a mobile terminal, which can effectively reduce the power consumption of the mobile terminal.
  • a technical solution adopted by the present invention is to provide a mobile terminal, including: a wireless transceiver, a transmission filter, a power amplifier, a frequency division duplexer, an antenna, and a first matching network; a transceiver for receiving or transmitting a signal, one end is connected to an input end of the transmitting filter, and the other end is connected to a receiving end of the frequency division duplexer; a transmitting filter, the transmitting filter is low pass a filter for selecting a transmission frequency, the output being connected to an input of the power amplifier, wherein the low pass filter is a capacitive inductive filter; the power amplifier, the output and the transmission of the frequency division duplexer
  • the terminal is connected to the frequency division duplexer, and includes a receiving path and a transmitting path.
  • the transmitting path uses a low pass filter or a band limiting filter, and the external terminal is connected to the antenna, wherein the low pass filter is a capacitor inductor a first matching network device for implementing impedance matching between the power amplifier and the frequency division duplexer, one end connected to the output end of the power amplifier, and the other Transmitter connected to the frequency division duplexer.
  • the low pass filter is a capacitor inductor a first matching network device for implementing impedance matching between the power amplifier and the frequency division duplexer, one end connected to the output end of the power amplifier, and the other Transmitter connected to the frequency division duplexer.
  • the capacitive inductive filter includes a plurality of sets of LC ⁇ type filter circuits
  • the LC ⁇ type filter circuit includes a first capacitor, an inductor, and a second capacitor, wherein the first capacitor is grounded at one end, and the other end is connected to the inductor.
  • the other end of the inductor is connected to one end of the second capacitor, the other end of the second capacitor is grounded, and the first group of LC ⁇ type filter circuits and the second group of LC ⁇ type filter circuits share the first group of LC type filter circuits.
  • the second capacitor, the second group of LC ⁇ type filter circuits and the third group of LC ⁇ type filter circuits share the second capacitor of the second group of LC ⁇ type filter circuits, and so on.
  • the terminal further includes: a second matching network device, configured to implement impedance matching between the frequency division duplexer and the antenna, one end is connected to the external end of the frequency division duplexer, and the other end is connected to the antenna.
  • a second matching network device configured to implement impedance matching between the frequency division duplexer and the antenna, one end is connected to the external end of the frequency division duplexer, and the other end is connected to the antenna.
  • the maximum output power of the wireless transceiver in the frequency bands 1, 4, 5, and 8 is 4 dBm, the minimum output power is -76 dBm, the noise in the receiving frequency band is -155 dBm/Hz, and the maximum output power in the frequency band 2 is 4.5 dBm.
  • the minimum output power is -76dBm, the receiving band noise is -155dBm/Hz; the insertion filter has an insertion loss of 0.5dB in each frequency band, and the attenuation in the receiving frequency band of bands 1, 4, 5, and 8 is 13.5dB.
  • the receiving band of band 2 is attenuated by 15 decibels; the amplification gain of the power amplifier in each band is 24.5 decibels, the amplification gain in the receiving band is 23.5 decibels, and the total output receiving band noise in bands 1 and 4 is - 146.5dBm/Hz, the total output receiving band noise in the bands 2, 5, 8 is -145dBm/Hz; the insertion loss of the frequency division duplexer in the bands 1 and 4 is 0.5 decibels, in the bands 2, 5, 8 The insertion loss is 1 dB, the noise attenuation in the receiving band is 25 dB in each frequency band, and the noise in the output receiving band is -173.5 dBm/Hz.
  • another technical solution adopted by the present invention is to provide a transmitting filter, wherein the transmitting filter is a low pass filter.
  • the low pass filter is a capacitive inductive filter.
  • the capacitive inductive filter includes a plurality of sets of LC ⁇ type filter circuits
  • the LC ⁇ type filter circuit includes a first capacitor, an inductor, and a second capacitor, wherein the first capacitor is grounded at one end, and the other end is connected to the inductor.
  • the other end of the inductor is connected to one end of the second capacitor, the other end of the second capacitor is grounded, and the first group of LC ⁇ type filter circuits and the second group of LC ⁇ type filter circuits share the first group of LC type filter circuits.
  • the second capacitor, the second group of LC ⁇ type filter circuits and the third group of LC ⁇ type filter circuits share the second capacitor of the second group of LC ⁇ type filter circuits, and so on.
  • a mobile terminal which includes: a wireless transceiver, a transmission filter, a power amplifier, a frequency division duplexer and an antenna; and a wireless transceiver.
  • Receiving or transmitting a signal one end is connected to the input end of the transmitting filter, and the other end is connected to the receiving end of the frequency division duplexer; a transmitting filter, the transmitting filter is a low pass filter, Selecting a transmission frequency, the output end is connected to the input end of the power amplifier; the power amplifier, the output end is connected to the transmitting end of the frequency division duplexer; the frequency division duplexer includes a receiving path and a transmitting path, and the transmitting The path uses a low pass filter or a band limit filter, and the external terminal is connected to the antenna.
  • the low pass filter is a capacitive inductive filter.
