CN204289665U - A kind of double frequency band-pass filter based on electromagnetism hybrid coupled - Google Patents
A kind of double frequency band-pass filter based on electromagnetism hybrid coupled Download PDFInfo
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- CN204289665U CN204289665U CN201520002822.3U CN201520002822U CN204289665U CN 204289665 U CN204289665 U CN 204289665U CN 201520002822 U CN201520002822 U CN 201520002822U CN 204289665 U CN204289665 U CN 204289665U
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Abstract
The utility model discloses a kind of double frequency band-pass filter based on electromagnetism hybrid coupled, its structure is: the lower surface of dielectric substrate (7) is covered by metal level completely, the metal level of upper surface comprises the first input and output feeder line (1), second input and output feeder line (2), first double-frequency resonance device (3), second double-frequency resonance device (4), interdigital capacitor (5), short circuit minor matters (6), the plated-through hole (34) in dielectric substrate (7) connects the metal level of upper and lower surface.Both produce electric coupling by interdigital capacitor (5) between first double-frequency resonance device (3) and the second double-frequency resonance device (4), also produce magnetic coupling by short circuit minor matters (6).The advantage of this hybrid coupled is, electric coupling can regulate separately first pass band width, and magnetic coupling can regulate separately second pass band width.The utility model compact conformation, be easy to integrated, the process-cycle is fast, can be used for the effect playing He Ne laser in double frequency transceiver.
Description
Technical field
The utility model relates to a kind of double frequency band-pass filter, belongs to microwave passive component technical field.
Background technology
Along with the fast development of wireless communication technology, people constantly propose new communication standard and the new technology of exploitation, and such as, from early stage GSM, CDMA, WCDMA TD-SCDMA, WLAN, WiMAX etc. till now, frequency range divides more and more thinner.The while of energy, the multiband communication system of the compatible existing various communication resource becomes study hotspot.Adopt multiband transceiver, compared with the multiple one-segment transceiver of employing, owing to have employed multifrequency antenna, multiband filter, the multifrequency front-end devices such as multifrequency low noise amplifier, the volume of system can reduce over half, share due to a lot of device or reuse, system power dissipation also decreases, and effectively can also reduce hardware cost simultaneously.
Double frequency filter, can the various unwanted signal of filtering and noise signal effectively as one of Primary Component in double frequency transceiver, ensures the normal work of system.Its method for designing, generally speaking, can be divided into two classes.The first kind utilizes the parasitic frequency of resonator to design multiband filter.Its advantage is that therefore the overall dimensions of filter can be very compact because resonator can simultaneously two frequency resonances.Its shortcoming is that will to meet the bandwidth requirement of two passbands more difficult simultaneously.Equations of The Second Kind utilizes two filter banks design double frequency filters, and this is comprising band pass filter and the combination of band stop filter, the combination of multiple band pass filter.Although this method can realize the bandwidth requirement of two passbands simultaneously, its filter size can be much larger than the size of first kind filter.Generally speaking, existing double frequency band-pass filter is difficult to both meet small size simultaneously, meets again the requirement that two pass band widths can regulate simultaneously, needs improvement badly.
Summary of the invention
The purpose of this utility model proposes a kind of double frequency band-pass filter based on electromagnetism hybrid coupled, the shortcoming that the bandwidth overcoming existing double frequency band-pass filter two passbands not easily regulates.
The technical solution of the utility model is: a kind of double frequency band-pass filter based on electromagnetism hybrid coupled, the lower surface of its dielectric substrate is covered by metal level completely, the metal level of upper surface comprises the first input and output feeder line, second input and output feeder line, first double-frequency resonance device, the second double-frequency resonance device, interdigital capacitor, short circuit minor matters, the plated-through hole in dielectric substrate connects the metal level of upper and lower surface.
