CN1236630C - Multi-channel matching network and matching method - Google Patents
Multi-channel matching network and matching method Download PDFInfo
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- CN1236630C CN1236630C CN 02102887 CN02102887A CN1236630C CN 1236630 C CN1236630 C CN 1236630C CN 02102887 CN02102887 CN 02102887 CN 02102887 A CN02102887 A CN 02102887A CN 1236630 C CN1236630 C CN 1236630C
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Abstract
The present invention relates to a multi-channel matching network and a matching method, which is used to form a signal path between a first element and a second element to transfer radio frequency signals in a high frequency band and a low frequency band, wherein at least one of the first element and the second element is an active element which comprises a high frequency priority element group and a low frequency priority element group which are connected in series, wherein the multi-channel matching network is matched with predetermined impedance and load impedance when the multi-channel matching network is at the high frequency band and the low frequency band simultaneously. Two element groups are used by the present invention, so that when the multi-channel matching network is at the high frequency band and the low frequency band, the multi-channel matching network can not form two loci with lengths with few differences on a Smith chart. Thus, unstable phenomenon generated when the property of elements in the element groups changes (or drifts) is avoided, and matching stability is enhanced.
Description
Technical field
The present invention relates to a kind of circuit that is used for wireless telecommunications, especially finger is a kind of can work in multichannel simultaneously, such as person-to-person communication service (personal communication service, 900MHz channel PCS) and the multi-channel matching network and the matching process of 1.8GHz channel.
Background technology
In present society, the increase that mobile phone (cellular telephone) and other wireless communication services continue always.And, many wireless systems also all program operation at several channels.For example, nearest pcs system is to use two channels, and the centre frequency of a channel is 900MHz, is commonly referred to as the GSM channel; Another centre frequency then is similar to 1.8MHz, is commonly referred to as the DCS channel.Certainly, the wireless system that uses other different channels is also arranged.These wireless systems have just facilitated mobile phone or must there be the ability of working the mobile terminal in multichannel.
In order to reduce cost and complexity at the radio circuit of leading portion (front end), most circuit designers is all expected to design single signalling channel, simultaneously can transmit the radiofrequency signal that is positioned at several channels, for example, the signal among transmission simultaneously or reception 900MHz and the 1.8GHz.So, no matter be antenna (antenna), low noise amplifier (low noise amplifier, LNA), high frequency power amplifier (high-frequency power amplifier, HPA) or matching network therebetween (matching network) etc., all wish to be designed to single one, and be compatible to multichannel.
United States Patent (USP) numbers the 6th, 078, No. 794 and the 5th, 995, No. 814 patent provides two different multi-channel matching networks, still, is subject to circuit framework and element characteristic, lack a kind of design concept simultaneously, design the matching network that really meets multichannel coupling and enough frequency range and be suitable difficulty.
Summary of the invention
The present invention proposes a kind of multichannel (multiple frequency band) matching network (matching network).This multichannel forms a signal path (path) to be delivered in radio frequency (radio frequency, RF) signal in a high channel (high frequency band) and the low channel (low frequency band) with matching network.This multi-channel matching network when this high channel and this low channel, mates a predetermined impedance and a load impedance simultaneously.This predetermined impedance can be an output impedance of a signal source, or a specific optimum impedance.This multi-channel matching network includes a high-frequency priority elements group (high frequency leading matching subset) and a low frequency priority elements group (low frequency leading matching subset) that is in series.
When being longer than it and being arranged in low channel, the length of the formed track of a Smith chart (Smith Chart) forms the length of track (locus) when wherein this high-frequency priority elements group is arranged in high channel at Smith chart; And when being arranged in low channel, this low frequency priority elements group when the length of the formed track of a Smith chart (Smith Chart) is longer than it and is arranged in high channel, forms the length of track (locus) at Smith chart; Wherein said high-frequency priority elements group comparatively helps this high-frequency coupling, and described low frequency priority elements group comparatively helps this low-frequency coupling.
This high-frequency priority elements group includes a series connection inductance (series inductor) and an electric capacity in parallel (shunt capacitor).This low frequency priority elements group includes a series connection electric capacity (seriescapacitor) and an inductance in parallel (shunt inductor).
