CN101916893A - Double frequency band-pass filter based on double branch line loading stepped -impedance resonator - Google Patents
Double frequency band-pass filter based on double branch line loading stepped -impedance resonator Download PDFInfo
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- CN101916893A CN101916893A CN2010102523937A CN201010252393A CN101916893A CN 101916893 A CN101916893 A CN 101916893A CN 2010102523937 A CN2010102523937 A CN 2010102523937A CN 201010252393 A CN201010252393 A CN 201010252393A CN 101916893 A CN101916893 A CN 101916893A
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Abstract
The invention discloses a double frequency band-pass filter based on a double branch line loading stepped impedance resonator, relating to a double frequency band-pass filter based on a double branch line loading stepped impedance resonator, which can be used for wireless local area networks, wherein a first open-loop stepped impedance resonator (3) and a second open-loop stepped impedance resonator (4) are symmetrically arranged side by side; the open-loop openings are arranged in opposite direction; a first loading double branch line (5) is arranged at the opposite side of the opening in the first open-loop stepped impedance resonator (3); a second loading double branch line (6) is arranged at the opposite side of the opening in the second open-loop stepped impedance resonator (4); the first input and output end (1) is connected with the first open-loop stepped impedance resonator (3); the second input and output end (2) is connected with the second open-loop stepped impedance resonator (4); the upper sides and the lower sides of the first open-loop stepped impedance resonator (3) and the second open-loop stepped impedance resonator (4) are respectively provided with a first parallel coupling microstrip line (7) and a second parallel coupling microstrip line (8).
Description
Technical field
The present invention relates to a kind of microwave double frequency band-pass filter, relate in particular to a kind of double frequency band-pass filter that WLAN (wireless local area network) is used that can be used for based on double branch line loading stepped-impedance resonator.
Background technology
In recent years, develop rapidly along with various Modern wireless communication application, the wireless lan (wlan) system that particularly grows up recent years, the demand of using multiband equipment in microwave telecommunication system is also in rapid increase, and the two-band filter that becomes these communication system front end important devices is one of them.Wireless lan (wlan) has several different communication standards, and as IEEE 802.11b, IEEE 802.11g is operated in 2.4 or the 2.45GHz frequency range respectively, and IEEE 802.11a then is operated in the 5.2-5.8GHz frequency range.Because wlan system is supported at least 2 standards mostly simultaneously in actual applications, for example IEEE 802.11b and IEEE 802.11a, this just requires system to possess the operating function of double frequency-band. traditional dual frequency filter, as band pass filter of cascade and band stop filter realizing a double frequency band-pass filter, but the volume that occupies is very big; Or resonator is embedded in the open circuit ring wave filter of another one half-wavelength and removes to obtain two passbands, but bandwidth is relatively narrow.Therefore, need to propose novel dual frequency filter, be necessary to make filter size little, simple in structure, broader bandwidth is to cover whole WLAN frequency range, to realize high-performance, low-loss, target cheaply.
Summary of the invention
Technical problem: the present invention adopts planar microstrip structure, design the double frequency band-pass filter based on double branch line loading stepped-impedance resonator that can cover whole WLAN frequency range, in its frequency range, realized lower insertion loss, further reduce the volume of filter, helped the integrated design of circuit.
Technical scheme: the double frequency band-pass filter based on double branch line loading stepped-impedance resonator of the present invention is arranged on the substrate, comprise first input/output terminal, second input/output terminal, the first open loop step electric impedance resonator, the second open loop step electric impedance resonator, first loads double branch line, second loads double branch line, first Coupled Miccrostrip Lines, second Coupled Miccrostrip Lines; Wherein, the first open loop step electric impedance resonator, the second open loop step electric impedance resonator are symmetrical arranged side by side, the opening of its open loop is provided with in opposite directions, be provided with first on the opposite of the first open loop step electric impedance resonator inner opening and load double branch line, be provided with second on the opposite of the second open loop step electric impedance resonator inner opening and load double branch line; First input/output terminal is connected with the first open loop step electric impedance resonator, and second input/output terminal is connected with the second open loop step electric impedance resonator; Both sides up and down at the first open loop step electric impedance resonator, the second open loop step electric impedance resonator are respectively equipped with first Coupled Miccrostrip Lines, second Coupled Miccrostrip Lines.
