CN203983428U - A kind of microstrip filter based on electromagnetism hybrid coupled - Google Patents
A kind of microstrip filter based on electromagnetism hybrid coupled Download PDFInfo
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- CN203983428U CN203983428U CN201420333414.1U CN201420333414U CN203983428U CN 203983428 U CN203983428 U CN 203983428U CN 201420333414 U CN201420333414 U CN 201420333414U CN 203983428 U CN203983428 U CN 203983428U
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Abstract
The utility model discloses a kind of microstrip filter based on electromagnetism hybrid coupled, comprise micro-band plate, also comprise the plated-through hole, the first resonator, the second resonator, the 3rd resonator, input port feeder line and the output port feeder line that are arranged on the ground connection on micro-band plate, one end of described first, second, third resonator is connected with plated-through hole, the first resonator, the 3rd resonator line centered by the second resonator are symmetrical arranged, and input port feeder line, output port feeder line are symmetricly set on respectively the outside of the first resonator, the 3rd resonator.Microstrip filter of the present utility model, can regulate the intensity of magnetic coupling and electric coupling, and then can control neatly the bandwidth of filter, and volume is little.
Description
Technical field
The utility model relates to microwave filter, particularly a kind of microstrip filter based on electromagnetism hybrid coupled.
Background technology
In recent years, the arrival of universal, the 4G of the high speed development of radio communication, 3G technology, all indicates that wireless technology will welcome a flourish peak period.Simultaneously along with wireless electronic product popularizing in people's lives, miniaturization, the low trend that has become electronic product of cost.On the other hand, along with the fast development of electronic information, the frequency spectrum resource that day is becoming tight is deficienter, and for improving message capacity and reducing signal cross-talk between adjacent channel, the selectivity to filter and integrated etc. is had higher requirement.Microstrip filter has met this ask for something.
Microstrip filter is as the important devices in microwave telecommunication system, the structure of its miniaturization and high performance feature have promoted its application, now being widely used in business and military field, is to be mobile communication, satellite communication, radar, electronic warfare and remote remote sensing etc. as microwave filter.
In prior art, in July, 2009, Chu Qingxin and Wang Huan application discloses the patent of " controllable electromagnetic coupling microstrip split-ring resonator filter ", employing be microstrip split-ring resonator, but electric coupling and magnetic coupling are to be interweaved, and are not independently.
In May, 2012, the Ou Yangxiao of South China Science & Engineering University has delivered the master thesis that is entitled as " research of hybrid electromagnetic coupling filter ", has adopted hybrid electromagnetic coupling opening ring wave filter, and wherein electric coupling and magnetic coupling equally can not independent regulation.
Therefore, people have a kind of new controlled microstrip filter of electric coupling magnetic coupling of Demand Design.
Utility model content
The purpose of this utility model is that the shortcoming that overcomes prior art is with not enough, a kind of microstrip filter based on electromagnetism hybrid coupled is provided, it has flexible design, volume is little, cost is low, the feature that characteristic is good, and by introducing controlled electric coupling and magnetic coupling, can control flexibly bandwidth, can regulate in a big way filter bandwidht.
The purpose of this utility model realizes by following technical scheme:
A kind of microstrip filter based on electromagnetism hybrid coupled, comprise micro-band plate, also comprise the plated-through hole, the first resonator, the second resonator, the 3rd resonator, input port feeder line and the output port feeder line that are arranged on the ground connection on micro-band plate, one end of described first, second, third resonator is connected with plated-through hole, the first resonator, the 3rd resonator line centered by the second resonator are symmetrical arranged, and input port feeder line, output port feeder line are symmetricly set on respectively the outside of the first resonator, the 3rd resonator.
Described the first resonator, the second resonator, the 3rd resonator are quarter-wave short circuit resonator, and the output port of the input port of input port feeder line and output port feeder line lays respectively at the first resonator, the 3rd resonator 1/4th resonator length places near open end.
The open end of the second described resonator is formed in parallel by two sections of transmission lines.Can shorten the size of the second resonator.
The first described resonator, the open end of the 3rd resonator, and the port of input port feeder line, output port feeder line is all folded into L shaped.Can dwindle the volume of microstrip filter.