This high-frequency priority elements group or this low frequency priority elements group can be L type second order (two-element), π type three rank (three-element), T type three rank or notch cuttype network.
Two cover element groups can be looked circuit requirements in this signal path, order can be exchanged before and after it.
Utilize two cover element groups, two path lengths that make this multi-channel matching network form on Smith chart when this high channel and this low channel can not differ too big.So, can exempt the wild effect that is produced when element characteristic changes in these element groups (or drift), increase the stability of coupling.
Utilize above formed this high-frequency priority elements group of (not comprising second order) network of second order or this low frequency priority elements group can effectively adjust quality factor (Q factor), so that the frequency range of whole multi-channel matching network meets demand.
The present invention provides a kind of multichannel matching process in addition, is used for a high channel and a low channel, mates an output impedance and a load impedance.This method includes: in the signal path between this output impedance and this load impedance, provide a high-frequency priority elements group; And in this signal path, provide a low frequency priority elements group, be connected in series mutually with this high-frequency priority elements group; When being longer than it and being arranged in low channel, the length of the formed track of a Smith chart forms the length of track when wherein this high-frequency priority elements group is arranged in high channel at Smith chart; And when being arranged in low channel, this low frequency priority elements group when the length of the formed track of a Smith chart is longer than it and is arranged in high channel, forms the length of track at Smith chart; Wherein said high-frequency priority elements group comparatively helps this high-frequency coupling, and described low frequency priority elements group comparatively helps this low-frequency coupling.
Description of drawings
Fig. 1 a and Fig. 1 b are the circuit system figure of use multi-channel matching network of the present invention;
Fig. 2 a is the Organization Chart of a multi-channel matching network of the present invention;
Fig. 2 b is the enforcement circuit diagram among Fig. 2 a;
Fig. 2 c has shown the track of multi-channel matching network on a Smith chart of Fig. 2 b;
Fig. 3 a is the Organization Chart of another multi-channel matching network of the present invention;
Fig. 3 b is the enforcement circuit diagram among Fig. 3 a;
Fig. 3 c has shown the track of multi-channel matching network on a Smith chart of Fig. 3 b;
Fig. 4 a is the Organization Chart of another multi-channel matching network of the present invention;
Fig. 4 b is the enforcement circuit diagram among Fig. 4 a;
Fig. 4 c has shown the track of multi-channel matching network on a Smith chart of Fig. 4 b;
Fig. 5 a is the Organization Chart of another multi-channel matching network of the present invention;
Fig. 5 b is the enforcement circuit diagram among Fig. 5 a;
Fig. 5 c has shown the track of multi-channel matching network on a Smith chart of Fig. 5 b;
Fig. 6 is the breadboardin result of the multi-channel matching network among Fig. 2 b;
Fig. 7 is the breadboardin result of the multi-channel matching network among Fig. 5 b; And
Fig. 8 a to Fig. 8 c is three kinds of circuit system figures with the multi-channel matching network that can adjust the Q function.
Embodiment
Following the present invention will be embodiment with the multi-channel matching network of coupling GSM channel and DCS channel.Yet the present invention is not limited to any specific channel, amplifier or communication system.The matching network that need mate two or more channels simultaneously all can be used the invention process.Protection scope of the present invention is worked as with being as the criterion that claims were defined.
Fig. 1 a is the circuit system figure of use multi-channel matching network of the present invention.Multi-channel matching network 10 is located at an impedance load R
LAn and signal source V
SAn output impedance R
SBetween.The purpose of matching network 10 is to provide a signalling channel, makes V
SIn, the RF signal that is positioned at GSM channel and DCS channel can effectively be sent to R
LFor example: R
LCan be equiva lent impedance, the V of antenna
SWith R
SCan be respectively dummy source and the equivalent output resistance of HPA; R
LCan be equivalent input impedance, the V of LNA
SWith R
SCan be respectively the dummy source and the equivalent output resistance of antenna.Matching network of the present invention can place before or after the active member, for example between LNA and the frequency mixer, between low noise amplifier and the antenna, between power amplifier and the antenna, between the two stage power amplifier, between modulator and the amplifier and between frequency mixer and the demodulator or the like, and can be used as duplexer or filter.Fig. 1 b represents that then multi-channel matching network of the present invention is in a load impedance R
LBe converted to a specific optimum impedance R
Opt, as the matching network design requirement of same power amplifier.
