CN103219570B - Ultra wide band coplanar waveguide filter adopting terminal short circuit H-type resonator - Google Patents
Ultra wide band coplanar waveguide filter adopting terminal short circuit H-type resonator Download PDFInfo
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- CN103219570B CN103219570B CN201310118448.9A CN201310118448A CN103219570B CN 103219570 B CN103219570 B CN 103219570B CN 201310118448 A CN201310118448 A CN 201310118448A CN 103219570 B CN103219570 B CN 103219570B
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Abstract
The invention discloses an ultra wide band coplanar waveguide filter adopting a terminal short circuit H-type resonator. The ultra wide band coplanar waveguide filter comprises a coplanar waveguide structure and an H-type micro-strip line resonator, wherein the coplanar waveguide structure is coupled with the H-type micro-strip line resonator, the left and right ends of the coplanar waveguide structure are respectively connected with a wedged transmission line, multiple L-shaped slot lines are arranged on the coplanar waveguide structure, an E-shaped slot is arranged in the center of the coplanar waveguide structure, and the H-type micro-strip line resonator is connected with an E-shaped slot line adaptive to the E-shaped slot. The ultra wide band coplanar waveguide filter adopts two structures, namely the terminal short circuit H-type resonator and the coplanar waveguide, can realize strong coupling, additionally adopts the wedged transmission lines to improve the in-band feature and also additionally adopts the L-shaped slot lines to improve the out-band feature of a high frequency band, and further, a trapped wave can be generated in band, and the influence of a wireless local area network system on an ultra wide band system is eliminated.
Description
Technical field
The present invention relates to a kind of ultra wide band coplanar waveguide filter, especially a kind of ultra wide band coplanar waveguide filter adopting the H type resonator of terminal short circuit, belongs to wireless communication field.
Background technology
Along with the development of Wireless Broadband Communication Systems, the especially development of Ultra-wideband Communication Technology, gets more and more to the demand of ultra-wide band filter, and the performance of filter also receives and payes attention to widely simultaneously.Past most of band pass filter, comprise ultra-wide band filter, general is all realize with microstrip line construction, but it is not very strong that microstripline filter has a bottleneck to be coupling between coupling line, this be due to transmission line between interval can not be too little, because too little, physics realization is just difficult to, and the return loss which results in band is not very desirable.Because co-planar waveguide can realize very strong coupling, be applied to Design of Bandpass more and more widely, this close coupling can improve the band internal characteristic of filter greatly, comprises low insertion loss and very little group delay.But co-planar waveguide also has a shortcoming, be exactly that band external characteristic is bad, particularly the decay of high band is fast not.
According to investigations with understanding, disclosed prior art is as follows:
2006, H.L.Hu, the people such as X.D.Huang deliver in the article being entitled as " Ultra-wideband bandpass filter using CPW-to-microstrip coupling structure " at " ELECTRONICS LETTERS ", adopt two microstrip line-co-planar waveguide transition structures, and by a microstrip transmission lines as multimode resonator, this filter has well characteristic inside and outside band, and this structure as shown in Figure 1.
2007, the people such as Nan-Wei Chen deliver in the article being entitled as " An Ultra-Broadband Coplanar-WaveguideBandpass Filter With Sharp Skirt Selectivity " at " IEEE MICROWAVE AND WIRELESSCOMPONENTS LETTERS ", co-planar waveguide lowpass and band-pass filter is cascaded up, a ultra-wide band filter can be realized, there is the outer frequency selectivity of sharp-pointed band, and do not have parasitic passband, this structure is illustrated in fig. 2 shown below.
But the filter of above-mentioned two kinds of prior aries just adopts fixing structure, and its function singleness, complex structure, cost is higher, and can not realize trap function, can not meet the actual demand of people.
Summary of the invention
The object of the invention is the defect in order to solve above-mentioned prior art, provide a kind of volume little, cost is low, can improve in band and band external characteristic, and achieve the ultra wide band coplanar waveguide filter of the H type resonator of the employing terminal short circuit of trap function.
Object of the present invention can reach by taking following technical scheme:
A kind of ultra wide band coplanar waveguide filter adopting the H type resonator of terminal short circuit, it is characterized in that: comprise coplanar waveguide structure and H type mini strip line resonator, be coupled between described coplanar waveguide structure and H type mini strip line resonator, and the left and right both sides of described coplanar waveguide structure and H type mini strip line resonator are all symmetrical about same central vertical line; The left and right two ends of described coplanar waveguide structure are connected to wedge shape transmission line.
As a kind of preferred version, the wedge shape transmission line at the left and right two ends of described coplanar waveguide structure respectively has 2.
As a kind of preferred version, described coplanar waveguide structure is provided with many L-type line of rabbet joint.
As a kind of preferred version, the described L-type line of rabbet joint has 8, is respectively provided with 4 on the left and right both sides of described coplanar waveguide structure, and the L-type line of rabbet joint on the described left side and the right is symmetrical.
