CN103943920A - Four-passband duplexer based on branch knot loading stepped impedance resonator - Google Patents
Four-passband duplexer based on branch knot loading stepped impedance resonator Download PDFInfo
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- CN103943920A CN103943920A CN201410181934.XA CN201410181934A CN103943920A CN 103943920 A CN103943920 A CN 103943920A CN 201410181934 A CN201410181934 A CN 201410181934A CN 103943920 A CN103943920 A CN 103943920A
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Abstract
The invention discloses a four-passband duplexer based on a branch knot loading stepped impedance resonator. The four-passband duplexer mainly solves the problem that independent adjustability of passbands in traditional duplexer channels is poor and the passbands are large in sizes and poor in selectivity. The four-passband duplexer comprises a micro-band dielectric substrate (1), a metal earth plate (2), two branch knot loading stepped impedance resonators (3 and 4), a public feeder (5) and two output feeders (6 and 7). Every branch knot loading stepped impedance resonator is composed of two open circuit branch knot loading stepped impedance resonators which are of a pseudo interdigital structure, every open circuit branch knot loading stepped impedance resonator is composed of a stepped impedance resonator and an open circuit branch knot, every stepped impedance resonator is in a U shape, and every open circuit branch knot is located between the stepped impedance resonator to form a pseudo interdigital structure shaped like a double Chinese character shan. Two passbands in independent adjustment in every channel can be achieved, and the four-passband duplexer is compact in structure, small in size and high in passband selectivity and can be used for a multi-passband transceiving communication system.
Description
Technical field
The invention belongs to technical field of electronic devices, particularly micro-band four-way band duplexer, can be used for wireless communication system radio-frequency front-end.
Background technology
Along with the fast development of mobile communication, satellite communication and radar, remote sensing technology, wireless frequency spectrum is day by day crowded, meet the demand of multichannel real time bidirectional communication simultaneously, often need to synthesize and discrete device in the multichannel radio frequency channel of radio-frequency apparatus Front-end Design, therefore the frequency microwave transceiver in communication system proposed to more and more higher requirement.Micro-strip duplexer is as twin-channel frequency-selecting device, can make receive-transmit system share an antenna simultaneously, thereby reduce the complexity of system and crosstalking of receiving and transmitting signal, micro-strip duplexer has advantages of that size is little, lightweight, cost is low, easy processing, is able to extensive use in microwave circuit.
2013, the people such as Hung-Wei Wu are at IEEE Transactions on Microwave and Wireless Components Letters periodical (vol.23, no.5, pp.240-242,2013) on, delivered " Design of New Quad-Channel Diplexer With Compact Circuit Size ", utilize first double-passband filter and duplexer Technology design a kind of four-way band duplexer.This four-way band duplexer is by two pairs of step electric impedance resonators that intercouple and have source and the feeder line of load coupling forms, recently obtain two passband responses by the impedance ratio and the length that regulate step electric impedance resonator, recycling uniform impedance transmission line is made public coupling feed and is realized duplexer design.Although this structure can realize two passbands in each passage, only rely on step electric impedance resonator to be difficult to realize the independent regulation of two passbands, and volume ratio is larger.
Summary of the invention
The object of the invention is the deficiency for above-mentioned prior art, proposes a kind of four-way band duplexer based on minor matters loading stepped-impedance resonator, to realize the independent regulation of two passbands, and reduces volume.
For achieving the above object, the present invention is based on the four-way band duplexer of the loading stepped resonator of minor matters, comprise medium substrate, metal ground plate, two minor matters loading stepped-impedance resonators, common feeder and two output feeders; Common feeder and two output feeders are all placed on micro-top with medium substrate, and each minor matters loading stepped-impedance resonator forms a transmission channel, it is characterized in that:
The first minor matters loading stepped-impedance resonator is made up of the open circuit minor matters loading stepped-impedance resonator of two interdigitated structures of puppet, each open circuit minor matters loading stepped-impedance resonator is made up of the first step electric impedance resonator and the first open circuit minor matters, and the first step electric impedance resonator is " U " shape, the first open circuit minor matters are positioned at the centre of the first step electric impedance resonator, are formed on interdigitated two " mountain " character form structures of puppet of vertical direction;
The second minor matters loading stepped-impedance resonator is made up of the open circuit minor matters loading stepped-impedance resonator of two interdigitated structures of puppet; Each open circuit minor matters loading stepped-impedance resonator is made up of the second step electric impedance resonator and the second open circuit minor matters, and the second step electric impedance resonator is " U " shape, the second open circuit minor matters are positioned at the centre of the second step electric impedance resonator, are formed on interdigitated two " mountain " character form structures of puppet of horizontal direction.
