WO2020238078A1 - 一种band14信号的抑制电路和智能终端设备 - Google Patents

一种band14信号的抑制电路和智能终端设备 Download PDF

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WO2020238078A1
WO2020238078A1 PCT/CN2019/119789 CN2019119789W WO2020238078A1 WO 2020238078 A1 WO2020238078 A1 WO 2020238078A1 CN 2019119789 W CN2019119789 W CN 2019119789W WO 2020238078 A1 WO2020238078 A1 WO 2020238078A1
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Prior art keywords
band14
signal
suppression circuit
filter
active low
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PCT/CN2019/119789
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English (en)
French (fr)
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温鼎宁
贾宇
陶龙西
张华�
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惠州Tcl移动通信有限公司
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Priority to US17/435,707 priority Critical patent/US11881880B2/en
Publication of WO2020238078A1 publication Critical patent/WO2020238078A1/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
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • 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
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B1/0475—Circuits with means for limiting noise, interference or distortion
    • 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
    • H04B1/1018—Means associated with receiver for limiting or suppressing noise or interference noise filters connected between the power supply and the receiver
    • 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
    • H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
    • H04B1/1036—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters
    • 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
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B2001/0408—Circuits with power amplifiers

Definitions

  • This application relates to the field of communication technology, and in particular to a band14 signal suppression circuit and intelligent terminal equipment.
  • LTE Long Term Evolution
  • UMTS Universal Mobile Telecommunications System
  • 3GPP The 3rd Generation Partnership Project
  • the LTE is divided into multiple frequency bands.
  • the frequency band of band14 is 788MHz-798MHz.
  • AGPS Assisted Global Positioning System
  • the frequency of the AGPS signal is 1.574G Therefore, the frequency band of the second harmonic of the band14 signal is located near the frequency band of the AGPS signal, so the band14 signal causes great interference to the smart terminal device receiving the AGPS signal.
  • This application provides a band14 signal suppression circuit and intelligent terminal equipment, which can overcome the interference of the band14 signal on the intelligent terminal equipment receiving auxiliary global positioning system signals.
  • This application provides a band14 signal suppression circuit, which includes a duplexer, an active low-pass filter, and a resonant filter.
  • the input end of the duplexer is connected to the transmitter through a power amplifier.
  • the output end of the worker is connected to the input end of the active low-pass filter, the output end of the active low-pass filter is connected to the main antenna, and the resonant filter is connected in parallel to the active low-pass filter and Between the main antennas;
  • the power amplifier is used to receive the band14 signal transmitted by the transmitter and perform power amplification;
  • the duplexer, active low-pass filter and resonant filter are used to power
  • the second harmonic in the amplified band14 signal is filtered and suppressed to eliminate the interference of the band14 signal on the auxiliary global satellite positioning system signal;
  • the resonant filter is a coil group formed by using one end of the open line as a surrounding center and surrounding multiple times in a counterclockwise or clockwise direction.
  • the surrounding center is open, the other end of the open line is connected to a microstrip line as an input end, and the input end is connected to the active low-pass filter and the main antenna.
  • the length of the microstrip line is 25 mils, and the characteristic impedance of the microstrip line is 50 ohms.
  • the line width of the open route is 5 mils
  • the line spacing between two adjacent loops is 5 mils
  • the number of winding loops is 5.5.
  • the height of the resonant filter is 135 mils, and the width is 115 mils.
  • the application also provides a band14 signal suppression circuit, including a duplexer, an active low-pass filter, and a resonant filter.
  • the input end of the duplexer is connected to the transmitter through a power amplifier, and the duplexer
  • the output end of the active low-pass filter is connected to the input end of the active low-pass filter, the output end of the active low-pass filter is connected to the main antenna, and the resonant filter is connected in parallel to the active low-pass filter and the Between the main antennas;
  • the power amplifier is used to receive the band14 signal transmitted by the transmitter and perform power amplification;
  • the duplexer, active low-pass filter and resonant filter are used to amplify the power
  • the second harmonic in the band14 signal is filtered and suppressed to eliminate the interference of the band14 signal on the auxiliary global satellite positioning system signal.