Described first input/output terminal, second input/output terminal are respectively 50 ohm of matched impedances of described double frequency filter.The first open loop step electric impedance resonator, the second open loop step electric impedance resonator opening adopt second slit to come interior coupling, adopt first slit to come interstage coupling between two open loop step electric impedance resonators.
First Coupled Miccrostrip Lines, second Coupled Miccrostrip Lines and the first open loop step electric impedance resonator, the second open loop step electric impedance resonator are at a distance of the 3rd slit.
The first open loop step electric impedance resonator, the second open loop step electric impedance resonator are narrower than the live width on all the other each limits in the live width that connects first input/output terminal, second input/output terminal, one side part.
Double frequency band-pass filter based on double branch line loading stepped-impedance resonator of the present invention, by increasing double branch line in resonant cavity, yet even mould resonance frequency can be controlled its strange mould resonance frequency flexibly and remains unchanged and make second passband more smooth.By increasing by two Coupled Miccrostrip Lines, the coupling between two resonant cavitys has obtained strengthening to obtain more bandwidth in second passband.Finally, can obtain comprising the double band bandpass filter of two frequency band 2.45GHz and 5.35GHz by optimal design and processing.
As seen from Figure 1, this double frequency-band band comprises two coupling open loop stepped impedance resonant cavitys with filter, two open stub are arranged in the inside of two resonant cavitys and at resonant cavity a parallel with it coupled microstrip line is arranged respectively up and down.Fundamental frequency is relevant with the length overall of resonant cavity, and we can be fixed after having obtained first resonance frequency, and second resonance frequency can be regulated with the length of size and two parallel coupled lines by the relative distance of regulating two stubs.The main effect of two Coupled Miccrostrip Lines is to reach the bandwidth that increases by second passband by the coupling coefficient that increases between the two open loop stepped impedance resonant cavitys.Because second passband is not the twice of first passband, therefore compares with single branch line loading and adopt step electric impedance resonator and double branch line loading will have more variable and more flexible with traditional uniform impedance resonator.Design process can be divided into two parts: the first step is that the live width and the length of decision resonant cavity makes it reach good performance in first passband; Second step was that the relative size of regulating two stubs and parallel coupled line makes in second frequency range good transmission is arranged.
By top analysis, we obtain promptly having obtained double frequency-band and broadband properties by loading double branch line, coupled microstrip line and stepped impedance mechanism on the basis that does not increase original resonator dimensions.By relatively our discoveries of analogous diagram and the resolution chart goodness of fit between the two is satisfied.
Beneficial effect: adopt the dual frequency filter of open-loop resonator to compare with tradition, the present invention has the following advantages:
1) based on the double frequency band-pass filter of double branch line loading stepped-impedance resonator, compact conformation, favorable repeatability is easy to processing.
2) it is little to insert loss, in the loss of height frequency range substantially about 1dB.
3) broader bandwidth.Surveying second frequency band is 4.9GHz-5.8GHz, has covered the whole frequency of WLAN at high band substantially.
4) simple in structure.Adopt two open loop step electric impedance resonators, inside has double branch line to load, and there are two parallel coupling and microstrip lines the outside, for the planar microstrip line structure is very easily realized.
Description of drawings
Fig. 1 is the structural representation of double frequency band-pass filter of the present invention.
Fig. 2 is all-wave emulation S parameter of the present invention and test S parameter comparative graph.
Embodiment
See also Fig. 1, be depicted as the structural representation of the double frequency band-pass filter 10 based on double branch line loading stepped-impedance resonator of the present invention.
