CN104282969A - Band-stop microstrip line filter - Google Patents
Band-stop microstrip line filter Download PDFInfo
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- CN104282969A CN104282969A CN201410599269.6A CN201410599269A CN104282969A CN 104282969 A CN104282969 A CN 104282969A CN 201410599269 A CN201410599269 A CN 201410599269A CN 104282969 A CN104282969 A CN 104282969A
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Abstract
The invention discloses a band-stop microstrip line filter which comprises a substrate, an input transmission line, a sawtooth-shaped transmission line, an output transmission line, quarter elliptic round grounding plates and a square internally connected symmetric T-shaped coupling line. The center of the front side of the substrate is transversely provided with the sawtooth-shaped transmission line, the four corners of the front side of the substrate are provided with the quarter elliptic round grounding plates, one end of the sawtooth-shaped transmission line is connected with one end of the input transmission line, the other end of the input transmission line is connected with the left end of the substrate, the other end of the sawtooth-shaped transmission line is connected with one end of the output transmission line, and the other end of the output transmission line is connected with the right end of the substrate; the back side of the substrate is provided with the square internally connected symmetric T-shaped coupling line composed of 2*9 square internally connected symmetric T-shaped coupling line units, and each square internally connected symmetric T-shaped coupling line unit comprises a square ring and two T-shaped coupling line bodies. The band-stop microstrip line filter has the advantages of being good in filtering performance, low in insertion loss, simple in structure, small in size, convenient to manufacture and integrate and the like.
Description
Technical field
The present invention relates to microwave filter, particularly relate to a kind of band resistance microstripline filter.
Background technology
Along with the develop rapidly of the radiotechnics such as Radar Technology and radio communication, microwave radio Circuits and Systems are paid attention to more and more widely.Microwave filter is one of important component part wherein, and the quality of its performance largely determines the work quality of system.The system of various function is developed in succession, and microwave spectrum resource day is becoming tight, and frequency interval constantly reduces, and this just has higher requirement to filter.Wherein microstrip filter has superior performance with it, size is little, the design cycle is short, be easy to integrated, be easy to the advantages such as processing by photoetching technique is widely used.In recent years, the research and development of high-performance baseplate material make microstrip filter can be applied in very large frequency range, thus make the filter type that microstrip filter becomes the most frequently used.
Low pass filter and band stop filter are one of important compositions of filter, and it is used in the rear class of transmitting terminal prime or receiving terminal, for the unwanted high frequency band signal of filtering.Also a lot of document is had to be studied Wide stop bands band stop filter in recent years, Wide stop bands band stop filter when having that band internal loss is low, little, the advantage such as reflection coefficient is little of fluctuating, also has very wide stopband, can effectively suppress high frequency spurious signal, be an important directions of current filter development.
Summary of the invention
The invention provides a kind of band resistance microstripline filter, technical scheme is as follows:
Band resistance microstripline filter comprise substrate, input transmission line, zigzag transmission line, export transmission line, 1/4th oval ground plates, square in connect symmetrical T-shaped coupling line; Substrate front side central cross is provided with zigzag transmission line, substrate front side corner is provided with 1/4th oval ground plates, zigzag transmission line one end is connected with input transmission line one end, the input transmission line other end is connected with substrate left end, the zigzag transmission line other end is connected with output transmission line one end, exports the transmission line other end and is connected with substrate right-hand member; Substrate back be provided with square by 2 × 9 in connect symmetrical T-shaped coupling line unit form in connect symmetrical T-shaped coupling line, connect symmetrical T-shaped unit in square and comprise a Q-RING and two T-shaped coupling lines.
