CN202308258U - Power divider integrated with single-frequency band-pass filters - Google Patents
Power divider integrated with single-frequency band-pass filters Download PDFInfo
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- CN202308258U CN202308258U CN2011204265681U CN201120426568U CN202308258U CN 202308258 U CN202308258 U CN 202308258U CN 2011204265681 U CN2011204265681 U CN 2011204265681U CN 201120426568 U CN201120426568 U CN 201120426568U CN 202308258 U CN202308258 U CN 202308258U
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Abstract
The utility model discloses a power divider integrated with single-frequency band-pass filters. The power divider includes an upper layer microstrip structure, an isolation element, an interlayer medium substrate, and a lower layer grounding metal plate. Each power divider integrated with the single-frequency band-pass filters includes two terminal open circuit single frequency band-pass circular filters and the isolation element which is connected between the two terminal open circuit single frequency band-pass circular filters. The input impedance and the output impedance of the power divider integrated with the single-frequency band-pass filters are same. The input and output impedance of each terminal open circuit single frequency band-pass circular filter is times the input impedance or the output impedance of the power divider integrated with the single-frequency band-pass filters. Each terminal open circuit single frequency band-pass circular filter is composed of two U-shaped semi-wavelength resonators which are same in structure. The isolation element can be a resistor, a capacitor, or an inductor. The power divider integrated with the single-frequency band-pass filters can be used in various radio frequency front systems, and has the power division function and the frequency selecting function, thus being beneficial to the integration and miniaturization of a device.
Description
Technical field
The utility model relates to a kind of power divider with filter function, and is particularly a kind of based on the integrated power divider of single band bandpass filter, can be applicable to the power divider of the band filter function of RF front-end circuit.
Background technology
Power divider is the part on a basis in the microwave circuit, because it has the function of separation and composite signal, so almost in all aerial arrays and balancing circuitry, all will use.Because can isolate the frequency band that needs, band pass filter is an another kind of indispensable device in the wireless communication system.These two kinds of devices of power divider and band pass filter exist in many microwave systems simultaneously.
Decades in the past, a large amount of researchs about power divider are arranged.The focus of research is to widen frequency band, reduces area, and double frequency response and harmonic wave suppress.
On the other hand, band pass filter also is an important field of research in the passive circuit design.The single-pass band is two different research directions with comb filter.On the one hand, ultra broadband, harmonic wave suppresses and tunable filter is that single-pass band Design of Bandpass will be considered emphatically.On the other hand, the stepped impedance filter is widely used in the design of many passbands band pass filter.Recently, there are some researches show that again the multifrequency response can be loaded into the resonator center by the open circuit detail and obtain.
In a lot of systems, power divider and filter need link together to realize the function of separation and filtered signal usually.Yet their characteristic own is all just paid attention in the research of all power dividers above-mentioned and filter, and the possibility of considering that both combine is seldom arranged, and uses these two functions of discrete devices realization in traditional system usually.But, can make that with discrete devices the size of module is very big.Therefore, in order to reduce size, double-function device has demand.The double-function device that has separative power signal and frequency selection function has simultaneously had some scholar's research mistakes.At K. J. Song, and Q. Xue, " Novel Ultra-Wideband (UWB) Multilayer Slotline Power Divider With Bandpass Response; " IEEE Microw. Wireless Compon. Lett., vol. 20, and no. 1; Pp. 13-15; Jan, in 2010., the author has accomplished a ultra broadband power divider with band-pass response.The little band slotted line coupling of multilayer is used for separation signal and intercepts the unwanted frequency band.In addition, a kind of Wilkinson power divider design that has the inhibition of band-pass response harmonic concurrently is at document P. Cheong, K. Lai; And K. Tam; " Compact Wilkinson Power Divider with Simultaneous Bandpass Response and Harmonic Suppression, " in 2010 IEEE MTT-S International Microwave Symposium Digest, Snaheim; USA; 2010. in be suggested, this design in, interdigital stepped impedance coupling line is used to realize required function.In addition, at document X. Y. Tang, and K. Mouthaan, " Filter Integrated Wilkinson Power Dividers; " Microwave and Optical Technology Letters, vol. 52, and no. 12; Pp. 2830-2833, Dec mentions in 2010.; Π-type transmission line can be integrated in the power divider, yet, just propose in the article and can be used to realize characteristic with Π-type transmission line rather than real filter.Up to the present, do not occur real filter as yet and be integrated into the device in the power divider,, the utility model provides a kind of novel integrated power divider of single band bandpass filter in order to fill up this blank.