First embodiment
Fig. 2 a is the Organization Chart of a multi-channel matching network of the present invention.Fig. 2 b figure is the enforcement circuit diagram among Fig. 2 a.Multi-channel matching network among Fig. 2 a includes the element group of two series connection: high-frequency priority elements group 410 and low frequency priority elements group 450.High-frequency priority elements group 410 is coupled to contact 130, and low frequency priority elements group 450 is coupled to contact 150.Below the 1st table during for coupling GSM channel and DCS channel, element among Fig. 2 b and R
S, R
LComponent value.
The 1st table
| Component symbol | L 1 | L 2 | C 1 | C 2 | R S | R L |
| Component value | 1.007nH | 4.045nH | 8.639pF | 7.411pF | 50ohm | 5ohm |
High-frequency priority elements group 410 is a L type second order network, includes a series inductance L
1An and capacitor C in parallel
1Shown in the Smith chart among Fig. 2 C (Smith chart), high-frequency priority elements group 410 is D-E at the formed track of GSM channel
1-F
1, and be D-E at the formed track of DCS channel
2-F
2By Fig. 2 C as can be known, D-E
1-F
1Total length less than D-E
2-F
2Total length, and F
1Than F
2It is far away that the complete match point (initial point) of distance expectation comes.Point on the Smith chart is near more apart from initial point, and expression RF signal reflex is few more, and matching effect is good more.As seen, high-frequency priority elements group 410 compared with when the low channel of GSM, has preferable matching effect, so be called high-frequency priority elements group when the high channel of DCS.
Low frequency priority elements group 450 is a L type second order network, includes a series capacitance C
2An and inductance L in parallel
2Shown in the Smith chart among Fig. 2 C, low frequency priority elements group 450 is F at the formed track of GSM channel
1-G
1--H, and be F at the formed track of DCS channel
2-G
2--H.F
1-G
1--the path length of H, greater than F
2-G
2--the path length of H.Though starting point (the match point F when the GSM channel
1) than starting point (the match point F when the DCS channel
2) come far away, still, the match point that low frequency priority elements group 450 makes in Smith chart with respect to the GSM channel, the fast characteristic that mobile ratio comes with respect to the match point of DCS channel, balance the result that produced of previous high-frequency priority elements group 410.In other words, the matching effect that low frequency priority elements group 450 is tended to than low channel is so be called low frequency priority elements group.Therefore, the track of two channels (GSM channel and DCS channel) has all arrived initial point at last, and match point has completely just reached the purpose of multifrequency coupling.
Fig. 6 is the breadboardin result of the multi-channel matching network among Fig. 2 b.Wherein have the curve representation frequency response (frequency response) of open circles, have the curve representation frequency decay of filled circles.As seen from the figure, when 900MHz channel and 1.8GHz channel, the RF signal almost can pass through (or decay very little) completely, meets the demand of multichannel coupling.
Second embodiment
Fig. 3 a is the Organization Chart of another multi-channel matching network of the present invention.Fig. 3 b is the enforcement circuit diagram among Fig. 3 a.Multi-channel matching network among Fig. 3 a includes the element group of two series connection: low frequency priority elements group 411 and high-frequency priority elements group 451.High-frequency priority elements group 451 is coupled to contact 150; Low frequency priority elements group 411 is coupled to contact 130.Below the 2nd table during for coupling GSM channel and DCS channel, element among Fig. 3 b and R
S, R
LComponent value.
