CN102832434B - Equal power splitter integrating band-pass filtering function - Google Patents
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- CN102832434B CN102832434B CN201210298383.6A CN201210298383A CN102832434B CN 102832434 B CN102832434 B CN 102832434B CN 201210298383 A CN201210298383 A CN 201210298383A CN 102832434 B CN102832434 B CN 102832434B
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Abstract
The invention discloses an equal power splitter integrating a band-pass filtering function. The equal power splitter integrating the band-pass filtering function comprises an upper micro-strip structure, an isolation component, an intermediate medium substrate and a lower grounded metal plate. Each equal power splitter integrating the band-pass filtering function comprises two single-frequency band-pass filter circuits and the isolation component connected between the two single-frequency band-pass filter circuits. Input impedance and output impedance of the equal power splitter integrating the band-pass filtering function are the same, input and output impedance of each single-frequency band-pass filter circuit can be adjusted by changing coupling strength among resonators and port positions so as to perform power splitting and realize match, and each single-frequency band-pass filter circuit is composed of three quarter-wave resonators by coupling. The equal power splitter integrating the band-pass filtering function can be used for various radio-frequency front end systems, has power splitting and frequency selection functions, is smaller in size than filter circuits and a power splitter which are in cascade connection and is beneficial to integration and miniaturization of devices.
Description
Technical Field
The present invention relates to a power divider with filtering function, and more particularly, to an equal-division power divider with integrated band-pass filtering function for rf front-end circuit.
Background
Power dividers are a fundamental part of microwave circuits and are used in many antenna arrays and balanced circuits because of their ability to separate and combine signals. The band pass filter circuit is another indispensable part of the wireless communication system because it can separate a desired frequency band. Both of these elements are present in many microwave systems.
Over the past several decades, there has been a great deal of research on power splitters. The focus of research is on broadening the band, reducing the area, dual frequency response and harmonic rejection. Meanwhile, the band-pass filter circuit is also an important research field in passive circuit design. Single-passband and multi-passband filter circuits are two different directions of research. The research focuses on the aspects of reducing the volume, improving the frequency selectivity, flexibly controlling the working frequency and the bandwidth of a plurality of pass bands, increasing the transmission zero point and the like.
In many rf subsystems, the power splitter and the filter circuit are typically connected together to perform the functions of separating and filtering the signals. However, all the above mentioned studies of power dividers and filter circuits only focus on their own characteristics, and there are few possibilities to consider the combination of the two. Conventional systems typically employ discrete devices to perform both functions. However, such dimensions can be large. The single device with double functions can simultaneously have two functions, and can meet the requirement of miniaturization. Dual function devices with both splitting/combining power signals and frequency selection have been studied by several researchers. In K.J. Song, and Q.Xue, "Novel Ultra-wideband (UWB)" multilayered slotted Power Divider With band pass Response, "IEEE micro. Wireless Compound. Lett., vol.20, No. 1, pp. 13-15, Jan, 2010, the authors completed an Ultra-wideband Power Divider With Bandpass counterparts. Multi-layer microstrip slotline coupling is used to separate/combine signals and block unwanted frequency bands. Furthermore, a Wilkinson Power Divider design with both Bandpass Response and Harmonic Suppression is proposed in the documents 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 this design, interdigitated stepped impedance coupled lines are used to implement the function. In addition, pi-type transmission lines can be Integrated into the Power divider as mentioned in the documents x.y. Tang, and k. mouthan, "Filter Integrated Wilkinson Power Dividers," Microwave and Optical Technology Letters, vol.52, No. 12, pp. 2830, 2833, Dec, 2010, however, only pi-type transmission lines are used in the article, whose filtering function is to be improved. In order to fill the gap, the invention provides a novel equal-division power divider integrating a band-pass filtering function.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides the equal-division power divider integrating the band-pass filtering function. In the present invention, a single frequency bandpass filter circuit is used as an impedance transformer to replace the conventional quarter-wavelength transmission line. The resistor, the capacitor or the inductor is used as an isolation element and connected to the open ends of the two single-frequency band-pass filter circuits so as to obtain a good isolation effect. The proposed structure has a smaller size because of the special position of the placement of the isolation devices, which can improve the integration level of the circuit. Because the single-frequency band-pass filter circuit is integrated in the power divider, the functions of power division and frequency selection can be realized simultaneously.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
the equal power divider integrating the band-pass filtering function comprises an upper-layer microstrip structure, an isolation element, a middle-layer dielectric substrate and a lower-layer grounding metal plate, wherein the upper-layer microstrip structure is attached to the upper surface of the middle-layer dielectric plate, and the lower surface of the middle-layer dielectric plate is made of grounding metal; the method is characterized in that: the upper-layer microstrip structure comprises two single-frequency band-pass filter circuits which are the same in structure and are arranged in an up-and-down symmetrical structure, the two single-frequency band-pass filter circuits share one input port to serve as the input port I/P of the equal-division power distributor with the integrated band-pass filter function, and the output ports of the two single-frequency band-pass filter circuits serve as the first output port O/P1 and the second output port O/P2 of the equal-division power distributor with the integrated band-pass filter function.