  • the capacitive inductive filter includes a plurality of sets of LC ⁇ type filter circuits
  • the LC ⁇ type filter circuit includes a first capacitor, an inductor, and a second capacitor, wherein the first capacitor is grounded at one end, and the other end is connected to the inductor.
  • the other end of the inductor is connected to one end of the second capacitor, the other end of the second capacitor is grounded, and the first group of LC ⁇ type filter circuits and the second group of LC ⁇ type filter circuits share the first group of LC type filter circuits.
  • the second capacitor, the second group of LC ⁇ type filter circuits and the third group of LC ⁇ type filter circuits share the second capacitor of the second group of LC ⁇ type filter circuits, and so on.
  • the terminal further includes: a first matching network device, configured to implement impedance matching between the power amplifier and the frequency division duplexer, one end is connected to the output end of the power amplifier, and the other end is connected to the frequency division duplexer.
  • the transmitter is connected.
  • the terminal further includes: a second matching network device, configured to implement impedance matching between the frequency division duplexer and the antenna, one end is connected to the external end of the frequency division duplexer, and the other end is connected to the antenna.
  • a second matching network device configured to implement impedance matching between the frequency division duplexer and the antenna, one end is connected to the external end of the frequency division duplexer, and the other end is connected to the antenna.
  • the maximum output power of the wireless transceiver in the frequency bands 1, 4, 5, and 8 is 4 dBm, the minimum output power is -76 dBm, the noise in the receiving frequency band is -155 dBm/Hz, and the maximum output power in the frequency band 2 is 4.5 dBm.
  • the minimum output power is -76dBm, the receiving band noise is -155dBm/Hz; the insertion filter has an insertion loss of 0.5dB in each frequency band, and the attenuation in the receiving frequency band of bands 1, 4, 5, and 8 is 13.5dB.
  • the receiving band of band 2 is attenuated by 15 decibels; the amplification gain of the power amplifier in each band is 24.5 decibels, the amplification gain in the receiving band is 23.5 decibels, and the total output receiving band noise in bands 1 and 4 is - 146.5dBm/Hz, the total output receiving band noise in the bands 2, 5, 8 is -145dBm/Hz; the insertion loss of the frequency division duplexer in the bands 1 and 4 is 0.5 decibels, in the bands 2, 5, 8 The insertion loss is 1 dB, the noise attenuation in the receiving band is 25 dB in each frequency band, and the noise in the output receiving band is -173.5 dBm/Hz.
  • the invention has the beneficial effects that the prior art uses a surface acoustic wave filter as a transmission filter with a very large insertion loss, and the present invention provides a low-pass filter using low insertion loss as a transmission filter, and According to the receiving band noise level of the wireless transceiver and the suppression degree of the receiving band, the parameters of each component are re-determined, and the suppression of the receiving noise is ensured at the same time while ensuring low insertion loss.
  • FIG. 1 is a circuit diagram of an embodiment of a transmit filter of the present invention
  • FIG. 3 is a schematic structural diagram of an embodiment of a mobile terminal according to the present invention.
  • FIG. 4 is a schematic structural diagram of another embodiment of a mobile terminal according to the present invention.
  • a transmitting filter of the present invention which is a capacitive inductive filter, is one of low pass filters.
  • the LC ⁇ type filter circuit includes a first capacitor, an inductor and a second capacitor.
  • the first capacitor has one end grounded, the other end is connected to one end of the inductor, the other end of the inductor is connected to one end of the second capacitor, and the other end of the second capacitor is grounded. .
  • the capacitor inductor filter comprises a plurality of sets of LC ⁇ type filter circuits, and the first group of LC ⁇ type filter circuits and the second group of LC ⁇ type filter circuits share the second capacitor of the first group of LC ⁇ type filter circuits, and the second group of LC ⁇
  • the type filter circuit shares the second capacitance of the second group of LC type filter circuits with the third group of LC type filter circuits, and so on.
  • the characteristic curve of the filter is also different.
  • the first capacitor of the first group of LC ⁇ type filter circuits has a value of 4.2 picofarads
  • the value of the inductor is 4.1 nanohenries
  • the value of the second capacitor is 4.3 picofarads.
  • the inductance of the second group of LC ⁇ type filter circuits is 6.2 nanohenry, and the value of the second capacitor is 4.3 picofarads.
  • the inductance of the LC filter of the third group is 6.2 nanohenry and the value of the second capacitor is 4.3 picofarads.
  • the inductance of the LC filter of the fourth group is 5.6 nanohenries and the value of the second capacitor is 4.3 picofarads.
  • the inductance of the LC filter of the fifth group has a value of 5.6 nanohenry and the value of the second capacitor is 4.3 picofarads.
  • the inductance of the LC filter of the sixth group is 5.1 nanohenry and the value of the second capacitor is 3.3 picofarads.
  • the connection between the first capacitor and the inductor of the first group of LC-type filter circuits is taken as the input, and the connection between the second capacitor and the inductor of the sixth group of LC-type filter circuits is used as an output, and the capacitor inductance filter can be obtained by simulation technology.
  • the insertion loss characteristic curve shows that the maximum insertion loss of the capacitor and inductor filter is 0.3 dB, which is much lower than the insertion loss of the surface acoustic wave filter.