  • the resonant filter is a coil group formed by using one end of the open line as a surrounding center and surrounding multiple times in a counterclockwise or clockwise direction.
  • the surrounding center is open, the other end of the open line is connected to a microstrip line as an input end, and the input end is connected to the active low-pass filter and the main antenna.
  • the line width of the open line is 5 mils
  • the line spacing between two adjacent loops is 5 mils
  • the number of surrounding loops is 5.5 loops.
  • the characteristic impedance of the open path is 50 ohms.
  • the length of the microstrip line is 25 mils, and the characteristic impedance of the microstrip line is 50 ohms.
  • the height of the resonant filter is 135 mils, and the width is 115 mils.
  • the suppression circuit further includes an inductor, one end of the inductor is grounded, and the other end is connected to the common end of the resonance filter and the main antenna.
  • This application also provides an intelligent terminal device, including a band14 signal suppression circuit.
  • This application provides a band14 signal suppression circuit and intelligent terminal equipment.
  • a duplexer, an active low-pass filter and a resonant filter are designed, and the duplexer, active low-pass filter and resonance are used in turn
  • the filter filters and suppresses the second harmonic in the band14 signal, completely removes the second harmonic in the band14 signal, and eliminates the interference effect of the band14 signal on the auxiliary global positioning system signal.
  • Fig. 1 is a circuit diagram of band14 signal suppression according to an embodiment of the application
  • FIG. 2 is a schematic diagram of a resonant filter according to an embodiment of the application.
  • FIG. 3 is a circuit diagram of suppressing the band14 signal according to another embodiment of the application.
  • LTE Long Term Evolution
  • UMTS Universal Mobile Telecommunications System
  • 3GPP The 3rd Generation Partnership Project
  • the LTE system introduces key technologies such as OFDM (Orthogonal Frequency Division Multiplexing) and MIMO (Multi-Input & Multi-Output), which significantly increase the spectral efficiency and data transmission rate (20M bandwidth 2X2MIMO in the In the case of 64QAM, the theoretical maximum downlink transmission rate is 201Mbps, and it is about 150Mbps after removing the signaling overhead.
  • OFDM Orthogonal Frequency Division Multiplexing
  • MIMO Multi-Input & Multi-Output
  • the downlink peak rate is 100Mbps and the uplink is 50Mbps), and supports multiple bandwidth allocation : 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz and 20MHz, etc., and support the global mainstream 2G/3G frequency bands and some new frequency bands, so the spectrum allocation is more flexible, and the system capacity and coverage are also significantly improved.
  • LTE is divided into more than 40 frequency bands, and each frequency band is called band.
  • the band14 frequency band is 788MHz-798MHz.
  • the frequency of the AGPS (Assisted Global Positioning System) signal it receives is 1.574 GHz. Therefore, the frequency band of the second harmonic of the band14 signal is near the AGPS signal frequency band, so band14 The second harmonic of the signal will cause interference to the AGPS signal. In this way, the positioning function of the smart terminal device will be abnormal, or the positioning function will not be accurate enough.
  • AGPS Assisted Global Positioning System
  • an embodiment of the present invention provides a band14 signal suppression circuit.
  • the suppression circuit includes a duplexer 3, an active low-pass filter LPF (Low Pass Filter) 4, and a resonance filter.
  • the input end of duplexer 3 is connected to transmitter 1 through power amplifier 2, the output end of duplexer 3 is connected to the input end of active low-pass filter 4, and the output of active low-pass filter LPF 4
  • the terminal is connected to the main antenna, and the resonant filter 5 is connected in parallel between the active low-pass filter 4 and the main antenna.
  • the power amplifier 2 is used to receive the band14 signal transmitted by the transmitter 1 and amplify the power.