As a kind of preferred version, the center of described coplanar waveguide structure is provided with an E type groove, and H type mini strip line resonator is provided with the E type line of rabbet joint adapted with E type groove.
The present invention has following beneficial effect relative to prior art:
1, the defect that the ultra wide band coplanar waveguide filter of the present invention coupling band external characteristic that is strong not and co-planar waveguide that solves traditional microstripline filter is bad, have employed H type resonator and co-planar waveguide two kinds of structures of terminal short circuit, very strong coupling can be realized, increase wedge shape transmission line simultaneously and improve band internal characteristic, and increase the L-type line of rabbet joint to improve the band external characteristic of high band.
2, ultra wide band coplanar waveguide filter of the present invention have employed planar structure, there is structure simple, volume is little, the advantage that cost is low, coplanar waveguide structure is provided with E type groove, and the E type line of rabbet joint is connected on H type mini strip line resonator, laterally zygomorphic E type groove and the E type line of rabbet joint can produce a trap in being with, and eliminate the impact of wireless local area network (WLAN) system on radio ultra wide band system.
Accompanying drawing explanation
Fig. 1 is the structural representation of the first prior art.
Fig. 2 is the structural representation of the second prior art.
Fig. 3 is the structural representation of the embodiment of the present invention 1 ultra wide band coplanar waveguide filter.
Fig. 4 is the equivalent circuit diagram of the H type mini strip line resonator of the embodiment of the present invention 1 ultra wide band coplanar waveguide filter.
Fig. 5 is the strange mould analysis circuit figure of the equivalent electric circuit of the H type mini strip line resonator of the embodiment of the present invention 1 ultra wide band coplanar waveguide filter.
Fig. 6 is the even mould analysis circuit figure of the equivalent electric circuit of the H type mini strip line resonator of the embodiment of the present invention 1 ultra wide band coplanar waveguide filter.
Fig. 7 is the stepped impedance normalization resonance frequency figure of the H type mini strip line resonator of the embodiment of the present invention 1 ultra wide band coplanar waveguide filter.
Fig. 8 is the simulation result figure of the embodiment of the present invention 1 ultra wide band coplanar waveguide filter.
Fig. 9 is the structural representation of the embodiment of the present invention 2 ultra wide band coplanar waveguide filter.
Figure 10 is the simulation result figure of the embodiment of the present invention 1 and embodiment 2 ultra wide band coplanar waveguide filter.
Figure 11 is the structural representation of the embodiment of the present invention 3 ultra wide band coplanar waveguide filter.
Figure 12 is the coplanar waveguide structure schematic diagram of the embodiment of the present invention 3 ultra wide band coplanar waveguide filter.
Figure 13 is the simulation result figure of the embodiment of the present invention 3 ultra wide band coplanar waveguide filter.
Figure 14 is the final simulation result figure after ultra wide band coplanar waveguide filter of the present invention adjustment parameter.
Embodiment
Embodiment 1:
As shown in Figure 3, the ultra wide band coplanar waveguide filter of the present embodiment, comprise coplanar waveguide structure 1 and H type mini strip line resonator 2, be coupled between described coplanar waveguide structure 1 and H type mini strip line resonator 2, and the left and right both sides of described coplanar waveguide structure 1 and H type mini strip line resonator 2 are all symmetrical about same central vertical line, the left and right two ends of described coplanar waveguide structure 1 are connected to 2 wedge shape transmission lines 3.
As shown in Figure 4, be the equivalent electric circuit of H type mini strip line resonator, comprise the high-impedance transmission line that middle low impedance transmission line is identical with four, both sides.The high-impedance transmission line on both sides can regard the short branch of a pair parallel connection separately as.A-A ' is the plane of symmetry of this structure, if high impedance value is Z
1, low impedance value is Z
2, and
wherein R is impedance ratio, θ
1and θ
2be respectively corresponding electrical length.
As shown in Figure 5 and Figure 6, the equivalent electric circuit of H type mini strip line resonator is after strange mould analysis and even mould are analyzed, and during strange mould, A-A ' face is electric wall, i.e. short circuit; During even mould, A-A ' face is magnetic wall, namely opens a way; Work as θ
2=2* θ
1, and during R=0.35, three resonant frequency points of this equivalent circuit structure only have first Frequency point in the passband (3.1GHz to 10.6GHz) of ultra-wide band filter, as shown in Figure 7.
The ultra wide band coplanar waveguide filter of the present embodiment can produce five modes of resonance, as shown in Figure 8, can find out that these five modes of resonance can form a ultra broadband (3.1GHz to 10.6GHz), but also can find out that high frequency band external characteristic is poor, particularly near 16GHz | S21| value is greater than-5dB, has considerable influence to the performance of whole filter.
