CN105048029A - Miniaturized duplexer with wide stop band and high isolation characteristic - Google Patents
Miniaturized duplexer with wide stop band and high isolation characteristic Download PDFInfo
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- CN105048029A CN105048029A CN201510536746.9A CN201510536746A CN105048029A CN 105048029 A CN105048029 A CN 105048029A CN 201510536746 A CN201510536746 A CN 201510536746A CN 105048029 A CN105048029 A CN 105048029A
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Abstract
The invention discloses a miniaturized duplexer with a wide stop band and high isolation characteristic. The miniaturized duplexer comprises an upper micro-strip structure, a middle dielectric substrate and a lower earth metal plate, wherein the upper micro-strip structure comprises an input feeder line part, two filter parts and output feeder line parts; two different signals which are similar in frequency are respectively selected from the signals input from the input feeder line part by the two filters, and are respectively output from respective output feeder line parts; the feeder line parts are selectively coupled to resonators in the filters, so that the wide stop band is realized when the two filters work; and two closely spaced passbands are kept at high isolation characteristic at respective output ends. The miniaturized duplexer has the characteristics of being high in filtering selectivity, very wide in stop band, small in size and easy to realize in a plane.
Description
Technical field
The present invention relates to duplexer is radio system, is specifically related to a kind of miniaturized duplexer with Wide stop bands height isolation characteristic.
Background technology
Duplexer is the basic passive device of one in radio system, is actually the filter that two realize good isolation, realizes the filtering of different frequency.The signal of an input port input is through duplexer, the output signal of two-way different frequency is exported respectively at two output ports, two-way output signal requires the good transmission characteristic keeping filter, the further requirement being different from filter is that the output signal of two-way different frequency will realize good isolation, mutually can not crosstalk.In the radio system of comprehensive double frequency, it is generally employed and whether its performance quality directly affects two paths of signals normally work.
In research in recent years, it is how between the very near filter output mouth of a duplexer two branch road working bands, realize good isolation that Chinese scholars is devoted to one of difficult point overcome.Wherein implementation method is exactly a filtering selectivity for raising two passbands, makes the frequency component not having between two paths of signals to intersect, thus improves the isolation characteristic of two output ports.So in order to improve selectivity, the realization of duplexer generally adopts three-dimensional structure circuit, such as, adopt cavity to design two-way filter, or adopt dielectric resonator to realize.But this considerably increases the cost of manufacture of circuit, be also unfavorable for the integrated of planar circuit, size is also larger.And the filtering characteristic of these circuit does not consider the suppression to harmonic wave, frequency component is impure in very wide frequency ranges.In order to improve above-mentioned shortcoming, ripe and on the PCB manufacturing technology basis of cheapness, the present invention proposes a kind of plane duplexer of high selectivity of Wide stop bands.
Summary of the invention
The object of the invention is to realize low-cost and easy-to on the basis made, propose a kind of miniaturized duplexer of mad stopband height isolation characteristic.In the present invention.Duplexer can realize on planar microstrip, and what effectively utilize between feed line resonator is selectively coupled, realizes Wide stop bands filtering characteristic.Simultaneously because overall microstrip design is compact, the structure proposed feels there is less size, circuit of being more convenient for integrated.
For realizing the object of the invention, the technical solution adopted in the present invention is as follows:
There is the miniaturized duplexer of Wide stop bands height isolation characteristic, comprise upper-layer micro-strip structure, interlayer substrate and lower floor's grounding plate; Two filter section that upper-layer micro-strip structure is arranged by incoming feeder part, output feed line part and left and right are grouped into; Incoming feeder part is coupled to the described filter of two the different operating frequencies in left and right respectively from the signal that input port inputs, is more correspondingly coupled to by the described filter of two different operating frequencies the first output port of exporting feed line part and the second output port exports; In two described filters, the resonator of the high-frequency work frequency filter on the left side is coupled with between feed line part, makes the triple-frequency harmonics of left side high-frequency work frequency filter obtain the degree of depth and suppresses, realize the filtering performance of a Wide stop bands; Resonator and the feed line part of the low frequency operating frequency filter on the right are carried out selectively coupled, are all inhibited, achieve ultra-wide stopband for three times of filter with quintuple harmonics; The passband of two filter close proximity has filtering roll-off characteristic, is isolated between two output ports.