  • the amplified band14 signal passes through the duplexer 3, the active low pass filter LPF 4 (Low Pass Filter) and the resonance in turn Filter 5, duplexer 3, active low-pass filter LPF 4, and resonant filter 5 filter and suppress the second harmonics in the amplified band14 signal, and the filtered band14 signal will assist the global positioning system.
  • AGPS Assisted Global Positioning System
  • This embodiment uses the triple filter suppression of the duplexer 3, the active low-pass filter LPF 4 and the resonant filter 5 to completely filter out the second harmonics in the band14 signal and eliminate the interference of the band14 signal on the AGPS signal. , So that the positioning function of the smart terminal device will not be affected.
  • the band14 signal suppression circuit adds a duplexer 3, an active low-pass filter LPF 4, and a resonance filter 5 to the band14 transmission path, and the band14 signal transmitted by the transmitter 1 passes through the duplex After being filtered and suppressed by the filter 3 and the active low-pass filter LPF 4, the band 14 signal radiated is radiated out through the main antenna, and the radiated band14 signal has no interference to the AGPS signal.
  • the duplexer 3 and the active low-pass filter LPF 4 can suppress the second harmonic of the band14 signal.
  • the duplexer 3 can suppress the second harmonic of the band14 signal by 48dB.
  • Active low-pass filter The LPF 4 can suppress the second harmonic of band14 signal by 35dB.
  • the second harmonic of band14 signal can be suppressed by 83dB, and the suppression effect is not thorough enough.
  • a resonant filter 5 is added.
  • the resonant filter 5 can suppress the second harmonic of the band14 signal by 23dB, and passes through the duplexer 3, the active low-pass filter LPF 4 and the resonant filter.
  • the second harmonic of the band14 signal is filtered out more thoroughly, which can completely eliminate the interference of the band14 signal on the AGPS signal of the auxiliary global positioning system.
  • the band14 signal suppression circuit provided in this embodiment has no suppression effect on the first harmonic of the band14 signal (also called the main wave of the band14 signal), but only suppresses the second harmonic of the band14 signal without affecting band14.
  • the main function of the signal the suppression of the main wave of the band14 signal by the resonant filter 5 is 0.085dB, and the suppression of the second harmonic of the band14 signal is 23.158dB, which will not affect the main effect of the band14 signal.
  • the resonant filter 5 is an open path of 1/4 wavelength. Since the 1/4 wavelength can transmit the band14 signal, it is only necessary to add a 1/4 wavelength resonant filter 5 in parallel in the band14 transmission path.
  • the length of the route is 1870mil calculated by the above formula.
  • the resonant filter 5 is a coil group formed by encircling multiple turns counterclockwise or clockwise with one end of the open path as the center of the loop.
  • the embodiment of the present invention processes the 1870 mil open path. Specifically, with one end of the open line as the center of the circle, the open line is looped counterclockwise or clockwise multiple times to form a coil group, and the coil group formed after the open line is looped is called the resonant filter 5.
  • the total length of the open path surrounding the resonant filter 5 is 1870 mil, and the resonant filter 5 after the surrounding occupies less space than the original open path.
  • the open circuit around the center, the other end of the open route is connected to a microstrip line 6 as an input end, and the input end is connected to the LPF and the main antenna. That is, the center end of the resonant filter 5 is open, and the other end is connected to a microstrip line 6 as the input end.
  • the resonant filter 5 is connected in parallel between the active low-pass filter LPF 4 and the main antenna through the microstrip line 6 .
  • the characteristic impedance of the open path surrounding the resonant filter 5 and the microstrip line 6 are both 50 ohms.
  • the line width of the open line is designed to be 5 mils
  • the line spacing between two adjacent loops is designed to be 5 mils
  • the number of loops is 5.5
  • the length of the microstrip line 6 is 25 mils.
  • the line width of the open route and the line spacing between two adjacent loops are not limited.
