CN106450605B - Duplexer based on short-circuit branch loading type composite left-right-hand resonator - Google Patents
Duplexer based on short-circuit branch loading type composite left-right-hand resonator Download PDFInfo
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Abstract
A duplexer based on a short-circuit branch loading type composite left-right hand resonator relates to a transmitting-receiving duplexer. The micro-strip structure comprises an upper micro-strip structure, a middle dielectric substrate and a bottom grounding plate; the upper-layer microstrip structure comprises three input and output feeder lines, a first channel short-circuit branch loading type composite left-right-hand resonator and a first channel short-circuit branch loading type composite right-hand resonator, a second channel short-circuit branch loading type composite right-hand resonator, a coupling line and a square grounding patch, wherein the coupling line and the square grounding patch are distributed near the upper half circumference of the first channel short-circuit branch loading type composite right-hand resonator and the upper half circumference of the coupling line; one end of the feeder line is connected with the coupling line and is in a right-angle structure, and the other end of the feeder line is connected with the inner conductor of the coaxial cable; the upper surface and the lower surface of the middle-layer dielectric substrate are respectively tightly attached to the upper-layer microstrip structure and the bottom-layer grounding plate, the bottom-layer grounding plate covers the lower surface of the middle-layer dielectric substrate, and the bottom-layer grounding plate is connected with the outer conductor of the coaxial cable.
Description
Technical Field
The invention relates to a transmitting and receiving duplexer for communication, in particular to a duplexer based on a short-circuit branch loading type composite left-right-hand resonator.
Background
Since 2000, David Smith manufactured the first left-handed material by using metal wires and split-ring resonators arranged in a space cycle, the left-handed material which only exists in theoretical analysis in the past entered the public field of vision and received unprecedented attention in the fields of science and technology and engineering, however, the application of the left-handed material in microwave engineering is limited by the defects of large volume, narrow bandwidth, large loss and the like. However, the enthusiasm of people for left-handed materials is not reduced, and research groups led by eleftriades and research groups led by t.itoh and c.caloz have proposed a plane non-resonant composite left-handed and right-handed transmission line structure with a periodically loaded set of a total distributed parallel inductor and a series capacitor in 2002, in particular to a plane non-resonant composite left-handed and right-handed transmission line structure with a distributed parallel inductor and a series capacitor therein, wherein the structure realizes the series capacitor by opening a metal strip of a microstrip line, and realizes the parallel inductor by loading a parallel branch node with a short-circuited terminal on the metal strip of the microstrip line.
In 2006, C.Caloz and T.Itoh have written a book of "Electromagnetic metals: Transmission Line Theory and Microwave Applications", which records many characteristics of left-handed materials and their application in the Microwave field, and also provides the condition that the composite left-handed and right-handed Transmission Line unit is equivalent to a uniform Transmission Line. Compared with a pure left-handed material, the structure not only has great improvement on performance, but also ensures the compactness of the structure, and provides new possibility for the miniaturization of microwave passive devices.
At present, most wireless communication systems simultaneously work on a plurality of frequency bands, and duplexers are regarded as important devices in the field of microwave communication, and are focused by extensive researchers. The duplexer is a microwave device designed to solve the problem that a pair of antennas is shared during transmitting and receiving, but the antennas are not affected mutually, and is equivalent to the function of a switch. When the transmitter works, the duplexer switches on the antenna and the transmitter, and the receiver is switched off; on the contrary, the duplexer turns on the receiver and turns off the transmitter when the receiver operates, which makes the duplexer applicable to various microwave communication devices requiring transmission and reception of information in a specific frequency band.
In recent years, demands for miniaturization and portability of radio equipment have been increasing, and there are increasing demands for miniaturization, low cost, and the like of radio frequency microwave devices. In order to comply with the development trend, researchers in the microwave field have proposed various duplexers with compact structures, such as: even though some new manufacturing processes such as a spiral structure and a folded structure are proposed, miniaturization is desired to be achieved to the maximum extent, but the application of these duplexers is still limited due to the limitations of the manufacturing processes and the structures themselves. Industrial application needs a duplexer with good performance, simple manufacturing process, flexible design, compact structure, small volume and low cost, and the application of the composite right-hand and left-hand transmission line unit in the construction of the duplexer is a feasible method for reducing the volume of the duplexer, and has very wide application prospects in the field of microwave application.