In the power divider with the integrated band-pass filtering function, the single-frequency band-pass filtering circuit positioned above the power divider is formed by coupling three quarter-wavelength resonators, namely a first resonator, a second resonator and a third resonator; the first resonator is a microstrip line with an open circuit at the starting end and a grounded tail end, and the microstrip line consists of a first microstrip line, a second microstrip line, a third microstrip line and a fourth microstrip line which are connected in sequence; the second resonator is a microstrip line with a grounded initial end and an open tail end, and the microstrip line consists of a fifth microstrip line, a sixth microstrip line, a seventh microstrip line, an eighth microstrip line, a ninth microstrip line and a tenth microstrip line which are connected in sequence; the third resonator is a microstrip line with a grounded initial end and an open tail end, and the microstrip line consists of an eleventh microstrip line, a twelfth microstrip line, a thirteenth microstrip line and a fourteenth microstrip line which are connected in sequence; the second microstrip line is coupled with the thirteenth microstrip line, the third microstrip line is coupled with the twelfth microstrip line, the fourth microstrip line is coupled with the fifth microstrip line, and one end of the fifth microstrip line is coupled with one end of the eleventh microstrip line; the open end of the first resonator is connected with the input port I/P, and the thirteen microstrip lines of the third resonator are connected with the first output port O/P; one end of the isolation element is connected with the open end of the second resonator positioned above, and the other end of the isolation element is connected with the open end of the corresponding resonator of the single-frequency band-pass filter circuit positioned below.
The above-mentioned equal power divider with integrated band-pass filtering function, length of quarter-wave resonatorLIs the resonance frequency of the single-frequency band-pass filter circuitfCorresponding wavelengthλOne fourth of (a); wherein,Lis the actual microstrip line length.
According to the equal power divider integrating the band-pass filtering function, the left transmission zero point and the right transmission zero point of the passband of the single-frequency band-pass filtering circuit are generated by cross coupling among the resonators.
According to the equal power divider integrating the band-pass filtering function, the input impedance and the output impedance of the equal power divider integrating the band-pass filtering function are the same, and the input impedance and the output impedance of each single-frequency band-pass filtering circuit can be adjusted by changing the coupling strength and the port position between the resonators to realize matching.
In the equal power divider integrating the band-pass filtering function, the isolation element is a resistor, a capacitor or an inductor.
Compared with the prior art, the invention has the following advantages:
(1) the band-pass filtering function is integrated in the traditional power divider, the functions of power division and signal filtering can be realized simultaneously, and compared with a cascaded filtering circuit and a power divider, the size is smaller, so that the integration and miniaturization of a radio frequency front-end system are facilitated.
(2) The equal power divider with the integrated band-pass filtering function has lower insertion loss than a traditional system formed by combining a discrete power divider and a filter.
Drawings
Fig. 1 is a block diagram of an equal power divider integrating a band pass filtering function.
Fig. 2 is a graph of the transmission characteristics of a single frequency bandpass filter circuit.
Fig. 3 is a schematic diagram of a structure of a halving power divider integrating a band pass filtering function.
Fig. 4a is a graph of the transmission characteristics of an equal-division power divider integrating a band-pass filtering function.
Figure 4b is the output return loss and isolation factor of the halved power divider incorporating the band pass filtering function.