Described substrate is glass-epoxy material, and the length of substrate is 150mm ~ 170mm, and width is 35mm ~ 45mm.Described input transmission line is identical with the shape size exporting transmission line, and length is 8mm ~ 12mm, and width is 2mm ~ 4mm.Described zigzag transmission line is alternately formed by connecting by 18 longitudinal microstrip lines and 17 horizontal microstrip lines, the length of horizontal microstrip line is 3.5mm ~ 4.5mm, and width is 2.5mm ~ 3.5mm, and longitudinal microstrip line is symmetrical, width is 3.5mm ~ 4.5mm, and length is 4mm ~ 12mm.Described 1/4th oval ground plates are one 1/4th ellipse, and its major radius is 45mm ~ 55mm, and short radius is 17mm ~ 19mm.Described square in connect the center that symmetrical T-shaped coupling line is positioned at substrate back, total length is 60mm ~ 80mm, and overall width is 15mm ~ 20mm.Connecing symmetrical T-shaped unit interval in adjacent square in two, described left and right is 1.5mm ~ 2.5mm, upper and lower two adjacent square in connect symmetrical T-shaped unit interval be 4mm ~ 6mm.The total length of described Q-RING is 5mm ~ 7mm, and overall width is 5mm ~ 7mm, and the width of ring is 0.4mm ~ 0.8mm.Described T-shaped coupling line total length is 3mm ~ 5mm, and overall width is 2mm ~ 2.5mm, and live width is 0.4mm ~ 0.8mm.
It is good that the present invention has filtering performance, and structure is simple, and size is little, easy to make, is convenient to the advantages such as integrated.
Accompanying drawing explanation
Fig. 1 is the Facad structure figure of band resistance microstripline filter;
Fig. 2 is the structure figure of band resistance microstripline filter;
Fig. 3 be square in connect the structure chart of symmetrical T-shaped unit;
Fig. 4 is the performance chart of band resistance microstripline filter;
Fig. 5 is the Surface current distribution figure of band resistance microstripline filter when 5.1GHz;
Fig. 6 is the Surface current distribution figure of band resistance microstripline filter when 5.4GHz;
Fig. 7 is the Surface current distribution figure of band resistance microstripline filter when 5.78GHz.
Embodiment
As shown in Figures 1 to 3, band resistance microstripline filter comprise substrate 1, input transmission line 2, zigzag transmission line 3, export transmission line 4,1/4th oval ground plate 5, square in connect symmetrical T-shaped coupling line 6; Substrate 1 front center is laterally provided with zigzag transmission line 3, corner, substrate 1 front is provided with 1/4th oval ground plates 5, zigzag transmission line 3 one end is connected with input transmission line 2 one end, input transmission line 2 other end is connected with substrate 1 left end, zigzag transmission line 3 other end is connected with output transmission line 4 one end, exports transmission line 4 other end and is connected with substrate 1 right-hand member; Substrate 1 back side be provided with square by 2 × 9 in connect symmetrical T-shaped coupling line unit 6 form in connect symmetrical T-shaped coupling line 7, connect symmetrical T-shaped unit 6 in square and comprise a Q-RING 8 and two T-shaped coupling lines 9.
Described substrate 1 is glass-epoxy material, and the length of substrate 1 is 150mm ~ 170mm, and width is 35mm ~ 45mm.Described input transmission line 2 is identical with the shape size exporting transmission line 4, and length is 8mm ~ 12mm, and width is 2mm ~ 4mm.Described zigzag transmission line 3 is alternately formed by connecting by 18 longitudinal microstrip lines and 17 horizontal microstrip lines, the length of horizontal microstrip line is 3.5mm ~ 4.5mm, and width is 2.5mm ~ 3.5mm, and longitudinal microstrip line is symmetrical, width is 3.5mm ~ 4.5mm, and length is 4mm ~ 12mm.Described 1/4th oval ground plates 5 are one 1/4th ellipse, and its major radius is 45mm ~ 55mm, and short radius is 17mm ~ 19mm.Described square in connect the center that symmetrical T-shaped coupling line 6 is positioned at substrate 1 back side, total length is 60mm ~ 80mm, and overall width is 15mm ~ 20mm.Connecing symmetrical T-shaped unit 7 spacing in adjacent square in two, described left and right is 1.5mm ~ 2.5mm, upper and lower two adjacent square in connect symmetrical T-shaped unit 7 spacing be 4mm ~ 6mm.The total length of described Q-RING 8 is 5mm ~ 7mm, and overall width is 5mm ~ 7mm, and the width of ring is 0.4mm ~ 0.8mm.Described T-shaped coupling line 9 total length is 3mm ~ 5mm, and overall width is 2mm ~ 2.5mm, and live width is 0.4mm ~ 0.8mm.