Further, first, second input and output feeder line is 50 ohm microstrip corresponding to particular substrate parameter, is connected respectively with in the middle part of the first high impedance microstrip line of first, second resonator; First resonator and the second resonator symmetrical, by Low ESR microstrip line, the first high impedance microstrip line, the second high impedance microstrip line, through hole form; Low ESR microstrip line one end is connected with interdigital capacitor, the other end and the first high impedance microstrip line, the other end of the first high impedance microstrip line is connected to ground by through hole, and the second high impedance microstrip line is folding line, its one end is connected to the middle part of the first high impedance line, and the other end is connected with short circuit minor matters.
Advantage of the present utility model and beneficial effect:
(1) the utility model has the advantage of compact conformation; Because each resonator of this filter can, simultaneously at the centre frequency resonance of two passbands, not need to use more resonator on the one hand; Owing to bending the second high impedance line on the other hand.
(2) centre frequency of the utility model two passbands is easy to regulate; Regulate high impedance microstrip line and Low ESR micro belt line width, just can regulate the impedance ratio between them, thus the centre frequency of filter two passbands can be regulated neatly; Or regulate the length of high impedance microstrip line and Low ESR microstrip line, also can reach effect same.
(3) bandwidth of the utility model two passbands can regulate respectively; Regulate the width in the gap of interdigital capacitor, the capacitance size of interdigital capacitor can be changed, thus change the size of electric coupling, first pass band width size can be regulated like this, keep second pass band width constant simultaneously; And regulate the length of short circuit minor matters, just can change the size of its equivalent inductance, thus change magnetic-coupled size, second pass band width size can be regulated like this, keep first pass band width constant simultaneously.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described further: as shown in Figure 1, a kind of double frequency band-pass filter based on electromagnetism hybrid coupled, the lower surface of its dielectric substrate 7 is covered by metal level completely, the metal level of upper surface comprises the first input and output feeder line 1, second input and output feeder line 2, first double-frequency resonance device 3, second double-frequency resonance device 4, interdigital capacitor 5, short circuit minor matters 6, the plated-through hole 34 in dielectric substrate 7 connects the metal level of upper and lower surface.
Further, first, second input and output feeder line 1,2 is 50 ohm microstrip corresponding to particular substrate parameter, is connected respectively with in the middle of the first high impedance microstrip line 32 of first, second resonator; First resonator 3 and the second resonator 4 symmetrical, by Low ESR microstrip line 31, first high impedance microstrip line 32, second high impedance microstrip line 33, through hole 34 forms, one end of Low ESR microstrip line 31 is connected with interdigital capacitor 5, the other end is connected with the first high impedance microstrip line 32, and the other end of the first high impedance microstrip line 32 is connected to ground by through hole 34, and the second high impedance microstrip line 33 is folding line, its one end is connected to the centre of the first high impedance line 32, and the other end is connected with short circuit minor matters 6.
The principle of the technical solution of the utility model is: the first double-frequency resonance device 3 and the second double-frequency resonance device 4 all can at two resonate at frequencies, the length of suitable adjustment Low ESR microstrip line 31, first high impedance microstrip line 32, second high impedance microstrip line 33 and width, just can make two of resonator resonance frequencys be positioned at the centre frequency place of two passbands of filter.And be coupled by interdigital capacitor 5 and short circuit minor matters 6 between the first resonator 3 with the second resonator 4.Wherein, interdigital capacitor 5 provides electric coupling, and short circuit minor matters 6 provide magnetic coupling, is coupled as hybrid coupled therefore between two resonators.Regulate the width in the gap of interdigital capacitor 5, its equivalent capacity can be changed, thus change the size of electric coupling, first pass band width size can be regulated like this, keep second pass band width constant simultaneously.And regulate the length of short circuit minor matters 6, just can change its equivalent inductance, thus change magnetic-coupled size, second pass band width size can be regulated like this, keep first pass band width constant simultaneously.By the physical parameter of interdigital capacitor 5 and short circuit minor matters 6, the bandwidth of two passbands can be controlled.