Disclosure of Invention
The invention aims to provide a duplexer based on a short-circuit branch loading type composite left-right-hand resonator, which can realize the performances of miniaturization, controllable bandwidth, adjustable frequency and the like, has simple manufacturing process, flexible design, compact structure, small volume and low construction cost, and overcomes the defects in the prior art.
The invention is provided with an upper layer microstrip structure, a middle layer dielectric substrate and a bottom layer grounding plate;
the upper-layer microstrip structure comprises three input and output feeder lines, a short-circuit branch loading type composite left-right-hand resonator of a first channel, a short-circuit branch loading type composite left-right-hand resonator of a second channel, and square grounding patches which are distributed near the upper half circumference of the first and second channel short-circuit branch loading type composite left-right-hand resonators and the terminals of coupling lines, wherein a gap exists between the coupling lines and the short-circuit branch loading type composite left-right-hand resonators, and the centers above the short-circuit branch loading type composite left-right-hand resonators are connected with a bottom-layer grounding plate through the square grounding patches; one end of the feeder line is connected with the coupling line and is in a right-angle structure, and the other end of the feeder line is connected with the inner conductor of the coaxial cable;
the upper surface and the lower surface of the middle-layer dielectric substrate are respectively tightly attached to the upper-layer microstrip structure and the bottom-layer grounding plate, the bottom-layer grounding plate completely covers the lower surface of the middle-layer dielectric substrate, and the bottom-layer grounding plate is connected with the outer conductor of the coaxial cable.
The short-circuit stub loaded composite left-right-hand resonator can be composed of two composite left-right-hand transmission line units and a short-circuit loading stub.
The composite left-right hand transmission line unit can be composed of a capacitive interdigital structure and inductive zigzag short-circuit branches, the number of the capacitive interdigital structure branches is 5, the length of the interdigital branches is 2.5-3.0 mm, and the width of the interdigital branches is 0.12-0.18 mm; the terminal of the inductive zigzag short circuit branch is connected with the bottom layer grounding plate through a circular grounding patch, the radius of a central through hole of the circular grounding patch is 0.25-0.35 mm, the radius of the circular grounding patch is 0.35-0.45 mm, and the total length of the inductive zigzag short circuit branch is 6.5-10 mm.
The short circuit loading branch is 0.7-0.9 mm in width and 3.5-4.5 mm in length. The center of the tail end of the short circuit loading branch is connected with the bottom ground plate through a circular metal through hole, the distance between the circle center of the circular metal through hole and the tail end of the short circuit loading branch is 0.4-0.5 mm, and the radius of the circular metal through hole is 0.25-0.35 mm.
The width of the coupling line is 0.2-0.3 mm, and the distance between the coupling line and the short circuit branch loading type composite left-right hand resonator is 0.1-0.2 mm; the coupling lines extend along the outline of the short-circuit branch loading type composite left-right-hand resonator, and the total length of each coupling line is 6-10 mm; the terminal of two coupling lines respectively connected with the feeder lines of the first port and the second port is connected with the bottom ground plate through a square ground patch, the radius of a central through hole of the square ground patch is 0.25-0.35 mm, and the side length of the square metal patch is 0.8-1.0 mm.
The three input and output feeder lines are respectively connected with a first port (P1), a second port (P2) and a third port (P3) of the duplexer based on the short-circuit branch loading type composite left-right-hand resonator. The first port (P1) to the second port (P2) form a first channel transmission path, and the first port (P1) to the third port (P3) form a second channel transmission path.
The feeder line connected with the first port (P1) is split into two feeder lines with the same width as the original feeder line at a position short of the port, and the two feeder lines are respectively connected with the input ports of the first channel and the second channel.
The feeder line is a 50-ohm microstrip feeder line, the width of the feeder line is determined and calculated by the channel center frequency, the substrate parameters, the thickness of the microstrip line and the like, and the length of the feeder line is 4-8 mm; the characteristic impedance of the coaxial cable is 50 Ω.
The middle layer dielectric substrate is a cuboid, the long edge of the cuboid is 14-17 mm, the wide edge of the cuboid is 13-16 mm, the height of the middle layer dielectric substrate is 0.508mm, the material is Rogers R04350B, the relative dielectric constant of the middle layer dielectric substrate is 3.48, the relative magnetic permeability of the middle layer dielectric substrate is 1, and the loss tangent angle of the middle layer dielectric substrate is 0.004.
