CN105161799A - Microwave adjustable filter - Google Patents
Microwave adjustable filter Download PDFInfo
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- CN105161799A CN105161799A CN201510526759.8A CN201510526759A CN105161799A CN 105161799 A CN105161799 A CN 105161799A CN 201510526759 A CN201510526759 A CN 201510526759A CN 105161799 A CN105161799 A CN 105161799A
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- dual
- mode resonator
- medium substrate
- feeder line
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Abstract
The invention relates to an electronic component, in particular to a microwave adjustable filter. The upper surface of a metal support plate is bonded with the lower surface of a dielectric substrate; a groove is arranged on the upper surface of the metal support plate; the groove is filled with a liquid crystal material; a dual-mode resonator having a cross structure is arranged on the lower surface of the dielectric substrate; the tail end of the dual-mode resonator is connected with a branch line; adjacent two sides of the dielectric substrate are respectively provided with a first input-output feeding line of the dual-mode resonator and a second input-output feeding line of the dual-mode resonator; a first feeding line and a second feeding line are arranged on the upper surface of the dielectric substrate; a first trapezoid transition structure and a second trapezoid transition structure are respectively arranged on the first feeding line and the second feeding line; the first input-output feeding line of the dual-mode resonator is connected with the first trapezoid transition structure; and the second input-output feeding line of the dual-mode resonator is connected with the second trapezoid transition structure. By the microwave adjustable filter, effective liquid crystal package can be achieved, the problem of impedance discontinuity is solved, and frequency response is continuous and adjustable.
Description
Technical field
The present invention relates to a kind of electronic devices and components, be specially microwave tunable filter.
Background technology
Along with the fast development of Modern wireless communication technology, the problem of frequency congestion becomes increasingly conspicuous, increasing applied environment all requires that its electronic equipment used possesses tunable, multiband (pattern), the feature such as multi-functional, thus improves the utilance of frequency spectrum resource.In addition, in the technology such as spread spectrum, frequency hopping and dynamic frequency allocation, tunable filter is also the Primary Component realizing these technology.Therefore, lightweight, low tuning voltage, tuned speed is fast, tuning range is wide etc. becomes the requirement of tunable filter design.
Existing public technology realizes the tunable technology of microwave device and mainly comprises: ferrite ferroelectric materials tuned, variable diodes are tuning, radio-frequency micro electromechanical system (RFMEMS) is tuning.The tuned speed of ferrite device is slow, volume large, thus limits its application; Ferroelectric material such as BST tunable technology is that the linearity is poor on the one hand, Ba simultaneously
0.45sr
0.55tiO
3the density of material is 5.9-6.0g/cm
3, and adopt the density of liquid crystal material to be 1.0096g/cm
3therefore under the same terms, the weight of employing BST ferroelectric thin film will much larger than liquid crystal, adopt liquid crystal material advantageously in the applied environment of light weight as mobile device, aerospace equipment etc., in addition, the tuning voltage required for BST ferroelectric thin-film technology is adopted to be up to 30V, also much larger than the tuning voltage used when adopting liquid crystal tuning (the highest be about 10V); The tuned speed of variable capacitance diode is fast, the bias voltage circuit more complicated of this technology, and the linearity is not good simultaneously; RFMEMS performance index are relatively good, but the loss ratio of this technology is comparatively large, simultaneously its bias voltage circuit more complicated, and cost is higher.
Performance index based on the microwave tunable filter of conventional art can not meet the requirement of technical development completely, so use new material, new technology, new technology, microwave tunable filter that new method processability is more excellent to be the trend of development.The field of nearest appearance causes a kind of novel tuning implementation of the tuning conduct of liquid crystal, there is the advantages such as cheap and miniaturized, operating voltage is lower and easy to make simultaneously, utilize the feature of its dielectric constant electric field-tunable making tunable optic filter can make up the deficiency of traditional structure, it is lightweight simultaneously, tuning voltage is low, more can adapt to the requirement in modern project application.
