CN107565991A - A kind of radio-frequency match module, the radio system for mobile terminal - Google Patents
A kind of radio-frequency match module, the radio system for mobile terminal Download PDFInfo
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- CN107565991A CN107565991A CN201710755430.8A CN201710755430A CN107565991A CN 107565991 A CN107565991 A CN 107565991A CN 201710755430 A CN201710755430 A CN 201710755430A CN 107565991 A CN107565991 A CN 107565991A
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Abstract
A kind of radio-frequency match module, the radio system for mobile terminal, belong to the communications field.The present invention provides a kind of radio-frequency match module, including：Tie point, the second branch road and transmission line；The transmission line both ends are connected with the tie point and the second branch road of ground connection parallel with one another；Wherein, both the tie point and second branch road are the circuit of different reactance characteristics；Tie point is capacitive circuit or inductive circuit, and second branch road is inductive circuit or capacitive circuit.The transmission line is the transmission line of 1/8th wavelength.The present invention is by cabling and two branch combinations into a kind of new matching network, the cabling of one section of 1/8th wavelength of string, impedance matching is carried out together with two branch roads between two branch roads, makes printed circuit board layout more succinct, improve adjustment method unification, be easy and fast to solve debugging problem.
Description
Technical field
The present embodiments relate to the communications field, more particularly to a kind of radio-frequency match module, the radio frequency for mobile terminal
System.
Background technology
Radio frequency (Radio Frequency, RF) refers exclusively to the electromagnetic wave that there is certain wavelength can be used for radio communication.It is used for
Producing the high-frequency circuit of radio frequency turns into radio circuit, is substantially made up of passive element, active device and passive network.With
The development of the communication technology, frequency used in communication equipment increasingly improves, and radio frequency (RF) and microwave (MW) circuit are in a communications system
Extensive use, radio circuit design field have obtained the special attention of industrial quarters.
The electronic installation that wireless signal can be launched as mobile phone this one kind must be noted that impedance matching, in radiofrequency signal from power
Amplifier (power amplifier) is sent in antenna way, if radiofrequency signal meets with unmatched impedance, just has part
Signal energy by antenna-reflected, prevent the signal energy that power amplifier exports from being launched completely by antenna.Therefore, impedance
Fit over the problem of field of wireless communication is critically important.
Generally there are the impedance that an impedance matching circuit is responsible for matching antenna, the energy for launching power amplifier among mobile phone
Amount can be communicated to antenna completely, reach best transmission efficiency.The impedance of antenna may be changed by neighbouring object contributions, this
Outside, present mobile phone supports multiband to communicate mostly.With global system for mobile communications (GSM:Global System for
Mobile Communications) exemplified by, GSM 900, GSM 1800 and GSM 1900 respectively use different frequency range, support this
The mobile phone of three must carry out impedance matching in multiple different frequency ranges.These factors improve the complexity of impedance matching, fixed
The impedance matching circuit of formula is not applied and used, and adjustable impedance matching circuit just has wider matching range, could be applicable
In the complicated applications environment of multiband.
It is terminal as shown in figure 1, for a kind of video circuit structural representation of the terminal of wireless communication system of prior art
Wireless communication transceiver, it contains transmitter circuitry, receiver circuit and communication antenna.This transceiver can be applied
In personal communication and WLAN.In this system, digital processing circuit is mainly handled data signal,
Including sampling, compressing, encoding；Then analog form is become by modulus (A/D) converter and enters analogue signal circuit, then
Launched by antenna.
Radio frequency debugging is link important in terminal radio frequency R＆D process, the power amplifier (power of terminal
Amplifier, PA) supply commercial city have special FAE to support the radio frequency of client debug, convergence problem be always radio-frequency transmissions tune
The difficult point of examination, convergence effect is always undesirable, i.e., enabled by testing certification, other performance indications are also to be compromised, and
And surplus is insufficient.In order to meet the requirement of terminal capabilities index, radio frequency commissioning staff will pass through prolonged fine setting, even if this
Sample, is also difficult to the requirement that touches the mark sometimes, and radio frequency debugging is more repeatedly very long.