The utility model content
The purpose of the utility model is to overcome the above-mentioned deficiency that prior art exists, the power divider of single band bandpass filter that provides integrated.In the utility model, filter is used as impedance transducer to replace traditional quarter-wave transmission line.Resistance, electric capacity or inductance are connected in the open end of two filters to obtain the good isolation effect as isolated component.Because the specific position that isolating device is put, the structure that is proposed have the less size and the circuit level of enhancing.Because integrated single band bandpass filter in the power divider, so the utility model can be realized the function that power division and frequency are selected simultaneously.
For realizing the utility model purpose, the technical scheme that the utility model adopted is following:
The integrated power divider of single band bandpass filter; Comprise the upper strata microstrip structure, isolated component, intermediate layer medium substrate and lower floor's grounding plate; Upper strata microstrip structure and isolated component are attached to intermediate layer dielectric-slab upper surface, and intermediate layer dielectric-slab lower surface is a grounded metal; It is characterized in that: the upper strata microstrip structure comprises two logical loop filters of terminal open circuit single band; Two terminal logical loop filter structures of open circuit single band are identical; Be arranged into laterally zygomorphic structure; Open circuit single band logical shared input port of loop filter in two terminals is as the input port of the power divider of integrated single band bandpass filter, and the output port of two logical loop filters of terminal open circuit single band is as two output ports of the power divider of integrated single band bandpass filter.
Above-mentioned integrated in the power divider of single band bandpass filter, the logical loop filter of terminal open circuit single band that is positioned at the top is made up of two U type half-wave resonator couplings; The structure of two U type half-wave resonator is identical; The U type half-wave resonator that wherein is connected with input port is connected to form by second microstrip line, first microstrip line and the 3rd microstrip line successively, and the intersection of first microstrip line and the 3rd microstrip line is connected to input port; The U type half-wave resonator that is connected with first output port is connected to form by the 5th microstrip line, the 4th microstrip line and the 6th microstrip line successively, and the intersection of the 4th microstrip line and the 5th microstrip line is connected to first output port; One end of isolated component is connected with the open end of the 6th microstrip line of the logical loop filter of terminal open circuit single band that is positioned at the top, and the other end is connected with the open end of the logical corresponding microstrip line of loop filter of terminal open circuit single band that is positioned at the below.
Above-mentioned integrated in the power divider of single band bandpass filter, the length of U type half-wave resonator
LResonance frequency for the logical loop filter of said terminal open circuit single band
fCorresponding wavelength
λ1/2nd; Wherein,
LBe actual microstrip line length; Actual microstrip line length
LIt is the length sum of first microstrip line, second microstrip line, the 3rd microstrip line.
Above-mentioned integrated in the power divider of single band bandpass filter; Each terminal logical loop filter of open circuit single band has two coupling paths; Wherein, First coupling path is second microstrip line and the 5th microstrip line parallel coupling unit up and down, and second coupling path is the 3rd microstrip line and the 6th microstrip line parallel coupling unit up and down.
The above-mentioned integrated power divider of single band bandpass filter, when U type half-wave resonator resonance, the input end signal and the output end signal of the logical loop filter of terminal open circuit single band have-90 ° phase deviation.
Above-mentioned integrated in the power divider of single band bandpass filter; The input impedance of the power divider of integrated single band bandpass filter is identical with output impedance, and the input impedance of the power divider of the input and output impedance of the logical loop filter of each terminal open circuit single band is integrated single band bandpass filter or
of output impedance are doubly.
Above-mentioned integrated in the power divider of single band bandpass filter, isolated component is resistance, electric capacity or inductance.
With respect to prior art, the utlity model has following advantage river technique effect:
(1) integrated single band bandpass filter in traditional power divider; Can realize the function of power division and trap signal simultaneously; And size has bigger reducing than the module of being made up of the power divider and the filter of separation, helps the integrated and miniaturization of radio-frequency front-end system.
The power divider of (2) integrated single band bandpass filter is by the lower insertion loss of forming than traditional power divider and filter by separation of module.