Further, incoming feeder part connects one section of microstrip line by input port and forms, and this section of microstrip line is the microstrip line connected to form by the first microstrip line, the second microstrip line, the 3rd microstrip line, the 4th microstrip line, the 5th microstrip line, the 6th microstrip line, the 7th microstrip line, the 8th microstrip line, the 9th microstrip line, the tenth microstrip line, the 11 microstrip line and the 12 microstrip line, left side high-frequency work frequency filter part is that two high frequency quarter-wave short-circuit resonant devices intercouple formation, one of them resonator is by the 13 microstrip line, 14 microstrip line, 15 microstrip line, 16 microstrip line, 17 microstrip line, the short-circuit micro-band line that 18 microstrip line and the 19 microstrip line connect to form, 19 microstrip line is connected with lower metal plate through interlayer plate by a metallization via hole, another resonator is by the 20 microstrip line, 21 microstrip line, 22 microstrip line, 23 microstrip line, 24 microstrip line, 25 microstrip line, 26 microstrip line, the short-circuit micro-band line that 27 microstrip line and the 28 microstrip line connect to form, 20 microstrip line is connected with lower metal plate through interlayer plate by a metallization via hole, right side low frequency operating frequency filter segment is also that two low frequency quarter-wave short-circuit resonant devices intercouple formation, one of them resonator is by the 29 microstrip line, 30 microstrip line, 31 microstrip line, 32 microstrip line, the short-circuit micro-band line that 33 microstrip line and the 34 microstrip line connect to form, 34 microstrip line is connected with lower metal plate through interlayer plate by a metallization via hole, another resonator is by the 35 microstrip line, 36 microstrip line, 37 microstrip line, 38 microstrip line, the short-circuit micro-band line that 39 microstrip line and the 40 microstrip line connect to form, 35 microstrip line is connected with lower metal plate through interlayer plate by a metallization via hole, left side output feed line part connects one section of microstrip line by the first output port and forms, and this section of microstrip line is the microstrip line connected to form by the 35 microstrip line, the 36 microstrip line and the 37 microstrip line, right side output feed line part connects one section of microstrip line by the second output port and forms, and this section of microstrip line is the microstrip line connected to form by the 41 microstrip line, the 42 microstrip line, the 43 microstrip line and the 44 microstrip line and the 45 microstrip line.
Further, the total length of left side high-frequency work frequency filter two high frequency quarter-wave resonance devices is equivalent to high-frequency work frequency respectively
f h corresponding wavelength
λ h 1/4th; The total length of right side low frequency operating frequency filter two low frequency quarter-wave resonance devices is equivalent to low frequency operating frequency respectively
f l corresponding wavelength
λ l 1/4th.
Further, feed line part and filter coupled time, its stiffness of coupling is equivalent to the integration of product at coupling regime of respective voltage's distribiuting; The stiffness of coupling of the triple-frequency harmonics of the high-frequency work frequency of left side filter is zero, and the transmission of high-frequency work frequency triple-frequency harmonics is inhibited; The stiffness of coupling of the third and fifth harmonic of the low frequency operating frequency of right side filter is zero, and the transmission of low frequency operating frequency third and fifth harmonic is inhibited; Thus realize the broad stop-band of this duplexer.
Further, the 27 microstrip line (44) of left side high-frequency work frequency filter and the 28 microstrip line (45) can realize source load coupling, produce the transmission zero on the right side of high frequency pass band, selectivity is improved further.
Relative to prior art, tool of the present invention has the following advantages and technique effect:
(1) two-way filter circuit surprisingly achieves very wide stop band frequency range at respective passband respectively.
(2) the two-way passband of duplexer has good roll-off characteristic, and make the signal cross-talk of two output ports very little, isolation is higher.
(3) adopt planar microstrip structure, utilize 1/4th wave microstrip lines as resonator, and achieve miniaturized circuit characteristic by flat-folded, be easy to planar circuit integrated.
Accompanying drawing explanation
Fig. 1 is the structure chart of the miniaturized duplexer with Wide stop bands height isolation characteristic;
Fig. 2 is the schematic diagram of the miniaturized duplexer with Wide stop bands height isolation characteristic;
Fig. 3 is the miniaturized duplexer transfer curve figure with Wide stop bands height isolation characteristic;
Fig. 4 is the miniaturized duplexer isolation characteristic curve chart with Wide stop bands height isolation characteristic.