Embodiment 2:
As shown in Figure 9, the ultra wide band coplanar waveguide filter main feature of the present embodiment is: described coplanar waveguide structure 1 is provided with 8 L-type line of rabbet joint 4, and left and right both sides are respectively provided with 4, and the L-type line of rabbet joint 4 on the described left side and the right is symmetrical.All the other are with embodiment 1.
The L-type line of rabbet joint of the ultra wide band coplanar waveguide filter of the present embodiment, is equivalent to add low pass filter, as shown in Figure 10, can find out, the filter before not increasing compared by the filter increased after the L-type line of rabbet joint, and high frequency band external characteristic obtains to be improved well.
Embodiment 3:
As is illustrated by figs. 11 and 12, the ultra wide band coplanar waveguide filter main feature of the present embodiment is: the center of described coplanar waveguide structure 1 is provided with an E type groove 5, and H type mini strip line resonator 2 is provided with the E type line of rabbet joint 6 adapted with E type groove 5.All the other are with embodiment 2.
The E type line of rabbet joint of the ultra wide band coplanar waveguide filter of the present embodiment is to realize trap function, as shown in figure 13, find out that this structure can produce the trap that has two transmission zeros, its centre frequency is 5.8GHz, so just can avoid the impact of wireless local area network (WLAN) system on radio ultra wide band system well.
As shown in figure 14, ultra wide band coplanar waveguide filter of the present invention has well is with internal characteristic, and simultaneously Out-of-band rejection is better, and in passband, have a centre frequency to be the trap of 5.8GHz.
The above; be only the preferred embodiment of the invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in scope disclosed in this invention; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all belonged to protection scope of the present invention.
Claims (4)
1. one kind adopts the ultra wide band coplanar waveguide filter of the H type resonator of terminal short circuit, it is characterized in that: comprise coplanar waveguide structure (1) and H type mini strip line resonator (2), be coupled between described coplanar waveguide structure (1) and H type mini strip line resonator (2), and the left and right both sides of described coplanar waveguide structure (1) and H type mini strip line resonator (2) are all symmetrical about same central vertical line; The left and right two ends of described coplanar waveguide structure (1) are connected to wedge shape transmission line (3); Described coplanar waveguide structure (1) is provided with the many L-type line of rabbet joint (4).
2. a kind of ultra wide band coplanar waveguide filter adopting the H type resonator of terminal short circuit according to claim 1, is characterized in that: the wedge shape transmission line (3) at described coplanar waveguide structure (1) left and right two ends respectively has 2.
3. a kind of ultra wide band coplanar waveguide filter adopting the H type resonator of terminal short circuit according to claim 1, it is characterized in that: the described L-type line of rabbet joint (4) has 8, respectively be provided with 4 on the left and right both sides of described coplanar waveguide structure (1), the L-type line of rabbet joint (4) on the described left side and the right is symmetrical.
4. a kind of ultra wide band coplanar waveguide filter adopting the H type resonator of terminal short circuit according to any one of claim 1-3, it is characterized in that: the center of described coplanar waveguide structure (1) is provided with an E type groove (5), and H type mini strip line resonator (2) is provided with the E type line of rabbet joint (6) adapted with E type groove (5).
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| CN103219570B true CN103219570B (en) | 2015-07-01 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103700919B (en) * | 2014-01-18 | 2016-09-28 | 成都顺为超导科技股份有限公司 | Resonator, resonator are for wave filter, wave filter and resonator design method |
| EP3346543B1 (en) | 2016-05-12 | 2020-11-25 | Huawei Technologies Co., Ltd. | Filtering unit and filter |
| CN107086339B (en) * | 2017-04-17 | 2019-04-05 | 电子科技大学 | A kind of ultra-wide band filter based on novel defected microstrip structure |
| CN110350286A (en) * | 2019-06-03 | 2019-10-18 | 四川贝嘉薪科技有限公司 | Four mould resonators of one kind and millimeter wave double-passband filter |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203218417U (en) * | 2013-04-07 | 2013-09-25 | 华南理工大学 | Ultra-wide-band coplanar waveguide filter employing H-type resonator with terminal short circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203218417U (en) * | 2013-04-07 | 2013-09-25 | 华南理工大学 | Ultra-wide-band coplanar waveguide filter employing H-type resonator with terminal short circuit |
Non-Patent Citations (3)
| Title |
|---|
| An Ultra-Broadband Coplanar-Waveguide Bandpass Filter With Sharp Skirt Selectivity;Nan-Wei Chen et al;《IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS》;20070228;第17卷(第2期);第124-126页，附图5，6 * |
| Short-Circuited CPW Multiple-Mode Resonator for Ultra-Wideband (UWB) Bandpass Filter;Jing Gao et al;《IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS》;20060331;第16卷(第3期);全文 * |
| Ultra-wideband bandpass filter using CPW-to-microstrip coupling structure;H.L. Hu et al;《ELECTRONICS LETTERS》;20060511;第42卷(第10期);全文 * |
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