CN217903405U - Double-passband filter based on composite left-right-hand characteristics - Google Patents
Double-passband filter based on composite left-right-hand characteristics Download PDFInfo
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- CN217903405U CN217903405U CN202221581642.1U CN202221581642U CN217903405U CN 217903405 U CN217903405 U CN 217903405U CN 202221581642 U CN202221581642 U CN 202221581642U CN 217903405 U CN217903405 U CN 217903405U
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Abstract
The utility model discloses a dual-band filter based on composite left-right hand characteristics, which comprises a dielectric substrate, wherein the bottom of the dielectric substrate is provided with a metal grounding layer, a resonance structure is integrated on the dielectric substrate, one end of the resonance structure is connected with an input feeder, and the other end of the resonance structure is connected with an output feeder; the resonance structure comprises four open-circuit composite left-right-hand resonance units which are distributed in a central symmetrical structure, and a short-circuit branch structure is cascaded between two adjacent open-circuit composite left-right-hand resonance units. The utility model is suitable for centimeter wave frequency band, especially suitable for the radio frequency front end filtering of specific meteorological radar, not only can receive normal working signal and resist the airborne high altitude complex environment, but also has better diffraction and reduces transmission loss compared with millimeter wave; the size of the resonance structure is small, the size of the microstrip dual-passband filter can be reduced, the microstrip filter is convenient to integrate into a receiver, the return loss is low, and the cost is low.
Description
Technical Field
The utility model relates to a microwave radio frequency communication technical field specifically is a dual-passband filter based on compound left and right hands characteristic.
Background
The development of the meteorological radar receiving technology not only plays an extremely important role in atmospheric monitoring and meteorological prediction in China, but also has important significance in monitoring disaster areas and alarming disasters. The mechanism of the weather radar is relatively fixed, and the airborne weather radar is mainly used for detecting the existence and distribution condition of weather targets and other targets on a navigation path in front of an airplane and displaying the outline of the detected targets, the strength, the direction, the distance and the like of a thunderstorm area on a display. The working principle is that electromagnetic waves are reflected back when encountering barriers after being radiated by the antenna, and the higher the conductivity coefficient of a target is, the larger the reflecting surface is, the stronger the echo is. The corresponding front-end hardware structure is a core component of the system, the traditional filter part adopts a waveguide structure, but the size is large, the processing difficulty is large, and the carrying difficulty of the equipment is large for an airborne radar, so that the front-end mechanical hardware equipment of the meteorological radar receiver is researched, especially a preselection filter positioned in a working frequency band, the purpose of manufacturing the filter which is miniaturized and has excellent stop band inhibition performance is achieved, and certain help is provided for the development and optimization of the meteorological radar receiver equipment.
With the rise and development of radio technology, many scientific and technological fields are integrated, the development of microwave devices is continuously promoted, and the operating frequency of the microwave devices is continuously improved. The trend is that the number of mobile users is increasing, mobile communication is more and more widely applied in various fields, different communication frequency bands are occupied by different functional requirements, and accordingly occupied wireless frequency bands are higher and higher, and therefore the working frequency bands of radio frequency devices are also tending to higher frequency bands. With the frequency bands being more and more occupied, the miniaturization with high integration level is also an important development trend of microwave devices in the complex electromagnetic environment of everything interconnection.
In the prior art, the evaluation of single cell composite right-left hand transmission line for ultra wideband band (International Journal of Technology) discloses a single-section composite left-right hand unit microstrip interdigital capacitor structure, which is formed by six-finger interdigital capacitors, has a compact structure, the working frequency is 3.93GHz to 9.2GHz, the return loss is 10dB, the resonance unit is 4.2mm × 4.2mm, the area of a dielectric substrate is limited by the area of a grounding layer, and the large area of the dielectric substrate is wasted; a novel printed log-periodic diode array based on composite right-left transmitted line (active Technologies and Methods in MEMS Design) discloses a log periodic dipole printed array antenna based on a composite right-left transmission line, which adopts a coplanar strip (CPS) transmission line technology and an embedded composite left-right hand transmission line technology, and the whole filter size is 62.5mm multiplied by 50mm through the shortest dipole feeding, the bandwidth of the antenna is 700MHz-1020MHz, the size is smaller compared with that of a microwave antenna with a broadband, but the return loss is about-18 dB. The limitation in Bandwidth and Unit Cell Size of Composite Right-Left Transmission Line based Leaky-Wave Antenna (European Conference on Antennas & Propagation) discusses the optimum resonant Unit Size of a Leaky-Wave Antenna based on a Composite Right-Left Transmission Line, the Leaky-Wave Antenna is formed by adding an aperture to a single short-circuit branch, the simulation test center frequency is about 2GHz, the echo loss is-16 dB, the final design Unit Size is 13.53 mm in Unit length, the total length of the structure is 107.24 mm, the inherent defect that a microstrip Line is exposed as a resonant Unit is high in loss, and the Size development trend is to be as compact as possible.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned technical problem that exists among the prior art, the utility model provides a dual band filter based on compound left and right hands characteristic, reasonable in design has overcome prior art not enough, has good effect.
