CN103779640B - Micro-band double-passband filter - Google Patents
Micro-band double-passband filter Download PDFInfo
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- CN103779640B CN103779640B CN201410019987.1A CN201410019987A CN103779640B CN 103779640 B CN103779640 B CN 103779640B CN 201410019987 A CN201410019987 A CN 201410019987A CN 103779640 B CN103779640 B CN 103779640B
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Abstract
The invention discloses a kind of micro-band double-passband filter for radio ultra wide band system and narrowband systems, belong to wireless communication technology field.The micro-band double-passband filter of the present invention, comprises the first filter and second filter of share common feeder line and input/output port; First filter comprises the first resonator, the second resonator and the 3rd resonator that adopt interdigital linear structure composition, produces the first passband; Described second filter comprises the U-shaped resonator that the first resonator, the 3rd resonator and centre position load the 3rd short circuit minor matters, produces the second passband; The first to three resonator is all positioned at U-shaped resonator, and the short-circuit end of the 3rd short circuit minor matters overlaps with the short-circuit end of the second resonator; First resonator and the 3rd resonator are the high impedance feeder line of the second filter.The parameter of two passbands of the present invention independently adjusts, and passband has very high frequency selectivity and very high isolation, and its circuit structure is compact, and Insertion Loss is relatively little, improves communication quality.
Description
Technical field
The present invention relates to a kind of double-passband filter, be specifically a kind of micro-band double-passband filter being applied to radio ultra wide band system and narrowband systems, belong to wireless communication technology field.
Background technology
Along with the extensive use of the develop rapidly of modern communication technology, particularly WLAN (wireless local area network), the while of energy, many passbands communication system of the compatible present various communication resource has become the focus of research.At present, modal is dual-passband communication system, and double-passband filter is as the requisite device in front end of dual-passband communication system, becomes the key of research dual-passband communication system.
The method for designing of double-passband filter is a lot, mainly contains two kinds: the first adopts the single resonator with turnable resonator frequency, and the filter major defect that this method obtains is that the bandwidth of two passbands cannot independent regulation; The second is the different resonator of employing two kinds, and make it share identical input and output side, the filter obtained like this two bandwidth can regulate mutually.The filter adopting second method to design in currently available technology has very complicated circuit structure usually, and the comb filter being particularly applied to broadband or radio ultra wide band system is relatively little.
On June 20th, 2012, Chinese invention patent application CN102509822A discloses a kind of Double-band-pass microstrip filter, as shown in Figure 1, comprise the first different sub-microstrip filter of two groups of structures and the second sub-microstrip filter, and first signal transmssion line and secondary signal transmission line, this first signal transmssion line is connected and connection signal input with this first sub-microstrip filter and the second sub-microstrip filter respectively, this secondary signal transmission line is connected and connection signal output with this first sub-microstrip filter and the second sub-microstrip filter respectively, make this first sub-microstrip filter and the second sub-microstrip filter parallel connection.This Double-band-pass microstrip filter can centre frequency, the bandwidth sum band internal characteristic of independent regulation two passbands, but its internal circuit complex structure, Insertion Loss are comparatively large, frequency selectivity is poor, relatively poor at isolation between passband.
Summary of the invention
Technical problem to be solved by this invention is to overcome above-mentioned defect, provides that a kind of structure is simple, frequency selectivity good, the micro-band double-passband filter being applied to radio ultra wide band system and narrowband systems that isolation between passband is higher.
In order to solve the problems of the technologies described above, micro-band double-passband filter provided by the invention, comprises the first filter and second filter of share common feeder line and input/output port; Described first filter comprises the first resonator, the second resonator and the 3rd resonator that adopt interdigital linear structure composition, produces the first passband; Described second filter comprises the U-shaped resonator that the first resonator, the 3rd resonator and centre position load the 3rd short circuit minor matters, produces the second passband; Described the first to three resonator is all positioned at U-shaped resonator, and the short-circuit end of the 3rd short circuit minor matters overlaps with the short-circuit end of the second resonator; Described first resonator and the 3rd resonator are the high impedance feeder line of the second filter.
In the present invention, described common feeder comprises the first feeder line and the second feeder line; One end of described first feeder line and the second feeder line is connected with the short-circuit end of the 3rd resonator is vertical respectively with the first resonator, and the other end is respectively as the first filter and the common input/output end port of the second filter.
In the present invention, also comprise the first short circuit minor matters, the second short circuit minor matters, described first short circuit minor matters are carried on the first feeder line, produce a transmission zero at the lower limb of the first passband; Described second short circuit minor matters are carried on the second feeder line, produce a transmission zero at the top edge of the second passband.