In radio circuit designs, in order to ensure the maximum signal energy of transmission, echo is reduced to signal quality and can use
The influence of power, matching network design are the major issues for having to consider.
Patent of invention CN106788563A discloses a kind of matching network circuit of terminal radio frequency circuit, and it is specifically disclosed
According to π types or L-type matching network circuit and parallel circuit, wherein, described parallel circuit one end connects π types or the L-type matching
Lattice network input, other end ground connection, wherein, the parallel circuit includes an electric capacity and an inductance in parallel, described
It is grounded after electric capacity and inductance in parallel.Its convergence can be improved to radio circuit while a frequency range port Impedance is changed.But
Because discrete component is too many, this does not only result in cost increase, and PCB layouts can be made more inconvenient, while adjustment method is single,
Difficult the problem of adjusting may be encountered.
The content of the invention
The problem of present invention exists for prior art, it is proposed that a kind of radio-frequency match module, penetrating for mobile terminal
Display system.
The present invention is combined into a kind of new pair net using in mobile phone radio frequency schematic diagram by cabling and discrete component
Network, the structure of the matching network are to go here and there the cabling of one section of 1/8th wavelength between two discrete components in parallel, the cabling
Impedance conversion can be played a part of, carry out impedance matching together with the discrete component in parallel with two, two discrete components can be
Inductance can also be electric capacity, but the two discrete component reactive can not be identical, and two discrete members are determined according to actual debugging
The reactive and value of part.
The technical scheme is that：
A kind of radio-frequency match module, including：Tie point, the second branch road and transmission line；The transmission line both ends are connected with
The tie point of ground connection parallel with one another and second branch road；Wherein, both the tie point and second branch road
For the circuit of different reactance characteristics, the tie point is capacitive circuit or inductive circuit, and second branch road is inductive circuit
Or capacitive circuit.
As a preference of the present invention, the transmission line is the transmission line of 1/8th wavelength.
As a preference of the present invention, the module be for radio frequency frequency band be 13.56 megahertz of -2.4 gigahertz (GHZ) radio frequency
Matching module.
As a preference of the present invention, the radio-frequency match module that it is 900 megahertzs for the frequency of radio frequency that the module, which is,.
As a preference of the present invention, the tie point is capacitive circuit, it is described when second branch road is inductive circuit
Tie point includes an electric capacity, and second branch road includes an inductance；Or the tie point is inductive circuit, described
When two branch roads are capacitive circuit, the tie point includes an inductance, and second branch road includes an electric capacity.
As a preference of the present invention, the tie point is capacitive circuit, it is described when second branch road is inductive circuit
Electric capacity in tie point is 221 nanohenry electric capacity, and the inductance in second branch road is 9.1 pico farad inductance；Or described first
Branch road is inductive circuit, and when second branch road is capacitive circuit, the inductance in the tie point is 9.1 pico farad inductance, institute
It is 221 nanohenry electric capacity to state the electric capacity in the second branch road.
As a preference of the present invention, the transmission line is the transmission line with impedance mapping function.
As a preference of the present invention, the reactance characteristic of the transmission line is provided simultaneously with inductive and capacitive character.
A kind of radio system for mobile terminal, including：RF receiving and transmission module, radio-frequency match module, antenna；
The radio-frequency match module is connected between the RF receiving and transmission module and the antenna through its transmission line.
As a preference of the present invention, also including filtration module, the filtration module is located at the radio-frequency match module and institute
State between antenna.
Beneficial effect：
A kind of new matching network is combined into by cabling and discrete component, the structure of the matching network is in two parallel connections
Discrete component between go here and there one section of 1/8th wavelength cabling, the cabling can play a part of impedance conversion, it is in parallel with two
Discrete component carry out impedance matching together.