Description of drawings
The structure chart of the power divider of Fig. 1 is integrated single band bandpass filter.
Fig. 2 a is a terminal open circuit band pass filter sketch map.
Fig. 2 b is the transfer curve figure of terminal open circuit band pass filter.
The structural representation of the power divider of Fig. 3 is integrated single band bandpass filter.
The transfer curve figure of the power divider of Fig. 4 a is integrated single band bandpass filter.
The output return loss and the isolating coefficient curve chart of the power divider of Fig. 4 b is integrated single band bandpass filter.
Embodiment
Below in conjunction with accompanying drawing the utility model is done further detailed explanation, but the utility model requires the scope of protection to be not limited to down the scope of example statement.
As shown in Figure 1; The power divider of integrated single band bandpass filter comprises upper strata microstrip structure, isolated component, intermediate layer medium substrate and lower floor's grounding plate; Upper strata microstrip structure and isolated component are attached to intermediate layer dielectric-slab upper surface, and intermediate layer dielectric-slab lower surface is a grounded metal; The upper strata microstrip structure comprises two logical loop filters of terminal open circuit single band; Two terminal logical loop filter structures of open circuit single band are identical; Be arranged into laterally zygomorphic structure; Open circuit single band logical shared input port of loop filter in two terminals is as the input port of the power divider of integrated single band bandpass filter, and the output port of two logical loop filters of terminal open circuit single band is as two output ports of the power divider of integrated single band bandpass filter; One end of isolated component is connected with the open end of the 6th microstrip line of the logical loop filter of terminal open circuit single band that is positioned at the top, and the other end is connected with the open end of the logical corresponding microstrip line of loop filter of terminal open circuit single band that is positioned at the below, to strengthen isolation.Wherein, isolated component can be resistance, electric capacity or inductance.
Shown in Fig. 2 a, the logical loop filter of each terminal open circuit single band is made up of two U type half-wave resonator couplings; Each U type half-wave resonator structure is identical, is connected and composed by microstrip line; The U type half-wave resonator that is connected with input port is connected to form by second microstrip line 2, first microstrip line 1 and the 3rd little 3 lines of being with successively; The intersection of first microstrip line 1 and the 3rd microstrip line 3 is connected to input port; The U type half-wave resonator that is connected with output port is connected to form by the 5th microstrip line 5, the 4th microstrip line 4 and the 6th microstrip line 6 successively, and the joining of the 4th microstrip line 4 and the 5th microstrip line 5 is connected to output port; The length of U type half-wave resonator
LResonance frequency for the logical loop filter of said terminal open circuit single band
fCorresponding wavelength
λ1/2nd; Wherein,
LBe actual microstrip line length; Actual microstrip line length
LIt is the length sum of first microstrip line 1, second microstrip line 2, the 3rd microstrip line 3; Each terminal logical loop filter of open circuit single band has two coupling paths, and wherein, first coupling path is second microstrip line 2 and the 5th microstrip line parallel coupling unit about in the of 5; Second coupling path is the 3rd microstrip line 3 and the 6th microstrip line parallel coupling unit about in the of 6.
The power divider of integrated single band bandpass filter when U type half-wave resonator resonance, the phase deviation that the input end signal of the logical loop filter of terminal open circuit single band and output end signal have approximately-90 °.The terminal logical loop filter of open circuit single band shown in Fig. 2 a is made up of two U type half-wave resonator.When U type half-wave resonator resonance, there is standing wave on the U type half-wave resonator.When standing wave is propagated through a potential loop, phase deviation-180 °.Between per two antinodes, phase place remains unchanged.Two coupling paths shown in Fig. 2 a are labeled as first coupling path and second coupling path respectively.Letter A indicates the respective nodes of first coupling path from the input port to the output port in order to E.In first coupling path, the B point is the voltage wave antinode, and-180 ° of phase deviations are arranged.Because between B point and C point, do not have voltage node, so the phase deviation of ordering at C also is-180 °.Next, consider that the phase deviation of signal on the open circuit coupling line is-270 °, then the phase deviation of D point signal is-90 °.So, the phase deviation of E point signal also is-90 °.Second coupling path and first coupling path have identical analysis.Wherein A ' is the node of second coupling path to E ' point.E is the same with the phase deviation of E ' node signal.Therefore, the output port signal phase deviation nearly-90 ° with respect to the input port signal.Fig. 2 b is the transmission characteristic and the phase place simulation curve of a band pass filter.Can find out that-91 ° phase deviation is arranged on signal center frequency 1.8GHz, this has embodied-90 ° of phase deviation characteristics of filter.Exactly because filter has-90 ° phase deviation characteristic, therefore can be used for replacing the quarter-wave transmission line used in the conventional power distributor, realize the function of impedance conversion.So; When the input impedance of the power divider of integrated single band bandpass filter was identical with output impedance, the input impedance of the power divider of the input and output impedance of the logical loop filter of each terminal open circuit single band is integrated single band bandpass filter or
of output impedance were doubly.Promptly constitute a typical Wilkinson power divider.