The invention has the beneficial effects that:
the invention provides a duplexer based on a short-circuit branch loading type composite left-right hand resonator, wherein a first channel and a second channel are respectively generated by two short-circuit branch loading type composite left-right hand resonators with different sizes, the working frequencies are respectively 2.6GHz and 2.9GHz, and the central frequencies and bandwidths of the first channel and the second channel can be independently adjusted by changing and controlling the parameters of the short-circuit branch loading type composite left-right hand resonator of the first channel and the second channel. By applying the capacitive interdigital structure and the inductive zigzag short-circuit branch knot, the volume of the duplexer is effectively reduced, the structure is more compact, and the miniaturization of equipment is realized. The magnetic source load coupling structure improves the frequency selectivity of the duplexer. The bottom grounding plate is a complete ground, which is beneficial to maintaining the integrity of signals, effectively prevents the signals from leaking and is easy to integrate with other microstrip circuits.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a top view of a short-circuit branch loading-based composite left-right-hand resonator according to the present invention;
FIG. 3 is a top view of the present invention;
FIG. 4 shows an embodiment of S21And S31Parameter with d3A varying frequency response profile;
FIG. 5 shows an embodiment of S21And S31Parameter with d4Varying frequency responseA graph;
FIG. 6 shows an embodiment of S21、S31、S22And S33A parametric frequency response plot;
FIG. 7 is a graph of the frequency response of the S11 and S32 parameters of an embodiment of the present invention.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 and 2, the embodiment of the present invention is provided with an upper microstrip structure, a middle dielectric substrate and a bottom ground plate.
Wherein, the upper layer microstrip structure comprises an input/output port, a feeder line, a coupling line and two short circuit branch loaded composite left-hand and right-hand resonators 6 and 7 with different sizes and the same structure; the characteristic impedances of the input port P1 and the output ports P2 and P3 are both 50 omega and are respectively connected with 50 omega feeder lines 1,2 and 3, the width of the 50 omega feeder line is determined and calculated by the channel center frequency, substrate parameters, microstrip line thickness and the like, and the length of the feeder line is 4-8 mm, wherein the first feeder line 1 is further divided into a two-component inverted Z-shaped feeder line 4 and an L-shaped feeder line 5 which are respectively used as input feeder lines of a first channel and a second channel, and the second feeder line 2 and the third feeder line 3 are respectively used as output feeder lines of the first channel and the second channel. The thickness of the upper layer microstrip structure is 0.018 mm.
The short-circuit branch loading type composite left-hand and right-hand resonators 6 and 7 are used for generating a first filter channel and a second filter channel respectively, the resonator 6 is composed of two composite left-hand and right-hand transmission line units 8 and 9 and a short-circuit loading branch 10, the width of the short-circuit loading branch 10 is 0.7-0.9 mm, and the length of the short-circuit loading branch is 3.5-4.5 mm. The center of the tail end of the branch is connected with the bottom-layer grounding plate through a circular metal through hole, the distance between the circle center of the circular metal through hole and the tail end of the short-circuit loading branch is 0.4-0.5 mm, and the radius of the circular metal through hole is 0.25-0.35 mm. The composite left-right hand transmission line unit 8 comprises a capacitive interdigital structure and inductive zigzag short-circuit branches, wherein the interdigital structure consists of 5 interdigital branches, and comprises two microstrip lines 11 connected with the inductive zigzag short-circuit branches and three microstrip lines 12 connected with the short-circuit loading branches 10, the length of the interdigital branches is 2.5-3.0 mm, and the width of the interdigital branches is 0.12-0.18 mm; the inductive zigzag short-circuit branch is formed by connecting a microstrip line 13, a microstrip line 14, a microstrip line 15 and a circular grounding patch 16, wherein the total length of the microstrip line 13 and the microstrip line 14 is 6.0-10.0 mm, the width of the microstrip line 15 is 0.12-0.18 mm, the radius of a central through hole of the circular grounding patch 16 is 0.25-0.35 mm, and the radius of the circular grounding patch 16 is 0.35-0.45 mm. The composite right-left hand transmission line unit 9 and the composite right-left hand transmission line unit 8 have the same structure and are symmetrically distributed.
