CN203039051U - Microstrip low-pass filter - Google Patents
Microstrip low-pass filter Download PDFInfo
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- CN203039051U CN203039051U CN 201320002596 CN201320002596U CN203039051U CN 203039051 U CN203039051 U CN 203039051U CN 201320002596 CN201320002596 CN 201320002596 CN 201320002596 U CN201320002596 U CN 201320002596U CN 203039051 U CN203039051 U CN 203039051U
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- microstrip
- pass filter
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Abstract
The utility model relates to a microstrip low-pass filter for microwave transmission. Aiming at the defect that the low-pass filter in the prior art is poor in attenuation characteristics, the utility model discloses a microstrip low-pass filter for improving the attenuation characteristics of the low-pass filter. The technical scheme is that the microstrip low-pass filter comprises a substrate, a ground plane and a microstrip transmission line, wherein the ground plane and the microstrip transmission line are respectively distributed on the back surface and the front surface of the substrate; capacitor microstrips are connected onto the microstrip transmission line; and inductor microstrips are connected between the capacitor microstrips and the microstrip transmission line. According to the microstrip low-pass filter, in the condition that the size of the filter is not changed, attenuation amplitude of stopband signals can be improved, and performances of the filter are greatly improved; or in the condition that the same stopband attenuation is met, the order of the filter can be reduced, the size of the filter is then reduced, and circuit microminiaturization can be realized.
Description
Technical field
The utility model relates to the microwave transmission technology, particularly for the microstrip line low pass filter of microwave transmission.
Background technology
The microstrip line system is a kind of common microwave transmission system, and its structure comprises the signals layer 11 of top layer, intermediate layer medium substrate 10 and bottom ground plane 12, as shown in Figure 1.Signals layer 11 and ground plane 12 are made of metal material usually, can be metal forming or washing layer, and signals layer is also referred to as microstrip line.According to different circuit functions, the microstrip line shape is had nothing in common with each other, and modal is rectangular strip (being also referred to as the rectangular strip microstrip line), as various transmission lines, open-circuit line, short-circuit line, λ/4 open-circuit lines, λ/2 short-circuit lines etc.These microstrip lines can constitute microwave components such as resonator, coupler, filter.Because the physical dimension difference of microstrip line, its distributed constant is different.In specific application scenario, thinner rectangular strip microstrip line mainly presents inductance characteristic, is called the inductance microstrip line; Wideer rectangular strip microstrip line mainly presents capacitance characteristic, is called the electric capacity microstrip line.Utilize this distributed constant characteristic of microstrip line, can constitute various filters, seven rank low pass filters shown in Figure 2 are exactly a kind of application filter very widely, and its structure comprises among substrate 10, ground plane 12(Fig. 2 invisible), microstrip transmission line 112 and electric capacity microstrip line 111.Ground plane 12 is distributed in substrate 10 back sides, and microstrip transmission line 112 and electric capacity microstrip line 111 are distributed in substrate 10 fronts, electric capacity microstrip line 111 and 112 vertical connections of microstrip transmission line.This seven rank low pass filters, microstrip transmission line 112 main distributed constants are inductance, so also can regard the inductance microstrip line as.Microstrip transmission line 112 is divided into three sections among Fig. 2, and each section can equivalence be an inductance, and the equivalent circuit diagram of this seven rank low pass filter as shown in Figure 3.By Fig. 2 and Fig. 3 as seen, because the symmetry that microstrip line distributes, circuit diagram also has symmetry, and the electric capacity at two ends is C1, and middle electric capacity is C2, and 2 inductance at two ends are L1, and 2 middle inductance are L2, and Fig. 4 has provided the transfer curve of this filter.Because the characteristic of inductance can be passed through decay when frequency is high when to be signal frequency low; The characteristic of electric capacity is just opposite, so the circuit of being made up of LC (Fig. 3) has the characteristic of low pass, has formed low pass filter.The shortcoming of prior art low pass filter mainly is that the filter stop bend decay is big inadequately, often can not meet design requirement, if will increase stopband attenuation generally has only the increase filter order, filter volume and cost are increased, can make the useful signal decay become big simultaneously again.
The utility model content
Technical problem to be solved in the utility model is exactly at the bad shortcoming of prior art low pass filter attenuation characteristic, and a kind of microstrip line low pass filter is provided, and improves the low pass filter attenuation characteristic.