Embodiment
The structure of the power divider of integrated single band bandpass filter is as shown in Figure 1, and relevant dimensions is illustrated in fig. 3 shown below.The thickness of medium substrate is 0.63mm, and relative dielectric constant is 6.15.Be connected two isolated components between the logical loop filter open end of terminal open circuit single band and constitute, to strengthen isolation by 500 ohm the resistance and the inductance element of 39 nanohenrys.As shown in Figure 3, each dimension of microstrip line parameter of the logical loop filter of terminal open circuit single band is following: the electrical length of the 3rd microstrip line 3
θ 1 Be 61.3 °, the electrical length at interval between the open end of the 3rd microstrip line 3 and the 6th microstrip line 6
θ 2 Be 54 °, the 4th microstrip line 4 electrical length
θ 3 It is 45 °.Select these microstrip lines electrical length separately, to obtain transmission characteristic and out-of band rejection characteristic in required input, output impedance characteristic, the frequency band.
Fig. 4 a be of designing according to above-mentioned parameter integrated the actual measured results of transmission characteristic of power divider of single band bandpass filter; Transverse axis among the transfer curve figure is represented frequency, and the longitudinal axis is represented transmission characteristic amplitude, wherein S
11The return loss of the power divider input port of representing the single band bandpass filter integrated, S
21Represent when input port matees the insertion loss from first output port to input port, S
31Represent when input port matees insertion loss from second output port to input port; Actual measurement is to use the E5071C network analyzer to accomplish, and is visible by actual measured results, the insertion damage curve S that actual measurement obtains
21And S
31The basic coincidence, the centre frequency of passband is on 1.78GHz, and the 1dB relative bandwidth that measures is 10.1%, the insertion loss S that on center frequency point 1.78GHz, has comprised the SMA connector that measures
21And S
31Be-3.9dB.Because the integrated cause of filter, the insertion loss of the power of integrated single band bandpass filter will be a bit larger tham the power divider of standard.In passband, the return loss S of the power divider input port of integrated single band bandpass filter
11All be higher than-14dB, and a transmission zero respectively arranged, improved the roll-off characteristic of filter function in the power divider greatly on the passband both sides.Fig. 4 b be of designing according to above-mentioned parameter integrated the actual measured results of transfer curve of power divider of single band bandpass filter; Transverse axis among the transfer curve figure is represented frequency, and the longitudinal axis is represented transmission characteristic, and wherein, S22 representes the return loss plot of first output port, and S23 representes the isolating coefficient of first output port and second output port.The return loss S of first output that arrives of actual measurement wherein
22Be higher than-15dB; On operating frequency point, first output port that actual measurement obtains and the isolating coefficient of second output port are-37dB.
The measured result of embodiment shows that the utility model device has two functions, not only can the mean allocation intake, can also filter out needed frequency range.
The above is merely the preferred embodiments of the utility model; Not in order to restriction the utility model; All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the utility model.
Claims (6)
1. the integrated power divider of single band bandpass filter; Comprise upper strata microstrip structure, isolated component, intermediate layer medium substrate and lower floor's grounding plate; Upper strata microstrip structure and isolated component are attached to intermediate layer dielectric-slab upper surface, and intermediate layer dielectric-slab lower surface is a grounded metal; It is characterized in that: the upper strata microstrip structure comprises two logical loop filters of terminal open circuit single band; The structure of two logical loop filters of terminal open circuit single band is identical; Be arranged into laterally zygomorphic structure; Open circuit single band logical shared input port of loop filter in two terminals is as the input port of the power divider of integrated single band bandpass filter, and the output port of two logical loop filters of terminal open circuit single band is as two output ports of the power divider of integrated single band bandpass filter.