  • the line width of the open route and the line spacing between two adjacent loops are designed to be different. The number will also be different, as long as the total length of the open route is 1870mil.
  • the open route is looped and wound on the PCB.
  • the height of the resonant filter 5 on the PCB stack is 135 mils and the width is 115 mils.
  • the resonant filter 5 is connected to the microstrip line
  • the direction of 6 is the height direction, and the direction perpendicular to the height direction is the width direction.
  • the band14 signal suppression circuit further includes an inductor based on the above-mentioned FIG. 1, one end of the inductor is grounded, and the other end is connected to the common end of the resonance filter 5 and the main antenna .
  • the inductor is used to fine-tune the resonance point of the resonance filter 5 to improve the working performance of the resonance filter 5.
  • an intelligent terminal device is provided.
  • a band14 signal suppression circuit of the foregoing embodiment is provided.
  • the suppression circuit can suppress the second harmonic of the band14 signal, and the suppressed band14 signal pair
  • the AGPS signal received by the smart terminal device will not cause interference. Therefore, if the smart terminal is designed to suppress the band14 signal, the smart terminal device will not be interfered by the band14 signal when receiving the AGPS signal, and the positioning function is normal.
  • This application provides a band14 signal suppression circuit and intelligent terminal equipment.
  • a duplexer, an active low-pass filter and a resonant filter are designed, and the duplexer, active low-pass filter and resonance are used in turn
  • the filter filters and suppresses the second harmonic in the band14 signal, completely removes the second harmonic in the band14 signal, and eliminates the interference effect of the band14 signal on the auxiliary global positioning system signal.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