Brief description of the drawings
Fig. 1 is a kind of video circuit structural representation of the terminal of wireless communication system of prior art；
Fig. 2 is a kind of structural representation of radio-frequency match module of the present invention；
Matched when Fig. 3 is tests a kind of radio-frequency match module equivalent circuit diagram of the invention on Smith chart under different situations
The trajectory diagram of circuit impedance；
Fig. 4 is a kind of schematic equivalent circuit with signal source and load；
Fig. 5 is a kind of schematic equivalent circuit with signal source, load and inductance；
Fig. 6 is a kind of schematic equivalent circuit with signal source, load, inductance and transmission line；
Fig. 7 is a kind of schematic equivalent circuit with signal source, load, inductance, transmission line and electric capacity；
Fig. 8 is a kind of structural representation of radio system for mobile terminal of the invention based on radio-frequency match module.
Embodiment
It is the specific embodiment of the present invention and with reference to accompanying drawing below, technical scheme is further described,
But the present invention is not limited to these embodiments.
In normal conditions, all it is by discrete member in the radio-frequency match module of a radio system for being used for mobile terminal
What part was formed, π types either L-type, reach the purpose of matching by changing the value of capacitor and inductor of discrete component, such as
Patent No. CN104767636A patent of invention according to π types or L-type matching network circuit and parallel circuit, wherein, the parallel connection
Circuit on one side connects the π types or L-type matching network circuit input, and the other end is grounded, wherein, the parallel circuit is included simultaneously
An electric capacity and an inductance for connection, it is grounded after the electric capacity and inductance in parallel.But because discrete component is too many, this is not only resulted in
Cost increase, and PCB layouts can be made more inconvenient, while adjustment method is single, may encounter difficult the problem of adjusting.
In the present invention, a kind of new matching network is combined into using by cabling and discrete component, the matching network
Structure is the cabling of one section of 1/8th wavelength of string between two discrete components in parallel, to carry out impedance matching, is used
The usage amount of discrete component is reduced, and makes adjustment method more various, is easy and fast to solve debugging problem.
It is the specific embodiment of the invention below.
Embodiment 1：
As shown in Fig. 2 a kind of radio-frequency match module, including：
Tie point, the second branch road and transmission line；
The transmission line both ends are connected with the tie point of ground connection parallel with one another and second branch road；
Wherein, both the tie point and second branch road be different reactance characteristics circuit, the tie point
For capacitive circuit or inductive circuit, second branch road is inductive circuit or capacitive circuit.
Impedance matching network has become the important component in radio frequency microwave circuit, causes electricity mainly due to matching
Reflected voltage ripple in road tails off, and is reduced so as to be lost.Meanwhile gain of the matching network to device, noise, power output also have
Important influence.In microwave transmission system, it is related to efficiency of transmission, power capacity and the job stability of system, relation
To the systematic error and measurement accuracy of microwave measurement, and a series of problems, such as the quality of microwave device.Now will be original simple
Radio-frequency match module in the pi-network that is formed of three discrete components, pass through point for wherein concatenating two ground connection discrete components
Vertical element is altered to one section of cabling with length, makees jointly with other two discrete component in new radio-frequency match module
With reaching the effect of impedance matching, be finally reached that coaxial line and load is all matched into constant 50 Ω special
The reactance value of property.
The transmission line is the transmission line of 1/8th wavelength.
Transmission theory is pointed out, it is generally the case that the voltage or electric current of transmission line are incidence wave and the reflection by the point
What ripple was formed by stacking, or perhaps be formed by stacking by traveling wave and standing wave.In the microwave system being made up of signal source and load,
If transmission line and load mismatch, standing wave will be formed on transmission line.On the one hand standing wave reduces the power carrying capacity of transmission line, another
Aspect can increase the decay of transmission line.If signal source and transmission line mismatch, the frequency and output work of signal source can have both been influenceed
The stability of rate, signal source can be prevented to obtain whole incident powers from providing peak power, load not only.Therefore transmit
Line must match.
The module be for radio frequency frequency band be 13.56 megahertz of -2.4 gigahertz (GHZ) radio-frequency match module.