As preferably, the length of the first described step electric impedance resonator meets:
wherein, L
11and L
12the length of two different characteristic transmission lines in the first step electric impedance resonator, λ
g1for the operation wavelength of this resonator works when the resonance frequency, c is the light velocity in vacuum, ε
efor the effective dielectric constant of this resonator, f
10it is the resonance frequency of the first minor matters loading stepped-impedance resonator (3).
As preferably, the length of the second described step electric impedance resonator meets:
wherein, L
21and L
22the length of two different characteristic transmission lines in the second step electric impedance resonator, λ
g2for the operation wavelength of this resonator works when the resonance frequency, c is the light velocity in vacuum, ε
efor the effective dielectric constant of this resonator, f
20it is the resonance frequency of the second minor matters loading stepped-impedance resonator.
As preferably, the length L of described the first open circuit minor matters
13meet: L
13< λ
g1/ 4, λ
g1be the operation wavelength of the first minor matters loading stepped-impedance resonator while being operated in resonance frequency.
As preferably, the length L of described the second open circuit minor matters
23meet: L
23< λ
g2/ 4, λ
g2be the operation wavelength of the second minor matters loading stepped-impedance resonator while being operated in resonance frequency.
As preferably, described common feeder, 50 ohm of connecting lines that it comprises two input main feeders and input main feeder end; This first input main feeder is parallel with the second minor matters loading stepped-impedance resonator both sides in the second minor matters loading stepped-impedance resonator; This second input main feeder is parallel with the first minor matters loading stepped-impedance resonator both sides in the first minor matters loading stepped-impedance resonator.
As preferably, two output feeders, comprise the first output main feeder, the second output main feeder, 50 ohm of connecting lines that are connected with the first output main feeder end, and 50 ohm of connecting lines that are connected with the second output main feeder end; This first output main feeder is parallel with the both sides of the first step electric impedance resonator in the first minor matters loading stepped-impedance resonator; This second output main feeder is parallel with one side of the second step electric impedance resonator in the second minor matters loading stepped-impedance resonator.
The present invention has following technological merit:
1. the present invention is owing to having adopted the interdigitated structure minor matters of the puppet loading stepped-impedance resonator of two cascades, can in a passage, produce the passband of two independent regulation, because the minor matters loading stepped-impedance resonator of each passage adopts two " mountain " character form structures, reduced the overall dimensions of duplexer simultaneously.
2. the present invention, due to the step electric impedance resonator that has adopted minor matters to load, makes to produce a transmission zero between passband, has improved the inhibition degree outside band.
3. the present invention, owing to having adopted stepped impedance transmission line as common feeder, can recently regulate by the Length Ratio of adjusting transmission line and impedance the coupled outside of two passages, has increased the degree of freedom regulating.
4. the present invention, owing to adopting step electric impedance resonator, efficiently solves the problem of fundamental frequency integral multiple spurious response, makes parasitic frequency beyond 3 frequencys multiplication.
Brief description of the drawings
Fig. 1 is tomograph of the present invention;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is the transmission response curve chart of the embodiment of the present invention 1;
Fig. 4 is reflex response and the isolation response curve of the embodiment of the present invention 1;
Fig. 5 is the transmission response curve chart of the embodiment of the present invention 2;
Fig. 6 is reflex response and the isolation response curve of the embodiment of the present invention 2;
Fig. 7 is the transmission response curve chart of the embodiment of the present invention 3;
Fig. 8 is reflex response and the isolation response curve of the embodiment of the present invention 3.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated:
Embodiment 1: the four-way band duplexer that design size is 38.15mm × 33.39mm.