The 2nd table
| Component symbol | L 1 | L 2 | C 1 | C 2 | R S | R L |
| Component value | 1.901nH | 2.196nH | 15.95pF | 3.95pF | 50ohm | 5ohm |
Low frequency priority elements group 411 is a L type second order network, includes a series capacitance C
1An and inductance L in parallel
1Shown in the Smith chart among Fig. 3 C, low frequency priority elements group 411 is D-E at the formed track of GSM channel
1-F
1, and be D-E at the formed track of DCS channel
2-F
2By Fig. 3 C as can be known, D-E
1-F
1Total length be higher than D-E
2-F
2Total length, and F
1Than F
2It is near that the complete match point (initial point) of distance expectation comes.As seen, low frequency priority elements group 411 compared with when the high channel of DCS, has preferable matching effect, so be called low frequency priority elements group when the low channel of GSM.
High-frequency priority elements group 451 is a L type second order network, includes a shunt capacitance C
2And one the series connection inductance L
2Shown in the Smith chart among Fig. 3 C, high-frequency priority elements group 451 is F at the formed track of GSM channel
1-G
1--H, and be F at the formed track of DCS channel
2-G
2--H.F
1-G
1--the path length of H, greater than F
2-G
2--the path length of H.Though starting point (the match point F when the GSM channel
1) than starting point (the match point F when the DCS channel
2) come near, still, the match point that high-frequency priority elements group 451 makes in Smith chart with respect to the GSM channel, the slow characteristic that mobile ratio comes with respect to the match point of DCS channel, balance the result that produced of previous low frequency priority elements group 411.In other words, high-frequency priority elements group 451 is tended to the matching effect of higher channel, so be called high-frequency priority elements group.Therefore, the track of two channels (GSM channel and DCS channel) has all arrived initial point at last, and match point has completely just reached the purpose of multifrequency coupling.
When a matching network used L type second order network, it had the degree of freedom of two dimension, but only had only a kind of coupling that may be able to reach a channel that makes up.So the quality factor of matching network (qualityfactor is called for short Q) can't be adjusted.When the matching network use had the quadravalence network of four elements, it had the four-dimensional degree of freedom, but only had only a kind of coupling that may be able to reach two channels that makes up, and also can't adjust so its Q is the same.Though the multi-channel matching network among first embodiment and second embodiment has met the demand of multichannel coupling,, its Q (having represented the frequency range of matching network) fixes along with the matching network structure, but demand that not necessarily can the coincident circuit designer.
High-frequency priority elements group among the present invention and low frequency priority elements group one of them, can use the above network in three rank or three rank, in order to adjusting the Q of whole multi-channel matching network, and reach the frequency range demand of circuit designers.The above network in three rank or three rank can be π type three rank, T type three rank or notch cuttype network.
The 3rd embodiment
Fig. 4 a is the Organization Chart of a multi-channel matching network of the present invention.Fig. 4 b is the enforcement circuit diagram among Fig. 4 a.Multi-channel matching network among Fig. 4 a includes the element group of two series connection: low frequency priority elements group (Q-modified and low frequency leading matching subset) 421 and the high-frequency priority elements group 461 that can adjust Q.The low frequency priority elements group 421 that can adjust Q is coupled to contact 130, and high-frequency priority elements group 461 is coupled to contact 150.Below the 3rd table element and R among Fig. 2 b during for coupling GSM channel and DCS channel
S, R
LComponent value.
The 3rd table
| Component symbol | L 1 | L 2 | L 3 | C 1 | C 2 | R S | R L |
| Component value | 0.1057nH | 0.7722nH | 0.5609nH | 29.761pF | 14.88Pf | 50ohm | 25ohm |
The low frequency priority elements group 421 that can adjust Q is a π type three rank networks, includes a capacitor C in parallel
1, one the series connection inductance L
1An and inductance L in parallel
3Shown in the Smith chart among Fig. 4 c, the low frequency priority elements group 421 that can adjust Q is D-E at the formed track of GSM channel
1-F
1-G
1, and be D-E at the formed track of DCS channel
2-F
2-G
2By Fig. 4 c as can be known, D-E
1-F
1-G
1Total length be longer than D-E
2-F
2-G
2Total length, and G
1Than G
2It is near that the complete match point (initial point) of distance expectation comes.As seen, the low frequency priority elements group 421 that can adjust Q compared with when the high channel of DCS, has preferable matching effect, so be called low frequency priority elements group when the low channel of GSM.C
1Make the track of two channels all reached Smith chart than outer peripheral areas (zone) with higher Q.So, can expect that whole multi-channel matching network will have higher Q, promptly have narrower frequency range.
