CN104051830A - Multimode broadband band-pass filter - Google Patents
Multimode broadband band-pass filter Download PDFInfo
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- CN104051830A CN104051830A CN201410286490.6A CN201410286490A CN104051830A CN 104051830 A CN104051830 A CN 104051830A CN 201410286490 A CN201410286490 A CN 201410286490A CN 104051830 A CN104051830 A CN 104051830A
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- 230000005540 biological transmission Effects 0.000 claims abstract description 43
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- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000004891 communication Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
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Abstract
The invention discloses a multimode broadband band-pass filter, which is realized in a microstrip form and comprises a microstrip substrate, a bottom layer ground and a top layer microstrip circuit, wherein the microstrip substrate is formed on the bottom layer ground, and the top layer microstrip circuit is formed on the microstrip substrate; the top-layer microstrip circuit comprises an input tap, an output tap and a multimode resonator, wherein the multimode resonator is connected between the input tap and the output tap. The invention adopts direct connection mode to feed, and the feed point is connected with the input/output transmission line by using a shorter gradually-changed transmission line. The filter provided by the invention has the advantages of simple and compact structure, convenience in manufacturing and suitability for microwave circuits.
Description
Technical field
The present invention relates to microstrip filter technical field, particularly a kind of multimode broadband band-pass filter.
Background technology
Filter is for suppressing the indispensable important passive device of interference signal in wireless communication system.Along with the fast development of radio communication, for the requirement of communication channel capacity, grow with each passing day, need to improve with the broadband filter of the Wideband Signal Processing the channel capacity of whole system.
Fast development along with radio communication, the fast development of new material, new technology and semiconductor technology, make the integrated level of radio frequency, microwave, millimetre-wave circuit more and more higher, volume is more and more less, and because the particularity of filter generally cannot be mutually integrated with other functional circuits, how designing the filter of high-performance, miniaturization, is one of key link of microwave current, millimetre-wave circuit design.
The broadband filter that micro-band is realized adopts interdigital or pectinate line structure to realize mostly, but this class filter all needs ground connection, can inevitably face the interference of other circuit when the system integration.Owing to adopting coupled modes cascade, insertion loss is larger in addition.
In order to realize good stopband suppression characteristic, make filter have less insertion loss simultaneously.Adopting a small amount of resonant element and the outer transmission zero of band is one of effective execution mode of commonly using the most.
Summary of the invention
(1) technical problem that will solve
In view of this, main purpose of the present invention is to provide a kind of multimode broadband band-pass filter, to solve the larger problem of broadband filter insertion loss of traditional manifold type.
(2) technical scheme
For achieving the above object, the invention provides a kind of multimode broadband band-pass filter, this multimode broadband band-pass filter adopts micro-band forms to realize, and comprises microstrip substrate, bottom and top layer microstrip circuit, microstrip substrate is formed on bottom ground, and top layer microstrip circuit is formed on microstrip substrate; Wherein, top layer microstrip circuit comprises input tap, output tap and multimode resonator, and this multimode resonator is connected between input tap and output tap.
In such scheme, described multimode resonator comprises: the direct-connected transmission line of U-shaped; Be connected to the first low-resistance open-circuit line 4 and the second low-resistance open-circuit line 5 of the direct-connected transmission line two arm ends of U-shaped; And high impedance end route 3, one end is connected in centre position, U-shaped direct-connected transmission line bottom, and the other end has grounding through hole 6, and this high impedance end route 3 is parallel to two arms of the direct-connected transmission line of U-shaped.
In such scheme, described input tap and output tap are connected to the end of direct-connected transmission line two arms of described U-shaped.Between described input tap or output tap and the end of direct-connected transmission line two arms of described U-shaped, adopt the transmission line of gradual change.
In such scheme, the characteristic impedance of described the first low-resistance open-circuit line 4 and the second low-resistance open-circuit line 5 is less than 40, and its electrical length is 1/2 wavelength at centre frequency place.Described the first low-resistance open-circuit line 4 and the second low-resistance open-circuit line 5 adopt uniform transmission line or stepped impedance transmission line.
In such scheme, described input tap and output tap are the transmission line of 50 ohm of characteristic impedances.
In such scheme, the relative dielectric constant 1-100 of described microstrip substrate, thickness is 0.05-5mm.