Specific embodiments
Below in conjunction with accompanying drawing, the present invention is further detailed explanation, but the scope of protection of present invention is not limited to the scope of lower example statement.
As shown in Figure 1, the miniaturized duplexer with Wide stop bands height isolation characteristic comprises upper-layer micro-strip structure, interlayer substrate and lower floor's grounding plate.Upper-layer micro-strip structure is made up of incoming feeder part, two filter segments and output feed line part.The signal inputted from incoming feeder part from I/P1 be coupled to respectively left and right two different operating frequencies filter, then be coupled to respectively export feed line exported by O/P2 and O/P3.
As shown in Figure 1, incoming feeder part connects one section of microstrip line by input port I/P1 and forms, and this section of microstrip line is the microstrip line connected to form by the first microstrip line 1, second microstrip line 2, the 3rd microstrip line 27, the 4th microstrip line 28, the 5th microstrip line 29, the 6th microstrip line 3, the 7th microstrip line 4, the 8th microstrip line 5, the 9th microstrip line 6, the tenth microstrip line the 7, the 11 microstrip line the 8 and the 12 microstrip line 9, left side high-frequency work frequency filter part is that two high frequency quarter-wave short-circuit resonant devices intercouple formation, one of them resonator is by the 13 microstrip line 30, 14 microstrip line 31, 15 microstrip line 32, 16 microstrip line 33, 17 microstrip line 34, the short-circuit micro-band line that 18 microstrip line the 35 and the 19 microstrip line 36 connects to form, 19 microstrip line 36 is connected with lower metal plate through interlayer plate by a metallization via hole 51, another resonator is by the 20 microstrip line 37, 21 microstrip line 38, 22 microstrip line 39, 23 microstrip line 40, 24 microstrip line 41, 25 microstrip line 42, 26 microstrip line 43, the short-circuit micro-band line that 27 microstrip line the 44 and the 28 microstrip line 45 connects to form, 20 microstrip line 37 is connected with lower metal plate through interlayer plate by a metallization via hole 52, right side low frequency operating frequency filter segment is also that two low frequency quarter-wave short-circuit resonant devices intercouple formation, one of them resonator is by the 29 microstrip line 10, 30 microstrip line 11, 31 microstrip line 12, 32 microstrip line 13, the short-circuit micro-band line that 33 microstrip line the 14 and the 34 microstrip line 15 connects to form, 34 microstrip line 15 is connected with lower metal plate through interlayer plate by a metallization via hole 50, another resonator is by the 35 microstrip line 16, 36 microstrip line 17, 37 microstrip line 18, 38 microstrip line 19, the short-circuit micro-band line that 39 microstrip line the 20 and the 40 microstrip line 21 connects to form, 35 microstrip line 16 is connected with lower metal plate through interlayer plate by a metallization via hole 49, left side output feed line part connects one section of microstrip line by the first output port O/P2 and forms, and this section of microstrip line is the microstrip line connected to form by the 35 microstrip line the 45, the 36 microstrip line the 46 and the 37 microstrip line 47, right side output feed line part connects one section of microstrip line by the second output port O/P3 and forms, and this section of microstrip line is the microstrip line connected to form by the 41 microstrip line the 22, the 42 microstrip line the 23, the 43 microstrip line the 24 and the 44 microstrip line the 25 and the 45 microstrip line 26, the total length of left side high-frequency work frequency filter two high frequency quarter-wave resonance devices is equivalent to high-frequency work frequency respectively
f h corresponding wavelength
λ h 1/4th, the total length of right side low frequency operating frequency filter two low frequency quarter-wave resonance devices is equivalent to low frequency operating frequency respectively
f l corresponding wavelength
λ l 1/4th,
As Fig. 2 has shown in the miniaturized duplexer schematic diagram of Wide stop bands height isolation characteristic, each dimension of microstrip line parameter is as follows:
l 1 =7.4 ± 0.05mm,
l 2 =2.3 ± 0.05mm,
l 3 =3.0 ± 0.05mm,
l 4 =2.0 ± 0.05mm,
l 5 =0.5 ± 0.05mm,
l 6 =7.5 ± 0.05mm,
l 7 =8.0 ± 0.05mm,
l 8 =6.0 ± 0.05mm,
l 9 =1.7 ± 0.05mm,
l 10 =4.2 ± 0.05mm,
l 11 =4.8 ± 0.05mm,
l 12 =6.3 ± 0.05mm,
l 13 =1.8 ± 0.05mm,
l 14 =13.8 ± 0.05mm,
l 15 =11.0 ± 0.05mm,
l 16 =3.2 ± 0.05mm,
w 1 =0.5 ± 0.02mm,
w 2 =0.5 ± 0.02mm,
w 3 =0.3 ± 0.02mm,
w 4 =0.5 ± 0.02mm,
w 5 =0.7 ± 0.02mm,
g 1 =0.1 ± 0.01mm,
g 2 =0.1 ± 0.01mm,
g 3 =0.4 ± 0.01mm,
g 4 =0.4 ± 0.01mm.