Radio frequency expression can be radiated the electromagnetic frequency in space, and frequency range is between 300KHz~300GHz.Radio frequency letter
Claim RF radio frequencies i.e. radio-frequency current, it is a kind of abbreviation of high-frequency ac change electromagnetic wave.Change per second is less than 1000 times
Alternating current is referred to as low-frequency current, is referred to as high frequency electric more than 10000 times, and radio frequency is exactly such a high frequency electric.High frequency
(big 10K)；Radio frequency (300K-300G) is the higher frequency band of high frequency；Microwave frequency band (300M-300G) is the higher-frequency of radio frequency again
Section.
It is general higher using the radio band arrived in general mobile terminal communication, typically often refer to tens to hundreds of megahertzs of frequency
Section, i.e. very high frequency(VHF) (Very High Frequency, VHF) VHF- superfrequencies (Ultra High Frequency, UHF) frequency range.
In a broad sense, microwave refers to the radio wave that frequency is 300MHz-300GHz, its corresponding wave-length coverage in radio-frequency spectrum
It is in 1m~0.1mm；Typically more specifically refer to 1~30GHz frequency ranges, i.e. centimeter wave of the wavelength in cm range.Frequency is higher
Then it is referred to as millimeter wave, submillimeter region.Thus, 800MHz used by the system such as CDMA, GSM in mobile communication,
900MHz frequency ranges belong to radio frequency category, namely uhf band (low side that can also regard microwave as)；And 3G (Third Generation) Moblie 3G
Working frequency range is exactly in microwave range.In the present invention, the radio frequency source of radio-frequency match module is preferably that frequency band is
13.56MHz-2.4GHz the radio band of gigahertz (GHZ).
The radio-frequency match module that it is 900 megahertzs for the frequency of radio frequency that the module, which is,.
Radio frequency system refers generally to its working frequency and is more than 400MHz, and typical working frequency range has：915MHz、2450MHz、
5800MHz etc..Radio frequency system also has numerous international standards to support in these frequency ranges.The basic characteristics of radio frequency system are
Electronic tag and reader cost are higher, the data volume of the interior preservation of label is larger, reading distance is farther out (up to several meters to more than ten
Rice), adapt to objects at high speed Windsor, profile is generally card-like, read antenna and electronic label antenna stronger side
Tropism.Originally in the present invention, the frequency of the radio frequency of radio-frequency match module is preferably 900MHz.
The tie point is capacitive circuit, and when second branch road is inductive circuit, the tie point includes an electricity
Hold, second branch road includes an inductance；Or the tie point is inductive circuit, second branch road is capacitive circuit
When, the tie point includes an inductance, and second branch road includes an electric capacity.
Containing a discrete component substantially inductively or capacitively, wherein inductance and electricity in tie point and the second branch road
Hold does not influence the impedance matching effect that whole radio-frequency match module is finally reached in which branch road.
But the discrete component in the discrete component and the second branch road in tie point can not be simultaneously inductance or be electricity simultaneously
Hold.
As shown in figure 3, when being a kind of radio-frequency match module equivalent circuit diagram of the invention on Smith chart under different situations
The trajectory diagram of match circuit impedance, the calculating punctuate of radio-frequency match module equivalent circuit is carried out using Smith chart：
As shown in figure 4, a kind of schematic equivalent circuit with signal source and load, now circuit, which comprises only, loads ZL
During with signal source, the tracing point shown after being simulated by input radio frequency source in Smith chart is point 1；
As shown in figure 5, a kind of schematic equivalent circuit with signal source, load and inductance, now contains negative in circuit
Carry ZL, an inductance and during signal source, the tracing point shown after being simulated by input radio frequency source on Smith chart is point 2,
Equivalent circuit in the case of only being loaded with respect to before after an inductance is added, and tracing point is on Smith chart from point 1
By moving right the point of arrival 2 counterclockwise.
As shown in fig. 6, a kind of schematic equivalent circuit with signal source, load, inductance and transmission line, contains in circuit
Load ZL, an inductance, the transmission line and signal source that a segment length is 1/8th wavelength when, after being simulated by input radio frequency source
The tracing point shown on Smith chart is puts 3, and equivalent circuit adds one section of transmission line in the case of with respect to before, track
Point on Smith chart from point 2 by moving to a little 3 in clockwise directions, now in equivalent circuit, length is eight points
One of wavelength transmission line serve impedance conversion effect, by display perception point 2 pass through add 1/8th wavelength biography
It is capacitive that impedance is carried out after defeated line and converts the reactive that equivalent circuit now is shown.
