CN105322254A - Direct-feed planar dual-mode ring band-pass filter with adjustable bandwidth - Google Patents
Direct-feed planar dual-mode ring band-pass filter with adjustable bandwidth Download PDFInfo
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- CN105322254A CN105322254A CN201510801618.2A CN201510801618A CN105322254A CN 105322254 A CN105322254 A CN 105322254A CN 201510801618 A CN201510801618 A CN 201510801618A CN 105322254 A CN105322254 A CN 105322254A
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Abstract
The invention discloses a direct-feed planar dual-mode ring band-pass filter with an adjustable bandwidth. The direct-feed planar dual-mode ring band-pass filter comprises a double-sided copper clad medium plate, wherein metal on one surface is prepared into a ring dual-mode filter and a feed structure thereof; the metal on the other surface is completely reserved as metal ground; a ring dual-mode resonator comprises a capacitive load and a ring resonator; the capacitive load is formed by a microstrip line with an open circuit in the tail end; the ring resonator is in a square form; the capacitive load is arranged at one corner of the ring resonator; the capacitive load and two sides of the ring resonator form an included angle of 45 degrees; and the feed structure comprises a pair of quarter-wave microstrip lines with variable impedance to form an impedance transformer, so as to be matched with input and output ports. According to the direct-feed planar dual-mode ring band-pass filter with the adjustable bandwidth, the insertion loss of the filter is reduced under the premise of keeping the advantages of an original dual-mode filter; the bandwidth is also adjustable; and the direct-feed planar dual-mode ring band-pass filter can be widely applied to designing of a radio-frequency microwave passive circuit.
Description
Technical field
The present invention relates to microwave technical field, particularly relate to a kind of direct feed bandwidth adjustable plane bimodulus endless belt bandpass filter.
Background technology
Filter is a kind of passive device be widely used in microwave and radio frequency applications, and the quality of its index directly affects the performance of whole system.
Common microwave filter many employings metal waveguide/dielectric waveguide, coaxial line or planar microstrip line/strip line makes.
In recent years, the microminiaturized demand of the miniaturization due to communication system is strong all the more, as one of intrasystem Key Passive Components, also more and more higher to the Miniaturization Design demand of filter.Adopt the stereochemical structures such as the relative waveguide of microwave filter of planar technique or coaxial line to realize, there is structure simple, easy to process, cheap and be easy to the advantage integrated with other active/passive circuit, receive great concern in recent years.Wherein, the key object that the dual mode filter of circuited microstrip loop bimodulus resonant cavity is studied especially is adopted.
The core of annular dual mode filter is a toroidal cavity resonator having symmetry to load, frequency separation is produced because this loading makes a pair degeneracy mode of resonance of toroidal cavity resonator that coupling mutually occur, a resonator just can be utilized to produce two resonance peaks, be similar to the response that the singlemode resonance device of two cascades is right.Therefore the natural resonance device exponent number required for filter realization can reduce half, so just reaches miniaturized object.Simultaneously the intrinsic quality factor of ring resonator be also height than common half-wave resonator, and like this under identical realization, the insertion loss of dual mode filter also can reduce.When adopting capacitive to load, the transmission response of dual mode filter is similar to elliptic function response, namely can produce a transmission zero respectively at the two ends of passband, improve the Out-of-band rejection effect of filter greatly.
Existing dual mode filter adopts end capacitive coupling to carry out feed to bimodulus resonant cavity mostly, due to radiation and the edge effect of end electric capacity, this feeding classification can bring coupling loss and feeder loss, can strengthen the insertion loss of filter like this, have impact on the practical application of filter.
Summary of the invention
Technical problem to be solved by this invention is for defect involved in background technology; a kind of direct feed bandwidth adjustable plane bimodulus endless belt bandpass filter is provided; under the prerequisite maintaining original dual mode filter advantage, decrease the insertion loss of filter, and bandwidth also controllable.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
Direct feed bandwidth adjustable plane bimodulus endless belt bandpass filter, comprises the dielectric-slab of double-sided copper-clad, the one side metal of the dielectric-slab of described double-sided copper-clad as annular dual mode filter and and feed structure, the metal of another side is all retained as metal ground;
The capacitive that the microstrip line that described annular dual-mode resonator comprises a terminal open circuit is formed loads and a toroidal cavity resonator;
Described toroidal cavity resonator is square, and described capacitive loads and is arranged on an angle of described toroidal cavity resonator, and is 45 ° of angles with the both sides of described toroidal cavity resonator;
Described feed structure adopts the microstrip line directly connected.
