CN106058399A - Bandpass filter with wide stopband - Google Patents
Bandpass filter with wide stopband Download PDFInfo
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- CN106058399A CN106058399A CN201610319630.4A CN201610319630A CN106058399A CN 106058399 A CN106058399 A CN 106058399A CN 201610319630 A CN201610319630 A CN 201610319630A CN 106058399 A CN106058399 A CN 106058399A
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- coupling
- coupling line
- filter
- band
- line
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/212—Frequency-selective devices, e.g. filters suppressing or attenuating harmonic frequencies
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Abstract
The invention discloses a bandpass filter with a wide stopband. The bandpass filter includes a first coupling input unit, a second center coupling unit and a third coupling output unit. The bandpass filter, through adjusting the lengths of each section of a coupled line and a fan-shaped stub, is enabled to separately suppress 3 different harmonic frequencies so as to extend a stopband. According to the invention, the bandpass filter can be used for microwave and millimeter wave communication systems and is advantaged by simple design, light weight, low cost, easy integration and fast processing period.
Description
Technical field
The invention belongs to microwave and millimeter wave passive device technical field, particularly relate to the band in microwave and millimeter wave passive device
Bandpass filter.
Background technology
Band filter is the Primary Component in wireless communication system, and it only allows the signal in passband pass through, and to band outside
Signal suppression.Along with the fast development of Modern Communication System, frequency spectrum resource becomes more and more crowded.Therefore, in wireless system
Band filter need in the widest frequency band range, suppress the interference signal from other communication systems.
For the stopband range of expansion bands bandpass filter, Minra Akra et al. discloses a kind of based on putting down that minor matters load
Band filter (Minra Akra, Emmanuel Pistono, Hamza Issa, the Akil Jrad and of row coupling line
Philippe Ferrari,“Full Study of the Parallel-Coupled Stub-Loaded Resonator:
Synthesis Method in a Narrow Band With an Extended Optimal Rejection
Bandwidth,”IEEE Transactions On Microwave Theory and Techniques,vol.62,
Pp.3380-3392,2014), the purpose of harmonic wave is reached to suppress by adjusting the position of transmission zero.But this structure is deposited
Coupling Characteristics difficulty between each section of coupling line, the shortcoming that design is complicated.Xiu Yin Zhang et al. discloses one
Band-pass filter with wide stop band (Xiuyin Zhang, Xin Dai, Hsuan-Ling Kao, Bai-Hong of based on differentiated coupling
Wei,Ze Yu Cai and Quan Xue,“Compact LTCC Bandpass Filter With Wide Stopband
Using Discriminating Coupling,”IEEE Transactions On Microwave Theory and
Techniques, vol.4, pp.656-662,2014), suppress certain first harmonic by the coupled structure using differentiated.But
It is that this structure exists stopband suppression narrow range, the shortcoming that difficulty of processing is big, cycle length, cost are high.
Summary of the invention
It is an object of the invention to overcome above-mentioned prior art design complexity, difficulty of processing is big, cycle length, cost are high not
Foot, it is provided that the band filter of a kind of Wide stop bands, on the premise of realizing Wide stop bands, have that design is easy simultaneously, be prone to processing,
The advantage of low cost.
For achieving the above object, the technical scheme is that the band filter of a kind of Wide stop bands, including band metal ground
Medium substrate, band filter printed circuit；Band filter printed circuit is attached to medium substrate upper surface；Its feature exists
In: described band filter printed circuit is single by the first coupling input block, the second central coupling elements and the 3rd coupling output
Unit is constituted；First coupling input block is by the fan-shaped minor matters of filter input end, first paragraph coupling line, second segment coupling line and first
Constituting, first paragraph coupling line and second segment coupling line are sequentially connected with, and the first fan-shaped minor matters are connected to the bottom right of second segment coupling line
Angle, filter input end is connected to first paragraph coupling line and the junction of second segment coupling line；Second central coupling elements is by two
Individual end is consisted of the coupling line of two plated-through hole ground short circuits, the port of the second coupling line upper right side and the second center
The port of coupling unit upper left side is connected；3rd coupling output unit is by filter output, the 3rd section of coupling line, the 4th section of coupling
Zygonema and the second fan-shaped minor matters are constituted；3rd coupling output unit and the first coupling input block are about the second central coupling elements
Symmetry, structure is identical.