For further illustrating the exploitativeness of technique scheme, provide a specific design example below, a kind of double frequency band-pass filter based on electromagnetism hybrid coupled.Dielectric substrate uses thickness to be 0.8mm, dielectric constant is the F4B substrate of 2.55, test result shows, the centre frequency of this double frequency filter two passbands is respectively 2.48GHz and 5.71GHz, corresponding bandwidth is 0.38GHz and 0.23GHz, be respectively 0.81dB and 2.3dB at the insertion loss at centre frequency place, return loss is all greater than 20dB.Whole circuit is of a size of long 16.8mm, wide 11.2mm, high 0.8mm, and structure closely.
Those of ordinary skill in the art will appreciate that, embodiment described here is to help reader understanding's principle of the present utility model, should be understood to that protection range of the present utility model is not limited to so special statement and embodiment.Those of ordinary skill in the art can make according to these technology enlightenment disclosed in the utility model and variously not depart from other various concrete distortion and combination of the present utility model, and these distortion and combination are still in protection range of the present utility model.
Claims (2)
1. the double frequency band-pass filter based on electromagnetism hybrid coupled, it is characterized in that: the lower surface of dielectric substrate (7) is covered by metal level completely, the metal level of upper surface comprises the first input and output feeder line (1), second input and output feeder line (2), first double-frequency resonance device (3), second double-frequency resonance device (4), interdigital capacitor (5), short circuit minor matters (6), the plated-through hole (34) in dielectric substrate (7) connects the metal level of upper and lower surface.
2. the double frequency band-pass filter based on electromagnetism hybrid coupled according to claim 1, it is characterized in that: first, second input and output feeder line (1), (2) are 50 ohm microstrip corresponding to particular substrate parameter, be connected respectively with in the middle of the first high impedance microstrip line (32) of first, second resonator; First resonator (3) is symmetrical with the second resonator (4), by Low ESR microstrip line (31), first high impedance microstrip line (32), the second high impedance microstrip line (33), through hole (34) forms; One end of Low ESR microstrip line (31) is connected with interdigital capacitor (5), the other end is connected with the first high impedance microstrip line (32), the other end of the first high impedance microstrip line (32) is connected to ground by through hole (34), second high impedance microstrip line (33) is folding line, its one end is connected to the centre of the first high impedance line (32), and the other end is connected with short circuit minor matters (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520002822.3U CN204289665U (en) | 2015-01-04 | 2015-01-04 | A kind of double frequency band-pass filter based on electromagnetism hybrid coupled |
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| CN201520002822.3U CN204289665U (en) | 2015-01-04 | 2015-01-04 | A kind of double frequency band-pass filter based on electromagnetism hybrid coupled |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466321A (en) * | 2015-01-04 | 2015-03-25 | 电子科技大学 | Double-frequency band-pass filter based on electromagnetic mixed coupling |
| CN108736112A (en) * | 2017-04-14 | 2018-11-02 | 上海诺基亚贝尔股份有限公司 | Microwave electric coupling structure and its implementation |
| CN113991269A (en) * | 2021-09-18 | 2022-01-28 | 天津大学 | Miniaturized high-harmonic-suppression dual-passband filter based on dielectric integrated suspension line |
-
2015
- 2015-01-04 CN CN201520002822.3U patent/CN204289665U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466321A (en) * | 2015-01-04 | 2015-03-25 | 电子科技大学 | Double-frequency band-pass filter based on electromagnetic mixed coupling |
| CN104466321B (en) * | 2015-01-04 | 2017-02-22 | 电子科技大学 | Double-frequency band-pass filter based on electromagnetic mixed coupling |
| CN108736112A (en) * | 2017-04-14 | 2018-11-02 | 上海诺基亚贝尔股份有限公司 | Microwave electric coupling structure and its implementation |
| CN108736112B (en) * | 2017-04-14 | 2020-07-24 | 上海诺基亚贝尔股份有限公司 | Microwave electric coupling structure and implementation method thereof |
| CN113991269A (en) * | 2021-09-18 | 2022-01-28 | 天津大学 | Miniaturized high-harmonic-suppression dual-passband filter based on dielectric integrated suspension line |
| CN113991269B (en) * | 2021-09-18 | 2022-07-12 | 天津大学 | Miniaturized high-harmonic-suppression dual-passband filter based on dielectric integrated suspension line |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150422 Termination date: 20160104 |