  • the present invention provides a low-pass filter using a low insertion loss as a transmission filter, which effectively reduces insertion loss.
  • the present invention further provides a mobile terminal, as shown in FIG. 3, comprising: a wireless transceiver 110, a transmit filter 120, a power amplifier 130, a first matching network 140, a frequency division duplexer 150, and a second matching network.
  • a wireless transceiver 110 for transmitting signals
  • a transmit filter 120 for transmitting signals
  • a power amplifier 130 for amplifying signals
  • a first matching network 140 for converting signals to base station.
  • a frequency division duplexer 150 for transmits signals
  • the device 160 and the antenna 170 comprising: a wireless transceiver 110, a transmit filter 120, a power amplifier 130, a first matching network 140, a frequency division duplexer 150, and a second matching network.
  • the wireless transceiver 110 is configured to receive or transmit a signal, one end of which is coupled to the input of the transmit filter 120 and the other end to the receive end of the frequency division duplexer 150.
  • the output of the transmit filter 120 is coupled to the input of the power amplifier 130.
  • the transmit signal can be limited to a particular frequency and the interfering signal at the non-operating frequency can be filtered.
  • a capacitive inductive filter which is one of the low-pass filters, as shown in Figure 1.
  • the LC ⁇ type filter circuit includes a first capacitor, an inductor and a second capacitor.
  • the first capacitor has one end grounded, the other end is connected to one end of the inductor, the other end of the inductor is connected to one end of the second capacitor, and the other end of the second capacitor is grounded. .
  • the capacitor inductor filter comprises a plurality of sets of LC ⁇ type filter circuits, and the first group of LC ⁇ type filter circuits and the second group of LC ⁇ type filter circuits share the second capacitor of the first group of LC ⁇ type filter circuits, and the second group of LC ⁇
  • the type filter circuit shares the second capacitance of the second group of LC type filter circuits with the third group of LC type filter circuits, and so on.
  • the characteristic curve of the filter is also different.
  • the first capacitor of the first group of LC ⁇ type filter circuits has a value of 4.2 picofarads
  • the value of the inductor is 4.1 nanohenries
  • the value of the second capacitor is 4.3 picofarads.
  • the inductance of the second group of LC ⁇ type filter circuits is 6.2 nanohenry, and the value of the second capacitor is 4.3 picofarads.
  • the inductance of the LC filter of the third group is 6.2 nanohenry and the value of the second capacitor is 4.3 picofarads.
  • the inductance of the LC filter of the fourth group is 5.6 nanohenries and the value of the second capacitor is 4.3 picofarads.
  • the inductance of the LC filter of the fifth group has a value of 5.6 nanohenry and the value of the second capacitor is 4.3 picofarads.
  • the inductance of the LC filter of the sixth group is 5.1 nanohenry and the value of the second capacitor is 3.3 picofarads.
  • the connection between the first capacitor and the inductor of the first group of LC-type filter circuits is taken as the input, and the connection between the second capacitor and the inductor of the sixth group of LC-type filter circuits is used as an output, and the capacitor inductance filter can be obtained by simulation technology.
  • the insertion loss characteristic curve shows that the maximum insertion loss of the capacitor and inductor filter is 0.3 dB, which is much lower than the insertion loss of the surface acoustic wave filter.
  • the output of the power amplifier 130 is coupled to one end of the first matching network 140. After the transmitted signal is amplified by the power amplifier 130, sufficient power is obtained to be transmitted through the antenna 170 into the space to be received by the next receiving end, such as the base station and the mobile terminal as much as possible.
  • the first matching network 140 is used to implement impedance matching between the power amplifier 130 and the frequency division duplexer 150, one end of which is connected to the output of the power amplifier 130 and the other end of which is connected to the transmitting end of the frequency division duplexer 150.
  • the frequency division duplexer 150 includes a receiving path and a transmitting path. And the transmission path uses a low-pass filter or a band-limited filter with low insertion loss instead of a high insertion loss band-stop filter.
  • the second matching network unit 160 is configured to implement impedance matching between the wireless transceiver 110 and the antenna 170, one end of which is connected to the output of the frequency division duplexer 150, and the other end of which is connected to the antenna 170.
  • the antenna 170 is a printed antenna printed on the circuit board, and both the received signal and the transmitted signal are transmitted and received through the antenna 170.
  • a strip antenna made of metal or the like may be used, which is not limited in the present invention.
  • the mobile terminal of the present invention can be applied to various types of mobile communication technologies such as CDMA, WCDMA, GSM, and the like.
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GSM Global System for Mobile communications
  • WCDMA has nine working frequency bands: Working frequency Frequency (megahertz) Working country Band 1 2,100 Band 2 1,900 Band 3 1,800 Band 4 2,100/1,700 Band 5 850 United States Band 6 850 Japan Band 7 2,500 Band 8 900 Band 9 1,700 Japan
  • the mobile terminal provided by the present invention is freely selectable to operate in the frequency bands 1, 2, 4, 5, and 8. Therefore, the mobile terminal is provided with multiple branches, and each branch has a transmit filter 220, The power amplifier 230, the first matching network 240, the frequency division duplexer 250, and the second matching network 260.