2. according to the said integrated power divider of single band bandpass filter of claim 1, it is characterized in that the logical loop filter of terminal open circuit single band that is positioned at the top is made up of two U type half-wave resonator couplings; The structure of two U type half-wave resonator is identical; The U type half-wave resonator that wherein is connected with input port is connected to form by second microstrip line, first microstrip line and the 3rd microstrip line successively; The intersection of first microstrip line and the 3rd microstrip line is connected to input port; The U type half-wave resonator that is connected with first output port is connected to form by the 5th microstrip line, the 4th microstrip line and the 6th microstrip line successively, and the intersection of the 4th microstrip line and the 5th microstrip line is connected to first output port; One end of isolated component is connected with the open end of the 6th microstrip line of the logical loop filter of terminal open circuit single band that is positioned at the top, and the other end is connected with the open end of the logical corresponding microstrip line of loop filter of terminal open circuit single band that is positioned at the below.
3. according to the said integrated power divider of single band bandpass filter of claim 2, it is characterized in that the length of U type half-wave resonator
LResonance frequency for the logical loop filter of said terminal open circuit single band
fCorresponding wavelength
λ1/2nd; Wherein,
LBe actual microstrip line length; Actual microstrip line length
LIt is the length sum of first microstrip line, second microstrip line and the 3rd microstrip line.
4. according to the said integrated power divider of single band bandpass filter of claim 2; It is characterized in that each terminal logical loop filter of open circuit single band has two coupling paths; Wherein, First coupling path is second microstrip line and the 5th microstrip line parallel coupling unit up and down, and second coupling path is the 3rd microstrip line and the 6th microstrip line parallel coupling unit up and down.
5. according to the said integrated power divider of single band bandpass filter of claim 2; The input impedance of the power divider that it is characterized in that the single band bandpass filter integrated is identical with output impedance, and the input impedance of the power divider of the input and output impedance of the logical loop filter of each terminal open circuit single band is integrated single band bandpass filter or
of output impedance are doubly.
6. according to each described integrated power divider of single band bandpass filter of claim 2 ~ 5, it is characterized in that isolated component is resistance, electric capacity or inductance.
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| CN2011204265681U CN202308258U (en) | 2011-11-02 | 2011-11-02 | Power divider integrated with single-frequency band-pass filters |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832434A (en) * | 2012-08-21 | 2012-12-19 | 华南理工大学 | Equal power splitter integrating band-pass filtering function |
| CN103178319A (en) * | 2013-03-26 | 2013-06-26 | 华南理工大学 | Interdigital coupling duplexer |
| WO2014029182A1 (en) * | 2012-08-21 | 2014-02-27 | 华南理工大学 | Unequal power divider integrated with bandpass filter function |
| CN105098311A (en) * | 2015-08-28 | 2015-11-25 | 华南理工大学 | Unequal power divider with large-range reconfigurable frequency |
| CN110311196A (en) * | 2019-06-18 | 2019-10-08 | 天津大学 | The 5G double-passband filter of suspended substrate stripline is integrated based on medium |
-
2011
- 2011-11-02 CN CN2011204265681U patent/CN202308258U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832434A (en) * | 2012-08-21 | 2012-12-19 | 华南理工大学 | Equal power splitter integrating band-pass filtering function |
| WO2014029182A1 (en) * | 2012-08-21 | 2014-02-27 | 华南理工大学 | Unequal power divider integrated with bandpass filter function |
| CN102832434B (en) * | 2012-08-21 | 2014-10-08 | 华南理工大学 | Equal power splitter integrating band-pass filtering function |
| CN103178319A (en) * | 2013-03-26 | 2013-06-26 | 华南理工大学 | Interdigital coupling duplexer |
| CN105098311A (en) * | 2015-08-28 | 2015-11-25 | 华南理工大学 | Unequal power divider with large-range reconfigurable frequency |
| CN110311196A (en) * | 2019-06-18 | 2019-10-08 | 天津大学 | The 5G double-passband filter of suspended substrate stripline is integrated based on medium |
| CN110311196B (en) * | 2019-06-18 | 2021-02-26 | 天津大学 | 5G dual-passband filter based on dielectric integrated suspension line |
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