In the present invention, also comprise to be positioned at outside the first short circuit minor matters, for reversion L-type structure the 4th resonator and to be positioned at outside the second short circuit minor matters, be the 5th resonator of forward L-type structure; The short-circuit end of described 4th resonator is contrary with the short-circuit end position of the first short circuit minor matters, produces a transmission zero in the upper edge of the first passband; The short-circuit end of described 5th resonator is contrary with the short-circuit end position of the second short circuit minor matters, produces a transmission zero in the lower edge of the second passband.
In the present invention, described first feeder line and the second feeder line, near place's formation source-load coupling, produce a transmission zero in the lower edge of the first passband.
In the present invention, be coupled between described first resonator and the 3rd resonator, produce a transmission zero in the upper edge of the second passband.
In the present invention, the length of described the first to three resonator is identical, and its length is 1/4th of the first passband centre frequency corresponding wavelength.
In the present invention, the length of described U-shaped resonator is 1/2nd of the second passband centre frequency corresponding wavelength.
In the present invention, the length of described 4th resonator and the 5th resonator is respectively 1/4th of two transmission zero frequency corresponding wavelength of the first passband upper edge and the second passband lower edge.
Beneficial effect of the present invention is: the parameter of (1), the present invention's two passbands independently adjusts, and passband has very high frequency selectivity and very high isolation; (2), double-passband filter of the present invention by common resonant device, feeder line and input/output port, make circuit structure compact, Insertion Loss is relatively little, improves communication quality.
Accompanying drawing explanation
Fig. 1 is a kind of Double-band-pass microstrip filter of the prior art;
Fig. 2 is the printed circuit board (PCB) tangent plane schematic diagram of the micro-band double-passband filter of the present invention;
Fig. 3 is the structural representation that the micro-band double-passband filter of the present invention is positioned at medium substrate upper strata;
Fig. 4 is the structural representation of the first filter in the micro-band double-passband filter of the present invention;
Fig. 5 is the structural representation of the second filter in the micro-band double-passband filter of the present invention;
Fig. 6 is the grounding through hole schematic diagram that the micro-band double-passband filter of the present invention is positioned at medium substrate lower floor;
Fig. 7 is the scattering parameter curve of the first filter separate responses in the micro-band double-passband filter of the present invention;
Fig. 8 is the scattering parameter curve of the second filter separate responses in the micro-band double-passband filter of the present invention;
Fig. 9 is the scattering parameter simulate and test result of the micro-band double-passband filter of the present invention;
Figure 10 is group delay emulation and the test result of the micro-band double-passband filter of the present invention;
In figure: 1, the first feeder line; 2, the second feeder line; 3, the first resonator; 4, the second resonator; 5, the 3rd resonator; 6, the 4th resonator; 6-1, the first grounding through hole; 7, the 5th resonator; 7-1, the second grounding through hole; 8, U-shaped resonator; 9, the first short circuit minor matters; 9-1, the 3rd grounding through hole; 10, the second short circuit minor matters; 10-1, the 4th grounding through hole; 11, the 3rd short circuit minor matters; 12, the 5th grounding through hole; 13, source-load coupling region; S1, medium substrate; S2, upper strata metal; S3, lower metal; P1, input port/output port; P2, output port/input port.
Embodiment
Below in conjunction with accompanying drawing, micro-band double-passband filter that the present invention is applied to radio ultra wide band system and narrowband systems is described in further detail.Wherein, ultra broadband passband is that the radio ultra wide band system of 3.1GHz illustrates for example with centre frequency; Narrow bandpass illustrates for the wireless local area network (WLAN) system of centre frequency at 5.2GHz.
As shown in Figure 2, in the printed circuit board (PCB) of the micro-band double-passband filter of the present invention, its relative dielectric constant is 2.2, and thickness is 0.508mm, can certainly adopt the medium substrate of other specifications.Be coated with metal level S2 and lower metal layer S3 respectively on the upper and lower surface of the dielectric substrate S1 of medium substrate, the filter in the present invention is formed at upper metal layers, and lower metal layer forms ground plane.