embodiment 1
Band resistance microstripline filter:
Select dielectric constant be 4.4 glass-epoxy material make micro-belt substrate, thickness is 0.5mm.The length of substrate is 160mm, and width is 40mm.Input transmission line is identical with the shape size exporting transmission line, and length is 10mm, and width is 3mm.Zigzag transmission line is alternately formed by connecting by 18 longitudinal microstrip lines and 17 horizontal microstrip lines, the length of horizontal microstrip line is 4mm, width is 3mm, longitudinal microstrip line is symmetrical, width is 4mm, and length is for be followed successively by 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm by two ends to centre./ 4th oval ground plates are one 1/4th ellipse, and its major radius is 50mm, and short radius is 18mm.Connect the center that symmetrical T-shaped coupling line is positioned at substrate back in square, total length is 70mm, and overall width is 19mm.Two, left and right adjacent square in connect symmetrical T-shaped unit interval be 2mm, upper and lower two adjacent square in connect symmetrical T-shaped unit interval be 5mm.The total length of Q-RING is 6mm, and overall width is 6mm, and the width of ring is 0.6mm.T-shaped coupling line total length is 4mm, and overall width is 2.2mm, and live width is 0.6mm.The property indices of band resistance microstripline filter adopts CST software to test, and the performance curve of gained filter as shown in Figure 4.As seen from the figure, 3dB free transmission range is 0GHz ~ 5.1GHz and 5.78GHz ~ 7.0GHz, 3dB stopband range is 5.1GHz ~ 5.78GHz, and insertion loss maximum is-44dB.In these free transmission ranges, insertion loss is little, and return loss is large, and in stopband range, insertion loss is large, and return loss is little, and this illustrates that filter has excellent bandreject filtering performance.Fig. 5, Fig. 6 and Fig. 7 are the Surface current distribution figure of band resistance microstripline filter respectively when 5.1GHz, 5.4GHz and 5.78GHz.
Claims (9)
1. a band resistance microstripline filter, it is characterized in that comprising substrate (1), input transmission line (2), zigzag transmission line (3), export transmission line (4), 1/4th oval ground plates (5), square in connect symmetrical T-shaped coupling line (6); Substrate (1) front center is laterally provided with zigzag transmission line (3), substrate (1) corner, front is provided with 1/4th oval ground plates (5), zigzag transmission line (3) one end is connected with input transmission line (2) one end, input transmission line (2) other end is connected with substrate (1) left end, zigzag transmission line (3) other end is connected with output transmission line (4) one end, exports transmission line (4) other end and is connected with substrate (1) right-hand member; Substrate (1) back side be provided with square by 2 × 9 in connect symmetrical T-shaped coupling line unit (6) form in connect symmetrical T-shaped coupling line (7), connect symmetrical T-shaped unit (6) in square and comprise a Q-RING (8) and two T-shaped coupling lines (9).
2. a kind of band resistance microstripline filter as claimed in claim 1, it is characterized in that described substrate (1) is glass-epoxy material, the length of substrate (1) is 150mm ~ 170mm, and width is 35mm ~ 45mm.
3. a kind of band resistance microstripline filter as claimed in claim 1, it is characterized in that described input transmission line (2) is identical with the shape size exporting transmission line (4), length is 8mm ~ 12mm, and width is 2mm ~ 4mm.