According to the analysis of the references "C.Caloz and T.Itoh, Electromagnetic metals: Transmission Line Theory and Microwave applications. Hoboken, NJ: Wiley-IEEEPress, 2006", when the electrical length of the composite left and right hand Transmission Line unit is less than
Then, we can make the composite right-left hand transmission line unit equivalent to a uniform transmission line, as shown in fig. 2, taking the first channel as an example, the electrical length and impedance of the equivalent uniform transmission line of the composite right-left hand transmission line unit are θ1And Z1Wherein theta1When odd-mode excitation is loaded at two ends of the resonator, the voltage at the central position is zero, so that the loaded short-circuit branch does not influence the odd-mode resonant frequency, the odd-mode resonant frequency is as follows:
wherein, to satisfy
n is 1; c is the speed of light in vacuum; epsiloneffIs the effective dielectric constant. Due to the physical length L of the composite right-left hand transmission line unit1The physical length of the uniform transmission line has positive correlation with the equivalent, so that the odd-mode resonant frequency of the first channel can be changed by changing L1Is controlled by the length of the strain.
When the two ends of the resonator are loaded with the excitation of the even mode, the current at the central position is zero, and the resonant frequency is determined by the loaded short-circuit branch and the equivalent length of the composite left-right hand transmission line unit. The even mode resonant frequency is:
wherein n is 1,2,3, …; c is the speed of light in vacuum; epsiloneffIs the effective dielectric constant. It can be seen that the length d of the short-circuit loading branch only affects the resonance frequency of the even mode, does not affect the resonance frequency of the odd mode, and is compounded with the physical length L of the left-hand and right-hand transmission line units1Not only can the odd mode resonance frequency be influenced, but also the even mode resonance frequency can be influenced. So I can change L1And d to regulate the center frequency and bandwidth of the first channel. The resonator structure of the second channel is identical to that of the first channel, and its control principle is also identical to that of the first channel.
The coupling lines are positioned at two sides of the short-circuit branch loading type composite left-hand and right-hand resonators 6 and 7 and are formed by connecting a microstrip line 17, a microstrip line 18, a microstrip line 19, a microstrip line 20 and a square grounding patch 21, the microstrip line 17 and the microstrip line 18 extend along a right-angle vertex of the resonator 6 to form a reversed L-shaped microstrip line, the width of the reversed L-shaped microstrip line is 0.2-0.3 mm, and the distance between the reversed L-shaped microstrip line and the short-circuit branch loading type composite left-hand and right-hand resonators is 0.1-; the total length of the microstrip line 17 and the microstrip line 18 is 6-10 mm; the microstrip line 19 and the microstrip line 20 extend along the other right-angle vertex of the resonator 6 to form an inverted-L-shaped microstrip line, and are symmetrically distributed with the microstrip line 17 and the microstrip line 18. The microstrip line 18, the microstrip line 19 and the square grounding patch 21 realize source load cross coupling, the out-of-band characteristic of a first channel is improved, the selectivity of the duplexer is improved, the radius of a central through hole of the square grounding patch is 0.25-0.35 mm, the side length of the square metal patch is 0.8-1.0 mm, and the microstrip line 17 and the microstrip line 20 are respectively connected with the feeder line 2 and the feeder line 4. The distribution of the coupling lines around the short-circuit stub loaded type composite left-right hand resonator 7 is the same as that around the short-circuit stub loaded type composite left-right hand resonator 6, and the widths of the coupling lines are the same.
The middle layer dielectric substrate 22 is a cuboid, the long edge of the cuboid is 14-17 mm, the wide edge of the cuboid is 13-16 mm, the height of the cuboid is 0.508mm, the material is Rogers R04350B, the relative dielectric constant of the middle layer dielectric substrate is 3.48, the relative magnetic permeability of the middle layer dielectric substrate is 1, and the loss tangent of the middle layer dielectric substrate is 0.004. The upper surface of the middle layer medium substrate is tightly attached to the upper layer microstrip structure, the lower surface of the middle layer medium substrate is tightly attached to the bottom layer grounding plate with the surface area equal to that of the middle layer medium substrate, the bottom layer grounding plate completely covers the middle layer medium substrate, the bottom layer grounding plate is connected with a 50 omega coaxial cable outer conductor, and the thickness of the bottom layer grounding plate is 0.018 mm.
FIG. 3 is a top view of an embodiment of the present invention and the parameters indicated therein. Table 1 shows the optimum dimensions for the parameters of the present invention.