  • Each of the transmit filters 220 has a different selected operating frequency and can be set to operate in the frequency bands 1, 2, 4, 5, 8, respectively.
  • the signal selected by the transmit filter 220 is amplified and transmitted by the power amplifier 230 to the first matching network 240, and then transmitted to the second matching network 260 via the transmission path of the frequency division duplexer 250, and then passes through the multi-way working switch. 270, transmitted to antenna 280. If the antenna 280 receives the received signal, it is transmitted to the second matching network 260 via the multiplexed work switch 270 and then transmitted to the wireless transceiver 210 through the receive path of the frequency division duplexer 250.
  • the mobile terminal uses the low-pass filter to reduce the insertion loss, the suppression of the reception band is deteriorated due to the nature of the low-pass filter itself, and the power amplifier 230 and the wireless transceiver 210 are added to ensure the quality of the communication. Noise suppression requirements. Adding noise suppression to power amplifier 230 and wireless transceiver 210 is difficult to achieve under the prior art. Thus, it is necessary to reallocate the parameters of the various parts of the mobile terminal such that the degree of suppression of the received frequency band operates within an acceptable range.
  • the receiving band noise level of the receiving path of the mobile terminal is -173 dBm/Hz, and the maximum suppression degree of the receiving band is 20 dB.
  • the maximum output power of the wireless transceiver 210 in the frequency bands 1, 4, 5, 8 is 4 dBm
  • the minimum output power is -76 dBm
  • the noise in the receiving band is -155 dBm/Hz
  • the maximum in the frequency band 2 The output power is 4.5dBm
  • the minimum output power is -76dBm
  • the receiving band noise is -155dBm/Hz.
  • the transmit filter 220 has an insertion loss of 0.5 dB in each frequency band, a 13.5 dB attenuation in the receive band of the bands 1, 4, 5, and 8, and a decimation of 15 dB in the receive band of the band 2.
  • the parameters of the power amplifier 230 can be determined.
  • the amplification gain of the power amplifier 230 in each frequency band is 24.5 decibels
  • the amplification gain in the receiving band is 23.5 decibels
  • the total output receiving band noise in the bands 1 and 4 is -146.5 dBm/Hz, in the bands 2, 5,