As the further prioritization scheme of direct feed bandwidth adjustable plane bimodulus endless belt bandpass filter of the present invention; described feed structure comprises quarter-wave microstrip line, the input microstrip line of a pair impedance variable and exports microstrip line, and described input microstrip line is connected with described annular dual-mode resonator with the quarter-wave microstrip line of output microstrip line respectively by an impedance variable.
As the further prioritization scheme of direct feed bandwidth adjustable plane bimodulus endless belt bandpass filter of the present invention; characteristic impedance 50 ohm got by input microstrip line and output microstrip line; length got by toroidal cavity resonator is 12.0 millimeters, live width 1.0 millimeters; the length of the quarter-wave microstrip line of impedance variable gets 10.0 millimeters; capacitive loads and gets width 0.7 millimeter; dielectric constant 10 thickness 1.0 millimeters selected by dielectric-slab; capacitive loads and gets length 7.0 millimeters, and the width of the quarter-wave microstrip line of impedance variable gets 0.3 millimeter.
As the further prioritization scheme of direct feed bandwidth adjustable plane bimodulus endless belt bandpass filter of the present invention; characteristic impedance 50 ohm got by input microstrip line and output microstrip line; length got by toroidal cavity resonator is 12.0 millimeters, live width 1.0 millimeters; the length of the quarter-wave microstrip line of impedance variable gets 10.0 millimeters; capacitive loads and gets width 0.7 millimeter; dielectric constant 10 thickness 1.0 millimeters selected by dielectric-slab; capacitive loads and gets length 5.5 millimeters, and the width of the quarter-wave microstrip line of impedance variable gets 0.2 millimeter.
As the further prioritization scheme of direct feed bandwidth adjustable plane bimodulus endless belt bandpass filter of the present invention; characteristic impedance 50 ohm got by input microstrip line and output microstrip line; length got by toroidal cavity resonator is 12.0 millimeters, live width 1.0 millimeters; the length of the quarter-wave microstrip line of impedance variable gets 10.0 millimeters; capacitive loads and gets width 0.7 millimeter; dielectric constant 10 thickness 1.0 millimeters selected by dielectric-slab; capacitive loads and gets length 4.0 millimeters, and the width of the quarter-wave microstrip line of impedance variable gets 0.1 millimeter.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
1. structure is simple, size is little;
2. be easy to making, loss is little;
3. bandwidth is adjustable.
Accompanying drawing explanation
Accompanying drawing 1 is structural representation of the present invention;
Accompanying drawing 2 is that bimodulus band leads to the transmission of loop filter and the schematic diagram of reflection characteristic.
In figure, 1-I/O microstrip line, 2-quarter wavelength impedance transducer, 3-toroidal cavity resonator, 4-terminal open circuit microstrip line loads, 5-dielectric-slab.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
The invention discloses a kind of direct feed bandwidth adjustable plane bimodulus endless belt bandpass filter, comprise the dielectric-slab of double-sided copper-clad, the one side metal of the dielectric-slab of described double-sided copper-clad as annular dual mode filter and and feed structure, the metal of another side is all retained as metal ground;
The capacitive that the microstrip line that described annular dual-mode resonator comprises a terminal open circuit is formed loads and a toroidal cavity resonator;
Described toroidal cavity resonator is square, and described capacitive loads and is arranged on an angle of described toroidal cavity resonator, and is 45 ° of angles with the both sides of described toroidal cavity resonator;
Described feed structure adopts the microstrip line directly connected.
Described feed structure comprises quarter-wave microstrip line, the input microstrip line of a pair impedance variable and exports microstrip line, and described input microstrip line is connected with described annular dual-mode resonator with the quarter-wave microstrip line of output microstrip line respectively by an impedance variable.