TABLE 1
| Parameter(s) | Size (mm) | Parameter(s) | Size (mm) |
| L | 5 | L1 | 2.65 |
| L2 | 3.95 | L3 | 2.05 |
| L4 | 3.25 | L5 | 3.4 |
| L6 | 4.3 | L7 | 2.2 |
| L8 | 7.6 | L9 | 2.55 |
| L10 | 2.35 | L11 | 1.95 |
| L12 | 3.7 | L13 | 2.95 |
| W | 1.1 | W1 | 0.15 |
| W2 | 0.3 | W3 | 1.1 |
| W4 | 1.4 | W5 | 0.8 |
| W6 | 0.15 | r0 | 0.25 |
| r1 | 0.4 | S1 | 0.1 |
| S2 | 0.1 | S3 | 0.1 |
| d1 | 0.8 | d2 | 0.1 |
| d3 | 4 | d4 | 3.4 |
According to the parameters, the characteristic parameters of the embodiment of the invention are subjected to S-parameter simulation analysis by using HFSS.
Fig. 4 and 5 show simulation results of an embodiment designed using the parameters, where as shown in fig. 4, when other parameters are unchanged and only the length d3 of the short-circuited stub loaded type composite left-right hand resonator generating the first channel is changed, the center frequency and bandwidth of the first channel of the embodiment are changed, but the center frequency and bandwidth of the second channel of the embodiment are unchanged, as shown in fig. 5, and when other parameters are unchanged and only the length d4 of the short-circuited stub loaded type composite left-right hand resonator generating the second channel is changed, the center frequency and bandwidth of the second channel of the embodiment are changed, and the center frequency and bandwidth of the first channel of the embodiment are unchanged.
FIG. 6 shows S according to an embodiment of the present invention21、S31、S22And S33Parametric frequency response plots. As shown, for the first channel, at S21>Under the condition of-3 dB, the coverage range of a pass band is 2.50-2.66 GHz, the central frequency is 2.58GHz, and the band is S22<14.7dB, the relative bandwidth of the passband being 6.3%; for the second channel, at S31>Under the condition of-3 dB, the coverage range of a pass band is 2.87-3.06 GHz, the central frequency is 2.96GHz, and the band is S22<12.6dB, the relative bandwidth of the passband is 6.3%. FIG. 7 is a graph of the frequency response of the S11 and S32 parameters of an embodiment of the present invention. Within the range of 1 to 5.5GHz, S32<23dB, i.e. the isolation is greater than 23 dB.
On the basis of the short-circuit branch loading type composite left-right hand resonator, the two short-circuit branch loading type composite left-right hand resonators with the same structure and different sizes are respectively used for constructing a first channel transmission path and a second channel transmission path of a duplexer based on the short-circuit branch loading type composite left-right hand resonator. The short-circuit branch loaded type composite left-right hand resonator is composed of two composite left-right hand transmission line units and a short-circuit loading branch. The short circuit loading branch has the effect that the short circuit branch loading type composite left-right hand resonator has two resonance modes of an odd mode and an even mode, wherein only the odd mode resonance frequency is changed under the condition of changing the length of the short circuit loading branch, and the odd mode resonance frequency and the even mode resonance frequency are influenced under the condition of changing the length of the branch of the interdigital structure of the composite left-right hand transmission line unit. The two channel paths of the duplexer based on the short-circuit branch loading type composite left-right hand resonator are mutually independent, the center frequency and the bandwidth of the first channel and the second channel can be independently regulated and controlled, and the application of the composite left-right hand transmission line unit also greatly reduces the volume of the duplexer based on the short-circuit branch loading type composite left-right hand resonator, so that the miniaturization of the duplexer is realized, and the frequency selectivity of the duplexer is improved by the application of the magnetic source load cross coupling line. Therefore, for the filtering requirements of different frequency bands, the filtering requirements can be met by performing parameter tuning on the duplexer based on the short-circuit stub loading type composite left-right-hand resonator without redesigning a new duplexer model, and the design time is shortened. In addition, the duplexer based on the short-circuit branch loading type composite left-right-hand resonator has the advantages of compact structure, small volume, simple manufacturing process, good design effect and the like, and is more universal in actual engineering design.