  • the total output receive band noise of 8 is -145dBm/Hz.
  • the frequency division duplexer 250 has an insertion loss of 0.5 dB in the bands 1 and 4, an insertion loss of 1 dB in the bands 2, 5, and 8, and a noise attenuation of 25 dB in the receiving band in each frequency band, and the output receiving band
  • the noise is -173.5dBm/Hz.
  • the insertion loss of the multi-way switch 270 is 0.8 dB at a high frequency and 0.5 dB at a low frequency.
  • the insertion loss of the transmission line is: high frequency 0.7 decibels, low frequency 0.5 decibels.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

本发明公开了发射滤波器及移动终端。移动终端包括：无线收发机、发射滤波器、功率放大器、频分双工器及天线；无线收发机，用于接收或发送信号，一端与发射滤波器的输入端连接，另一端与频分双工器的接收端连接；发射滤波器，发射滤波器是低通滤波器，用于选择发射频率，输出端与功率放大器的输入端相连；功率放大器，输出端与频分双工器的发射端连接；频分双工器，包括接收通路及发射通路，发射通路采用低通滤波器或带限滤波器，外接端与天线相连。通过上述方式，本发明能够在保证低插损的情况下同时保证对接收噪声的抑制度。

Description

发射滤波器及移动终端
【技术领域】
本发明涉及通讯领域，特别是涉及一种发射滤波器及移动终端。
【背景技术】
现今的移动终端通常采用声表面波滤波器作为发射滤波器。声表面波滤波器是在一块具有压电效应的材料基片上蒸发一层金属膜，然后经光刻，在两端各形成一对叉指形电极组成。
当在发射换能器上加上信号电压后，就在输入叉指电极间形成一个电场使压电材料发生机械振动（即超声波）以超声波的形式向左右两边传播，向边缘一侧的能量由吸声材料所吸收。在接收端，由接收换能器将机械振动再转化为电信号，并由叉指形电极输出。因而，移动终端在加入声表面波滤波器作为发射滤波器后，就能够进行频率选择，过滤杂散干扰，提高通讯的品质。
但是，声表面波滤波器的插入损耗非常大，通常的插入损耗可达3分贝~4分贝之间，对于要求低功耗的移动终端来说，是难以接受的。
【发明内容】
本发明主要解决的技术问题是提供一种发射滤波器及移动终端，能够有效降低移动终端的功耗。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种移动终端，其中，包括：无线收发机、发射滤波器、功率放大器、频分双工器、天线及第一匹配网络器；无线收发机，用于接收或发送信号，一端与所述发射滤波器的输入端连接，另一端与所述频分双工器的接收端连接；发射滤波器，所述发射滤波器是低通滤波器，用于选择发射频率，输出端与所述功率放大器的输入端相连，其中，所述低通滤波器是电容电感滤波器；功率放大器，输出端与所述频分双工器的发射端连接；频分双工器，包括接收通路及发射通路，所述发射通路采用低通滤波器或带限滤波器，外接端与所述天线相连，其中，所述低通滤波器是电容电感滤波器；第一匹配网络器，用于实现所述功率放大器与频分双工器之间的阻抗匹配，一端与功率放大器的输出端连接，另一端与频分双工器的发射端连接。
其中，所述电容电感滤波器包括多组LC∏型滤波电路，所述LC∏型滤波电路包括第一电容、电感及第二电容，所述第一电容一端接地端，另一端与电感相连，电感的另一端与第二电容的一端相连，第二电容的另一端接地端，且第一组LC∏型滤波电路与第二组LC∏型滤波电路共用第一组LC∏型滤波电路的第二电容，第二组LC∏型滤波电路与第三组LC∏型滤波电路共用第二组LC∏型滤波电路的第二电容，依次类推。
其中，所述终端还包括：第二匹配网络器，用于实现所述频分双工器与天线之间的阻抗匹配，一端与频分双工器的外接端连接，另一端与天线连接。
其中，所述无线收发机在频段1、4、5、8的最大输出功率为4dBm，最小输出功率为-76dBm，接收频段噪声为-155dBm/Hz，在频段2的最大输出功率为4.5dBm，最小输出功率为-76dBm，接收频段噪声为-155dBm/Hz；所述发射滤波器在各个频段的插入损耗均为0.5分贝，在频段1、4、5、8的接收频段衰减为13.5分贝，在频段2的接收频段衰减为15分贝；所述功率放大器在各个频段的发射频段放大增益均为24.5分贝，接收带内放大增益均为23.5分贝，在频段1、4的总输出接收频段噪声为-146.5dBm/Hz，在频段2、5、8的总输出接收频段噪声为-145dBm/Hz；所述频分双工器在频段1、4的插入损耗为0.5分贝，在频段2、5、8的插入损耗为1分贝，在各个频段的对接收频段的噪声衰减均为25分贝，输出接收频段噪声为-173.5dBm/Hz。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种发射滤波器，其中，所述发射滤波器是低通滤波器。
其中，所述低通滤波器是电容电感滤波器。