In order to realize the purpose of the utility model, the utility model adopts the following technical scheme:
a dual-passband filter based on composite left-right-hand characteristics comprises a dielectric substrate, wherein a metal grounding layer is arranged at the bottom of the dielectric substrate, a resonant structure is integrated on the dielectric substrate, one end of the resonant structure is connected with an input feeder, and the other end of the resonant structure is connected with an output feeder; the resonance structure comprises four open-circuit composite left-right-hand resonance units, the four open-circuit composite left-right-hand resonance units are distributed in a central symmetry structure, and a short-circuit branch structure is cascaded between every two adjacent open-circuit composite left-right-hand resonance units.
Furthermore, the open-circuit composite left-right hand resonance unit is composed of four interdigital coupling lines which are arranged in parallel.
Furthermore, the short-circuit branch structure further comprises four copper columns, each short-circuit branch is provided with a grounding through hole, each copper column penetrates through the grounding through hole and is embedded in the dielectric substrate, and the lower end of each copper column is in contact with the metal grounding layer.
Furthermore, in the resonance structure, the open-circuit composite left-right-hand resonance units at the left end and the right end are respectively connected with the input feeder line and the output feeder line, and the interdigital coupling line is perpendicular to the input feeder line and the output feeder line.
Further, the input feeder and the output feeder are respectively connected with the lumped ports on the side face of the dielectric substrate.
The utility model discloses the beneficial technological effect who brings:
the utility model provides a dual-passband filter is applicable to centimeter wave frequency band, especially is applicable to the radio frequency front end filtering of specific meteorological radar, not only can receive normal working signal and resist the airborne high-altitude complex environment, but also has better diffraction and reduces transmission loss than millimeter wave; the size of the resonance structure is small, the size of the microstrip dual-passband filter can be reduced, the microstrip filter is convenient to integrate into a receiver, the return loss is low, and the cost is low.
Drawings
Fig. 1 is a perspective view of a dual band filter based on a composite right-left hand characteristic according to the present invention;
fig. 2 is a top view of a dual band filter based on a composite right-left hand characteristic according to the present invention;
FIG. 3 is a diagram of a basic equivalent Bessel filter circuit in the prior art;
FIG. 4 is a structural diagram of an equivalent circuit after transformation of the composite right-left hand transmission line of the present invention;
fig. 5 is a simulation diagram of the S11 parameter of the filter under excitation according to the present invention;
fig. 6 is a simulation diagram of S21 parameter of the filter under excitation according to the present invention;
wherein, 1-a dielectric substrate; 2-an open-circuit composite left-right hand resonance unit; 3-interdigital coupling lines; 4-short circuit branch; 5-input feeder; 6-output feeder; 7-copper columnar bodies; 8-a ground via;
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
a dual-passband filter based on composite left-right hand characteristics is disclosed, as shown in fig. 1 and fig. 2, and comprises a dielectric substrate, a Rogers5880 material with the thickness of 0.508mm and the relative dielectric constant of 2.2, the size of the Rogers5880 material is 10.95mm multiplied by 10.98mm, a metal grounding layer is arranged at the bottom of the dielectric substrate, a resonance structure is integrated on the dielectric substrate, the resonance structure comprises four open-circuit composite left-right hand resonance units which are distributed in a central symmetry structure, the open-circuit composite left-right hand resonance units are formed by four interdigital coupling lines arranged in parallel, and a short-circuit branch structure with the length of 1.34mm is cascaded between two adjacent open-circuit composite left-right hand resonance units; the two opposite open-circuit composite left-right-hand resonance units are respectively connected with an input feeder line and an output feeder line, the interdigital coupling line is perpendicular to the input feeder line and the output feeder line, the input feeder line and the output feeder line are respectively connected with lumped ports on the side surface of the dielectric substrate, and the lumped ports are connected with metal interfaces which are required to be connected in the final test;
the structure also comprises four copper columns, each short circuit branch is provided with a grounding through hole, the radius r of the grounding through hole is 0.375mm, each copper column penetrates through the grounding through hole to be embedded in the dielectric substrate, and the lower end of each copper column is in contact with the metal grounding layer.