In the present embodiment, double band bandpass filter 10 is arranged on the substrate 20, double band bandpass filter 10 comprises first input/output terminal 1, second input/output terminal 2, the first open loop step electric impedance resonator 3, the second open loop step electric impedance resonator 4, first loads double branch line 5, second loads double branch line 6, the first Coupled Miccrostrip Lines 7, second Coupled Miccrostrip Lines 8.Wherein, the first open loop step electric impedance resonator 3, the second open loop step electric impedance resonator 4 are symmetrical arranged side by side, the opening of its open loop is provided with in opposite directions, be provided with first on the opposite of the first open loop step electric impedance resonator, 3 inner openings and load double branch line 5, be provided with second on the opposite of the second open loop step electric impedance resonator, 4 inner openings and load double branch line 6; First input/output terminal 1 is connected with the first open loop step electric impedance resonator 3, and second input/output terminal 2 is connected with the second open loop step electric impedance resonator 4; Be respectively equipped with first Coupled Miccrostrip Lines 7, second Coupled Miccrostrip Lines 8 in the both sides up and down of the first open loop step electric impedance resonator 3, the second open loop step electric impedance resonator 4.
First input/output terminal 1 is used for the feed-in electromagnetic wave signal, second input/output terminal 2 is used to feed out electromagnetic wave signal, first input/output terminal 1, second input/output terminal 2 be arranged in parallel, and be 50 ohm of matched impedances of double band bandpass filter 10, because input and output signal homophase when the fundamental frequency of resonator are so can be described as 0 ° of feed.Coupling in the first open loop step electric impedance resonator 3, the second open loop step electric impedance resonator, the 4 inner second slit g2 of employing come can equivalence be an electric capacity between the slit.Adopt the first slit g1 to come interstage coupling then between two open loop step electric impedance resonators.The first open loop step electric impedance resonator 3, the second open loop step electric impedance resonator 4 are narrower than the live width on all the other each limits in the live width that connects first input/output terminal 1, second input/output terminal, 2 one sides part, and all the other are all wide.By the first open loop step electric impedance resonator 3, the second open loop step electric impedance resonator, 4 resonance to fundamental frequency 2.4GHz.It is the corresponding mid portion of the left and right sides of each open loop step electric impedance resonator that the first loading double branch line 5, second loads double branch line 6, left-right symmetric.Can carry out certain adjusting to bandwidth, intermediate frequency, the flatness of second frequency band by changing its size and relative position.Two two ends up and down that the first parallel Coupled Miccrostrip Lines 7, second Coupled Miccrostrip Lines 8 place the open loop step electric impedance resonator, with the open loop step electric impedance resonator at a distance of the 3rd slit g3, increase interstage coupling, the bandwidth of broadening second frequency band.
See also Fig. 2, be depicted as datagram (dotted portion) that obtains by the emulation of HFSS software all-wave and the comparison of surveying the datagram (solid line part) that obtains by the Agilent network analyzer.We can see that the degree of agreement of measured curve and simulation curve is more satisfactory.
Transverse axis is represented to the present invention is based on the frequency of signal of double frequency band-pass filter 10 of double branch line loading stepped-impedance resonator (unit: GHz), the longitudinal axis is represented amplitude (unit: dB), comprise that the scattering parameter of transmission claims to insert loss (S again among the figure
21) amplitude and the scattering parameter (S of reflection
11) amplitude.
We can see that the double frequency band-pass filter 10 based on double branch line loading stepped-impedance resonator of the present invention has good two-band characteristic from figure.From curve | S
21| the insertion loss ratio that can observe in each passband is less, substantially about 1dB.Though between two passbands, have only a transmission zero since its zero point-below the 40dB, formed a satisfied transition slope between two passbands.Simultaneously from curve | S
11| can be observed, in passband the reflection coefficient absolute value of signal greater than 14dB, its absolute value even reached more than the 16dB in first frequency range.
Double frequency band-pass filter 10 based on double branch line loading stepped-impedance resonator of the present invention need not add assemblies such as any electric capacity, inductance, can pass through the length of the resonant element of adjusting filter, the size and the position that load double branch line and Coupled Miccrostrip Lines reach required band limits.Since feed-in of the present invention with feed out holding wire and be 50 ohm transmission line, so this filter does not need to be connected in series extra impedance transducer when linking to each other with other external module, actually for further having dwindled volume.