其中，所述电容电感滤波器包括多组LC∏型滤波电路，所述LC∏型滤波电路包括第一电容、电感及第二电容，所述第一电容一端接地端，另一端与电感相连，电感的另一端与第二电容的一端相连，第二电容的另一端接地端，且第一组LC∏型滤波电路与第二组LC∏型滤波电路共用第一组LC∏型滤波电路的第二电容，第二组LC∏型滤波电路与第三组LC∏型滤波电路共用第二组LC∏型滤波电路的第二电容，依次类推。
为解决上述技术问题，本发明采用的再一个技术方案是：提供一种移动终端，其中，包括：无线收发机、发射滤波器、功率放大器、频分双工器及天线；无线收发机，用于接收或发送信号，一端与所述发射滤波器的输入端连接，另一端与所述频分双工器的接收端连接；发射滤波器，所述发射滤波器是低通滤波器，用于选择发射频率，输出端与所述功率放大器的输入端相连；功率放大器，输出端与所述频分双工器的发射端连接；频分双工器，包括接收通路及发射通路，所述发射通路采用低通滤波器或带限滤波器，外接端与所述天线相连。
其中，所述低通滤波器是电容电感滤波器。
其中，所述电容电感滤波器包括多组LC∏型滤波电路，所述LC∏型滤波电路包括第一电容、电感及第二电容，所述第一电容一端接地端，另一端与电感相连，电感的另一端与第二电容的一端相连，第二电容的另一端接地端，且第一组LC∏型滤波电路与第二组LC∏型滤波电路共用第一组LC∏型滤波电路的第二电容，第二组LC∏型滤波电路与第三组LC∏型滤波电路共用第二组LC∏型滤波电路的第二电容，依次类推。
其中，所述终端还包括：第一匹配网络器，用于实现所述功率放大器与频分双工器之间的阻抗匹配，一端与功率放大器的输出端连接，另一端与频分双工器的发射端连接。
其中，所述终端还包括：第二匹配网络器，用于实现所述频分双工器与天线之间的阻抗匹配，一端与频分双工器的外接端连接，另一端与天线连接。
其中，所述无线收发机在频段1、4、5、8的最大输出功率为4dBm，最小输出功率为-76dBm，接收频段噪声为-155dBm/Hz，在频段2的最大输出功率为4.5dBm，最小输出功率为-76dBm，接收频段噪声为-155dBm/Hz；所述发射滤波器在各个频段的插入损耗均为0.5分贝，在频段1、4、5、8的接收频段衰减为13.5分贝，在频段2的接收频段衰减为15分贝；所述功率放大器在各个频段的发射频段放大增益均为24.5分贝，接收带内放大增益均为23.5分贝，在频段1、4的总输出接收频段噪声为-146.5dBm/Hz，在频段2、5、8的总输出接收频段噪声为-145dBm/Hz；所述频分双工器在频段1、4的插入损耗为0.5分贝，在频段2、5、8的插入损耗为1分贝，在各个频段的对接收频段的噪声衰减均为25分贝，输出接收频段噪声为-173.5dBm/Hz。
本发明的有益效果是：区别于现有技术采用声表面波滤波器作为发射滤波器的插入损耗非常大的情况，本发明提供一种采用低插入损耗的低通滤波器作为发射滤波器，并根据无线收发机的接收频段噪声水平及接收频段的抑制度重新确定了各个部件的参数，在保证低插损的情况下同时保证对接收噪声的抑制度。
【附图说明】
图1是本发明发射滤波器一实施例的电路图；
图2是本发明发射滤波器插入损耗特性曲线图；
图3本发明移动终端一实施例的结构示意图；
图4本发明移动终端另一实施例的结构示意图。
【具体实施方式】
下面结合附图和实施例对本发明进行详细说明。
如图1所示的是本发明的一种发射滤波器，这里采用的是电容电感滤波器，是低通滤波器中的一种。
LC∏型滤波电路包括第一电容、电感及第二电容，第一电容一端接地端，另一端与电感一端相连，电感的另一端与第二电容的一端相连，第二电容的另一端接地端。
电容电感滤波器包括多组LC∏型滤波电路，且第一组LC∏型滤波电路与第二组LC∏型滤波电路共用第一组LC∏型滤波电路的第二电容，第二组LC∏型滤波电路与第三组LC∏型滤波电路共用第二组LC∏型滤波电路的第二电容，依次类推。电容电感的值不同时，滤波的特性曲线也不相同。在本实施例中，第一组的LC∏型滤波电路的第一电容的值为4.2皮法，电感的值为4.1纳亨，第二电容的值为4.3皮法。第二组的LC∏型滤波电路的电感的值为6.2纳亨，第二电容的值为4.3皮法。第三组的LC∏型滤波电路的电感的值为6.2纳亨，第二电容的值为4.3皮法。第四组的LC∏型滤波电路的电感的值为5.6纳亨，第二电容的值为4.3皮法。第五组的LC∏型滤波电路的电感的值为5.6纳亨，第二电容的值为4.3皮法。第六组的LC∏型滤波电路的电感的值为5.1纳亨，第二电容的值为3.3皮法。
以第一组LC∏型滤波电路的第一电容与电感的连接端作为输入，第六组LC∏型滤波电路的第二电容与电感的连接端作为输出，通过仿真技术可以得到电容电感滤波器插入损耗特性曲线，如图2所示，可得出该电容电感滤波器插入损耗最大值为0.3分贝，远低于使用声表面波滤波器的插入损耗。
区别于现有技术采用声表面波滤波器作为发射滤波器的插入损耗非常大的情况，本发明提供一种采用低插入损耗的低通滤波器作为发射滤波器，有效地降低了插入损耗。
本发明还提供了一种移动终端，如图3所示，包括：无线收发机110、发射滤波器120、功率放大器130、第一匹配网络器140、频分双工器150、第二匹配网络器160及天线170。
无线收发机110用于接收或发送信号，一端与发射滤波器120的输入端连接，另一端与频分双工器150的接收端连接。
发射滤波器120输出端与功率放大器130的输入端相连。通过发射滤波器120的选择作用，可以使发射信号限定在特定的频率上，而且过滤非工作频率上的干扰信号。这里采用的是电容电感滤波器，是低通滤波器中的一种，如图1所示。
LC∏型滤波电路包括第一电容、电感及第二电容，第一电容一端接地端，另一端与电感一端相连，电感的另一端与第二电容的一端相连，第二电容的另一端接地端。