High-frequency priority elements group 461 is a L type second order network, includes a shunt capacitance C
2And one the series connection inductance L
2Shown in the Smith chart among Fig. 4 c, high-frequency priority elements group 461 is G at the formed track of GSM channel
1--H
1-I, and be G at the formed track of DCS channel
2--H
2-I.G
1--H
1The path length of-I is shorter than G
2--H
2The path length of-I.Though starting point (the match point G when the GSM channel
1) than starting point (the match point G when the DCS channel
2) come near, but, the match point that this frequency priority elements group 461 makes in Smith chart with respect to the GSM channel, the slow characteristic that mobile ratio comes with respect to the match point of DCS channel, balance before can adjust the result that the low frequency priority elements group 421 of Q is produced.In other words, high-frequency priority elements group 461 is tended to the matching effect of higher channel, so be called high-frequency priority elements group.Therefore, the track of two channels (GSM channel and DCS channel) has all arrived the initial point in the Smith chart at last, and match point has completely just reached the purpose of multifrequency coupling.
The 4th embodiment
Fig. 5 a is the Organization Chart of a multi-channel matching network of the present invention.Fig. 5 b is the enforcement circuit diagram among Fig. 5 a.Multichannel matching network among Fig. 5 a includes the element group of two series connection: low frequency priority elements group (Q-modified and low frequency leading matching subset) 521 and the high-frequency priority elements group 561 that can adjust Q.The low frequency priority elements group 521 that can adjust Q is coupled to contact 130, and high-frequency priority elements group 561 is coupled to contact 150.Below the 4th table during for coupling GSM channel and DCS channel, element among Fig. 5 b and R
S, R
LComponent value.
The 4th table
| Component symbol | L 1 | L 2 | L 3 | C 1P | C 2S | C 2 | R S | R L |
| Component value | 0.118nH | 0.773nH | 0.537nH | 65.38pF | 52.9Pf | 14.62pF | 50ohm | 5ohm |
The low frequency priority elements group 521 that can adjust Q is a quadravalence network, includes a capacitor C in parallel
1P, one the series connection capacitor C
1S, one the series connection inductance L
1An and inductance L in parallel
3Shown in the Smith chart among Fig. 5 c, the low frequency priority elements group 521 that can adjust Q is D-E at the formed track of GSM channel
1-F
1-G
1, and be D-E at the formed track of DCS channel
2-F
2-G
2By Fig. 4 c as can be known, D-E
1-F
1-G
1Total length be longer than D-E
2-F
2-G
2Total length, and G
1Than G
2It is near that the complete match point (initial point) of distance expectation comes.As seen, the low frequency priority elements group 521 that can adjust Q compared with when the high channel of DCS, has preferable matching effect, so be called low frequency priority elements group when the low channel of GSM.Simultaneously, C
1PWith C
1SMake the track of two channels all reached Smith chart than outer peripheral areas (zone) with higher Q.So, can expect that whole multi-channel matching network will have higher Q, promptly have narrower frequency range.
High-frequency priority elements group 561 is a L type second order network, includes a shunt capacitance C
2And one the series connection inductance L
2Shown in the Smith chart among Fig. 5 c, high-frequency priority elements group 561 is G at the formed track of GSM channel
1--H-I, and be G at the formed track of DCS channel
2--H
2-I.G
1--H
1The path length of-I is shorter than G
2--H
2The path length of-I.Though starting point (the match point G when the GSM channel
1) than starting point (the match point G when the DCS channel
2) come near, but, the match point that high-frequency priority elements group 561 makes in Smith chart with respect to the GSM channel, the slow characteristic that mobile ratio comes with respect to the match point of DCS channel, balance before can adjust the result that the low frequency priority elements group 521 of Q is produced.In other words, high-frequency priority elements group 561 is tended to the matching effect of higher channel, so be called high-frequency priority elements group.Therefore, the track of two channels (GSM channel and DCS channel) has all arrived the initial point in the Smith chart at last, and match point has completely just reached the purpose of multifrequency coupling.