As shown in Figure 3, the present invention's micro-band double-passband filter comprises the first feeder line 1, second feeder line 2, first resonator 3, second resonator 4, the 3rd resonator 5, the 4th resonator 6, the 5th resonator 7, U-shaped resonator 8, first short circuit minor matters 9, second short circuit minor matters 10, the 3rd short circuit minor matters 11.As shown in Figure 4, the first feeder line 1, second feeder line 2, first resonator 3, second resonator 4, the 3rd resonator 5 form the first filter, produce the first passband.Interdigital linear structure is adopted to arrange between first resonator 3, second resonator 4, the 3rd resonator 5, its length is the centre frequency of the 1/4th, first passband of the first passband central frequency corresponding wavelength and bandwidth is adjusted by the first resonator 3, second resonator 4, the length of the 3rd resonator 5 and the spacing between them.First resonator 3, second resonator 4, the 3rd resonator 5 all have an open circuit termination and short circuit termination, wherein the first resonator 3 is connected with one end of the second feeder line 2 is vertical with the first feeder line 1 respectively with the short circuit termination of the 3rd resonator 5, the other end of the first feeder line 1 and the second feeder line 2 is respectively as input and output port (input/output port can exchange) P1, P2, first feeder line 1 is identical with input and output port P1, P2 impedance with the characteristic impedance of the second feeder line 2, all the other microstrip circuitry impedances are identical, and namely width is identical; The short circuit termination of the second resonator 4 is by the short circuit of connection the 5th grounding through hole 12.As shown in Figure 5, the U-shaped resonator 8 of the first feeder line 1, second feeder line 2, first resonator 3 and the 3rd resonator 5 and center loaded the 3rd short circuit minor matters 11 forms the second filter, produces the second passband; The length of U-shaped resonator 8 is that the centre frequency of the 1/2nd, second passband of the second passband centre frequency corresponding wavelength and bandwidth can regulate respectively by the length of U-shaped resonator 8 and the 3rd short circuit minor matters 11.As shown in Figure 3, first filter and the second filter have identical feeder line and input/output port, first resonator 3, second resonator 4, the 3rd resonator 5 are all positioned at U-shaped resonator 8, first resonator 3 and the 3rd resonator 5 provide close coupling as the high impedance feeder line of the second filter, 3rd short circuit minor matters 11 load on centre position in U-shaped resonator 8,3rd short circuit minor matters 11 short-circuit end overlaps with the short circuit termination of the second resonator 4, realizes by connecting the 5th grounding through hole 12.As shown in Fig. 3,4,5, the first feeder line 1 and second feeder line 2 place close to each other formation source-load coupling 13, can form a transmission zero in the lower edge of the first passband; Coupling between first resonator 3 and the 3rd resonator 5 can produce a transmission zero in the upper edge of the second passband.As shown in Figure 3, the first short circuit minor matters 9 load on the first feeder line 1, one end open circuit termination, and other end short circuit termination, by the 3rd grounding through hole 9-1 short circuit, can produce a transmission zero at the first passband lower limb; Second short circuit minor matters 10 load on the second feeder line 2, one end open circuit termination, and other end short circuit termination, by the 4th grounding through hole 10-1 short circuit, can produce a transmission zero at the top edge of the second passband; 4th resonator 6 and the 5th resonator 7 are bending type resonator, wherein the 4th resonator 6 adopts the L-type structure of reversion, the outside being positioned at the first short circuit minor matters 9 is coupled with it, its short at one end terminal is by the first grounding through hole 6-1 short circuit, the other end is open circuit termination, and the short-circuit end position of its short-circuit end and the first short circuit minor matters 9 is contrary, can produce a transmission zero in the upper edge of the first passband, the length of the 4th resonator 6 is 1/4th of this transmission zero frequency corresponding wavelength.5th resonator 7 adopts the L-type structure of forward, the outside being positioned at the second short circuit minor matters 10 is coupled with it, its short at one end terminal is by the second grounding through hole 7-1 short circuit, the other end is open circuit termination, and its short-circuit end is contrary with the short-circuit end position of the second short circuit minor matters 10, can produce a transmission zero in the lower edge of the second passband, the length of the 5th resonator 7 is 1/4th of this transmission zero frequency corresponding wavelength.Above-mentioned transmission zero, can improve the frequency selectivity of passband, and the isolation between two passbands.
As shown in Figure 6, the medium substrate lower floor of double-passband filter of the present invention, wherein the first grounding through hole 6-1 is the short-circuit end of the 4th resonator 6, second grounding through hole 7-1 is the short-circuit end of the 5th resonator 7,3rd grounding through hole 9-1 is the short-circuit end of the first short circuit minor matters 9,4th grounding through hole 10-1 is the short-circuit end of the second short circuit minor matters 10, and the 5th grounding through hole 12 is short-circuit ends that the second resonator 4 and the 3rd short circuit minor matters 11 have.
As shown in Figure 7, the first passband produced under first filter separate responses of the micro-band double-passband filter of the present invention, its passband central frequency is 3.1GHz, and its 3dB relative bandwidth is 70%, there is a transmission zero respectively at the lower limb of passband and upper edge, improve frequency selectivity.
As shown in Figure 8, the second passband produced under second filter separate responses of the micro-band double-passband filter of the present invention, its passband central frequency is 5.2GHz, 3dB relative bandwidth is 4.5%, have a transmission zero in the upper edge of passband, and the U-shaped resonator being loaded with the 3rd short circuit minor matters creates a transmission zero because parity mode is cancelled out each other below passband.