电容电感滤波器包括多组LC∏型滤波电路，且第一组LC∏型滤波电路与第二组LC∏型滤波电路共用第一组LC∏型滤波电路的第二电容，第二组LC∏型滤波电路与第三组LC∏型滤波电路共用第二组LC∏型滤波电路的第二电容，依次类推。电容电感的值不同时，滤波的特性曲线也不相同。在本实施例中，第一组的LC∏型滤波电路的第一电容的值为4.2皮法，电感的值为4.1纳亨，第二电容的值为4.3皮法。第二组的LC∏型滤波电路的电感的值为6.2纳亨，第二电容的值为4.3皮法。第三组的LC∏型滤波电路的电感的值为6.2纳亨，第二电容的值为4.3皮法。第四组的LC∏型滤波电路的电感的值为5.6纳亨，第二电容的值为4.3皮法。第五组的LC∏型滤波电路的电感的值为5.6纳亨，第二电容的值为4.3皮法。第六组的LC∏型滤波电路的电感的值为5.1纳亨，第二电容的值为3.3皮法。
以第一组LC∏型滤波电路的第一电容与电感的连接端作为输入，第六组LC∏型滤波电路的第二电容与电感的连接端作为输出，通过仿真技术可以得到电容电感滤波器插入损耗特性曲线，如图2所示，可得出该电容电感滤波器插入损耗最大值为0.3分贝，远低于使用声表面波滤波器的插入损耗。
功率放大器130输出端与第一匹配网络器140一端相连。发射信号经过功率放大器130的放大作用后，获得足够的功率通过天线170发送到空间中，以尽可能地被下一个接收端，如基站、移动终端所接收。
第一匹配网络器140用于实现功率放大器130与频分双工器150之间的阻抗匹配，一端与功率放大器130的输出端连接，另一端与频分双工器150的发射端连接。
频分双工器150包括接收通路及发射通路。且发射通路采用低插入损耗的低通滤波器或带限滤波器来替代高插入损耗的带阻滤波器。
第二匹配网络器160用于实现无线收发机110与天线170之间的阻抗匹配，一端与频分双工器150的输出端连接，另一端与天线170连接。
天线170为印刷天线，印刷于电路板上，接收信号及发射信号均通过天线170进行收发。在其它的实施方式中，也可以是金属制成的条形天线等，本发明不作限定。
本发明的移动终端可以适用于多种类型移动通讯技术，如CDMA、WCDMA、GSM等等。为了能更好地陈述，下面以WCDMA为例进行陈述。
按照国际约定，WCDMA有九个工作频段：
工作频段 频率（兆赫兹） 工作国家
频段 1 2,100
频段 2 1,900
频段 3 1,800
频段 4 2,100/1,700
频段 5 850 美国
频段 6 850 日本
频段 7 2,500
频段 8 900
频段 9 1,700 日本
如图4所示，本发明所提供的移动终端可自由选择工作在频段1、2、4、5、8中，因而，移动终端设置有多个分支，每个分支都有发射滤波器220、功率放大器230、第一匹配网络器240、频分双工器250，第二匹配网络器260。每个发射滤波器220的选择工作频率不同，可分别设置工作在频段1、2、4、5、8中。经过发射滤波器220选择后的信号被功率放大器230进行放大传输到第一匹配网络器240后，经频分双工器250的发射通路传输到第二匹配网络器260，然后经多路工作开关270，传输到天线280中。如果天线280接收到接收信号时，经过多路工作开关270传输到第二匹配网络器260，然后通过频分双工器250的接收通路传输到无线收发机210。
移动终端使用低通滤波器虽然能够降低插入损耗，但由于低通滤波器本身的性质会导致在接收频段的抑制度变差，为了保证通讯的质量，会增加对功率放大器230和无线收发机210的噪声抑制要求。在现有技术下，增加对功率放大器230和无线收发机210的噪声抑制难以实现。因而，需要重新分配移动终端的各个部分的参数，使得接收频段的抑制度工作在可接收范围内。
首先，确定移动终端接收通路的接收频段噪声水平是-173dBm/Hz，接收频段的最大抑制度为20分贝。
因此在噪声最恶劣的情况下，无线收发机210在频段1、4、5、8的最大输出功率为4dBm，最小输出功率为-76dBm，接收频段噪声为-155dBm/Hz，在频段2的最大输出功率为4.5dBm，最小输出功率为-76dBm，接收频段噪声为-155dBm/Hz。
发射滤波器220在各个频段的插入损耗均为0.5分贝，在频段1、4、5、8的接收频段衰减为13.5分贝，在频段2的接收频段衰减为15分贝。
无线收发机210及发射滤波器220的参数确定后，即可确定功率放大器230的参数。功率放大器230在各个频段的发射频段放大增益均为24.5分贝，接收带内放大增益均为23.5分贝，在频段1、4的总输出接收频段噪声为-146.5dBm/Hz，在频段2、5、8的总输出接收频段噪声为-145dBm/Hz。
频分双工器250在频段1、4的插入损耗为0.5分贝，在频段2、5、8的插入损耗为1分贝，在各个频段的对接收频段的噪声衰减均为25分贝，输出接收频段噪声为-173.5dBm/Hz。
多路工作开关270的插入损耗为：高频0.8分贝，低频0.5分贝。
传输线的插入损耗为：高频0.7分贝，低频0.5分贝。
以上所述仅为本发明的实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (13)

  1. 一种移动终端，其中，包括：无线收发机、发射滤波器、功率放大器、频分双工器、天线及第一匹配网络器；
    所述无线收发机，用于接收或发送信号，一端与所述发射滤波器的输入端连接，另一端与所述频分双工器的接收端连接；
    所述发射滤波器，所述发射滤波器是低通滤波器，用于选择发射频率，输出端与所述功率放大器的输入端相连，其中，所述低通滤波器是电容电感滤波器；
    所述功率放大器，输出端与所述频分双工器的发射端连接；