Claims (5)
1. double frequency band-pass filter based on double branch line loading stepped-impedance resonator, it is characterized in that this double band bandpass filter (10) is arranged on the substrate (20), comprise first input/output terminal (1), second input/output terminal (2), the first open loop step electric impedance resonator (3), the second open loop step electric impedance resonator (4), first loads double branch line (5), second loads double branch line (6), first Coupled Miccrostrip Lines (7), second Coupled Miccrostrip Lines (8); Wherein, the first open loop step electric impedance resonator (3), the second open loop step electric impedance resonator (4) are symmetrical arranged side by side, the opening of its open loop is provided with in opposite directions, be provided with first on the opposite of first open loop step electric impedance resonator (3) inner opening and load double branch line (5), be provided with second on the opposite of second open loop step electric impedance resonator (4) inner opening and load double branch line (6); First input/output terminal (1) is connected with the first open loop step electric impedance resonator (3), and second input/output terminal (2) is connected with the second open loop step electric impedance resonator (4); Be respectively equipped with first Coupled Miccrostrip Lines (7), second Coupled Miccrostrip Lines (8) in the both sides up and down of the first open loop step electric impedance resonator (3), the second open loop step electric impedance resonator (4).
2. the double frequency band-pass filter based on double branch line loading stepped-impedance resonator according to claim 1 is characterized in that described first input/output terminal (1), second input/output terminal (2) are respectively 50 ohm of matched impedances of described double frequency filter.
3. the double frequency band-pass filter based on double branch line loading stepped-impedance resonator according to claim 1, it is characterized in that the first open loop step electric impedance resonator (3), second open loop step electric impedance resonator (4) opening adopt second slit (g2) to come interior coupling, adopt first slit (g1) to come interstage coupling between two open loop step electric impedance resonators.
4. the double frequency band-pass filter based on double branch line loading stepped-impedance resonator according to claim 1 is characterized in that first Coupled Miccrostrip Lines (7), second Coupled Miccrostrip Lines (8) and the first open loop step electric impedance resonator (3), the second open loop step electric impedance resonator (4) are at a distance of the 3rd slit (g3).
5. the double frequency band-pass filter based on double branch line loading stepped-impedance resonator according to claim 1, it is characterized in that the first open loop step electric impedance resonator (3), the second open loop step electric impedance resonator (4) in the live width that connects first input/output terminal (1), second input/output terminal (2) one sides part, are narrower than the live width on all the other each limits.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102610879A (en) * | 2012-02-29 | 2012-07-25 | 南京航空航天大学 | Double-frequency band-pass filter |
| CN106207336A (en) * | 2016-08-24 | 2016-12-07 | 华东交通大学 | A kind of three-passband filter based on middle terminal shortcircuit step electric impedance resonator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101159350A (en) * | 2007-11-09 | 2008-04-09 | 南开大学 | Resonator group suitable for manufacturing linearity phase superconductivity filter |
| CN101599564A (en) * | 2009-07-09 | 2009-12-09 | 华南理工大学 | Controllable electromagnetic coupling microstrip split-ring resonator filter |
| CN201804985U (en) * | 2010-08-11 | 2011-04-20 | 东南大学 | Double-frequency band-pass filter capable of loading stepped impedance resonators based on double branch lines |
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2010
- 2010-08-11 CN CN 201010252393 patent/CN101916893B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101159350A (en) * | 2007-11-09 | 2008-04-09 | 南开大学 | Resonator group suitable for manufacturing linearity phase superconductivity filter |
| CN101599564A (en) * | 2009-07-09 | 2009-12-09 | 华南理工大学 | Controllable electromagnetic coupling microstrip split-ring resonator filter |
| CN201804985U (en) * | 2010-08-11 | 2011-04-20 | 东南大学 | Double-frequency band-pass filter capable of loading stepped impedance resonators based on double branch lines |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102610879A (en) * | 2012-02-29 | 2012-07-25 | 南京航空航天大学 | Double-frequency band-pass filter |
| CN102610879B (en) * | 2012-02-29 | 2014-06-11 | 南京航空航天大学 | Double-frequency band-pass filter |
| CN106207336A (en) * | 2016-08-24 | 2016-12-07 | 华东交通大学 | A kind of three-passband filter based on middle terminal shortcircuit step electric impedance resonator |
| CN106207336B (en) * | 2016-08-24 | 2019-02-26 | 华东交通大学 | A kind of three-passband filter based on middle terminal shortcircuit step electric impedance resonator |
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