Further, the electrical length sum of described first coupling input block and the second central coupling elements is at bandpass filtering
Electrical length at device mid frequency is 90 degree, from the symmetry of structure, the 3rd coupling output unit and the second center coupling
Close the electrical length at the electrical length sum frequency of heart in the band-pass filter of unit and be also 90 degree.
Further, described first paragraph coupling line, second segment coupling line, the 3rd section of coupling line and the 4th section of coupling line
Two lines width can equal can also be unequal；The two lines width of the second central coupling elements is equal.
Further, for avoiding intersecting with the second central coupling elements, the described first fan-shaped minor matters, the second fan-shaped minor matters are divided
Not to the left, rotate a certain angle to the right.
The principle of technical solution of the present invention is: due to the inherent character of short circuit 1/4th minor matters, it can only broadcast center
The signal of frequency odd-multiple, the signal of even-multiple is curbed natively.So, only need to curb mid frequency even-multiple
Signal, it is possible to realize whole suppression of harmonic signal.The two ends of the 3rd section of coupling line are short circuit groundings, thus can make
/ 4th resonators for short circuit.The electrical length adjusting first paragraph coupling line makes it be the quarter-wave of a certain odd harmonic
Long.The corresponding a certain odd of electrical length that the length adjusting second segment coupling line makes second segment coupling line total with first paragraph coupling line is humorous
The quarter-wave of ripple.The electrical length adjusting the first fan-shaped minor matters makes the quarter-wave of its corresponding a certain odd harmonic.
The length finally adjusting the 3rd section of coupling line makes first paragraph coupling line, second segment coupling line and the 3rd section of electrical length that coupling line is total
Centered by quarter-wave at frequency.Thus can realize the suppression of three odd harmonics.
Advantages of the present invention and beneficial effect:
(1) advantage that the present invention has Wide stop bands.The harmonic number of existing employing differentiated strap bandpass filter suppression
Less, and this invention can suppress the seventh harmonic, extended stopband range.
(2) compared with traditional SIR band filter, the present invention has the simple advantage of design.Traditional SIR wave filter
Needing, from coupling matrix, to need constantly to adjust the coefficient of coup of every part, design is complicated, the cycle is long.The logical filter of this band
Ripple device need not the theory analysis of complexity, simple in construction, it is easy to design.
(3) band filter of the present invention is owing to using printed circuit board technology to carry out production and processing, and therefore the present invention's is double
Multiplexer low cost, lightweight, process-cycle is fast, be easily integrated；
Accompanying drawing explanation
Fig. 1 is the population structure schematic diagram of the present invention
Fig. 2 is a specific embodiment emulation and the actual measurement S parameter of the present invention
Detailed description of the invention
The present invention will be further described with specific embodiment below in conjunction with the accompanying drawings: as it is shown in figure 1, the band of a kind of Wide stop bands
Bandpass filter, including dielectric substrate 1, and the circuit 2 being printed on dielectric substrate.Dielectric substrate 1 uses thick 0.508mm, is situated between
Electric constant is 3.5, and loss tangent angle is 0.0018, and copper layer thickness is the RF35 dielectric substrate of 0.018mm, a size of 12*35mm；
The selected a diameter of 0.8mm of plated-through hole.The a length of 7.8mm of first paragraph coupling line, second segment coupling line a length of
10.98m, a length of 2.84mm of the 3rd section of coupling line, the length of two fan-shaped minor matters is 3.93mm.3rd section of coupling line
Width is 0.8mm, and gap is 0.52mm.The live width of remaining coupling line is 0.2mm and 1.2mm, and gap is 0.1mm.Test result
Showing, the mid frequency of this band filter is 1.97GHz, a width of 0.195GHz of corresponding band.Insertion at mid frequency is damaged
Consumption is 1.6dB.To 7.22f0Place, high-frequency suppressing degree is more than 44.5dB.
Those of ordinary skill in the art it will be appreciated that embodiment described here be to aid in reader understanding this
Bright principle, it should be understood that protection scope of the present invention is not limited to such special statement and embodiment.This area
Those of ordinary skill can make various other various tools without departing from the present invention according to these technology disclosed by the invention enlightenment
Body deformability and combination, these deformation and combination are the most within the scope of the present invention.
