CN203760605U - Microstrip-switchable band-pass filter with novel structure - Google Patents
Microstrip-switchable band-pass filter with novel structure Download PDFInfo
- Publication number
- CN203760605U CN203760605U CN201320771969.XU CN201320771969U CN203760605U CN 203760605 U CN203760605 U CN 203760605U CN 201320771969 U CN201320771969 U CN 201320771969U CN 203760605 U CN203760605 U CN 203760605U
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- China
- Prior art keywords
- microstrip
- changeable
- metal patch
- bandpass filter
- resonator
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Abstract
The utility model relates to a microstrip-switchable band-pass filter with a novel structure. The microstrip-switchable band-pass filter comprises a first metal patch (1), a second metal patch (3) and a dielectric substrate (2); the first metal patch is coated on an upper surface of the dielectric substrate; the second metal patch is coated on a lower surface of the dielectric substrate; the first metal patch comprises an input port (6), an output port (7), a pair of parallel coupled lines (5), a folding line (4) with a certain angle, and a ring patch resonator (8) which is arranged above the folding line, wherein the parallel coupled lines are arranged above the input and output ports. The microstrip-switchable band-pass filter with the novel structure has the characteristics of being novel in structure, small in size, easy in processing, cheap in manufacturing price, wide in application range, and the like.
Description
Technical field
The utility model relates to a kind of double frequency three switchable microstrip bandpass filter frequently of new structure, belongs to the design field of microwave and millimetric wave device.
Background technology
In recent years, flourish along with wireless communication system and mobile phone telephony, the radio-frequency devices with dual frequency characteristics is with a wide range of applications.In traditional communication system, each communication system has its independently device such as antenna, filter, LNA, and volume and the loss of shining into whole system are all larger.If above radio-frequency (RF) component is all designed to frequently standards of double frequency standard or three, the volume of so whole communication system will dwindle greatly, and power consumption reduces greatly, is convenient to the system integration.Therefore, study novel double frequency even three filter tools be frequently of great significance.
The normal method for designing adopting of microstrip bandpass filter mainly contains three kinds.The first is band pass filter of cascade and a band stop filter, and the problem of bringing is that size is larger.The second is to utilize step electric impedance resonator, can be by regulating two-part impedance ratio and electrical length to control two resonance frequencys of resonator, and still the bandwidth of two passbands is very difficult independent adjustable, and the frequency selectivity of filter can be poor.The third is to adopt identical input and output feeder line by two resonator formation double band bandpass filters that combine independently.But it is very few to utilize single resonator to realize the method for designing of double frequency or three band pass filter frequently.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of double frequency three switchable microstrip bandpass filter frequently that relates to millimeter wave and microwave device is provided, and this filter construction novelty, can switch frequently at double frequency and three.
The technical scheme that the utility model adopts:
A kind of changeable microstrip bandpass filter of new structure, it is characterized in that: comprise the first metal patch (3), the second metal patch (1) and dielectric substrate (2), two described metal patches are coated on respectively the upper of dielectric substrate, lower surface, the first metal patch is by input port (6), output port (7), and be positioned at the pair of parallel coupling line (5) of input/output port top, the fold line (4) with certain angle with and annular patch resonator (8) composition of top, wherein annular patch resonator (8) comprises four arc guide grooves (9) and two radially-directed grooves (10).
The changeable microstrip bandpass filter of described new structure, is characterized in that: four the camber gathering sills (9) in described annular patch resonator are all identical, and are evenly distributed in annular patch resonator.
The changeable microstrip bandpass filter of described new structure, it is characterized in that: described annular paster syntonizer has two identical radially-directed grooves (10), two radially-directed grooves (10) extend to center from edge, and two radially-directed grooves are about Central Symmetry.
The changeable microstrip bandpass filter of described new structure, is characterized in that: fold line (4) is made up of two high-impedance transmission line, and two high-impedance transmission line are directly connected with annular patch resonator as impedance transducer.
The utility model adopts technique scheme compared with prior art, has following advantage and characteristic:
(1) single resonator composition, compact conformation, size are little, are easy to processing, and make low price.
(2), in the center frequency point of fixed filters passband, can realize by changing the interior radius of circle of toroidal cavity resonator the conversion of double frequency-band and three frequency bands.
(3) by changing the flexibility of the arc wizard groove in annular patch resonator, or the size of the dielectric constant of change dielectric-slab can be adjusted the size of passband and the position of center frequency point of filter.
(4) by regulating the size of fold line and parallel coupled line, can adjust the stopband position that produces indentation, improve the outer performance of band of filter.