Fig. 7 is the breadboardin result of the multi-channel matching network among Fig. 5 b.Wherein have the curve representation frequency response (frequency response) of open circles, have the curve representation frequency decay of filled circles.As seen from the figure, when 900MHZ channel and 1.8GHZ channel, the RF signal almost can pass through (or decay very little) completely, meets the demand of multichannel coupling.And, by after the comparison of Fig. 7 and Fig. 6 as can be known, though the result of Fig. 7 and Fig. 6 has all met the multichannel coupling, the multi-channel matching network that Fig. 7 demonstrates among Fig. 5 b has narrower frequency range, the noise that can more effectively filter other channels and brought.
The embodiment that other are possible
The function of adjusting Q has more than limit and is reached by the low frequency priority elements group that is coupled to contact 130, also can be reached by high-frequency priority elements group.Fig. 8 a to Fig. 8 C is three kinds of circuit system figures with the multi-channel matching network that can adjust the Q function.Shown in figure, high-frequency priority elements group and low frequency priority elements group can be exchanged arbitrarily, and the function of adjustment Q can be finished by any one element group.
Utilize high-frequency priority elements group and low frequency priority elements group, multi-channel matching network of the present invention corresponds to two path lengths of two different channels will be similar.This means that multi-channel matching network for the wherein component value change of element, has preferable tolerance, therefore, also has preferable product yield.Simultaneously, the function of adjustment Q can be so that go for the wideband or the network application of narrow frequency in the multi-channel matching network of the present invention.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limiting the present invention, anyly has the knack of this skill person, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention defines and is as the criterion when looking the accompanying Claim book.
Claims (23)
1. multi-channel matching network, it is characterized in that: in order between first element and second element, to form a signal path to be delivered in the radiofrequency signal in a high channel and the low channel, wherein have at least one to be active member in this first element and second element, this active member comprises:
A high-frequency priority elements group that is in series and a low frequency priority elements group;
Wherein, this multi-channel matching network when this high channel and this low channel, mates a predetermined impedance and a load impedance simultaneously; When being longer than it and being arranged in low channel, the length of the formed track of a Smith chart forms the length of track when wherein this high-frequency priority elements group is arranged in high channel at Smith chart; And when being arranged in low channel, this low frequency priority elements group when the length of the formed track of a Smith chart is longer than it and is arranged in high channel, forms the length of track at Smith chart; Wherein said high-frequency priority elements group comparatively helps this high-frequency coupling, and described low frequency priority elements group comparatively helps this low-frequency coupling.
2. multi-channel matching network as claimed in claim 1 is characterized in that: this high-frequency priority elements group is L type second order, π type three rank, T type three rank or notch cuttype network.
3. multi-channel matching network as claimed in claim 1 is characterized in that: this low frequency priority elements group is L type second order, π type three rank, T type three rank or notch cuttype network.
4. multi-channel matching network as claimed in claim 1 is characterized in that: in this signal path, this high-frequency priority elements group is positioned at before this low frequency priority elements group.
5. multi-channel matching network as claimed in claim 1 is characterized in that: in this signal path, this low frequency priority elements group is positioned at before this high-frequency priority elements group.
6. multi-channel matching network as claimed in claim 1 is characterized in that: this high-frequency priority elements group includes a series connection inductance and an electric capacity in parallel.
7. multi-channel matching network as claimed in claim 1 is characterized in that: this low frequency priority elements group includes a series connection electric capacity and an inductance in parallel.
8. multi-channel matching network as claimed in claim 1 is characterized in that: this high-frequency priority elements group is the adjustable element group of a quality factor.
9. multi-channel matching network as claimed in claim 1 is characterized in that: this low frequency priority elements group is the adjustable element group of a quality factor.
10. multi-channel matching network as claimed in claim 1 is characterized in that: this high channel approximately is the center with 1.8GHZ, and this low channel approximately is the center with 900MHz.
11. multi-channel matching network as claimed in claim 1 is characterized in that: this first element and this second element are respectively a low noise amplifier and an antenna.