See figures.1.and.2, the present invention is mainly made up of micro-band medium substrate 1, metal ground plate 2, the first minor matters loading stepped-impedance resonator 3, the second minor matters loading stepped-impedance resonator 4, common feeder 5, the first output feeder 6, the second output feeder 7.Common feeder 5, the first output feeder 6 and the second output feeder 7 are all placed on micro-top with medium substrate 1.Wherein:
Described micro-band medium substrate 1, selecting dielectric constant is 2.45, the copper-clad plate that thickness is 1mm, its copper face is as metal ground plate 2;
Described the first minor matters loading stepped-impedance resonator 3, be made up of two the first open circuit minor matters loading stepped-impedance resonators 31 that are cascaded into pseudo-interdigitated structure, each the first open circuit minor matters loading stepped-impedance resonator 31 forms by the first step electric impedance resonator 311 and the first open circuit minor matters 312.Wherein, the width w of the first transmission line of the first step electric impedance resonator 311
11width w with the second transmission line
12meet: w
11=3mm, w
12=1mm, the length L of the first transmission line of this first step electric impedance resonator 311
11length L with the second transmission line
12meet:
and L
11=9.64mm, L
12=8.65mm, in formula, f
10be the resonance frequency of the first minor matters loading stepped-impedance resonator 3, and f
10=3.5GHz, c is the light velocity in vacuum, and c=3 × 10
8m/s, ε
efor the effective dielectric constant of this micro-strip resonantor, and ε
e=2.094.This first step electric impedance resonator 311 is " U " shape shape, and is positioned at micro-upper strata with medium substrate 1; These the first open circuit minor matters 312 are positioned at the centre of this first step electric impedance resonator 311, jointly be formed on interdigitated two " mountain " character form structures of the puppet of vertical direction with the first step electric impedance resonator 311, to be created in the passband of two independent regulation in first passage, and reduce volume.The width w of the first open circuit minor matters 312
13meet: w
13=4mm, its length L
13meet: L
13< λ
g1/ 4=10.4mm, these open circuit minor matters are used for the centre frequency f of first passband that produces the first minor matters loading stepped-impedance resonator 3
11, i.e. f
11=2.4GHz, in formula, λ
g1be the operation wavelength of the first minor matters loading stepped-impedance resonator 3 while being operated in resonance frequency.Two the first parallel g that are spaced apart that open a way between minor matters 312 in this first minor matters loading stepped-impedance resonator 3
13=0.45mm, the first g that is spaced apart opening a way between minor matters 312 and the first step electric impedance resonator 31
14=1.6mm;
Described the second minor matters loading stepped-impedance resonator 4, be made up of two the second open circuit minor matters loading stepped-impedance resonators 41 that are cascaded into pseudo-interdigitated structure, each the second open circuit minor matters loading stepped-impedance resonator 41 forms by the second step electric impedance resonator 411 and the second open circuit minor matters 412.Wherein, the width w of the first transmission line of the second step electric impedance resonator 411
21width w with the second transmission line
22meet: w
21=1.7mm, w
22=1mm, the length L of the first transmission line of this second step electric impedance resonator 411
21length L with the second transmission line
22meeting length meets:
and L
21=5.01mm, L
22=2.86mm, in formula, f
20be the resonance frequency of the second minor matters loading stepped-impedance resonator 4, and f
20=5.8GHz, c is the light velocity in vacuum, and c=3 × 10
8m/s, ε
efor the effective dielectric constant of this micro-strip resonantor, and ε
e=2.120.This second step electric impedance resonator 411 is " U " shape shape, and is positioned at micro-upper strata with medium substrate 1; These the second open circuit minor matters 412 are positioned at the centre of this second step electric impedance resonator 411, jointly be formed on interdigitated two second " mountain " character form structures of the puppet of horizontal direction with the second step electric impedance resonator 411, to be created in the passband of two independent regulation in second passage, and reduce volume.The width w of the second open circuit minor matters 412
23meet: w
23=1.4mm, its length L
23meet:
L
23< λ
g2/ 4=9.85mm, these open circuit minor matters are used for the centre frequency f of first passband that produces the second minor matters loading stepped-impedance resonator 4
21, i.e. f
21=5.2GHz.In formula, λ
g2be the operation wavelength of the second minor matters loading stepped-impedance resonator 4 while being operated in resonance frequency.Two the second parallel g that are spaced apart that open a way between minor matters 412 in this second minor matters loading stepped-impedance resonator 4
23=0.37mm, the second g that is spaced apart opening a way between minor matters 412 and the second step electric impedance resonator 41
24=0.37mm;