Embodiment 1: as shown in Figure 1, characteristic impedance 50 ohm got by input microstrip line and output microstrip line, length got by toroidal cavity resonator is 12.0 millimeters, live width 1.0 millimeters, the length of the quarter-wave microstrip line of impedance variable gets 10.0 millimeters, capacitive loads and gets width 0.7 millimeter, and dielectric constant 10 thickness 1.0 millimeters selected by dielectric-slab.In order to realize mating in the good band of band pass filter, capacitive loads and gets length 7.0 millimeters, and the width of the quarter-wave microstrip line of impedance variable gets 0.3 millimeter.
Embodiment 2: as shown in Figure 2, characteristic impedance 50 ohm got by input microstrip line and output microstrip line, length got by toroidal cavity resonator is 12.0 millimeters, live width 1.0 millimeters, the length of the quarter-wave microstrip line of impedance variable gets 10.0 millimeters, capacitive loads and gets width 0.7 millimeter, and dielectric constant 10 thickness 1.0 millimeters selected by dielectric-slab.In order to realize mating in the good band of band pass filter, capacitive loads and gets length 5.5 millimeters, and the width of the quarter-wave microstrip line of impedance variable gets 0.2 millimeter.
Embodiment 3: as shown in Figure 1, characteristic impedance 50 ohm got by input microstrip line and output microstrip line, length got by toroidal cavity resonator is 12.0 millimeters, live width 1.0 millimeters, the length of the quarter-wave microstrip line of impedance variable gets 10.0 millimeters, capacitive loads and gets width 0.7 millimeter, and dielectric constant 10 thickness 1.0 millimeters selected by dielectric-slab.In order to realize mating in the good band of band pass filter, capacitive loads and gets length 4.0 millimeters, and the width of the quarter-wave microstrip line of impedance variable gets 0.1 millimeter.
Fig. 2 gives the filter scattering parameters curve of above-mentioned three embodiments, and this novel dual mode filter method for designing of this employing, can improve performance of filter significantly as seen from the figure.As seen from the figure, by adopting different disturbance cell size, and the corresponding width changing impedance transformer, the adjustment of filter bandwidht can be realized; Coupling simultaneously in passband is good, and S21 is all below-30dB, and in-band insertion loss is minimum is only 0.3dB; And can see that the biobelt of dual mode filter transmits null characteristic outward and all retained.Experiment shows, this design of filter can significantly improve the actual application value of dual mode filter, and structure is simplified, conveniently processed simultaneously.
Those skilled in the art of the present technique are understandable that, unless otherwise defined, all terms used herein (comprising technical term and scientific terminology) have the meaning identical with the general understanding of the those of ordinary skill in field belonging to the present invention.Should also be understood that those terms defined in such as general dictionary should be understood to have the meaning consistent with the meaning in the context of prior art, unless and define as here, can not explain by idealized or too formal implication.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. direct feed bandwidth adjustable plane bimodulus endless belt bandpass filter, comprises the dielectric-slab of double-sided copper-clad, it is characterized in that:
The one side metal of the dielectric-slab of described double-sided copper-clad as annular dual mode filter and and feed structure, the metal of another side is all retained as metal ground;
The capacitive that the microstrip line that described annular dual-mode resonator comprises a terminal open circuit is formed loads and a toroidal cavity resonator;
Described toroidal cavity resonator is square, and described capacitive loads and is arranged on an angle of described toroidal cavity resonator, and is 45 ° of angles with the both sides of described toroidal cavity resonator;
Described feed structure adopts the microstrip line directly connected.
2. direct feed bandwidth adjustable plane bimodulus endless belt according to claim 1 bandpass filter; it is characterized in that; described feed structure comprises quarter-wave microstrip line, the input microstrip line of a pair impedance variable and exports microstrip line, and described input microstrip line is connected with described annular dual-mode resonator with the quarter-wave microstrip line of output microstrip line respectively by an impedance variable.