Brief description of the drawings
Fig. 1 is the basic structure stereogram of the changeable microstrip bandpass filter of a kind of new structure described in the utility model;
Fig. 2 is the changeable microstrip bandpass filter basic structure end view of a kind of new structure described in the utility model;
Fig. 3 is the basic structure front view of the changeable microstrip bandpass filter of a kind of new structure described in the utility model;
Embodiment
In recent years, multimode resonance starts to be applied in the design of microstrip bandpass filter, and this type filter makes full use of the characteristic that presents multiple modes of resonance in passband, realizes multi-mode resonant filter and has many band-pass behavior.Compared with other double-passband filter, the compact conformation of this filter, is easy to processing, applied widely.The utility model utilizes many resonance characteristics of resonance structure just, has designed a kind of novel structure, low cost, high-performance, the double frequency that the scope of application is wider and three switchable band pass filter frequently.
Below in conjunction with accompanying drawing, concrete structure of the present utility model is further described.
As shown in Figure 1, the changeable microstrip bandpass filter of new structure described in the utility model adopts the dielectric-slab manufacture of two-sided copper foil covered, and the relative dielectric constant of dielectric substrate (2) is 10.8, and thickness is 0.762mm.Wherein, dielectric substrate (2) upper surface is the first metal patch (3), and the lower surface of dielectric substrate (2) is the second metal patch (1).Described the first metal patch (3) comprises annular patch resonator (8), fold line (4), parallel coupled line (5), input port (6), output port (7), wherein toroidal cavity resonator (8) is to be theta by equally distributed four angle of bend camber gathering sill (9) the radially-directed groove (10) identical with two forms.
Fig. 2 is the basic structure end view of the changeable microstrip bandpass filter of new structure, and wherein 3 is the first metal patch, and 1 is the second metal patch, and 2 is dielectric substrate.
In Fig. 3, R
cand R
c2be respectively exradius and the interior radius of circle of annular patch resonator, R
c1for the radius of arc guide groove, the angle of bend that theta is arc guide groove, W
cand L
cbe respectively width and the length of radially-directed groove, W
sfor the width of fold line, L
sfor the length of fold line, the length of parallel coupled line is L
p, the distance between two parallel coupled lines is S.
Realize the characteristic of bilateral band by arranging of this structure different parameters, along with the variation of some structural parameters of filter, the passband bandwidth of this filter is changing, and center frequency point is also changing.Meanwhile, change the size of the interior ring radius of annular patch resonator in this filter, can realize filter and take to from double frequency the switching of three frequency bands.
Claims (4)
1. the changeable microstrip bandpass filter of a new structure, it is characterized in that: comprise the first metal patch (3), the second metal patch (1) and dielectric substrate (2), two described metal patches are coated on respectively the upper of dielectric substrate, lower surface, the first metal patch is by input port (6), output port (7), and be positioned at input, the pair of parallel coupling line (5) of output port top, the fold line (4) with certain angle with and annular patch resonator (8) composition of top, wherein annular patch resonator (8) comprises four arc guide grooves (9) and two radially-directed grooves (10).
2. the changeable microstrip bandpass filter of new structure according to claim 1, is characterized in that: four the camber gathering sills (9) in described annular patch resonator are all identical, and are evenly distributed in annular patch resonator.
3. the changeable microstrip bandpass filter of new structure according to claim 1, it is characterized in that: described annular paster syntonizer has two identical radially-directed grooves (10), two radially-directed grooves (10) extend to center from edge, and two radially-directed grooves are about Central Symmetry.
4. the changeable microstrip bandpass filter of new structure according to claim 1, is characterized in that: fold line (4) is made up of two high-impedance transmission line, two high-impedance transmission line are directly connected with annular patch resonator as impedance transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320771969.XU CN203760605U (en) | 2013-11-27 | 2013-11-27 | Microstrip-switchable band-pass filter with novel structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320771969.XU CN203760605U (en) | 2013-11-27 | 2013-11-27 | Microstrip-switchable band-pass filter with novel structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203760605U true CN203760605U (en) | 2014-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320771969.XU Expired - Fee Related CN203760605U (en) | 2013-11-27 | 2013-11-27 | Microstrip-switchable band-pass filter with novel structure |
Country Status (1)
| Country | Link |
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| CN (1) | CN203760605U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104202005A (en) * | 2014-09-18 | 2014-12-10 | 王少夫 | Adjustable annular coupler |
-
2013
- 2013-11-27 CN CN201320771969.XU patent/CN203760605U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104202005A (en) * | 2014-09-18 | 2014-12-10 | 王少夫 | Adjustable annular coupler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140806 Termination date: 20151127 |