CN103855450A - Microstrip broadband filter based on four-mode ring resonator - Google Patents
Microstrip broadband filter based on four-mode ring resonator Download PDFInfo
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- CN103855450A CN103855450A CN201210505037.0A CN201210505037A CN103855450A CN 103855450 A CN103855450 A CN 103855450A CN 201210505037 A CN201210505037 A CN 201210505037A CN 103855450 A CN103855450 A CN 103855450A
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- toroidal cavity
- mould
- cavity resonators
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- microstrip
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Abstract
The invention discloses a microstrip broadband filter based on a four-mode ring resonator. The filter comprises metal microstrip pasting sheets (30) which are formed on the upper and lower surfaces of a medium plate (40), and a metal grounding plate (50). Each metal microstrip pasting sheet comprises the four-mode ring resonator (10) and two stop-band parts (20, 21). The four-mode ring resonator is formed on the basis of combination and improvement of a stepped-impedance one-wavelength ring resonator (SORR) and a stepped-impedance half-wavelength resonator (SHR). The two stop-band parts adopt asymmetric pi-shaped structures and are applied to input and output parts. The microstrip broadband filter has characteristics of being compact in structure, wide in upper stop band, low in insertion loss in passband, etc.
Description
Technical field
The present invention relates to a kind of microstrip broadband band pass filter based on four mould toroidal cavity resonators; this broadband band-pass filter compact conformation, size are little; in passband, there is less insertion loss, there is wider upper stopband simultaneously, there is good broadband character and higher frequency selectivity.
Background technology
In recent years, along with ultra broadband (UWB) technology is in the continuous application of wireless communication technology and radio multimedium business, also accelerated the develop rapidly of broadband filter technology, diversified multimode resonator structure is widely used in the design of broadband filter, to improve the broadband character of filter.Although also comparatively satisfied from existing broadband-pass filter actual performance, the part that also comes with some shortcomings needs to be improved.
The existing broadband filter based on multimode resonator, as the broadband band-pass filter designing based on the comprehensive of bimodulus, three mode step shape electric impedance resonators or two kinds of resonators, relative bandwidth can reach more than 50%, but is difficult to obtain lower insertion loss.Carried out certain improvement for above-mentioned broadband filter afterwards, and introduced toroidal cavity resonator, and obtained lower logical in-band insertion loss, but still there is very large deficiency in the performances such as corresponding upper resistance band and frequency selection.Therefore the broadband band-pass filter that designs a kind of wide stopband, high-frequency selectivity and have a low insertion loss has great importance.
Summary of the invention
For performances such as resistance band, insertion loss on improving in existing broadband filter; the invention provides a kind of microstrip broadband filter based on four mould toroidal cavity resonators; wherein adopt four novel mould toroidal cavity resonators (10) to be used for improving performance in passband; adopt two band resistance parts of π type structure formation of asymmetry to divide (20,21) to be used for widening stopband.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of novel microstrip broadband band pass filter based on four mould toroidal cavity resonators; it is characterized in that; comprise the metal micro-strip paster (30) and the metal ground plate (50) that are formed at the upper and lower surface of dielectric-slab (40); described metal micro-strip paster comprise four mould toroidal cavity resonators (10), two band resistance parts divide (20,21).
The described microstrip broadband band pass filter based on four mould toroidal cavity resonators, is characterized in that, four mould toroidal cavity resonators (10) and two band resistance parts divide (20,21) to intercouple with Coupled Miccrostrip Lines.
The described microstrip broadband band pass filter based on four mould toroidal cavity resonators, is characterized in that, four mould toroidal cavity resonators (10) are combination and the improvement based on the long toroidal cavity resonator of scalariform impedance all-wave (SORR) and scalariform impedance half-wave resonator (SHR).
The described microstrip broadband band pass filter based on four mould toroidal cavity resonators; it is characterized in that; two band resistance parts divide (20; 21) adopt asymmetric π type structure applications in input/output section; object is to widen stopband, and it is by the unequal microstrip line counterfoil of two segment length (L that the π type band resistance part of asymmetric is divided
1, L
2) form.
The present invention has following advantage and characteristic with respect to prior art:
(1) compact conformation, size are little, are easy to processing, and make low price.
(2) 3dB relative bandwidth can reach more than 50%, and has wider upper stopband.
(3) there is precipitous walled belt and very high frequency selectivity.
(4) logical in-band insertion loss is very low, can reach below 1dB.
Accompanying drawing explanation
The basic structure vertical view of the broadband filter of Fig. 1 based on four mould toroidal cavity resonators;
The S parameters simulation figure of Fig. 2 filter;
Embodiment
In recent years; multimode ring type resonant device starts to be applied in the design of microstrip bandpass filter; this type filter makes full use of the characteristic that presents multiple modes of resonance in passband; realize multimode ring resonator and there is good broadband performance and its compact conformation; be easy to processing; applied widely, the present invention utilizes many resonance characteristics of resonance structure just, has designed a kind of low cost, high performance microstrip broadband band pass filter.
Below in conjunction with accompanying drawing, concrete structure of the present invention is further described.
As shown in Figure 1, the present invention divides (20,21) composition by four mould toroidal cavity resonators (10), two band resistance parts.Four mould toroidal cavity resonators and two band resistance parts are divided by Coupled Miccrostrip Lines and are intercoupled.