Claims (4)
1. a band filter for Wide stop bands, including medium substrate (1), the band filter printed circuit (2) on band metal ground；
Band filter printed circuit (2) is attached to medium substrate (1) upper surface；It is characterized in that: described band filter printing electricity
Road (2) is made up of the first coupling input block (21), the second central coupling elements (22) and the 3rd coupling output unit (23)；The
One coupling input block (21) is by filter input end (210), first paragraph coupling line (211), second segment coupling line (212) and the
One fan-shaped minor matters (213) are constituted, and first paragraph coupling line (211) and second segment coupling line (212) are sequentially connected with, the first fan-shaped minor matters
(213) being connected to the lower right corner of second segment coupling line (212), filter input end (210) is connected to first paragraph coupling line (211)
Junction with second segment coupling line (212)；Second central coupling elements (22) is passed through two plated-through holes by two ends
(221) coupling line of ground short circuit is constituted, and the port of the second coupling line (212) upper right side and the second central coupling elements (22) are left
The port of upside is connected；3rd coupling output unit (23) by filter output (230), the 3rd section of coupling line (231), the 4th
Section coupling line (232) and the second fan-shaped minor matters (233) are constituted；3rd coupling output unit (23) couples input block with first
(21) symmetrical about the second central coupling elements (22), structure is identical.
The band filter of a kind of Wide stop bands the most according to claim 1, it is characterised in that: described first coupling input is single
Electrical length at the electrical length sum frequency of heart in the band-pass filter of unit (21) and the second central coupling elements (22) is 90
Degree, from the symmetry of structure, the 3rd coupling output unit (23) and the electrical length sum of the second central coupling elements (22)
Electrical length at frequency of heart is also 90 degree in the band-pass filter.
The band filter of Wide stop bands the most according to claim 1, it is characterised in that: described first paragraph coupling line (211),
The two lines width of second segment coupling line (212), the 3rd section of coupling line (231) and the 4th section of coupling line (232) can equal also
Can be unequal；The two lines width of the second central coupling elements (22) is equal.
The band filter of Wide stop bands the most according to claim 1, it is characterised in that: for avoiding coupling list with the second center
Unit (22) intersects, described first fan-shaped minor matters (213), the second fan-shaped minor matters (233) the most to the left, to the certain angle of right rotation
Degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610319630.4A CN106058399B (en) | 2016-05-13 | 2016-05-13 | A kind of band-pass filter with wide stop band |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610319630.4A CN106058399B (en) | 2016-05-13 | 2016-05-13 | A kind of band-pass filter with wide stop band |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106058399A true CN106058399A (en) | 2016-10-26 |
| CN106058399B CN106058399B (en) | 2019-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610319630.4A Active CN106058399B (en) | 2016-05-13 | 2016-05-13 | A kind of band-pass filter with wide stop band |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602187A (en) * | 2017-01-09 | 2017-04-26 | 华南理工大学 | Planar band-pass filter with wide stop-band suppression |
| CN109378559A (en) * | 2018-10-24 | 2019-02-22 | 中山大学 | A kind of radio-frequency filter with periodic structure |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151588A (en) * | 2013-02-27 | 2013-06-12 | 西安电子工程研究所 | Micro wave and micro band band-pass filter for miniature and ultra-width stop band |
-
2016
- 2016-05-13 CN CN201610319630.4A patent/CN106058399B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151588A (en) * | 2013-02-27 | 2013-06-12 | 西安电子工程研究所 | Micro wave and micro band band-pass filter for miniature and ultra-width stop band |
Non-Patent Citations (2)
| Title |
|---|
| CONG TANG等: "Wide stopband bandpass filters based on quarter-wavelength resonators", 《ET MICROWAVES ANTENNAS & PROPAGATION》 * |
| DAOTONG LI等: "A Novel UWB Bandpass Filter Based on Quadruple-mode Resonator", 《2005 IEEE INTERNATIONAL WIRELESS SYMPOSIUM》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602187A (en) * | 2017-01-09 | 2017-04-26 | 华南理工大学 | Planar band-pass filter with wide stop-band suppression |
| CN109378559A (en) * | 2018-10-24 | 2019-02-22 | 中山大学 | A kind of radio-frequency filter with periodic structure |
| CN109378559B (en) * | 2018-10-24 | 2019-09-24 | 中山大学 | A kind of radio-frequency filter with periodic structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106058399B (en) | 2019-04-16 |
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