The impedance of each input/output port can be undertaken regulating to reach coupling by the stiffness of coupling between change resonator and port position.As an input port I/P1 of Fig. 1 and the input impedance of two output port O/P2 and O/P3 are 50 ohm, Fig. 3 and Fig. 4 comprises self and mutual amplitude simulated response of each input/output port of this duplexer respectively.
Embodiment
Have the structure chart of the miniaturized duplexer of Wide stop bands height isolation characteristic as shown in Figure 1, regarding sizes specification as shown in Figure 2.The thickness of medium substrate is 0.81mm, and relative dielectric constant is 3.38.
Fig. 3 is the artificial transmission performance diagram that of designing according to above-mentioned parameter has the low frequency pass band of the miniaturized duplexer of Wide stop bands height isolation characteristic; Transverse axis in transfer curve way represents frequency, and the longitudinal axis represents transmission characteristic, wherein S
11represent the return loss of first input end mouth I/P1, S
21represent the insertion loss of port I/P1 to port O/P2, S
31represent the insertion loss of port I/P1 to port O/P3; From simulation result, low frequency pass band centre frequency, at 1.8GHz, is-0.84dB at the insertion loss of center frequency point, and minimum return loss is-27dB, and respectively there is a transmission zero on passband both sides, effectively improve the roll-off characteristic of filter function.High frequency pass band centre frequency, at 2.45GHz, is-1.08dB at the insertion loss of center frequency point, and minimum return loss is-25dB, and respectively there is a transmission zero on passband both sides.Fig. 4 is the isolation characteristic curve chart between two output ports of the miniaturized duplexer with Wide stop bands of designing according to above-mentioned parameter, S
32represent the isolating coefficient of the first output port O/P2 and the second output port O/P3, visible not only two working bands and between frequency band, and the isolating coefficient of the frequency band of low frequency operating frequency quintuple harmonics is all below-30dB, embody the Wide stop bands performance far exceeding working band.
The simulation result of embodiment shows device of the present invention, not only can realize the function of duplex respectively transmitting two paths frequency signal, and isolation performance between two output ports is good and have the broad stop-band far exceeding working band.
The foregoing is only preferred embodiments of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. there is the miniaturized duplexer of Wide stop bands height isolation characteristic, it is characterized in that: comprise upper-layer micro-strip structure, interlayer substrate and lower floor's grounding plate; Two filter section that upper-layer micro-strip structure is arranged by incoming feeder part, output feed line part and left and right are grouped into; Incoming feeder part is coupled to the described filter of two the different operating frequencies in left and right respectively from the signal that input port (I/P1) inputs, is more correspondingly coupled to by the described filter of two different operating frequencies the first output port (O/P2) of exporting feed line part and the second output port (O/P3) exports; In two described filters, the resonator of the high-frequency work frequency filter on the left side is coupled with between feed line part, makes the triple-frequency harmonics of left side high-frequency work frequency filter obtain the degree of depth and suppresses, realize the filtering performance of a Wide stop bands; Resonator and the feed line part of the low frequency operating frequency filter on the right are carried out selectively coupled, are all inhibited, achieve ultra-wide stopband for three times of filter with quintuple harmonics; The passband of two filter close proximity has filtering roll-off characteristic, is isolated between two output ports.