Such as Fig. 7, a kind of schematic equivalent circuit with signal source, load, inductance, transmission line and electric capacity, contain in circuit
There is load ZL, an inductance, a segment length for 1/8th wavelength transmission line, an electric capacity and signal source when, pass through input
For the tracing point shown after radio frequency source simulation on Smith chart to put 4, equivalent circuit adds one in the case of with respect to before
Section transmission line, tracing point on Smith chart from point 3 by moving to a little 4 under clockwise direction, point 4 is on Smith chart
Centre point, as impedance matching point, radio-frequency match module completes the task of impedance matching under the equivalent circuit.
By the Smith chart method after above equivalent circuit, the Smith chart after obtaining equivalent circuit after tested shows point
Movement locus, we can be determined that out, and tie point and the second branch road can not have same reactive simultaneously, if first
Road and the second branch road have same reactive simultaneously, then rearmost point 4 is the centre point that can not reach Smith chart, just
The purpose of impedance matching can not be accomplished to.
The tie point is capacitive circuit, when second branch road is inductive circuit, the electric capacity in the tie point
For 221 nanohenry electric capacity, the inductance in second branch road is 9.1 pico farad inductance；Or the tie point is inductive circuit, institute
When to state the second branch road be capacitive circuit, the inductance in the tie point is 9.1 pico farad inductance, the electric capacity in second branch road
For 221 nanohenry electric capacity.
The transmission line is the transmission line with impedance mapping function.
The reactance characteristic of the transmission line is provided simultaneously with inductive and capacitive character.
The fundamental characteristics of transmission line is the transmission delay of characteristic impedance and signal.Transmission line is a distributed parameter system,
Its each section all has distribution capacity, inductance and resistance.The distributed constant of transmission line generally uses the inductance L and list of unit length
Resistance, conductance on the electric capacity C and unit length of bit length represent that electric capacity, inductance and the resistance of distribution are transmission line sheets
The intrinsic parameter of body, gives a certain transmission line, and the value of these parameters also determines that these parameters reflect the interior of transmission line
In factor, the presence of which decides a series of key properties of transmission line.
Advantage of this embodiment is that a kind of new matching network, the pair net are combined into by cabling and discrete component
The structure of network is the cabling of one section of 1/8th wavelength of string between two discrete components in parallel, and the cabling can play impedance change
The effect changed, impedance matching is carried out together with the discrete component in parallel with two.
Embodiment 2
As shown in figure 8, a kind of radio system for mobile terminal, including：RF receiving and transmission module, radio-frequency match module,
Antenna；
The radio-frequency match module is connected between the RF receiving and transmission module and the antenna through its transmission line.
Also include filtration module, the filtration module is located between the radio-frequency match module and the antenna.
Contain radio-frequency match module, radio-frequency match module and RF receiving and transmission module in the radio system for mobile terminal
It is connected, obtains the signal source of radio frequency.Radio-frequency match module is connected with antenna, is loaded equivalent to connection, in whole radio system
Radio-frequency match module act as the task of impedance matching.In general the load impedance for being arranged to radio system is 50 Ω, is passed through
The radio-frequency match of radio-frequency match module make it that coaxial biography conjugate line in whole radio system and load are 50 stable Ω, makes
Under equal conditions effective rate of utilization is higher for radio system, unnecessary loss during less.
Filtration module is located between the radio-frequency match module and the antenna, and filtering harmonics are played in radio system
Effect.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology belonging to the present invention is led
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Claims (10)
- A kind of 1. radio-frequency match module, it is characterised in that including：Tie point, the second branch road and transmission line；The transmission line two End is connected with the tie point of ground connection parallel with one another and second branch road；Wherein, the tie point and described second Both branch roads are the circuit of different reactance characteristics, and the tie point is capacitive circuit or inductive circuit, and second branch road is Inductive circuit or capacitive circuit.