    所述频分双工器，包括接收通路及发射通路，所述发射通路采用低通滤波器或带限滤波器，外接端与所述天线相连，其中，所述低通滤波器是电容电感滤波器；
    所述第一匹配网络器，用于实现所述功率放大器与所述频分双工器之间的阻抗匹配，一端与所述功率放大器的输出端连接，另一端与所述频分双工器的发射端连接。
  2. 根据权利要求1所述的移动终端，其中，所述电容电感滤波器包括多组LC∏型滤波电路，所述LC∏型滤波电路包括第一电容、电感及第二电容，所述第一电容一端接地端，另一端与所述电感相连，所述电感的另一端与所述第二电容的一端相连，所述第二电容的另一端接地端，且第一组LC∏型滤波电路与第二组LC∏型滤波电路共用第一组LC∏型滤波电路的第二电容，第二组LC∏型滤波电路与第三组LC∏型滤波电路共用第二组LC∏型滤波电路的第二电容，依次类推。
  3. 根据权利要求1所述的移动终端，其中，所述终端还包括：
    第二匹配网络器，用于实现所述频分双工器与所述天线之间的阻抗匹配，一端与所述频分双工器的外接端连接，另一端与所述天线连接。
  4. 根据权利要求1所述的移动终端，其中，
    所述无线收发机在频段1、4、5、8的最大输出功率为4dBm，最小输出功率为-76dBm，接收频段噪声为-155dBm/Hz，在频段2的最大输出功率为4.5dBm，最小输出功率为-76dBm，接收频段噪声为-155dBm/Hz；
    所述发射滤波器在各个频段的插入损耗均为0.5分贝，在频段1、4、5、8的接收频段衰减为13.5分贝，在频段2的接收频段衰减为15分贝；
    所述功率放大器在各个频段的发射频段放大增益均为24.5分贝，接收带内放大增益均为23.5分贝，在频段1、4的总输出接收频段噪声为-146.5dBm/Hz，在频段2、5、8的总输出接收频段噪声为-145dBm/Hz；
    所述频分双工器在频段1、4的插入损耗为0.5分贝，在频段2、5、8的插入损耗为1分贝，在各个频段的对接收频段的噪声衰减均为25分贝，输出接收频段噪声为-173.5dBm/Hz。
  5. 一种发射滤波器，其中，所述发射滤波器是低通滤波器。
  6. 根据权利要求5所述的发射滤波器，其中，所述低通滤波器是电容电感滤波器。
  7. 根据权利要求6所述的发射滤波器，其中，所述电容电感滤波器包括多组LC∏型滤波电路，所述LC∏型滤波电路包括第一电容、电感及第二电容，所述第一电容一端接地端，另一端与所述电感相连，所述电感的另一端与所述第二电容的一端相连，所述第二电容的另一端接地端，且第一组LC∏型滤波电路与第二组LC∏型滤波电路共用第一组LC∏型滤波电路的第二电容，第二组LC∏型滤波电路与第三组LC∏型滤波电路共用第二组LC∏型滤波电路的第二电容，依次类推。
  8. 一种移动终端，其中，包括：无线收发机、发射滤波器、功率放大器、频分双工器及天线；
    所述无线收发机，用于接收或发送信号，一端与所述发射滤波器的输入端连接，另一端与所述频分双工器的接收端连接；
    所述发射滤波器，所述发射滤波器是低通滤波器，用于选择发射频率，输出端与所述功率放大器的输入端相连；
    所述功率放大器，输出端与所述频分双工器的发射端连接；
    所述频分双工器，包括接收通路及发射通路，所述发射通路采用低通滤波器或带限滤波器，外接端与所述天线相连。
  9. 根据权利要求8所述的移动终端，其中，所述低通滤波器是电容电感滤波器。
  10. 根据权利要求9所述的移动终端，其中，所述电容电感滤波器包括多组LC∏型滤波电路，所述LC∏型滤波电路包括第一电容、电感及第二电容，所述第一电容一端接地端，另一端与所述电感相连，所述电感的另一端与所述第二电容的一端相连，所述第二电容的另一端接地端，且第一组LC∏型滤波电路与第二组LC∏型滤波电路共用第一组LC∏型滤波电路的第二电容，第二组LC∏型滤波电路与第三组LC∏型滤波电路共用第二组LC∏型滤波电路的第二电容，依次类推。
  11. 根据权利要求8所述的移动终端，其中，所述终端还包括：
    第一匹配网络器，用于实现所述功率放大器与所述频分双工器之间的阻抗匹配，一端与所述功率放大器的输出端连接，另一端与所述频分双工器的发射端连接。
  12. 根据权利要求8所述的移动终端，其中，所述终端还包括：
    第二匹配网络器，用于实现所述频分双工器与所述天线之间的阻抗匹配，一端与所述频分双工器的外接端连接，另一端与所述天线连接。
  13. 根据权利要求8所述的移动终端，其中，
    所述无线收发机在频段1、4、5、8的最大输出功率为4dBm，最小输出功率为-76dBm，接收频段噪声为-155dBm/Hz，在频段2的最大输出功率为4.5dBm，最小输出功率为-76dBm，接收频段噪声为-155dBm/Hz；
    所述发射滤波器在各个频段的插入损耗均为0.5分贝，在频段1、4、5、8的接收频段衰减为13.5分贝，在频段2的接收频段衰减为15分贝；
    所述功率放大器在各个频段的发射频段放大增益均为24.5分贝，接收带内放大增益均为23.5分贝，在频段1、4的总输出接收频段噪声为-146.5dBm/Hz，在频段2、5、8的总输出接收频段噪声为-145dBm/Hz；
    所述频分双工器在频段1、4的插入损耗为0.5分贝，在频段2、5、8的插入损耗为1分贝，在各个频段的对接收频段的噪声衰减均为25分贝，输出接收频段噪声为-173.5dBm/Hz。
PCT/CN2012/081570 2011-11-23 2012-09-19 发射滤波器及移动终端 WO2013075542A1 (zh)

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