As shown in Figure 9, as can be seen from the figure simulation result and test result and simulation result coincide good.First passband central frequency is at 3.1GHz, and its 3dB relative bandwidth reaches 73.2%, and in passband, its return loss is all less than 10dB; Second passband central frequency, at 5.2GHz, is applied to wireless local area network (WLAN) system, and its 3dB relative bandwidth is 4.8%.Two transmission zeros are had respectively in the lower edge of the first passband and the upper edge of the second passband, the upper edge of the first passband and the upper edge of the second passband are respectively by a transmission zero, drastically increase the isolation between the frequency selectivity of passband and passband, this shows that double-passband filter of the present invention has very good performance.
For broadband and ultra-wide band filter, group delay characterizes it to the parameter of the delay character that signal causes.As shown in Figure 10, be 0.4ns to 0.7ns when can find out the first passband (ultra broadband passband) the interior group of filter, group delay is very little, and has very smooth characteristic.
Output port P1 and the input port P2 of micro-band double-passband filter of the present invention all adopt SMA head to weld, so that access is tested or is connected with circuit.
The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, can also make some improvement under the premise without departing from the principles of the invention, and these improvement also should be considered as protection scope of the present invention.
Claims (7)
1. a micro-band double-passband filter, is characterized in that: the first filter and the second filter that comprise share common feeder line and input/output port; Described first filter comprises the first resonator (3), the second resonator (4) and the 3rd resonator (5) that adopt interdigital linear structure composition, produces the first passband; Described second filter comprises the U-shaped resonator (8) that the first resonator (3), the 3rd resonator (5) and centre position load the 3rd short circuit minor matters (11), produces the second passband; Described the first to three resonator (3,4,5) is all positioned at U-shaped resonator (8), and the short-circuit end of the 3rd short circuit minor matters (11) overlaps with the short-circuit end of the second resonator (4); Described first resonator (3) and the 3rd resonator (5) are the high impedance feeder line of the second filter; Comprise the first short circuit minor matters (9), the second short circuit minor matters (10), described first short circuit minor matters (9) are carried on the first feeder line (1), produce a transmission zero at the lower limb of the first passband; Described second short circuit minor matters (10) are carried on the second feeder line (2), produce a transmission zero at the top edge of the second passband; Comprise be positioned at the first short circuit minor matters (9) outside, for reversion L-type structure the 4th resonator (6) and to be positioned at outside the second short circuit minor matters (10), be the 5th resonator (7) of forward L-type structure; The short-circuit end of described 4th resonator (6) is contrary with the short-circuit end position of the first short circuit minor matters (9), produces a transmission zero in the upper edge of the first passband; The short-circuit end of described 5th resonator (7) is contrary with the short-circuit end position of the second short circuit minor matters (10), produces a transmission zero in the lower edge of the second passband.
2. micro-band double-passband filter according to claim 1, is characterized in that: described common feeder comprises the first feeder line (1) and the second feeder line (2); Described first feeder line (1) is connected with the short-circuit end of the 3rd resonator (5) is vertical respectively with the first resonator (3) with one end of the second feeder line (2), the other end is respectively as the first filter and common I/O (P1, the P2) port of the second filter.
3. micro-band double-passband filter according to claim 1 and 2, is characterized in that: described first feeder line (1) and the second feeder line (2), near place's formation source-load coupling, produce a transmission zero in the lower edge of the first passband.
4. micro-band double-passband filter according to claim 3, is characterized in that: be coupled between described first resonator (3) and the 3rd resonator (5), produce a transmission zero in the upper edge of the second passband.
5. micro-band double-passband filter according to claim 4, is characterized in that: the length of the described first to the 3rd resonator (3,4,5) is identical, and its length is 1/4th of the first passband centre frequency corresponding wavelength.
6. micro-band double-passband filter according to claim 5, is characterized in that: the length of described U-shaped resonator (8) is 1/2nd of the second passband centre frequency corresponding wavelength.
7. micro-band double-passband filter according to claim 6, is characterized in that: the length of described 4th resonator (6) and the 5th resonator (7) is respectively 1/4th of two transmission zero frequency corresponding wavelength of the first passband upper edge and the second passband lower edge.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105207639A (en) * | 2014-06-19 | 2015-12-30 | 中兴通讯股份有限公司 | Planar filter device |
| CN104201450B (en) * | 2014-07-04 | 2017-03-29 | 电子科技大学 | A kind of micro band superwide band band filter with trap characteristic |
| CN105070998B (en) * | 2015-08-27 | 2018-05-15 | 华南理工大学 | A kind of miniaturization cross-connect with filter function |
| CN106602185B (en) * | 2016-12-07 | 2019-10-11 | 中国船舶重工集团公司第七一九研究所 | A kind of double-passband filter based on Nonsymmetric Short Circuit minor matters load resonator |
| CN115425376B (en) * | 2022-09-29 | 2023-09-08 | 河南科技大学 | Double-passband filter based on branch loading |
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