Described common feeder 5, it comprises the first input main feeder 51, the second input main feeder 52 and 50 ohm of connecting lines 53 that are connected with the second input main feeder 52 ends; This first input main feeder 51 is parallel with the open circuit of second in the second minor matters loading stepped-impedance resonator 4 minor matters loading stepped-impedance resonator 41 both sides; This second input main feeder 52 is parallel with the open circuit of first in the first minor matters loading stepped-impedance resonator 3 minor matters loading stepped-impedance resonator 31 both sides.The live width of this first main feeder 51 is 0.2mm, and the live width of the second main feeder 52 is 1mm, the interval g between a limit of the first main feeder 51 and the second minor matters loading stepped-impedance resonator 42
20=0.2mm, the interval g between a limit of the second main feeder 52 and the first minor matters loading stepped-impedance resonator 32
10=0.2mm;
Described the first output feeder 6, comprise the first output main feeder 61 and 50 ohm of connecting lines 62 that are connected with the first output main feeder 61 ends, this first output main feeder 61 is parallel with the both sides of the first step electric impedance resonator 311 in the first minor matters loading stepped-impedance resonator 3.Live width of this first output main feeder 61 is 1mm, the interval g between a limit of itself and the first minor matters loading stepped-impedance resonator 31
11=0.2mm;
Described the second output feeder 7, comprise the second output main feeder 71 and 50 ohm of connecting lines 72 that are connected with the second output main feeder 71 ends, this second output main feeder 71 is parallel with one side of the second step electric impedance resonator 411 in the second minor matters loading stepped-impedance resonator 4.Live width of this second output main feeder 71 is 0.5mm, the interval g between a limit of itself and the second minor matters loading stepped-impedance resonator 41
21=0.2mm.
Common feeder 5 connects antenna, make two passages that this four-way band duplexer produces share an antenna, signal is inputted by this antenna, in the time that this four-way band duplexer is operated in first passage, by the first output feeder 6, signal is exported, in the time that this four-way band duplexer is operated in second channel, by the second output feeder 7, signal is exported.
Embodiment 2: the four-way band duplexer that design size is 32.48mm × 32.02mm.
The structure of the present embodiment is identical with embodiment 1, below provides the structural parameters that are different from embodiment 1:
The width w of the first transmission line of described the first step electric impedance resonator 311
11width w with the second transmission line
12meet: w
11=2mm, w
12=1mm, the length L of the first transmission line of this first step electric impedance resonator 311
11length L with the second transmission line
12meet:
and L
11=9.35mm, L
12=5mm, in formula, f
10be the resonance frequency of the first minor matters loading stepped-impedance resonator 3, and f
10=4.1GHz, c is the light velocity in vacuum, and c=3 × 10
8m/s, ε
efor the effective dielectric constant of this micro-strip resonantor, and ε
e=2.10.The width w of the first open circuit minor matters 312
13=2mm, length L
13=11.5mm, first passband that these open circuit minor matters are used for producing the first minor matters loading stepped-impedance resonator 3 is that centre frequency is f
11the passband of=3.2GHz.Two the first parallel g that are spaced apart that open a way between minor matters 312 in this first minor matters loading stepped-impedance resonator 3
13=1.08mm, the first g that is spaced apart opening a way between minor matters 312 and the first step electric impedance resonator 32
14=0.3mm;
The width w of the first transmission line of described the second step electric impedance resonator 411
21width w with the second transmission line
22meet: w
21=1.7mm, w
22=1mm.The length L of the first transmission line of this second step electric impedance resonator 411
21length L with the second transmission line
22meeting length meets: 2 (L
21+ L
22)=17.34mm, and L
21=6.01mm, L
22=2.66mm, in formula, f
20be the resonance frequency of the second minor matters loading stepped-impedance resonator 4, and f
20=6.9GHz, c is the light velocity in vacuum, and c=3 × 10
8m/s, ε
efor the effective dielectric constant of this micro-strip resonantor, and ε
e=2.133.The width w of the second open circuit minor matters 412
23=1.4mm, length L
23=6.65mm, first passband that these open circuit minor matters are used for producing the second minor matters loading stepped-impedance resonator 4 is that centre frequency is f
21the passband of=5.05GHz.Between two parallel open circuit minor matters 412 in this second minor matters loading stepped-impedance resonator 4, be spaced apart g
23=0.4mm, the second g that is spaced apart opening a way between minor matters 412 and the second step electric impedance resonator 42
24=5.15mm;
The live width of described the first main feeder 51 is 0.2mm, and the live width of the second main feeder 52 is 1.1mm, the interval g between a limit of the first main feeder 51 and the second minor matters loading stepped-impedance resonator 42
20=0.2mm, the interval g between a limit of the second main feeder 52 and the first minor matters loading stepped-impedance resonator 32
10=0.2mm;
The live width of described the first output main feeder 61 is 1.2mm, the interval g between a limit of itself and the first minor matters loading stepped-impedance resonator 31
11=0.2mm;
The live width of described the second output main feeder 71 is 0.5mm, the interval g between a limit of itself and the second minor matters loading stepped-impedance resonator 41
21=0.2mm.