Claims (10)
1. The duplexer based on the short-circuit branch loading type composite left-right hand resonator is characterized by being provided with an upper-layer microstrip structure, a middle-layer dielectric substrate and a bottom-layer grounding plate;
the upper-layer microstrip structure comprises three input and output feeder lines, a short-circuit branch loading type composite left-right-hand resonator of a first channel, a short-circuit branch loading type composite left-right-hand resonator of a second channel, and square grounding patches which are distributed near the upper half circumference of the first and second channel short-circuit branch loading type composite left-right-hand resonators and the terminals of coupling lines, wherein a gap exists between the coupling lines and the short-circuit branch loading type composite left-right-hand resonators, and the centers above the short-circuit branch loading type composite left-right-hand resonators are connected with a bottom-layer grounding plate through the square grounding patches; one end of the feeder line is connected with the coupling line and is in a right-angle structure, and the other end of the feeder line is connected with the inner conductor of the coaxial cable;
the upper surface and the lower surface of the middle-layer dielectric substrate are respectively tightly attached to the upper-layer microstrip structure and the bottom-layer grounding plate, the bottom-layer grounding plate completely covers the lower surface of the middle-layer dielectric substrate, and the bottom-layer grounding plate is connected with the outer conductor of the coaxial cable; the short-circuit branch loaded type composite left-hand and right-hand resonators of the first channel and the short-circuit branch loaded type composite left-hand and right-hand resonators of the second channel are identical in structure but different in size.
2. The duplexer based on the short-circuit stub loaded composite left-right hand resonator according to claim 1, wherein the short-circuit stub loaded composite left-right hand resonator is composed of two composite left-right hand transmission line units and a short-circuit loading stub.
3. The duplexer based on the short-circuited stub-loaded composite left-right-handed resonator as claimed in claim 2, wherein the composite left-right-handed transmission line unit is composed of a capacitive interdigital structure and an inductive meander-type short-circuited stub, the number of the capacitive interdigital structure is 5, the length of the interdigital stub is 2.5-3.0 mm, and the width of the interdigital stub is 0.12-0.18 mm.
4. The duplexer based on the short-circuited stub-loaded composite left-right-handed resonator according to claim 3, wherein the terminals of the inductive meander-type short-circuited stub are connected to the bottom ground plane via a circular ground patch, the radius of the central via hole of the circular ground patch is 0.25-0.35 mm, the radius of the circular ground patch is 0.35-0.45 mm, and the total length of the inductive meander-type short-circuited stub is 6.5-10 mm.
5. The duplexer based on the short-circuit branch loading type composite left-right hand resonator as claimed in claim 1, wherein the short-circuit loading branch has a width of 0.7-0.9 mm and a length of 3.5-4.5 mm.
6. The duplexer based on the short-circuit stub loading type composite left-right hand resonator as claimed in claim 1, wherein the center of the tail end of the short-circuit loading stub is connected with the bottom ground plate through a circular metal via hole, the center of the circular metal via hole is 0.4-0.5 mm away from the tail end of the short-circuit loading stub, and the radius of the circular metal via hole is 0.25-0.35 mm.
7. The duplexer based on the short-circuit stub loaded composite left-right hand resonator according to claim 1, wherein the width of the coupling line is 0.2-0.3 mm, and the distance between the coupling line and the short-circuit stub loaded composite left-right hand resonator is 0.1-0.2 mm; the coupling lines extend along the outline of the short-circuit branch loading type composite left-right-hand resonator, and the total length of each coupling line is 6-10 mm; the terminal of two coupling lines respectively connected with the feeder lines of the first port and the second port is connected with the bottom ground plate through a square ground patch, the radius of a central through hole of the square ground patch is 0.25-0.35 mm, and the side length of the square metal patch is 0.8-1.0 mm.
8. The duplexer based on the short-circuited stub-loaded composite left-right-hand resonator as claimed in claim 1, wherein three input/output feeders are respectively connected to a first port, a second port and a third port of the duplexer based on the short-circuited stub-loaded composite left-right-hand resonator, the first port to the second port form a first channel transmission path, and the first port to the third port form a second channel transmission path; the feeder line connected with the first port is split into two feeder lines with the same width as the original feeder line at a position short of the port, and the two feeder lines are respectively connected with the input ports of the first channel and the second channel.
9. The duplexer based on the short-circuit branch loading type composite left-right hand resonator as claimed in claim 1, wherein the feeder line is a 50 Ω microstrip feeder line, and the length of the feeder line is 4-8 mm; the characteristic impedance of the coaxial cable is 50 Ω.
10. The duplexer based on the short-circuit branch loading type composite left-right hand resonator as claimed in claim 1, wherein the middle layer dielectric substrate is a cuboid, the long side of the cuboid is 14-17 mm, the wide side of the cuboid is 13-16 mm, the height of the cuboid is 0.508mm, the relative dielectric constant of the middle layer dielectric substrate is 3.48, the relative permeability of the middle layer dielectric substrate is 1, and the loss tangent angle of the middle layer dielectric substrate is 0.004.
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