But existing encapsulation technology exists liquid crystal fixes and the problem revealed, also has the problem of impedance mismatching simultaneously.
Summary of the invention
The object of this invention is to provide a kind of microwave tunable filter based on liquid crystal material for above-mentioned technical problem, solve liquid crystal in existing encapsulation technology and fix problem with the problem revealed and impedance mismatching.
Concrete technical scheme is:
Microwave tunable filter, comprise medium substrate, metal support plate, dual-mode resonator, described metal support plate upper surface is bonded in medium substrate lower surface, metal support plate upper surface is fluted, filling liquid crystal material in groove, medium substrate leaves the first aperture and second orifice for pouring into liquid crystal material in groove; Metal support plate is arranged on medium substrate lower surface, medium substrate lower surface has the dual-mode resonator of cross structure, the end of dual-mode resonator connects minor matters line, and the adjacent both sides of medium substrate have dual-mode resonator first input and output feeder line and dual-mode resonator second input and output feeder line respectively; The upper surface of medium substrate is provided with the first feeder line and the second feeder line, first feeder line and the second feeder line have the first trapezoidal transition structure and the second trapezoidal transition structure respectively, and dual-mode resonator first input and output feeder line is by the first metallization via hole, the first metallization via pad and the first trapezoidal transition anatomical connectivity on medium substrate; Dual-mode resonator second input and output feeder line is by the second metallization via hole, the second metallization via pad and the second trapezoidal transition anatomical connectivity on medium substrate.
Medium substrate and metal support plate, when assembling, to be sticked together the encapsulation achieved liquid crystal material by conducting resinl.
By Bias-T by after on external modulation voltage-drop loading to radiofrequency signal, via dual-mode resonator first input and output feeder line and the input of dual-mode resonator second input and output feeder line of medium substrate; When modulation signal amplitude is 0, parallel to each other between the major axis of liquid crystal material molecules, and be parallel to medium substrate, dielectric constant is now less.When modulation signal amplitude increases, the sensing of being inverted liquid crystal material molecules in microstrip structure can deflect to direction of an electric field gradually, when bias voltage is enough high and when reaching the saturation voltage of liquid crystal material, the polarization of nematic crystal reaches capacity, and its dielectric constant increases thereupon and reaches a maximum in the process.
Because the dielectric constant of liquid crystal material can change along with the change of modulated voltage signal, the electrical length of resonator is also along with change, thus its resonance frequency ensues change, and finally realizes continuously adjustable filter freguency response.
Microwave tunable filter provided by the invention, metal support plate etches certain thickness groove, can effective encapsulated liquid crystal; The mode of punching is adopted the inversion microstrip line of liquid crystal material contact portion to be transitioned into the microstrip line construction of upper strata blocked impedance, and adopt the method for trapezoid impedance transition to reach the object of impedance matching in the part of middle transition, thus solve impedance discontinuity sex chromosome mosaicism; Dual-mode resonator, and adopt the method loading cross open circuit pipe nipple line to make two modal cutoff, the feeder line of input and output adopts the mode of direct contact type feed, thus maintain the low frequency channel of whole filter, in order to load low frequency modulations voltage thus solve tradition coupling due to discontinuity cannot the problem of load-modulate voltage; Adopt the method for External electrical field modulation liquid crystal, make the dielectric constant continuously adjustabe within the specific limits of liquid crystal, thus achieve the continuously adjustabe of this filter freguency response.
Accompanying drawing explanation
Fig. 1 is medium substrate lower surface configuration schematic diagram of the present invention;
Fig. 2 is medium substrate surface structure schematic diagram of the present invention;
Fig. 3 is metal support plate surface structure schematic diagram of the present invention.
Embodiment
Accompanying drawings concrete technical scheme of the present invention.