3. direct feed bandwidth adjustable plane bimodulus endless belt according to claim 2 bandpass filter; it is characterized in that; characteristic impedance 50 ohm got by input microstrip line and output microstrip line; length got by toroidal cavity resonator is 12.0 millimeters, live width 1.0 millimeters; the length of the quarter-wave microstrip line of impedance variable gets 10.0 millimeters; capacitive loads and gets width 0.7 millimeter; dielectric constant 10 thickness 1.0 millimeters selected by dielectric-slab; capacitive loads and gets length 7.0 millimeters, and the width of the quarter-wave microstrip line of impedance variable gets 0.3 millimeter.
4. direct feed bandwidth adjustable plane bimodulus endless belt according to claim 2 bandpass filter; it is characterized in that; characteristic impedance 50 ohm got by input microstrip line and output microstrip line; length got by toroidal cavity resonator is 12.0 millimeters, live width 1.0 millimeters; the length of the quarter-wave microstrip line of impedance variable gets 10.0 millimeters; capacitive loads and gets width 0.7 millimeter; dielectric constant 10 thickness 1.0 millimeters selected by dielectric-slab; capacitive loads and gets length 5.5 millimeters, and the width of the quarter-wave microstrip line of impedance variable gets 0.2 millimeter.
5. direct feed bandwidth adjustable plane bimodulus endless belt according to claim 2 bandpass filter; it is characterized in that; characteristic impedance 50 ohm got by input microstrip line and output microstrip line; length got by toroidal cavity resonator is 12.0 millimeters, live width 1.0 millimeters; the length of the quarter-wave microstrip line of impedance variable gets 10.0 millimeters; capacitive loads and gets width 0.7 millimeter; dielectric constant 10 thickness 1.0 millimeters selected by dielectric-slab; capacitive loads and gets length 4.0 millimeters, and the width of the quarter-wave microstrip line of impedance variable gets 0.1 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510801618.2A CN105322254A (en) | 2015-11-19 | 2015-11-19 | Direct-feed planar dual-mode ring band-pass filter with adjustable bandwidth |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510801618.2A CN105322254A (en) | 2015-11-19 | 2015-11-19 | Direct-feed planar dual-mode ring band-pass filter with adjustable bandwidth |
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| CN105322254A true CN105322254A (en) | 2016-02-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2567962A (en) * | 2017-10-11 | 2019-05-01 | Radio Design Ltd | Resonator apparatus and method of use thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1108826A (en) * | 1994-10-05 | 1995-09-20 | 松下电器产业株式会社 | Electric filter |
| JPH09139612A (en) * | 1995-11-16 | 1997-05-27 | Matsushita Electric Ind Co Ltd | Dual mode filter |
| JP2001102806A (en) * | 1999-09-30 | 2001-04-13 | Ikuo Awai | Dual mode filter and design method therefor |
| CN101635383A (en) * | 2009-08-26 | 2010-01-27 | 东南大学 | Micro-strip dual-mode filter with intensified coupling and harmonic suppression characteristics |
| CN101694898A (en) * | 2009-10-16 | 2010-04-14 | 南京邮电大学 | Bimodule annular resonant cavity band-pass filter with direct feed planar structure |
| CN104779424A (en) * | 2015-04-13 | 2015-07-15 | 南京邮电大学 | Microstrip dual-passband coupling filter |
-
2015
- 2015-11-19 CN CN201510801618.2A patent/CN105322254A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1108826A (en) * | 1994-10-05 | 1995-09-20 | 松下电器产业株式会社 | Electric filter |
| JPH09139612A (en) * | 1995-11-16 | 1997-05-27 | Matsushita Electric Ind Co Ltd | Dual mode filter |
| JP2001102806A (en) * | 1999-09-30 | 2001-04-13 | Ikuo Awai | Dual mode filter and design method therefor |
| CN101635383A (en) * | 2009-08-26 | 2010-01-27 | 东南大学 | Micro-strip dual-mode filter with intensified coupling and harmonic suppression characteristics |
| CN101694898A (en) * | 2009-10-16 | 2010-04-14 | 南京邮电大学 | Bimodule annular resonant cavity band-pass filter with direct feed planar structure |
| CN104779424A (en) * | 2015-04-13 | 2015-07-15 | 南京邮电大学 | Microstrip dual-passband coupling filter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2567962A (en) * | 2017-10-11 | 2019-05-01 | Radio Design Ltd | Resonator apparatus and method of use thereof |
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