Embodiment 3: the four-way band duplexer that design size is 38.15mm × 33.02mm.
The structure of the present embodiment is identical with embodiment 1, below provides the structural parameters that are different from embodiment 1:
The width w of the first transmission line of described the first step electric impedance resonator 311
11width w with the second transmission line
12meet: w
11=3mm, w
12=1mm.The length L of the first transmission line of this first step electric impedance resonator 311
11length L with the second transmission line
12meet:
and L
11=10.64mm, L
12=7.15mm, in formula, f
10be the resonance frequency of the first minor matters loading stepped-impedance resonator 3, and f
10=3.3GHz, c is the light velocity in vacuum, and c=3 × 10
8m/s, ε
efor the effective dielectric constant of this micro-strip resonantor, and ε
e=2.092.The width w of these the first open circuit minor matters 312
13=4mm, length L
13=11.4mm, first passband that these open circuit minor matters are used for producing the first minor matters loading stepped-impedance resonator 3 is that centre frequency is f
11the passband of=2.27GHz.
The width w of the first transmission line of described the second step electric impedance resonator 411
21width w with the second transmission line
22meet: w
21=1.7mm, w
22=1mm.The length L of the first transmission line of this second step electric impedance resonator 411
21length L with the second transmission line
22meeting length meets: 2 (L
21+ L
22)=18.32mm, and L
21=7.01mm, L
22=2.16mm, in formula, f
20be the resonance frequency of the second minor matters loading stepped-impedance resonator 4, and f
20=6.1GHz, c is the light velocity in vacuum, and c=3 × 10
8m/s, ε
efor the effective dielectric constant of this micro-strip resonantor, and ε
e=2.124.
The width w of the second open circuit minor matters 412
23=1.4mm, length L
23=7.65mm, first passband that these open circuit minor matters are used for producing the second minor matters loading stepped-impedance resonator 4 is that centre frequency is f
21the passband of=4.65GHz.
Two the first parallel g that are spaced apart that open a way between minor matters 312 in the first minor matters loading stepped-impedance resonator 3
13=0.45mm, the first g that is spaced apart opening a way between minor matters 312 and the first step electric impedance resonator 32
14=0.6mm.
Two the second parallel g that are spaced apart that open a way between minor matters 412 in the second minor matters loading stepped-impedance resonator 4
23=0.4mm, the second g that is spaced apart opening a way between minor matters 412 and the second step electric impedance resonator 42
24=6.05mm.
The live width of the first main feeder 51 is 0.2mm, and the live width of the second main feeder 52 is 1.1mm, the interval g between a limit of the first main feeder 51 and the second minor matters loading stepped-impedance resonator 42
20=0.2mm, the interval g between a limit of the second main feeder 52 and the first minor matters loading stepped-impedance resonator 32
10=0.2mm.
The live width of the first output main feeder 61 is 0.9mm, the interval g between a limit of itself and the first minor matters loading stepped-impedance resonator 31
11=0.2mm, the live width of the second output main feeder 71 is 0.5mm, the interval g between a limit of itself and the second minor matters loading stepped-impedance resonator 41
21=0.2mm.