As shown in Figure 1, the each structure of this filter is of a size of:
L
1=7.99mm，L
2=6.03mm，L
3=18.47mm，?L
4=0.60mm，L
5=16.90mm，L
6=4.75mm，L
7=0.74mm，L
8=23.51mm，L
9=6.45mm?，L
10=6.3mm，L
11=2.36mm，W
1=1.13mm，W
2=7.50mm，s=0.37mm。
The selection of medium substrate (40): the medium substrate that the present invention adopts is of a size of 2cm*6cm, and its relative dielectric constant is 11.2, and this substrate price is lower, and loss is less, applied range.In practice, can adopt according to practical application the medium substrate of other dielectric constant loss angle, the dielectric constant loss angle of the medium substrate that the present invention adopts is 0.009, and its thickness is 1.6mm, meets required intensity.
The design of four mould toroidal cavity resonators (10): in recent years; multimode ring type resonant device starts to be widely applied in the design of microstrip broadband band pass filter; such filter takes full advantage of the characteristic that presents multiple modes of resonance in passband; realize multimode toroidal cavity resonator and there is good broadband performance and its compact conformation, be easy to processing.Four mould toroidal cavity resonators of the present invention design are combination and the improvement based on the long toroidal cavity resonator of scalariform impedance all-wave (SORR) and scalariform impedance half-wave resonator (SHR), its compact conformation, are easy to process, and can produce good band-pass behavior.Four mould toroidal cavity resonators of the present invention's design produce four transmission poles in passband, produce two transmission zeros at upper and lower cut-off frequency place, and the passband relative bandwidth of its generation can reach more than 55%, and has realized precipitous walled belt and high-frequency selectivity.
Two designs that (20,21) are divided in band resistance part: the present invention adopts the π type structure of asymmetric to form and is with resistance part to divide, is applied to input/output section and can widens stopband.Wherein to divide be by the unequal micro-band counterfoil (L of two segment length in the π type band resistance part of asymmetric
1, L
2) form, this structure can stopband part produce two transmission zeros on high frequency, thereby reaches the effect that suppresses harmonic effect, widens stopband.That two of this broadband band-pass filter divide connection with resistance part is common driving source (50 Ω).
In order to reduce the volume of filter, microstrip line is folded up.This design not only makes the structure of filter more compact, more can well realize communication.The filter of this practical design can not only be realized more than 55% relative bandwidth, and has higher frequency selectivity and good stopband characteristic, and logical in-band insertion loss is lower simultaneously, simple in structure, volume is little, is printed on the two sides of medium substrate, be convenient to batch production, debugging, and with low cost.
Use CST MICROWAVE STUDIO simulation software to carry out emulation to the filter of design, the S parameter obtaining as shown in Figure 2.
From Fig. 2, we see, centre frequency is at 1.7HZ, and-three dB bandwidth scope is 1.2HZ-2.2HZ, and relative bandwidth is 58.8%.Be less than 1dB by interior insertion loss, from figure, it can also be seen that, this filter has higher frequency selectivity and good stopband characteristic, in the frequency range from 3.1HZ to 5.1HZ harmonic effect can be pressed into-below 18dB.
Claims (4)
1. the novel microstrip broadband band pass filter based on four mould toroidal cavity resonators; it is characterized in that; comprise the metal micro-strip paster (30) and the metal ground plate (50) that are formed at the upper and lower surface of dielectric-slab (40); described metal micro-strip paster comprise four mould toroidal cavity resonators (10), two band resistance parts divide (20,21).
2. the microstrip broadband band pass filter based on four mould toroidal cavity resonators according to claim 1, is characterized in that, four mould toroidal cavity resonators (10) and two band resistance parts divide (20,21) to intercouple with Coupled Miccrostrip Lines.
3. the wideband microband band pass filter based on four mould toroidal cavity resonators according to claim 1; it is characterized in that, four mould toroidal cavity resonators (10) are combination and the improvement based on the long toroidal cavity resonator of scalariform impedance all-wave (SORR) and scalariform impedance half-wave resonator (SHR).
4. the wideband microband band pass filter based on four mould toroidal cavity resonators according to claim 1; it is characterized in that; two band resistance parts divide (20; 21) adopt asymmetric π type structure applications in input/output section; object is to widen stopband, and it is by the unequal microstrip line counterfoil of two segment length (L that the π type band resistance part of asymmetric is divided
1, L
2) form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210505037.0A CN103855450A (en) | 2012-11-30 | 2012-11-30 | Microstrip broadband filter based on four-mode ring resonator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210505037.0A CN103855450A (en) | 2012-11-30 | 2012-11-30 | Microstrip broadband filter based on four-mode ring resonator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103855450A true CN103855450A (en) | 2014-06-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210505037.0A Pending CN103855450A (en) | 2012-11-30 | 2012-11-30 | Microstrip broadband filter based on four-mode ring resonator |
Country Status (1)
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|---|---|
| CN (1) | CN103855450A (en) |
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2012
- 2012-11-30 CN CN201210505037.0A patent/CN103855450A/en active Pending
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Application publication date: 20140611 |