4. a kind of band resistance microstripline filter as claimed in claim 1, it is characterized in that described zigzag transmission line (3) is alternately formed by connecting by 18 longitudinal microstrip lines and 17 horizontal microstrip lines, the length of horizontal microstrip line is 3.5mm ~ 4.5mm, width is 2.5mm ~ 3.5mm, longitudinal microstrip line is symmetrical, width is 3.5mm ~ 4.5mm, and length is 4mm ~ 12mm.
5. a kind of band resistance microstripline filter as claimed in claim 1, it is characterized in that 1/4th described oval ground plates (5) are one 1/4th ellipse, its major radius is 45mm ~ 55mm, and short radius is 17mm ~ 19mm.
6. band resistance microstripline filter as claimed in claim 1 a kind of, it is characterized in that described square in connect the center that symmetrical T-shaped coupling line (7) is positioned at substrate (1) back side, total length is 60mm ~ 80mm, and overall width is 15mm ~ 20mm.
7. a kind of band resistance microstripline filter as claimed in claim 1, it is characterized in that connecing symmetrical T-shaped unit (6) spacing in adjacent square in two, described left and right is 1.5mm ~ 2.5mm, upper and lower two adjacent square in connect symmetrical T-shaped unit (6) spacing be 4mm ~ 6mm.
8. a kind of band resistance microstripline filter as claimed in claim 1, it is characterized in that the total length of described Q-RING (8) is 5mm ~ 7mm, overall width is 5mm ~ 7mm, and the width of ring is 0.4mm ~ 0.8mm.
9. a kind of band resistance microstripline filter as claimed in claim 1, it is characterized in that described T-shaped coupling line (9) total length is 3mm ~ 5mm, overall width is 2mm ~ 2.5mm, and live width is 0.4mm ~ 0.8mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410599269.6A CN104282969A (en) | 2014-10-31 | 2014-10-31 | Band-stop microstrip line filter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410599269.6A CN104282969A (en) | 2014-10-31 | 2014-10-31 | Band-stop microstrip line filter |
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| CN104282969A true CN104282969A (en) | 2015-01-14 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105006622A (en) * | 2015-07-21 | 2015-10-28 | 成都中微电微波技术有限公司 | Microwave power divider |
| CN105070999A (en) * | 2015-07-21 | 2015-11-18 | 成都中微电微波技术有限公司 | Microwave broadband power divider |
| CN105720341A (en) * | 2016-03-09 | 2016-06-29 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | Energy-load coupling T-shaped ring band-pass filter for S wave band |
Citations (2)
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| US20130301983A1 (en) * | 2012-05-08 | 2013-11-14 | Pinaki Mazumder | Dynamic Terahertz Switching Device Comprising Sub-wavelength Corrugated Waveguides and Cavity that Utilizes Resonance and Absorption for Attaining On and Off states |
| CN203553320U (en) * | 2013-10-25 | 2014-04-16 | 东南大学 | Efficient surface plasma element transmission line |
-
2014
- 2014-10-31 CN CN201410599269.6A patent/CN104282969A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130301983A1 (en) * | 2012-05-08 | 2013-11-14 | Pinaki Mazumder | Dynamic Terahertz Switching Device Comprising Sub-wavelength Corrugated Waveguides and Cavity that Utilizes Resonance and Absorption for Attaining On and Off states |
| CN203553320U (en) * | 2013-10-25 | 2014-04-16 | 东南大学 | Efficient surface plasma element transmission line |
Non-Patent Citations (1)
| Title |
|---|
| BAI CAO PAN等: "Controlling rejections of spoof surface plasmon polaritons using metamaterial particles", 《OPTICS EXPRESS》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105006622A (en) * | 2015-07-21 | 2015-10-28 | 成都中微电微波技术有限公司 | Microwave power divider |
| CN105070999A (en) * | 2015-07-21 | 2015-11-18 | 成都中微电微波技术有限公司 | Microwave broadband power divider |
| CN105720341A (en) * | 2016-03-09 | 2016-06-29 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | Energy-load coupling T-shaped ring band-pass filter for S wave band |
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