Described input port feeder line, the port of output port feeder line are the matched impedance of 50 ohm.
Described micro-band plate is the micro-band plate of double-sided copper-clad, and described microstrip filter is produced on the one side of micro-band plate in the mode of printed circuit board (PCB), the another side ground connection of micro-band plate.
Described plated-through hole is connected with micro-one side with plate earthing by scolding tin.
Compared with prior art, tool has the following advantages and beneficial effect the utility model:
1, the external sort factor of microstrip filter can be by changing the length of input port feeder line, output port feeder line, and coupling between feeder line and resonator regulates.
2, three 1/4th resonators share a grounding through hole (being plated-through hole), change hole size and can effectively control magnetic-coupled intensity, and then control filter bandwidht; Between the open end of the first resonator and the second resonator, there is electric coupling between the 3rd resonator and the open end of the second resonator, regulate the gap between them can effectively control electric coupling.Regulate the intensity of magnetic coupling and electric coupling can control neatly the bandwidth of filter.
3, the utility model is introduced independent controllable electric coupling at the open end of resonator, and electric coupling and magnetic coupling can be cancelled out each other, and this structure is applicable to design narrow band filter very much.
4, because filter is microstrip structure, volume is little, lightweight, cost is low, be applicable to industrial mass manufacture, so the advantage that filter possesses is simple in structure, production cost is low.
Brief description of the drawings
Fig. 1 is the structural representation of a kind of microstrip filter based on electromagnetism hybrid coupled described in the utility model;
Fig. 2 is the structural parameters mark figure of microstrip filter described in Fig. 1;
Fig. 3 be described in Fig. 1 microstrip filter at different through-hole diameter return loss simulation result figure;
Fig. 4 is microstrip filter insertion loss simulation result figure under different through-hole diameters described in Fig. 1;
Fig. 5 is microstrip filter diameter return loss simulation result figure under different coupling gaps described in Fig. 1;
Fig. 6 is microstrip filter insertion loss simulation result figure under different coupling gaps described in Fig. 1.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited to this.
As Fig. 1, 2, a kind of microstrip filter based on electromagnetism hybrid coupled, comprise micro-band plate 1, also comprise the plated-through hole 3 that is arranged on the ground connection on micro-band plate 1, the first resonator 4, the second resonator 5, the 3rd resonator 6, input port feeder line 10 and output port feeder line 2, described first, second, one end of the 3rd resonator is connected with plated-through hole 3, the first resonator 4, the 3rd resonator 6 line centered by the second resonator 5 is symmetrical arranged, input port feeder line 10, output port feeder line 2 is symmetricly set on respectively the first resonator 4, the outside of the 3rd resonator 6,
Described the first resonator 4, the second resonator 5, the 3rd resonator 6 are quarter-wave short circuit resonator, and the output port of the input port of input port feeder line 10 and output port feeder line 2 lays respectively at the first resonator 4, the 3rd resonator 6 1/4th resonator length places near open end;
The open end of the second described resonator 5 is formed in parallel by two sections of transmission lines 7,8, between two ends transmission line 7,8 and the first resonator 4, the 3rd resonator 6, has gap 9;
The first described resonator 4, the open end of the 3rd resonator 6, and the port of input port feeder line 10, output port feeder line 2 is all folded into L shaped;
Described input port feeder line, the port of output port feeder line are the matched impedance of 50 ohm;
Described micro-band plate 1 is the micro-band plate of double-sided copper-clad, and described microstrip filter is produced on the one side of micro-band plate 1 in the mode of printed circuit board (PCB), the another side ground connection of micro-band plate;
Described plated-through hole 3 is connected with the one side of micro-band plate 1 ground connection by scolding tin.
Use three-dimensional artificial software ZELAND IE3D to carry out emulation to filter, the relative dielectric constant of micro-belt substrate that the filter of the utility model design uses is 2.55, medium height is 0.8, as Fig. 2, the main structure parameters of filter is: L2=13.05mm, L3=2.50mm, L4=1.15mm, W1=1mm, W2=0.15mm.L1 is input port feeder line length in addition, and L5 is the length of the 3rd resonator, L6 is the length of transmission line 8, and S1 is the gap of input port feeder line and the first resonator, and S2 is the gap of transmission line 7 and the first resonator, W3 is the width of output port feeder line, the diameter that D is plated-through hole.