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Abstract

本申请提供了一种band14信号的抑制电路和智能终端设备，在band14发射通路中设计双工器、有源低通滤波器和谐振滤波器，对band14信号中的二次谐波进行过滤抑制，消除band14信号对辅助全球定位系统信号造成的干扰影响。

Description

一种band14信号的抑制电路和智能终端设备
本申请要求于2019年05月31号提交中国专利局、申请号为201910472220.7发明名称为“一种band14信号的抑制电路和智能终端设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种band14信号的抑制电路和智能终端设备。
背景技术
LTE(Long Term Evolution，长期演进)是由3GPP(The 3rd Generation Partnership Project，第三代合作伙伴计划)组织制定的UMTS(Universal Mobile Telecommunications System，通用移动通信系统)技术标准的长期演进。
LTE划分为多个频段，其中，band14的频段为788MHz-798MHz，在针对北美市场的智能终端设备使用AGPS(Assisted Global Positioning System，辅助全球卫星定位系统)功能时，由于AGPS信号的频率在1.574G附近，因此，band14信号的二次谐波的频段位于AGPS信号的频段附近，故band14信号对智能终端设备接收AGPS信号造成很大的干扰。
到目前为止，还没有一个很好的解决方案，彻底消除band14信号对AGPS信号的干扰。
技术问题
本申请提供了一种band14信号的抑制电路和智能终端设备，能够克服band14信号对智能终端设备接收辅助全球定位系统信号的干扰。
技术解决方案
本申请提供了一种band14信号的抑制电路，包括一双工器、一有源低通滤波器和一谐振滤波器，所述双工器的输入端通过功率放大器与发射器连接，所述双工器的输出端与所述有源低通滤波器的输入端连接，所述有源低通滤波器的输出端连接主天线，所述谐振滤波器并联在所述有源低通滤波器和所述主天线之间；所述功率放大器，用于接收所述发射器发射的band14信号，并进行功率放大；所述双工器、有源低通滤波器和谐振滤波器，用于对功率放大后的band14信号中的二次谐波进行过滤抑制，以消除band14信号对辅助全球卫 星定位系统信号的干扰；所述谐振滤波器为开路线，所述开路线的长度为λ'，其中，λ'＝1/4λ，λ＝c/f，其中，c为光速，f为辅助全球卫星定位系统信号频率；所述抑制电路还包括一电感，所述电感的一端接地，另一端与所述谐振滤波器和所述主天线的公共端连接。
在上述技术方案的基础上，本申请还可以做如下改进。
进一步的，所述谐振滤波器为以所述开路线的一端作为环绕中心，按逆时针或顺时针环绕多圈形成的线圈组。
进一步的，所述环绕中心开路，所述开路线的另一端连接一微带线作为输入端，所述输入端与所述有源低通滤波器和主天线连接。
进一步的，所述微带线的长度为25mil，所述微带线的特性阻抗为50欧。
进一步的，所述开路线的线宽为5mil，相邻两圈线之间的线间距为5mil，所述环绕圈数为5.5圈。
进一步的，所述谐振滤波器的高度为135mil，宽度为115mil。
本申请还提供了一种band14信号的抑制电路，包括双工器、有源低通滤波器和谐振滤波器，所述双工器的输入端通过功率放大器与发射器连接，所述双工器的输出端与所述有源低通滤波器的输入端连接，所述有源低通滤波器的输出端连接主天线，所述谐振滤波器并联在所述有源低通滤波器和所述主天线之间；所述功率放大器，用于接收所述发射器发射的band14信号，并进行功率放大；所述双工器、有源低通滤波器和谐振滤波器，用于对功率放大后的band14信号中的二次谐波进行过滤抑制，以消除band14信号对辅助全球卫星定位系统信号的干扰。
在上述技术方案的基础上，本申请还可以做如下改进。
进一步的，所述谐振滤波器为开路线，所述开路线的长度为λ'，其中，λ'＝1/4λ，λ＝c/f，其中，c为光速，f为辅助全球卫星定位系统信号频率。
进一步的，所述谐振滤波器为以所述开路线的一端作为环绕中心，按逆时针或顺时针环绕多圈形成的线圈组。