(3) beneficial effect
From technique scheme, can find out, the present invention has following beneficial effect:
1, multimode broadband band-pass filter provided by the invention, compact conformation, size are little, can reduce area occupied with the system integration, meet the requirement that realizes miniaturization communication system.
2, multimode broadband band-pass filter provided by the invention, produces four resonant modes at passband, is beneficial to and realizes broadband character.In addition, it produces a plurality of transmission zeros outside band, can improve stopband suppression characteristic.
3, multimode broadband band-pass filter provided by the invention, adopts direct-connected mode feed, and simplicity of design reduces design complexities, shortens the construction cycle.
Accompanying drawing explanation
Fig. 1 is the schematic diagram according to the multimode broadband band-pass filter of the embodiment of the present invention.
Fig. 2 is the schematic diagram of multimode resonator in Fig. 1.
Fig. 3 carries out the result figure of emulation testing to the multimode broadband band-pass filter shown in Fig. 1.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
As shown in Figure 1, Fig. 1 is the schematic diagram according to the multimode broadband band-pass filter of the embodiment of the present invention.This multimode broadband band-pass filter adopts micro-band forms to realize, and comprises microstrip substrate, bottom and top layer microstrip circuit, and microstrip substrate is formed on bottom ground, and top layer microstrip circuit is formed on microstrip substrate; Wherein, top layer microstrip circuit comprises input tap, output tap and multimode resonator, and this multimode resonator is connected between input tap and output tap.The relative dielectric constant 1-100 of microstrip substrate, thickness is 0.05-5mm.
Fig. 2 is the schematic diagram of multimode resonator in Fig. 1.This multimode resonator comprises: the direct-connected transmission line of U-shaped; Be connected to the first low-resistance open-circuit line 4 and the second low-resistance open-circuit line 5 of the direct-connected transmission line two arm ends of U-shaped; And high impedance end route 3, one end is connected in centre position, U-shaped direct-connected transmission line bottom, and the other end has grounding through hole 6, and this high impedance end route 3 is parallel to two arms of the direct-connected transmission line of U-shaped.
Input tap and output tap are connected to the end of direct-connected transmission line two arms of described U-shaped.Between described input tap or output tap and the end of direct-connected transmission line two arms of described U-shaped, adopt the transmission line of gradual change.Input tap and output tap are the transmission line of 50 ohm of characteristic impedances.
The characteristic impedance of the first low-resistance open-circuit line 4 and the second low-resistance open-circuit line 5 is less than 40, and its electrical length is 1/2 wavelength at centre frequency place.The first low-resistance open-circuit line 4 and the second low-resistance open-circuit line 5 adopt uniform transmission line or stepped impedance transmission line.
In the present embodiment, microstrip substrate relative dielectric constant 3.55, thickness 0.508mm.
As shown in Figure 1, the multimode broadband band-pass filter of the embodiment of the present invention, it forms by inputting tap, output tap and multimode resonator.Multimode resonator is realized by folding hairpin-type resonator center loaded short-circuit line, and specifically as shown in Figure 2, multimode resonator consists of T-shaped transmission circuit network and Low ESR open-circuit line.T-shaped transmission circuit network comprises direct-connected transmission line (1,2) and high impedance end route 3, and direct-connected transmission line is folded into U-shaped and connects endways the first and second low-resistance open-circuit lines (4,5).The characteristic impedance of Low ESR open-circuit line is less than 40, and length is about 1/2 wavelength at centre frequency place.
Low-resistance open-circuit line (4,5) is connected in the end of direct-connected transmission line two arms of U-shaped, and its tie point is feedback point.Input tap or output tap adopt the transmission line of 50 ohm of characteristic impedances, and between input tap or output tap and feedback point, the shorter gradual change transmission line of employing is connected.Adopt direct-connected mode directly to connect input tap or output tap at the end of direct-connected transmission line two arms of U-shaped, adopt direct-connected mode feed, improved reliability.