As shown in Figure 1, Figure 2 and Figure 3, microwave tunable filter, comprise medium substrate 1, metal support plate 13, dual-mode resonator 17, described metal support plate 13 upper surface is bonded in medium substrate 1 lower surface, metal support plate 13 upper surface is fluted, filling liquid crystal material 16 in groove, medium substrate 1 leaves the first aperture 7 and second orifice 12 for pouring into liquid crystal material 16 in groove;
Metal support plate 13 is arranged on medium substrate 1 lower surface, medium substrate 1 lower surface has the dual-mode resonator 17 of cross structure, the end of dual-mode resonator 17 connects minor matters line 15, and the adjacent both sides of medium substrate 1 have dual-mode resonator first input and output feeder line 6 and dual-mode resonator second input and output feeder line 8 respectively;
The upper surface of medium substrate 1 is provided with the first feeder line 2 and the second feeder line 14, first feeder line 2 and the second feeder line 14 have the first trapezoidal transition structure 3 and the second trapezoidal transition structure 11 respectively, and dual-mode resonator first input and output feeder line 6 is connected with the first trapezoidal transition structure 3 by the first metallization via hole 5, first metallization via pad 4 on medium substrate 1; Dual-mode resonator second input and output feeder line 8 is connected with the second trapezoidal transition structure 11 by the second metallization via hole 9, second metallization via pad 10 on medium substrate 1.
This microwave tunable filter, metal support plate 13 etches certain thickness groove, then by medium substrate 1 and metal support plate 13 by conduct electricity gluing with together with, then by the first aperture 7 and second orifice 12 for pouring into liquid crystal material 16 in groove; Dual-mode resonator 17 object of cross structure is adopted to be realize miniaturization at medium substrate 1 lower surface; The modal cutoff of dual-mode resonator 17 adopts the mode loading open circuit minor matters line 15 to realize, two patterns, i.e. TM
100mould and TM
010coupling amount between mould is by the cut to lengthen of minor matters line 15.Dual-mode resonator 17 and dual-mode resonator first input and output feeder line 6 and dual-mode resonator second input and output feeder line 8 are positioned at medium substrate 1 lower surface, and contact with liquid crystal material 16, are formed and are inverted microstrip structure.The frequency response wanted is formed when external signal enters microwave tunable filter by the first feeder line 2 and the second feeder line 14, simultaneously, low-frequency modulation signal together with Signal averaging also changes its dielectric constant by being inverted micro-band portion and modulating liquid crystal, thus forming frequency response is adjustable.Dual-mode resonator first input and output feeder line 6 and dual-mode resonator second input and output feeder line 8 are transitioned into medium substrate 1 upper surface respectively by the first metallization via hole 5, second metallization via hole 9 through medium substrate 1 and form micro-band model, then be connected with the second feeder line 14 with 50 ohm of input and output first feeder lines 2 of external stability with the second trapezoidal transition structure 11 respectively by the first trapezoidal transition structure 3, thus form complete filter.When work, radiofrequency signal and modulated voltage signal input the first feeder line 2 and the second feeder line 14, and the amplitude then by changing modulation voltage modulates the dielectric constant of liquid crystal material 16, finally obtains continuously adjustable frequency response.