12. multi-channel matching network as claimed in claim 1 is characterized in that: this first element and this second element are respectively a power amplifier and an antenna.
13. multi-channel matching network as claimed in claim 1 is characterized in that: this first element and this second element are respectively a low noise amplifier and a frequency mixer.
14. multi-channel matching network as claimed in claim 1 is characterized in that: this first element and this second element are power amplifier.
15. multi-channel matching network as claimed in claim 1 is characterized in that: this first element and this second element are respectively a modulator and an amplifier.
16. multi-channel matching network as claimed in claim 1 is characterized in that: this first element and this second element are respectively a frequency mixer and a demodulator.
17. multi-channel matching network as claimed in claim 1 is characterized in that: this multifrequency matching network is as duplexer or filter.
18. a multichannel matching process is characterized in that: be used for a high channel and a low channel, mate a predetermined impedance and a load impedance, this method includes:
In the signal path between this output impedance and this load impedance, provide a high-frequency priority elements group; And
In this signal path, a low frequency priority elements group is provided, be connected in series mutually with this high-frequency priority elements group; When being longer than it and being arranged in low channel, the length of the formed track of a Smith chart forms the length of track when wherein this high-frequency priority elements group is arranged in high channel at Smith chart; And when being arranged in low channel, this low frequency priority elements group when the length of the formed track of a Smith chart is longer than it and is arranged in high channel, forms the length of track at Smith chart; Wherein said high-frequency priority elements group comparatively helps this high-frequency coupling, and described low frequency priority elements group comparatively helps this low-frequency coupling.
19. multichannel matching process as claimed in claim 18 is characterized in that: this high channel approximately is the center with 1.8GHZ, and what this low channel was big is the center with 900MHZ.
20. multichannel matching process as claimed in claim 18 is characterized in that: provide in the step of this high-frequency priority elements group, include a following step:
Provide an electric capacity in parallel and a series connection inductance in this signal path.
21. multichannel matching process as claimed in claim 20 is characterized in that: provide in the step of this high-frequency priority elements group, other includes a following step:
Provide an inductance in parallel or a series connection electric capacity in this signal path, to adjust a quality factor.
22. multichannel matching process as claimed in claim 18 is characterized in that: provide in the step of this low frequency priority elements group, include a following step:
Provide an inductance in parallel and a series connection electric capacity in this signal path.
23. multichannel matching process as claimed in claim 22 is characterized in that: provide in the step of this low frequency priority elements group, include a following step:
Provide a series connection inductance or an electric capacity in parallel in this signal path, to adjust a quality factor.
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|---|---|---|---|
| CN 02102887 CN1236630C (en) | 2002-01-29 | 2002-01-29 | Multi-channel matching network and matching method |
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|---|---|---|---|
| CN 02102887 CN1236630C (en) | 2002-01-29 | 2002-01-29 | Multi-channel matching network and matching method |
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|---|---|
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| CN1236630C true CN1236630C (en) | 2006-01-11 |
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| CN100397798C (en) * | 2004-11-08 | 2008-06-25 | 佛山市顺德区顺达电脑厂有限公司 | Impedance matching circuit of multi-frequency antenna |
| CN107093995A (en) * | 2008-04-25 | 2017-08-25 | 维斯普瑞公司 | Tunable matching network circuit topology is selected |
| CN102075158A (en) * | 2010-12-29 | 2011-05-25 | 重庆邮电大学 | Method for designing ultra wideband impedance matching network |
| CN103151621B (en) * | 2013-03-06 | 2015-12-09 | Tcl通讯（宁波）有限公司 | A kind of four-in-one mobile terminal antenna device |
| CN106982077A (en) * | 2017-05-24 | 2017-07-25 | 上海传英信息技术有限公司 | The signal input circuit and mobile terminal of duplexer filter |
| CN111211801A (en) * | 2019-11-28 | 2020-05-29 | 天津大学 | Flexible T-shaped radio frequency matching circuit and manufacturing method thereof |
-
2002
- 2002-01-29 CN CN 02102887 patent/CN1236630C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1436008A (en) | 2003-08-13 |
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