The utility model solves the problems of the technologies described above, the technical scheme that adopts is, the microstrip line low pass filter, comprise substrate, ground plane and microstrip transmission line, described ground plane and microstrip transmission line are distributed in substrate back and front respectively, be connected with the electric capacity microstrip line on the described microstrip transmission line, it is characterized in that, be connected with the inductance microstrip line between described electric capacity microstrip line and the microstrip transmission line.
Further, described inductance microstrip line is vertical with microstrip transmission line.
Further, described electric capacity microstrip line is distributed in the microstrip transmission line both sides.
Preferred, described electric capacity microstrip line is symmetrically distributed in the microstrip transmission line both sides.
The beneficial effects of the utility model are, can improve stopband signal attenuation amplitude under the situation that does not change filter size, greatly improve the performance of filter; Perhaps under the situation that satisfies same stopband attenuation, can reduce the exponent number of filter, thereby reduce the size of filter, realize the circuit microminiaturization.
Description of drawings
Fig. 1 is microstrip line system configuration schematic diagram;
Fig. 2 is prior art microstrip line low pass filter structural representation;
Fig. 3 is filter equivalent circuit diagram shown in Figure 2
Fig. 4 is filter transfer curve shown in Figure 2;
Fig. 5 is the microstrip line low pass filter structural representation of embodiment 1;
Fig. 6 is the filter equivalent circuit diagram of embodiment 1;
Fig. 7 is the filter transfer curve of embodiment 1;
Fig. 8 is the microstrip line low pass filter structural representation of embodiment 2.
Among the figure: in is input; Out is output; 10 is substrate; 11 is signals layer; 12 is ground plane; 110 is the inductance microstrip line; 111 is the electric capacity microstrip line; 112 is microstrip transmission line; C1, C2 are electric capacity; L1, L2, L3, L4 are inductance.
Embodiment
Below in conjunction with drawings and Examples, describe the technical solution of the utility model in detail.
Microstrip line low pass filter of the present utility model, between prior art filter capacity microstrip line and microstrip transmission line, increased the inductance microstrip line, utilize electric capacity and inductance resonance, make the stopband attenuation of low pass filter become precipitous, performance of filter obtains very big improvement.
Embodiment 1
This routine microstrip line low pass filter also is a kind of seven rank filters, and its microstrip line system configuration comprises among substrate 10, ground plane 12(Fig. 5 invisible as shown in Figure 5), microstrip transmission line 112, electric capacity microstrip line 111 and inductance microstrip line 110.Ground plane 12 is distributed in substrate back, microstrip transmission line 112, and electric capacity microstrip line 111 and inductance microstrip line 110 are positioned at pole plate 10 fronts, and Fig. 5 is its vertical view.Be connected with inductance microstrip line 110 between this routine electric capacity microstrip line 111 and the microstrip transmission line 112, inductance microstrip line 110 is vertical with microstrip transmission line 112.This routine microstrip line low pass filter, have symmetrical structure, its equivalent circuit diagram as shown in Figure 6, except 4 inductance (2 inductance L 1 and 2 inductance L 2) that microstrip transmission line 112 constitutes, 2 capacitor C 1 at two ends are connected with inductance L 3 respectively, and middle capacitor C 2 is connected with inductance L 4.By transfer curve shown in Figure 7 as can be seen, be the band pass filter of 1GHz for the design cut-off frequency, when frequency was higher than 1.2GHz, its decay was just greater than 40dB.And have the prior art filter of identical exponent number, and transfer curve as shown in Figure 4, frequency is higher than more than the 1.8GHz, and its decay just begins greater than 40dB, and this routine low pass filter performance obviously is better than the prior art filter.
Embodiment 2
This routine filter construction as shown in Figure 8, its maximum characteristics are that electric capacity microstrip line 111 is symmetrically distributed in microstrip transmission line 112 both sides.Same, also be connected with inductance microstrip line 110 between this routine electric capacity microstrip line 111 and the microstrip transmission line 112.Other structures of this example are referring to the description of embodiment 1.This routine filter can constitute the filter of higher exponent number under the situation that does not increase substrate length, be conducive to reduce signal attenuation and product cost.
Claims (4)
1. microstrip line low pass filter, comprise substrate, ground plane and microstrip transmission line, described ground plane and microstrip transmission line are distributed in substrate back and front respectively, be connected with the electric capacity microstrip line on the described microstrip transmission line, it is characterized in that, be connected with the inductance microstrip line between described electric capacity microstrip line and the microstrip transmission line.
2. microstrip line low pass filter according to claim 1 is characterized in that, described inductance microstrip line is vertical with microstrip transmission line.