Claims (1)
1. microwave tunable filter, it is characterized in that: comprise medium substrate (1), metal support plate (13), dual-mode resonator (17), described metal support plate (13) upper surface is bonded in medium substrate (1) lower surface, metal support plate (13) upper surface is fluted, filling liquid crystal material (16) in groove, medium substrate (1) leaves the first aperture (7) and second orifice (12) for pouring into liquid crystal material (16) in groove;
Medium substrate (1) lower surface has the dual-mode resonator (17) of cross structure, the end of dual-mode resonator (17) connects minor matters line (15), and medium substrate (1) adjacent both sides have dual-mode resonator first input and output feeder line (6) and dual-mode resonator second input and output feeder line (8) respectively;
The upper surface of medium substrate (1) is provided with the first feeder line (2) and the second feeder line (14), first feeder line (2) and the second feeder line (14) have the first trapezoidal transition structure (3) and the second trapezoidal transition structure (11) respectively, and dual-mode resonator first input and output feeder line (6) are connected with the first trapezoidal transition structure (3) by the first metallization via hole (5) on medium substrate (1), the first metallization via pad (4); Dual-mode resonator second input and output feeder line (8) are connected with the second trapezoidal transition structure (11) by the second metallization via hole (9) on medium substrate (1), the second metallization via pad (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510526759.8A CN105161799B (en) | 2015-08-25 | 2015-08-25 | Microwave tunable filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510526759.8A CN105161799B (en) | 2015-08-25 | 2015-08-25 | Microwave tunable filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105161799A true CN105161799A (en) | 2015-12-16 |
| CN105161799B CN105161799B (en) | 2019-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510526759.8A Expired - Fee Related CN105161799B (en) | 2015-08-25 | 2015-08-25 | Microwave tunable filter |
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| CN (1) | CN105161799B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112105144A (en) * | 2020-11-17 | 2020-12-18 | 南京天朗防务科技有限公司 | Circuit board structure and using method thereof |
Citations (6)
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|---|---|---|---|---|
| CN101593863A (en) * | 2009-06-26 | 2009-12-02 | 北京信息科技大学 | A kind of adjustable microwave band-pass filter |
| CN103311614A (en) * | 2013-05-09 | 2013-09-18 | 上海海事大学 | Dual-mode micro-band bandpass filter of crossed patch |
| CN103474731A (en) * | 2013-09-05 | 2013-12-25 | 湖北文理学院 | Branch knot loading compact type microstrip filter |
| CN104393378A (en) * | 2014-11-24 | 2015-03-04 | 电子科技大学 | Continuously adjustable band-pass filter based on nematic liquid crystal |
| CN104466307A (en) * | 2014-11-24 | 2015-03-25 | 电子科技大学 | Phase shifter |
| CN204905393U (en) * | 2015-08-25 | 2015-12-23 | 电子科技大学 | Microwave tunable filter |
-
2015
- 2015-08-25 CN CN201510526759.8A patent/CN105161799B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101593863A (en) * | 2009-06-26 | 2009-12-02 | 北京信息科技大学 | A kind of adjustable microwave band-pass filter |
| CN103311614A (en) * | 2013-05-09 | 2013-09-18 | 上海海事大学 | Dual-mode micro-band bandpass filter of crossed patch |
| CN103474731A (en) * | 2013-09-05 | 2013-12-25 | 湖北文理学院 | Branch knot loading compact type microstrip filter |
| CN104393378A (en) * | 2014-11-24 | 2015-03-04 | 电子科技大学 | Continuously adjustable band-pass filter based on nematic liquid crystal |
| CN104466307A (en) * | 2014-11-24 | 2015-03-25 | 电子科技大学 | Phase shifter |
| CN204905393U (en) * | 2015-08-25 | 2015-12-23 | 电子科技大学 | Microwave tunable filter |
Non-Patent Citations (2)
| Title |
|---|
| LEI ZHU: "Miniaturized Dual-Mode Bandpass Filter Using Inductively Loaded Cross-Slotted Patch Resonator", 《IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS》 * |
| N. MARTIN: "Electrically Microwave Tunable Components Using Liquid Crystals", 《2002 32ND EUROPEAN MICROWAVE CONFERENCE》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112105144A (en) * | 2020-11-17 | 2020-12-18 | 南京天朗防务科技有限公司 | Circuit board structure and using method thereof |
| CN112105144B (en) * | 2020-11-17 | 2021-02-05 | 南京天朗防务科技有限公司 | Circuit board structure and using method thereof |
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| Publication number | Publication date |
|---|---|
| CN105161799B (en) | 2019-04-09 |
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Granted publication date: 20190409 Termination date: 20190825 |