进一步的，所述环绕中心开路，所述开路线的另一端连接一微带线作为输入端，所述输入端与所述有源低通滤波器和主天线连接。
进一步的，所述开路线的线宽为5mil，相邻两圈线之间的线间距为5mil， 所述环绕圈数为5.5圈。
进一步的，所述开路线的特性阻抗为50欧。
进一步的，所述微带线的长度为25mil，所述微带线的特性阻抗为50欧。
进一步的，所述谐振滤波器的高度为135mil，宽度为115mil。
进一步的，所述抑制电路还包括一电感，所述电感的一端接地，另一端与所述谐振滤波器和所述主天线的公共端连接。
本申请还提供了一种智能终端设备，包括一种band14信号的抑制电路。
有益效果
本申请提供的一种band14信号的抑制电路和智能终端设备，band14发射通路中设计双工器、有源低通滤波器和谐振滤波器，依次利用双工器、有源低通滤波器和谐振滤波器对band14信号中的二次谐波进行过滤抑制，彻底滤除掉band14信号中的二次谐波，消除band14信号对辅助全球定位系统信号造成的干扰影响。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本申请一个实施例的band14信号的抑制电路图；
图2为本申请一个实施例的谐振滤波器示意图；
图3为本申请另一个实施例的对band14信号的抑制电路图。
附图中，各标号所代表的部件名称如下：
1、发射器，2、功率放大器，3、双工器，4、有源低通滤波器，5、谐振滤波器，6、微带线。
本发明的实施方式
下面结合附图和实施例，对本申请的具体实施方式作进一步详细描述。以下实施例用于说明本发明，但不用来限制本发明的范围。
在通信领域，LTE(Long Term Evolution，长期演进)是由3GPP(The 3rd Generation Partnership Project，第三代合作伙伴计划)组织制定的UMTS (Universal Mobile Telecommunications System，通用移动通信系统)技术标准的长期演进。LTE系统引入了OFDM(Orthogonal Frequency Division Multiplexing，正交频分复用)和MIMO(Multi-Input&Multi-Output，多输入多输出)等关键技术，显著增加了频谱效率和数据传输速率(20M带宽2X2MIMO在64QAM情况下，理论下行最大传输速率为201Mbps，除去信令开销后大概为150Mbps，但根据实际组网以及终端能力限制，一般认为下行峰值速率为100Mbps，上行为50Mbps)，并支持多种带宽分配：1.4MHz，3MHz，5MHz，10MHz，15MHz和20MHz等，且支持全球主流2G/3G频段和一些新增频段，因而频谱分配更加灵活，系统容量和覆盖也显著提升。
目前，LTE划分为40多个频段，每一个频段称为band，其中，band14频段为788MHz-798MHz，对于北美市场，多数智能终端设备工作时占用band14频段。当智能终端设备使用到定位功能时，其接收的辅助全球定位系统AGPS(Assisted Global Positioning System)信号的频率为1.574GHz,因此，band14信号的二次谐波的频段处于AGPS信号频段附近，故band14信号的二次谐波会对AGPS信号造成干扰，这样，智能终端设备的定位功能就会出现异常，或者定位功能不够准确。
为了解决上述这个问题，参见图1，本发明一个实施例提供了一种band14信号的抑制电路，该抑制电路包括双工器3、有源低通滤波器LPF(Low Pass Filter)4和谐振滤波器5，双工器3的输入端通过功率放大器2与发射器1连接，双工器3的输出端与有源低通滤波器4的输入端连接，有源低通滤波器LPF 4的输出端连接主天线，谐振滤波器5并联在有源低通滤波器4和主天线之间。
其中，功率放大器2，用于接收发射器1发射的band14信号，并进行功率放大，功率放大后的band14信号依次经过双工器3、有源低通滤波器LPF 4(Low Pass Filter)和谐振滤波器5，双工器3、有源低通滤波器LPF 4以及谐振滤波器5对功率放大后的band14信号中的二次谐波进行过滤抑制，过滤抑制后的band14信号对辅助全球定位系统AGPS(Assisted Global Positioning System)信号没有干扰影响。本实施例利用双工器3、有源低通滤波器LPF 4和谐振滤波器5的三重过滤抑制后，彻底滤除掉band14信号中的二次谐波， 消除了band14信号对AGPS信号的干扰，使得智能终端设备的定位功能不会受到影响。