2. there is the miniaturized duplexer of Wide stop bands height isolation characteristic according to claim 1, it is characterized in that incoming feeder part connects one section of microstrip line by input port (I/P1) and forms, this section of microstrip line is by the first microstrip line (1), second microstrip line (2), 3rd microstrip line (27), 4th microstrip line (28), 5th microstrip line (29), 6th microstrip line (3), 7th microstrip line (4), 8th microstrip line (5), 9th microstrip line (6), tenth microstrip line (7), the microstrip line that 11 microstrip line (8) and the 12 microstrip line (9) connect to form, left side high-frequency work frequency filter part is that two high frequency quarter-wave short-circuit resonant devices intercouple formation, and one of them resonator is by the 13 microstrip line (30), 14 microstrip line (31), 15 microstrip line (32), 16 microstrip line (33), 17 microstrip line (34), the short-circuit micro-band line that 18 microstrip line (35) and the 19 microstrip line (36) connect to form, 19 microstrip line (36) is connected with lower metal plate through interlayer plate by metallization via hole (51), and another resonator is by the 20 microstrip line (37), 21 microstrip line (38), 22 microstrip line (39), 23 microstrip line (40), 24 microstrip line (41), 25 microstrip line (42), 26 microstrip line (43), the short-circuit micro-band line that 27 microstrip line (44) and the 28 microstrip line (45) connect to form, the 20 microstrip line (37) is connected with lower metal plate through interlayer plate by metallization via hole (52), right side low frequency operating frequency filter segment is also that two low frequency quarter-wave short-circuit resonant devices intercouple formation, one of them resonator is by the 29 microstrip line (10), 30 microstrip line (11), 31 microstrip line (12), 32 microstrip line (13), the short-circuit micro-band line that 33 microstrip line (14) and the 34 microstrip line (15) connect to form, 34 microstrip line (15) is connected with lower metal plate through interlayer plate by metallization via hole (50), another resonator is by the 35 microstrip line (16), 36 microstrip line (17), 37 microstrip line (18), 38 microstrip line (19), the short-circuit micro-band line that 39 microstrip line (20) and the 40 microstrip line (21) connect to form, 35 microstrip line (16) is connected with lower metal plate through interlayer plate by metallization via hole (49), left side output feed line part connects one section of microstrip line by the first output port (O/P2) and forms, and this section of microstrip line is the microstrip line connected to form by the 35 microstrip line (45), the 36 microstrip line (46) and the 37 microstrip line (47), right side output feed line part connects one section of microstrip line by the second output port (O/P3) and forms, and this section of microstrip line is the microstrip line connected to form by the 41 microstrip line (22), the 42 microstrip line (23), the 43 microstrip line (24) and the 44 microstrip line (25) and the 45 microstrip line (26).
3. there is the miniaturized duplexer of Wide stop bands height isolation characteristic according to claim 1, it is characterized in that the total length of left side high-frequency work frequency filter two high frequency quarter-wave resonance devices is equivalent to high-frequency work frequency respectively
f h corresponding wavelength
λ h 1/4th; The total length of right side low frequency operating frequency filter two low frequency quarter-wave resonance devices is equivalent to low frequency operating frequency respectively
f l corresponding wavelength
λ l 1/4th.
4. there is the miniaturized duplexer of Wide stop bands height isolation characteristic according to claim 1, it is characterized in that feed line part and filter coupled time, its stiffness of coupling is equivalent to the integration of product at coupling regime of respective voltage's distribiuting; The stiffness of coupling of the triple-frequency harmonics of the high-frequency work frequency of left side filter is zero, and the transmission of high-frequency work frequency triple-frequency harmonics is inhibited; The stiffness of coupling of the third and fifth harmonic of the low frequency operating frequency of right side filter is zero, and the transmission of low frequency operating frequency third and fifth harmonic is inhibited; Thus realize the broad stop-band of this duplexer.
5. there is the miniaturized duplexer of Wide stop bands height isolation characteristic according to claim 2, it is characterized in that the 27 microstrip line (44) and the 28 microstrip line (45) of left side high-frequency work frequency filter can realize source load coupling, produce the transmission zero on the right side of high frequency pass band.
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| CN106936417A (en) * | 2017-04-24 | 2017-07-07 | 华南理工大学 | A kind of miniaturization filtered switch based on quasi- lumped parameter |
| CN114447546A (en) * | 2022-01-22 | 2022-05-06 | 北京邮电大学 | High-isolation subminiature planar duplexer for communication |
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