As shown in Figure 3, Fig. 3 carries out the result figure of emulation testing to the multimode broadband band-pass filter shown in Fig. 1.The emulation of embodiment of the present invention and test result frequency characteristic comprise: S11 and S21, and abscissa represents frequency variable, unit is GHz; Ordinate represents amplitude variable, and unit is dB.Dotted line represents simulation result, realizes and represents test result.As seen from Figure 3, band pass filter centre frequency 5.6GHz of the present invention, produces transmission zero raising stopband printing characteristic at 3.6GHz, 6.85GHz and 9.8GHz place.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. a multimode broadband band-pass filter, it is characterized in that, this multimode broadband band-pass filter adopts micro-band forms to realize, and comprises microstrip substrate, bottom and top layer microstrip circuit, microstrip substrate is formed on bottom ground, and top layer microstrip circuit is formed on microstrip substrate;
Wherein, top layer microstrip circuit comprises input tap, output tap and multimode resonator, and this multimode resonator is connected between input tap and output tap.
2. multimode broadband band-pass filter according to claim 1, is characterized in that, described multimode resonator comprises:
The direct-connected transmission line of U-shaped;
Be connected to the first low-resistance open-circuit line (4) and the second low-resistance open-circuit line (5) of the direct-connected transmission line two arm ends of U-shaped; And
High impedance end route (3), one end is connected in centre position, U-shaped direct-connected transmission line bottom, and the other end has grounding through hole (6), and this high impedance end route (3) is parallel to two arms of the direct-connected transmission line of U-shaped.
3. multimode broadband band-pass filter according to claim 2, is characterized in that, described input tap and output tap are connected to the end of direct-connected transmission line two arms of described U-shaped.
4. multimode broadband band-pass filter according to claim 3, is characterized in that, adopts the transmission line of gradual change between described input tap or output tap and the end of direct-connected transmission line two arms of described U-shaped.
5. multimode broadband band-pass filter according to claim 2, is characterized in that, the characteristic impedance of described the first low-resistance open-circuit line (4) and the second low-resistance open-circuit line (5) is less than 40, and its electrical length is 1/2 wavelength at centre frequency place.
6. multimode broadband band-pass filter according to claim 2, is characterized in that, described the first low-resistance open-circuit line (4) and the second low-resistance open-circuit line (5) adopt uniform transmission line or stepped impedance transmission line.
7. multimode broadband band-pass filter according to claim 1, is characterized in that, described input tap and output tap are the transmission line of 50 ohm of characteristic impedances.
8. multimode broadband band-pass filter according to claim 1, is characterized in that, the relative dielectric constant 1-100 of described microstrip substrate, and thickness is 0.05-5mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410286490.6A CN104051830A (en) | 2014-06-24 | 2014-06-24 | Multimode broadband band-pass filter |
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| CN201410286490.6A CN104051830A (en) | 2014-06-24 | 2014-06-24 | Multimode broadband band-pass filter |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102544652A (en) * | 2012-01-18 | 2012-07-04 | 华南理工大学 | Ultra-wide-band filter with high selectivity and ultrahigh attenuation band restrain effect |
| CN102569954A (en) * | 2012-01-16 | 2012-07-11 | 电子科技大学 | Ultra-wideband microstrip filter |
| CN102881972A (en) * | 2012-07-04 | 2013-01-16 | 上海大学 | Miniaturized UWB filter based on interdigital capacitor |
| CN202930515U (en) * | 2012-12-04 | 2013-05-08 | 哈尔滨飞羽科技有限公司 | Rectangular ring multi-mode resonator-based microstrip wide-band filter |
| CN203056059U (en) * | 2013-01-28 | 2013-07-10 | 南京理工大学 | Radio frequency reconfigurable band-pass filter with wide frequency and wide bandwidth adjusting range |
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2014
- 2014-06-24 CN CN201410286490.6A patent/CN104051830A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102569954A (en) * | 2012-01-16 | 2012-07-11 | 电子科技大学 | Ultra-wideband microstrip filter |
| CN102544652A (en) * | 2012-01-18 | 2012-07-04 | 华南理工大学 | Ultra-wide-band filter with high selectivity and ultrahigh attenuation band restrain effect |
| CN102881972A (en) * | 2012-07-04 | 2013-01-16 | 上海大学 | Miniaturized UWB filter based on interdigital capacitor |
| CN202930515U (en) * | 2012-12-04 | 2013-05-08 | 哈尔滨飞羽科技有限公司 | Rectangular ring multi-mode resonator-based microstrip wide-band filter |
| CN203056059U (en) * | 2013-01-28 | 2013-07-10 | 南京理工大学 | Radio frequency reconfigurable band-pass filter with wide frequency and wide bandwidth adjusting range |
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Application publication date: 20140917 |