Fig. 3, Fig. 4 have shown the scattering parameter simulation result of filter under different through-hole diameters, wherein Fig. 3 shows that microstrip filter is at different through-hole diameter return loss simulation results, its centre frequency is 3GHz, transverse axis represents the signal frequency of microstrip filter in the utility model, the longitudinal axis represents the return loss (S11) of filter, return loss represents the relation between the input power of this port signal and the reflection power of signal, and its corresponding mathematical function is as follows: reflection power/incident power==20*log|S11|.Fig. 4 shows microstrip filter insertion loss (S21) simulation result under different through-hole diameters, insertion loss represents the relation between the input power of a signal and the power output of another port signal, and its corresponding mathematical function is: power output/input power (dB)=20*log|S21|.
There are Fig. 3, Fig. 4 known: increase the radius D of through hole, the magnetic coupling between resonator diminishes, and filter bandwidht narrows.
Fig. 5,6 has shown the scattering parameter simulation result of (S2) filter under different coupling gaps, and its centre frequency is 3GHz.Fig. 5 is return loss simulation result, and Fig. 6 is insertion loss simulation result, from Fig. 5, Fig. 6, reduces coupling gap S2, and it is large that the electric coupling between resonator becomes, and can offset part magnetic coupling, and filter bandwidht narrows.
Above-described embodiment is preferably execution mode of the utility model; but execution mode of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection range of the present utility model.
Claims (7)
1. the microstrip filter based on electromagnetism hybrid coupled, comprise micro-band plate, it is characterized in that: also comprise the plated-through hole, the first resonator, the second resonator, the 3rd resonator, input port feeder line and the output port feeder line that are arranged on the ground connection on micro-band plate, one end of described first, second, third resonator is connected with plated-through hole, the first resonator, the 3rd resonator line centered by the second resonator are symmetrical arranged, and input port feeder line, output port feeder line are symmetricly set on respectively the outside of the first resonator, the 3rd resonator.
2. the microstrip filter based on electromagnetism hybrid coupled according to claim 1, it is characterized in that: described the first resonator, the second resonator, the 3rd resonator are quarter-wave short circuit resonator, the output port of the input port of input port feeder line and output port feeder line lays respectively at the first resonator, the 3rd resonator 1/4th resonator length places near open end.
3. the microstrip filter based on electromagnetism hybrid coupled according to claim 1, is characterized in that: the open end of the second described resonator is formed in parallel by two sections of transmission lines.
4. the microstrip filter based on electromagnetism hybrid coupled according to claim 1, is characterized in that: the first described resonator, the open end of the 3rd resonator, and the port of input port feeder line, output port feeder line is all folded into L shaped.
5. the microstrip filter based on electromagnetism hybrid coupled according to claim 1, is characterized in that: described input port feeder line, the port of output port feeder line are the matched impedance of 50 ohm.
6. the microstrip filter based on electromagnetism hybrid coupled according to claim 1, it is characterized in that: described micro-band plate is the micro-band plate of double-sided copper-clad, described microstrip filter is produced on the one side of micro-band plate in the mode of printed circuit board (PCB), the another side ground connection of micro-band plate.
7. the microstrip filter based on electromagnetism hybrid coupled according to claim 6, is characterized in that: described plated-through hole is connected with micro-one side with plate earthing by scolding tin.
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| CN201420333414.1U CN203983428U (en) | 2014-06-20 | 2014-06-20 | A kind of microstrip filter based on electromagnetism hybrid coupled |
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| CN201420333414.1U CN203983428U (en) | 2014-06-20 | 2014-06-20 | A kind of microstrip filter based on electromagnetism hybrid coupled |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104091981A (en) * | 2014-06-20 | 2014-10-08 | 华南理工大学 | Microstrip filter based on electromagnetic mixed coupling |
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2014
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104091981A (en) * | 2014-06-20 | 2014-10-08 | 华南理工大学 | Microstrip filter based on electromagnetic mixed coupling |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141203 Termination date: 20170620 |