具体的，本实施例提供的band14信号的抑制电路，在band14发射通路中增加双工器3、有源低通滤波器LPF 4和谐振滤波器5，由发射器1发射的band14信号经过双工器3和有源低通滤波器LPF 4过滤抑制后经主天线辐射出去，辐射出的band14信号对AGPS信号没有干扰。其中，双工器3和有源低通滤波器LPF 4能够对band14信号的二次谐波进行抑制，通常，双工器3对band14信号的二次谐波能够抑制48dB，有源低通滤波器LPF 4对band14信号的二次谐波能够抑制35dB。因此，在双工器3和有源低通滤波器LPF 4的共同抑制作用下，能够对band14信号的二次谐波抑制83dB，抑制效果不够彻底，故在双工器3和有源低通滤波器LPF 4的基础上再增加一个谐振滤波器5，其中，谐振滤波器5对band14信号的二次谐波能够抑制23dB，经过双工器3、有源低通滤波器LPF 4和谐振滤波器5的三重抑制作用下，band14信号的二次谐波滤除得比较彻底，能够完全消除band14信号对辅助全球定位系统AGPS信号的干扰。
需要说明的是，本实施例提供的band14信号的抑制电路对band14信号的一次谐波(也称为band14信号的主波)没有抑制作用，只是抑制band14信号的二次谐波，不会影响band14信号的主要功能。其中，谐振滤波器5对band14信号的主波的抑制为0.085dB，而对band14信号的二次谐波的抑制为23.158dB，不会影响到band14信号的主体作用。
在本申请的一个实施例中，谐振滤波器5为开路线，开路线的长度为λ'，λ'＝1/4λ，λ＝c/f，其中，c为光速，f为AGPS信号频率，f＝1.574GHz，’λ'＝1870mil。
具体的，谐振滤波器5为1/4波长的开路线，由于1/4波长就能够将band14信号发射出，故只需要在band14发射通路中并联增加一个1/4波长的谐振滤波器5，由上述的公式计算出开路线的长度为1870mil。
参见图2，在本发明的一个实施例中，谐振滤波器5为以开路线的一端作为环绕中心，按逆时针或顺时针环绕多圈形成的线圈组。
由于在band14发射通路上直接并联1870mil的开路线，将会占用非常大 的空间，因此，本发明实施例对1870mil的开路线进行处理。具体为，以开路线的一端为环绕中心，逆时针或者顺时针将开路线环绕多圈，环绕成线圈组，开路线环绕后形成的线圈组即称为谐振滤波器5。环绕成谐振滤波器5的开路线的总长为1870mil，环绕后的谐振滤波器5比较原始的开路线所占用的空间小。
其中，环绕中心开路，开路线的另一端连接一微带线6作为输入端，输入端与所述LPF和主天线连接。即谐振滤波器5的环绕中心端为开路状态，另外一端连接一微带线6作为输入端，通过微带线6将谐振滤波器5并联在有源低通滤波器LPF 4和主天线之间。其中，环绕成谐振滤波器5的开路线和微带线6的特性阻抗均为50欧。
在本发明的一个实施例中，开路线的线宽设计为5mil，相邻两圈线之间的线间距设计为5mil，环绕圈数为5.5圈，微带线6的长度为25mil。
需要说明的是，本实施例中并不限制开路线的线宽和相邻两圈线之间的线间距，开路线的线宽和相邻两圈的线间距设计得不同，那么环绕的圈数也会不同，只要保持开路线的总长为1870mil即可。
其中，谐振滤波器5与微带线6的连接处有一部分重合，重合的长度为线宽5mil，可参见图2。通过上述的方式对开路线进行环绕，绕制在PCB板上，绕制而成的谐振滤波器5在PCB叠层上的高度为135mil，宽度为115mil，其中，谐振滤波器5连接微带线6的方向为高度方向，与高度方向垂直的方向即为宽度方向。
参见图3，在本发明的一个实施例中，band14信号的抑制电路在上述图1的基础上还包括一电感，该电感的一端接地，另一端与谐振滤波器5和主天线的公共端连接。该电感以对谐振滤波器5的谐振点进行微调，提升谐振滤波器5的工作性能。
本申请的又一个实施例中，提供了一种智能终端设备，该智能终端设备中前述实施例的一种band14信号的抑制电路。
将上述实施例的band14信号的抑制电路安装于智能终端设备中，那么当智能终端设备使用GPS定位功能时，其中的抑制电路能够对band14信号的二次谐波进行抑制，抑制后的band14信号对智能终端设备接收的辅助全球定位 系统AGPS信号不会产生干扰。因此，在智能终端终端设计对band14信号的抑制电路，那么该智能终端设备在在接收AGPS信号时，则不会受到band14信号的干扰，定位功能正常。