Specifically, the input feeder and the output feeder are 50 Ω feeders, one end of the resonant structure is connected with the input feeder for tap feeding, and the other end is connected with the output feeder for tap feeding;
FIG. 3 is a block diagram of a substantially equivalent Bessel filter circuit featuring a flat amplitude and linear phase (i.e., uniform group delay) response in its passband, but passing amplitude and frequencyThe characteristics obviously show that the gain effect of the pass band is not good, and the selectivity of the two pass bands is poor, so that a five-order Bessel circuit is made, and a composite left-right-hand characteristic improved circuit is applied on the basis of the five-order Bessel circuit to obtain a more ideal filtering effect, and fig. 4 is a structure diagram of an equivalent circuit after transformation of a composite left-right-hand transmission line. The equivalent principle is that L3, C3, L1, C1, L4 and C4 form a resonance structure part of the composite left-right hand filter, wherein C3 and L3 are equivalent capacitors of a four-finger interdigital coupling line structure and parasitic inductors of the four-finger interdigital coupling line structure respectively to form a series structure. L1, C1, L4, C4 are the ground inductance and its parasitic capacitance that the both ends base plate upper strata metal and ground plane constitute parallel structure respectively. The coupling resonance generated by the left and right transmission feed lines is equivalent to L2, C2, L5 and C5. The circuit is characterized in that the circuit presents a left-handed characteristic at a lower frequency, and the impedance of the series part is formed by a series capacitor C 3 Acting, the parallel part being formed by a parallel inductance L 1 、L 4 Acting to thereby exhibit a high-pass characteristic with a cut-off frequency of w L The expression is shown below, and the right-hand characteristic is shown at higher frequency, and the impedance of the series part is formed by a series inductor L 3 Acting, the parallel part being formed by a parallel capacitor C 1 、C 4 Is operative to thereby exhibit a low-pass characteristic with a cut-off frequency of w R The expression thereof is as follows. Due to the characteristics of the Bessel circuit, the filter band of the filter is low, and the phase response is nearly linear.
FIG. 5 and FIG. 6 show the s11 parameter and s21 parameter of a dual-passband filter with a composite left-right-handed resonant structure, respectively, which can be obtained from the figure, wherein the filter has two distinct passbands, and the passbands range from 9.6GHz-12GHz and 18GHz-21GHz, and the filter has strong specificity according to the limitation of the dual-passband range, and is particularly suitable for the radio frequency front-end filtering of a specific meteorological radar. The return loss is about 10dB, and the filtering work requirement is met.
Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and the changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also belong to the protection scope of the present invention.
Claims (5)
1. A dual-passband filter based on composite left-right-hand characteristics is characterized by comprising a dielectric substrate, wherein a metal grounding layer is arranged at the bottom of the dielectric substrate, a resonance structure is integrated on the dielectric substrate, one end of the resonance structure is connected with an input feeder, and the other end of the resonance structure is connected with an output feeder; the resonance structure comprises four open-circuit composite left-right-hand resonance units which are distributed in a central symmetrical structure, and a short-circuit branch structure is cascaded between two adjacent open-circuit composite left-right-hand resonance units.
2. The dual-passband filter based on the composite left-right-hand characteristic as claimed in claim 1, wherein the open-circuit composite left-right-hand resonant unit is composed of four interdigital coupling lines arranged in parallel.
3. The dual-passband filter based on composite left-right-hand characteristics according to claim 1, further comprising four copper cylinders, wherein each short-circuit branch is provided with a grounding through hole, each copper cylinder penetrates through the grounding through hole and is embedded in the dielectric substrate, and the lower end of the copper cylinder is in contact with the metal grounding layer.
4. The dual-passband filter based on the composite left-right-hand characteristic as claimed in claim 2, wherein in the resonant structure, the open-circuit composite left-right-hand resonant units at the left and right ends are respectively connected with the input feeder line and the output feeder line, and the interdigital coupling line is perpendicular to the input feeder line and the output feeder line.
5. A dual band-pass filter based on composite left and right hand features according to claim 4, wherein the input feed line and the output feed line are respectively connected to lumped ports on the side of the dielectric substrate.
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| CN202221581642.1U CN217903405U (en) | 2022-06-23 | 2022-06-23 | Double-passband filter based on composite left-right-hand characteristics |
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| CN202221581642.1U CN217903405U (en) | 2022-06-23 | 2022-06-23 | Double-passband filter based on composite left-right-hand characteristics |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066024A (en) * | 2018-08-13 | 2018-12-21 | 电子科技大学 | A kind of big frequency based on mode composite transmission line compares double-passband filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066024A (en) * | 2018-08-13 | 2018-12-21 | 电子科技大学 | A kind of big frequency based on mode composite transmission line compares double-passband filter |
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