- 2. a kind of radio-frequency match module according to claim 1, it is characterised in that the transmission line is 1/8th wavelength Transmission line.
- 3. a kind of radio-frequency match module according to claim 1, it is characterised in that the module is the frequency for radio frequency Section is the radio-frequency match module of 13.56 megahertz of -2.4 gigahertz (GHZ).
- 4. a kind of radio-frequency match module according to claim 3, it is characterised in that the module is the frequency for radio frequency For 900 megahertzs of radio-frequency match module.
- A kind of 5. radio-frequency match module according to claim 1, it is characterised in that the tie point is capacitive circuit, When second branch road is inductive circuit, the tie point includes an electric capacity, and second branch road includes an inductance；Or The tie point is inductive circuit, and when second branch road is capacitive circuit, the tie point includes an inductance, described Two branch roads include an electric capacity.
- A kind of 6. radio-frequency match module according to claim 5, it is characterised in that the tie point is capacitive circuit, When second branch road is inductive circuit, the electric capacity in the tie point is 221 nanohenry electric capacity, the electricity in second branch road Feel for 9.1 pico farad inductance；Or the tie point is inductive circuit, when second branch road is capacitive circuit, described first Inductance in branch road is 9.1 pico farad inductance, and the electric capacity in second branch road is 221 nanohenry electric capacity.
- 7. a kind of radio-frequency match module according to claim 1, it is characterised in that the transmission line is to be converted with impedance The transmission line of function.
- 8. a kind of radio-frequency match module according to claim 7, it is characterised in that the reactance characteristic of the transmission line is simultaneously Possess inductive and capacitive character.
- A kind of 9. radio system for mobile terminal, it is characterised in that including：RF receiving and transmission module, such as claim 1-8 institutes The radio-frequency match module one of stated, antenna；The radio-frequency match module through its transmission line be connected to the RF receiving and transmission module with Between the antenna.
- 10. a kind of radio system for mobile terminal according to claim 9, it is characterised in that also include filtering mould Block, the filtration module are located between the radio-frequency match module and the antenna.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710755430.8A CN107565991A (en) | 2017-08-29 | 2017-08-29 | A kind of radio-frequency match module, the radio system for mobile terminal |
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| CN201710755430.8A CN107565991A (en) | 2017-08-29 | 2017-08-29 | A kind of radio-frequency match module, the radio system for mobile terminal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107612572A (en) * | 2017-09-08 | 2018-01-19 | 上海斐讯数据通信技术有限公司 | A kind of radio-frequency match module, the radio system for mobile terminal |
| CN112798901A (en) * | 2020-12-29 | 2021-05-14 | 成都沃特塞恩电子技术有限公司 | Equipment calibration system and method |
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| US20100259319A1 (en) * | 2009-04-14 | 2010-10-14 | Qualcomm Incorporated | Low noise amplifier with combined input matching, balun, and transmit/receive switch |
| CN105471404A (en) * | 2014-09-11 | 2016-04-06 | 北京北方微电子基地设备工艺研究中心有限责任公司 | Impedance matching network and plasma processing device |
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| CN1277754A (en) * | 1998-08-28 | 2000-12-20 | 三菱电机株式会社 | Two-frequency impedance matching circuit |
| CN1348619A (en) * | 1999-12-15 | 2002-05-08 | 三菱电机株式会社 | Impedance matching circuit and antenna using impedance matching circuit |
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| CN107612572A (en) * | 2017-09-08 | 2018-01-19 | 上海斐讯数据通信技术有限公司 | A kind of radio-frequency match module, the radio system for mobile terminal |
| CN112798901A (en) * | 2020-12-29 | 2021-05-14 | 成都沃特塞恩电子技术有限公司 | Equipment calibration system and method |
| CN112798901B (en) * | 2020-12-29 | 2023-01-10 | 成都沃特塞恩电子技术有限公司 | Equipment calibration system and method |
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Application publication date: 20180109 |
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| RJ01 | Rejection of invention patent application after publication |