Detailed description of the preferred embodiment
The present invention will be described in further detail with reference to the accompanying drawings, but the scope of the invention as claimed is not limited to the scope described in the following examples.
As shown in fig. 1, the equal power divider integrated with the band-pass filtering function includes an upper microstrip structure, an isolation element, a middle dielectric substrate and a lower grounding metal plate, wherein the upper microstrip structure is attached to the upper surface of the middle dielectric plate, and the lower surface of the middle dielectric plate is the grounding metal; the method is characterized in that: the upper-layer microstrip structure comprises two single-frequency band-pass filter circuits which are the same in structure and are arranged in an up-and-down symmetrical structure, the two single-frequency band-pass filter circuits share one input port to serve as the input port I/P of the equal-division power distributor with the integrated band-pass filter function, and the output ports of the two single-frequency band-pass filter circuits serve as the first output port O/P1 and the second output port O/P2 of the equal-division power distributor with the integrated band-pass filter function. The isolation element 18 has one end connected to the open end of the second resonator 2 located above and the other end connected to the open end of the corresponding resonator of the single-frequency band-pass filter circuit located below. The isolation element 18 may be a resistor, a capacitor, or an inductor, among others.
As shown in fig. 1, the single-frequency bandpass filter circuit in the block is formed by coupling three quarter-wavelength resonators, namely a first resonator 1, a second resonator 2 and a third resonator 3; the first resonator 1 is a microstrip line with an open start end and a grounded tail end, and the microstrip line is formed by a first microstrip line 4, a second microstrip line 5, a third microstrip line 6 and a fourth microstrip line 7 which are connected in sequence; the second resonator 2 is a microstrip line with a grounded initial end and an open tail end, and the microstrip line is composed of a fifth microstrip line 8, a sixth microstrip line 9, a seventh microstrip line 10, an eighth microstrip line 11, a ninth microstrip line 12 and a tenth microstrip line 13 which are connected in sequence; the third resonator 3 is a microstrip line with a grounded initial end and an open tail end, and is formed by an eleventh microstrip line 14, a twelfth microstrip line 15, a thirteenth microstrip line 16 and a fourteenth microstrip line 17 which are connected in sequence; the second microstrip line 5 is coupled with the thirteenth microstrip line 16, the third microstrip line 6 is coupled with the twelfth microstrip line 15, the fourth microstrip line 7 is coupled with the fifth microstrip line 8, and one end of the fifth microstrip line 8 is coupled with one end of the eleventh microstrip line 14; the open end of the first resonator 1 is connected with the input port I/P, and the thirteen-microstrip line 16 of the third resonator 3 is connected with the first output port O/P1; length of quarter wave resonatorLIs the resonance frequency of the single-frequency band-pass filter circuitfCorresponding wavelengthλOne fourth of (a); wherein,Lis the actual microstrip line length.
The input and output impedance of each single-frequency band-pass filter circuit can be adjusted by changing the coupling strength between the resonators and the position of the port so as to achieve matching. A single frequency bandpass filter circuit, as shown in the box of fig. 1, has an input impedance of 100 ohms and an output impedance of 50 ohms. Fig. 2 is an amplitude simulation response of this single frequency bandpass filter circuit. The equal power divider integrating the band-pass filtering function consists of two single-frequency band-pass filtering circuits with the same structure, the two single-frequency band-pass filtering circuits are equivalently connected in parallel, and the input impedance of the circuit after the parallel connection is matched with 50 ohms. Just because the input/output impedance of the single-frequency band-pass filter circuit can be adjusted by changing the coupling strength between the resonators and the port position to realize matching, the single-frequency band-pass filter circuit can be used for replacing a quarter-wavelength transmission line used in the traditional power divider to realize the function of impedance transformation, and the matching state can be achieved only by adjusting the input/output impedance. Therefore, when the input impedance and the output impedance of the equal power divider integrating the band-pass filtering function are the same, the input impedance of each single-frequency band-pass filtering circuit is 100 ohms, and the output impedance is 50 ohms, and an isolation resistor is connected in parallel between the two circuits, so that a typical Wilkinson power divider is formed.