本申请提供的一种band14信号的抑制电路和智能终端设备，band14发射通路中设计双工器、有源低通滤波器和谐振滤波器，依次利用双工器、有源低通滤波器和谐振滤波器对band14信号中的二次谐波进行过滤抑制，彻底滤除掉band14信号中的二次谐波，消除band14信号对辅助全球定位系统信号造成的干扰影响。
综上所述，虽然本申请已将优选实施例揭露如上，但上述优选实施例并非用以限制本申请，本领域的普通技术人员，在不脱离本申请的精神和范围内，均可作各种更动与润饰，因此本申请的保护范围以权利要求界定的范围为准。

Claims (16)

  1. 一种band14信号的抑制电路，其包括一双工器、一有源低通滤波器和一谐振滤波器，所述双工器的输入端通过功率放大器与发射器连接，所述双工器的输出端与所述有源低通滤波器的输入端连接，所述有源低通滤波器的输出端连接主天线，所述谐振滤波器并联在所述有源低通滤波器和所述主天线之间；
    所述功率放大器，用于接收所述发射器发射的band14信号，并进行功率放大；
    所述双工器、有源低通滤波器和谐振滤波器，用于对功率放大后的band14信号中的二次谐波进行过滤抑制，以消除band14信号对辅助全球卫星定位系统信号的干扰；
    所述谐振滤波器为开路线，所述开路线的长度为λ'，其中，λ'＝1/4λ，λ＝c/f，其中，c为光速，f为辅助全球卫星定位系统信号频率；
    所述抑制电路还包括一电感，所述电感的一端接地，另一端与所述谐振滤波器和所述主天线的公共端连接。
  2. 根据权利要求1所述的band14信号的抑制电路，其中所述谐振滤波器为以所述开路线的一端作为环绕中心，按逆时针或顺时针环绕多圈形成的线圈组。
  3. 根据权利要求2所述的band14信号的抑制电路，其中所述环绕中心开路，所述开路线的另一端连接一微带线作为输入端，所述输入端与所述有源低通滤波器和主天线连接。
  4. 根据权利要求3所述的band14信号的抑制电路，其中所述微带线的长度为25mil，所述微带线的特性阻抗为50欧。
  5. 根据权利要求2所述的band14信号的抑制电路，其中所述开路线的线宽为5mil，相邻两圈线之间的线间距为5mil，所述环绕圈数为5.5圈。
  6. 根据权利要求5所述的band14信号的抑制电路，其中所述谐振滤波器的高度为135mil，宽度为115mil。
  7. 一种band14信号的抑制电路，其包括一双工器、一有源低通滤波器和一谐振滤波器，所述双工器的输入端通过功率放大器与发射器连接，所述双工 器的输出端与所述有源低通滤波器的输入端连接，所述有源低通滤波器的输出端连接主天线，所述谐振滤波器并联在所述有源低通滤波器和所述主天线之间；
    所述功率放大器，用于接收所述发射器发射的band14信号，并进行功率放大；
    所述双工器、有源低通滤波器和谐振滤波器，用于对功率放大后的band14信号中的二次谐波进行过滤抑制，以消除band14信号对辅助全球卫星定位系统信号的干扰。
  8. 根据权利要求7所述的band14信号的抑制电路，其中所述谐振滤波器为开路线，所述开路线的长度为λ'，其中，λ'＝1/4λ，λ＝c/f，其中，c为光速，f为辅助全球卫星定位系统信号频率。
  9. 根据权利要求8所述的band14信号的抑制电路，其中所述谐振滤波器为以所述开路线的一端作为环绕中心，按逆时针或顺时针环绕多圈形成的线圈组。
  10. 根据权利要求9所述的band14信号的抑制电路，其中所述环绕中心开路，所述开路线的另一端连接一微带线作为输入端，所述输入端与所述有源低通滤波器和主天线连接。
  11. 根据权利要求10所述的band14信号的抑制电路，其中所述微带线的长度为25mil，所述微带线的特性阻抗为50欧。
  12. 根据权利要求9所述的band14信号的抑制电路，其中所述开路线的线宽为5mil，相邻两圈线之间的线间距为5mil，所述环绕圈数为5.5圈。
  13. 根据权利要求12所述的band14信号的抑制电路，其中所述谐振滤波器的高度为135mil，宽度为115mil。
  14. 根据权利要求10所述的band14信号的抑制电路，其中所述开路线的特性阻抗为50欧。
  15. 根据权利要求7所述的band14信号的抑制电路，其中所述抑制电路还包括一电感，所述电感的一端接地，另一端与所述谐振滤波器和所述主天线的公共端连接。
  16. 一种智能终端设备，其包括如权利要求7所述的一种band14信号的 抑制电路。
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