Effect of the present invention can further illustrate by following simulation result:
Emulation 1: the transmission characteristic to the four-way band duplexer in embodiment 1 is carried out emulation, and result as shown in Figure 3; Reflection characteristic and isolation characteristic to this four-way band duplexer carry out emulation, and result as shown in Figure 4.S21 in Fig. 3 is the transfer curve of the first minor matters loading stepped-impedance resonator 3 in this four-way band duplexer, and S31 is the transfer curve of the second minor matters loading stepped-impedance resonator 4 in this four-way band duplexer; S11 in Fig. 4 is the coverage diagram of this four-way band duplexer, and S32 is the isolation characteristic curve of the first minor matters loading stepped-impedance resonator 3 and the second minor matters loading stepped-impedance resonator 4 in this four-way band duplexer.
As seen from Figure 3, the centre frequency of the four-way band duplexer in embodiment 1 is respectively 2.4GHz, 3.5GHz, 5.2GHz and 5.8GHz, and relative bandwidth is respectively 2.5%, 1.5%, and 1.5%, 1.8%; Between the high frequency passband of the transfer curve of this four-way band duplexer in each passage and low frequency pass band, have a transmission zero, therefore, this four-way band duplexer has good Out-of-band rejection characteristic;
As seen from Figure 4, the isolation characteristic curve of this four-way band duplexer all-below 30dB, therefore, this four-way band duplexer has good isolation characteristic.
Emulation 2: the transmission characteristic to the four-way band duplexer in embodiment 2 is carried out emulation, and result as shown in Figure 5; Reflection characteristic and isolation characteristic to this four-way band duplexer carry out emulation, and result as shown in Figure 6.S21 in Fig. 5 is the transfer curve of the first minor matters loading stepped-impedance resonator 3 in this four-way band duplexer, and S31 is the transfer curve of the second minor matters loading stepped-impedance resonator 4 in this four-way band duplexer; S11 in Fig. 6 is the coverage diagram of this four-way band duplexer, and S32 is the isolation characteristic curve of the first minor matters loading stepped-impedance resonator 3 and the second minor matters loading stepped-impedance resonator 4 in this four-way band duplexer.
As seen from Figure 5, the centre frequency of the four-way band duplexer in embodiment 2 is respectively 3.2GHz, 4.1GHz, 5.05GHz and 6.9GHz, and relative bandwidth is respectively 4.4%, 2.4%, and 2.3%, 1.9%; Between the high frequency passband of the transfer curve of this four-way band duplexer in each passage and low frequency pass band, have a transmission zero, therefore, this four-way band duplexer has good Out-of-band rejection characteristic;
As seen from Figure 6, the isolation characteristic curve of this four-way band duplexer all-below 30dB, therefore, this four-way band duplexer has good isolation characteristic.
Emulation 3: the transmission characteristic to the four-way band duplexer in embodiment 3 is carried out emulation, and result as shown in Figure 7.Reflection characteristic and isolation characteristic to this four-way band duplexer carry out emulation, and result as shown in Figure 8.S21 in Fig. 7 is the transfer curve of the first minor matters loading stepped-impedance resonator 3 in this four-way band duplexer, and S31 is the transfer curve of the second minor matters loading stepped-impedance resonator 4 in this four-way band duplexer; S11 in Fig. 8 is the coverage diagram of this four-way band duplexer, and S32 is the isolation characteristic curve of the first minor matters loading stepped-impedance resonator 3 and the second minor matters loading stepped-impedance resonator 4 in this four-way band duplexer.
As seen from Figure 7, the centre frequency of the four-way band duplexer in embodiment 3 is respectively 2.27GHz, 3.3GHz, 4.65GHz and 6.1GHz, and relative bandwidth is respectively 3.5%, 1.8%, and 2.6%, 1.8%; Between the high frequency passband of the transfer curve of this four-way band duplexer in each passage and low frequency pass band, have a transmission zero, therefore, this four-way band duplexer has good Out-of-band rejection characteristic;
As seen from Figure 8, the isolation characteristic curve of this four-way band duplexer all-below 30dB, therefore, this four-way band duplexer has good isolation characteristic.