Examples
The structure of the equal power divider with the integrated band-pass filtering function is shown in fig. 1, and the relevant dimension specification is shown in fig. 3. The dielectric substrate has a thickness of 0.81mm and a relative dielectric constant of 3.38. The isolation element 18 connected between the single frequency bandpass filter circuits employs a 5.1k ohm resistor to enhance isolation. As shown in FIG. 3, the lengths of the resonators of the single frequency bandpass filter circuitLIs the resonance frequency of the single-frequency band-pass filter circuitfCorresponding wavelengthλL is the sum of L1, L2, L3 and L4. The power splitter is designed according to fig. 3 to obtain the desired input and output impedance characteristics, in-band transmission characteristics and out-of-band attenuation characteristics.
Fig. 4a is a simulation result of the transmission characteristics of an integrated band-pass filter function equal-division power divider designed according to the above parameters; the horizontal axis in the transmission characteristic graph represents frequency and the vertical axis represents transmission characteristic, where S11Equal power divider representing integrated band-pass filtering functionReturn loss of (S)21Representing the insertion loss, S, from the input port I/P to the first output port O/P131Represents the insertion loss from the input port I/P to the second output port O/P2; as can be seen from the simulation results, the actually tested insertion loss curve S21And S31Basically coincide, the center frequency of the passband is 2GHz, and the insertion loss S at the center frequency point21And S31Is-4.0 dB. Due to the fact that the single-frequency band-pass filter circuit is integrated, the insertion loss of the power divider with the integrated band-pass filter function is slightly larger than that of a standard power divider. Return loss S of equal-division power divider integrating band-pass filtering function at central frequency point11Is-31 dB, and two transmission zeros are respectively arranged at two sides of the passband, thereby greatly improving the roll-off characteristic of the filtering function in the power divider. FIG. 4b shows the output return loss S of a power divider with an integrated band-pass filter function designed according to the above parameters22And isolation factor S23 And (4) obtaining a simulation result. Output return loss S at the central frequency point22Is-15 dB, the isolation coefficient S of port 2 and port 323Is-22 dB.
The simulation result of the embodiment shows that the device has two functions, not only can evenly distribute input energy, but also can screen out a required frequency band.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The equal power divider integrating the band-pass filtering function comprises an upper-layer microstrip structure, an isolation element, a middle-layer dielectric substrate and a lower-layer grounding metal plate, wherein the upper-layer microstrip structure is attached to the upper surface of the middle-layer dielectric plate, and the lower surface of the middle-layer dielectric plate is made of grounding metal; the method is characterized in that: the upper-layer microstrip structure comprises two single-frequency band-pass filter circuits, the two single-frequency band-pass filter circuits are identical in structure and are arranged in an up-down symmetrical structure, one input port is shared by the two single-frequency band-pass filter circuits and serves as an input port (I/P) of the equal power distributor with the integrated band-pass filter function, and output ports of the two single-frequency band-pass filter circuits serve as a first output port (O/P1) and a second output port (O/P2) of the equal power distributor with the integrated band-pass filter function; the single-frequency band-pass filter circuit positioned above the single-frequency band-pass filter circuit is formed by coupling three quarter-wavelength resonators, namely a first resonator (1), a second resonator (2) and a third resonator (3); the first resonator (1) is a microstrip line with an open start end and a grounded tail end, and the microstrip line is formed by a first microstrip line (4), a second microstrip line (5), a third microstrip line (6) and a fourth microstrip line (7) which are sequentially connected; the second resonator (2) is a microstrip line which is composed of a fifth microstrip line (8), a sixth microstrip line (9), a seventh microstrip line (10), an eighth microstrip line (11), a ninth microstrip line (12) and a tenth microstrip line (13) which are connected in sequence, the starting end of the microstrip line is grounded, and the tail end of the microstrip line is open; the third resonator (3) is a microstrip line with a grounded initial end and an open-circuit tail end, and the microstrip line consists of an eleventh microstrip line (14), a twelfth microstrip line (15), a thirteenth microstrip line (16) and a fourteenth microstrip line (17) which are connected in sequence; the second microstrip line (5) is coupled with the thirteenth microstrip line (16), the third microstrip line (6) is coupled with the twelfth microstrip line (15), the fourth microstrip line (7) is coupled with the fifth microstrip line (8), and one end of the fifth microstrip line (8) is coupled with one end of the eleventh microstrip line (14); the open end of the first resonator (1) is connected with the input port (I/P), and the thirteen-microstrip line (16) of the third resonator (3) is connected with the first output port (O/P1); one end of the isolation element (18) is connected with the open end of the second resonator (2) positioned above, and the other end is connected with the open end of the corresponding resonator of the single-frequency band-pass filter circuit positioned below.