3. microstrip line low pass filter according to claim 1 and 2 is characterized in that, described electric capacity microstrip line is distributed in the microstrip transmission line both sides.
4. microstrip line low pass filter according to claim 3 is characterized in that, described electric capacity microstrip line is symmetrically distributed in the microstrip transmission line both sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320002596 CN203039051U (en) | 2013-01-04 | 2013-01-04 | Microstrip low-pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320002596 CN203039051U (en) | 2013-01-04 | 2013-01-04 | Microstrip low-pass filter |
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| Publication Number | Publication Date |
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| CN203039051U true CN203039051U (en) | 2013-07-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320002596 Expired - Fee Related CN203039051U (en) | 2013-01-04 | 2013-01-04 | Microstrip low-pass filter |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015074277A1 (en) * | 2013-11-25 | 2015-05-28 | 海能达通信股份有限公司 | Power device and micro-strip filter thereof |
| CN103606725B (en) * | 2013-11-25 | 2015-08-05 | 中国电子科技集团公司第四十一研究所 | A kind of open circuit stepped impedance low pass filter in parallel |
| CN105720940A (en) * | 2016-01-26 | 2016-06-29 | 中国振华集团云科电子有限公司 | Miniaturized low pass filter loaded with chip capacitors |
| CN106876845A (en) * | 2015-12-13 | 2017-06-20 | 哈尔滨飞羽科技有限公司 | The three trap bandpass filters based on step electric impedance resonator and open circuit minor matters |
| CN107425238A (en) * | 2017-09-07 | 2017-12-01 | 广东工业大学 | A kind of lc circuit structure |
| CN109742495A (en) * | 2018-12-29 | 2019-05-10 | 上海微波技术研究所（中国电子科技集团公司第五十研究所） | A kind of Wide stop bands low-pass filter that compact height roll-offs |
| CN109803485A (en) * | 2019-01-11 | 2019-05-24 | 张家港保税区灿勤科技有限公司 | Low pass circuit, printed circuit board and dielectric waveguide filter that distal end inhibits can be improved |
| CN110165399A (en) * | 2019-05-29 | 2019-08-23 | 中天宽带技术有限公司 | The dual-band antenna and electronic equipment of single port feed |
| CN113013562A (en) * | 2019-12-18 | 2021-06-22 | 深圳市大富科技股份有限公司 | Communication equipment and adjustable microstrip filter |
-
2013
- 2013-01-04 CN CN 201320002596 patent/CN203039051U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015074277A1 (en) * | 2013-11-25 | 2015-05-28 | 海能达通信股份有限公司 | Power device and micro-strip filter thereof |
| CN103606725B (en) * | 2013-11-25 | 2015-08-05 | 中国电子科技集团公司第四十一研究所 | A kind of open circuit stepped impedance low pass filter in parallel |
| CN106876845A (en) * | 2015-12-13 | 2017-06-20 | 哈尔滨飞羽科技有限公司 | The three trap bandpass filters based on step electric impedance resonator and open circuit minor matters |
| CN105720940A (en) * | 2016-01-26 | 2016-06-29 | 中国振华集团云科电子有限公司 | Miniaturized low pass filter loaded with chip capacitors |
| CN107425238A (en) * | 2017-09-07 | 2017-12-01 | 广东工业大学 | A kind of lc circuit structure |
| CN109742495A (en) * | 2018-12-29 | 2019-05-10 | 上海微波技术研究所（中国电子科技集团公司第五十研究所） | A kind of Wide stop bands low-pass filter that compact height roll-offs |
| CN109803485A (en) * | 2019-01-11 | 2019-05-24 | 张家港保税区灿勤科技有限公司 | Low pass circuit, printed circuit board and dielectric waveguide filter that distal end inhibits can be improved |
| CN110165399A (en) * | 2019-05-29 | 2019-08-23 | 中天宽带技术有限公司 | The dual-band antenna and electronic equipment of single port feed |
| CN110165399B (en) * | 2019-05-29 | 2021-07-23 | 中天宽带技术有限公司 | Single-port-fed dual-frequency antenna and electronic equipment |
| CN113013562A (en) * | 2019-12-18 | 2021-06-22 | 深圳市大富科技股份有限公司 | Communication equipment and adjustable microstrip filter |
| CN113013562B (en) * | 2019-12-18 | 2022-05-03 | 深圳市大富科技股份有限公司 | Communication equipment and adjustable microstrip filter |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130703 Termination date: 20140104 |