Above-mentioned all embodiment are preferably execution mode of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (7)
1. the four-way band duplexer based on minor matters loading stepped-impedance resonator, comprise medium substrate (1), metal ground plate (2), two minor matters loading stepped-impedance resonators (3,4), common feeder (5) and two output feeders (6,7); This common feeder (5) and two output feeders (6,7) are all placed on the top of micro-band medium substrate (1), and each minor matters loading stepped-impedance resonator forms a transmission channel, it is characterized in that:
The first minor matters loading stepped-impedance resonator (3) is made up of the open circuit minor matters loading stepped-impedance resonator (31) of two interdigitated structures of puppet, each open circuit minor matters loading stepped-impedance resonator (31) is made up of the first step electric impedance resonator (311) and the first open circuit minor matters (312), and the first step electric impedance resonator (311) is " U " shape, the first open circuit minor matters (312) are positioned at the centre of the first step electric impedance resonator (311), are formed on interdigitated two " mountain " character form structures of puppet of vertical direction;
The second minor matters loading stepped-impedance resonator (4) is made up of the open circuit minor matters loading stepped-impedance resonator (41) of two interdigitated structures of puppet; Each open circuit minor matters loading stepped-impedance resonator (41) is made up of the second step electric impedance resonator (411) and the second open circuit minor matters (412), and the second step electric impedance resonator (411) is " U " shape, the second open circuit minor matters (412) are positioned at the centre of the second step electric impedance resonator (411), are formed on interdigitated two " mountain " character form structures of puppet of horizontal direction.
2. four-way band duplexer according to claim 1, is characterized in that, the length of the first step electric impedance resonator (311) meets:
wherein, L
11and L
12the length of two different characteristic transmission lines in the first step electric impedance resonator (311), λ
g1be the operation wavelength of the first minor matters loading stepped-impedance resonator (3) while being operated in resonance frequency, c is the light velocity in vacuum, ε
efor the effective dielectric constant of this resonator, f
10it is the resonance frequency of the first minor matters loading stepped-impedance resonator (3).
3. four-way band duplexer according to claim 1, is characterized in that, the length of the second step electric impedance resonator (411) meets:
wherein, L
21and L
22the length of two different characteristic transmission lines in the second step electric impedance resonator (411), λ
g2be the operation wavelength of the second minor matters loading stepped-impedance resonator (4) resonator works in the time of resonance frequency, c is the light velocity in vacuum, ε
efor the effective dielectric constant of this resonator, f
20it is the resonance frequency of the second minor matters loading stepped-impedance resonator (4).
4. four-way band duplexer according to claim 1, is characterized in that, the length L of the open circuit minor matters of first in the first minor matters loading stepped-impedance resonator (3) (312)
13meet: L
13< λ
g1/ 4, λ
g1be the operation wavelength of the first minor matters loading stepped-impedance resonator (3) while being operated in resonance frequency.
5. four-way band duplexer according to claim 1, is characterized in that, the length L of the open circuit minor matters of second in the second minor matters loading stepped-impedance resonator (4) (412)
23meet: L
23< λ
g2/ 4, λ
g2be the operation wavelength of the second minor matters loading stepped-impedance resonator (4) while being operated in resonance frequency.
6. four-way band duplexer according to claim 1, it is characterized in that, described common feeder (5), it comprises two input main feeders (51,52) and the 50 ohm of connecting lines (53) that are connected with the second input main feeder (52) end;
Described the first input main feeder (51) is parallel with the open circuit of second in the second minor matters loading stepped-impedance resonator (4) minor matters loading stepped-impedance resonators (41) both sides;
Described the second input main feeder (52) is parallel with the open circuit of first in the first minor matters loading stepped-impedance resonator (3) minor matters loading stepped-impedance resonators (31) both sides.
7. four-way band duplexer according to claim 1, it is characterized in that, article two, output feeder (6,7), comprise the first output main feeder (61), second 50 ohm of connecting lines (62) of exporting main feeder (71), being connected with the first output main feeder end, with the 50 ohm of connecting lines (72) that are connected with the second output main feeder end;
Described the first output main feeder (61) is parallel with the both sides of the first step electric impedance resonator (311) in the first minor matters loading stepped-impedance resonator (3);
Described the second output main feeder (71) is parallel with one side of the second step electric impedance resonator (411) in the second minor matters loading stepped-impedance resonator (4).
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| CN111082191B (en) * | 2019-12-25 | 2021-02-02 | 南通大学附属医院 | Duplexer with independently designed channels |
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