2. The integrated bandpass filtering equal-fraction power divider as claimed in claim 1, wherein the quarter-wave resonators have lengthsLIs the resonance frequency of the single-frequency band-pass filter circuitfCorresponding wavelengthλOne fourth of (a); wherein,Lis the actual microstrip line length.
3. The equal power divider with integrated band-pass filtering function according to claim 1, wherein the transmission zeros at left and right sides of the passband of the single-frequency band-pass filtering circuit are generated by cross-coupling between the resonators.
4. The integrated band-pass filter function equal-division power divider according to claim 1, wherein the input impedance and the output impedance of the integrated band-pass filter function equal-division power divider are the same, and the input and output impedances of each single-frequency band-pass filter circuit are adjusted by changing the coupling strength between the resonators and the port positions to achieve matching.
5. The integrated band-pass filter function equal power divider according to claim 1, characterized in that the isolation element (18) is a resistor, a capacitor or an inductor.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104953216B (en) * | 2014-03-27 | 2018-04-10 | 南宁富桂精密工业有限公司 | Power processing circuit and multichannel amplifying circuit |
| CN105811063B (en) * | 2014-12-30 | 2019-01-18 | 鸿富锦精密工业（深圳）有限公司 | Power processing circuit, No. two amplifying circuits and multichannel amplifying circuit |
| TWI566462B (en) | 2014-12-30 | 2017-01-11 | 鴻海精密工業股份有限公司 | Power processing circuit, duplex amplified circuit and multiplex amplified circuit |
| CN109066039B (en) * | 2018-06-25 | 2020-09-22 | 南京师范大学 | Novel microstrip power division duplexer |
| TWI730354B (en) * | 2019-07-19 | 2021-06-11 | 國立暨南國際大學 | Power distribution/combination device |
| CN113381142B (en) * | 2021-05-21 | 2022-03-11 | 南京智能高端装备产业研究院有限公司 | Three-passband power division filter with high frequency selectivity |
| CN115473019B (en) * | 2022-08-09 | 2023-09-26 | 华南理工大学 | Filter power divider with reconfigurable arbitrary channel number and radio frequency front end |
| CN115360487B (en) * | 2022-09-05 | 2023-08-11 | 重庆邮电大学 | Plane filtering power divider with broadband external suppression |
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| CN202308258U (en) * | 2011-11-02 | 2012-07-04 | 华南理工大学 | Power divider integrated with single-frequency band-pass filters |
| CN202737076U (en) * | 2012-08-21 | 2013-02-13 | 华南理工大学 | Equal power distributor integrated with band-pass filtering function |
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| US6597258B2 (en) * | 2001-08-30 | 2003-07-22 | Spectrum Astro | High performance diplexer and method |
| CN1747227A (en) * | 2005-08-26 | 2006-03-15 | 中国科学院上海微系统与信息技术研究所 | Little band open loop coupling band-pass filter that offset-type micro-strip resonantor and harmonic wave suppress |
| CN102354787A (en) * | 2011-09-22 | 2012-02-15 | 京信通信系统（中国）有限公司 | Strip line radio-frequency unit and packaging structure thereof |
| CN102403562A (en) * | 2011-11-02 | 2012-04-04 | 华南理工大学 | Powder divider integrating a dual-frequency bandpass filter |
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| CN202308258U (en) * | 2011-11-02 | 2012-07-04 | 华南理工大学 | Power divider integrated with single-frequency band-pass filters |
| CN202737076U (en) * | 2012-08-21 | 2013-02-13 | 华南理工大学 | Equal power distributor integrated with band-pass filtering function |
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Application publication date: 20121219 Assignee: COMBA TELECOM TECHNOLOGY (GUANGZHOU) Ltd. Assignor: South China University of Technology Contract record no.: X2019440000041 Denomination of invention: Equal power splitter integrating band-pass filtering function Granted publication date: 20141008 License type: Exclusive License Record date: 20191202 |
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