CN100499257C - Method for providing ability of tuning resonance frequency for different applications - Google Patents
Method for providing ability of tuning resonance frequency for different applications Download PDFInfo
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- CN100499257C CN100499257C CNB2004800430860A CN200480043086A CN100499257C CN 100499257 C CN100499257 C CN 100499257C CN B2004800430860 A CNB2004800430860 A CN B2004800430860A CN 200480043086 A CN200480043086 A CN 200480043086A CN 100499257 C CN100499257 C CN 100499257C
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- resonator
- recess
- wire chamber
- resonance frequency
- ferroelectric
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
- H01P1/2084—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with dielectric resonators
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Abstract
Disclosed is a method for providing ability of tuning resonance frequency in different applications. The method according to the invention at least comprises the step of adding ferroelectric disks in the resonators. Here, the ferroelectric disks have the relative dielectric constants varying according to change of ambient environment. In the invention, since the resonance frequency can vary according to the ambient environment, the tuning range of filters and duplexers/multiplexers having the resonators with ferroelectric disks is large. In addition, the resonance frequency can be changed in high frequency environment according to the invention. So, the invention can be used to improve the size and cost of the filters and duplexers/multiplexers in different applications, especially in low noise environment.
Description
Technical field
The present invention relates generally to the frequency tuning technology, is specifically related to a kind of method that the ability of tuning resonance frequency is provided in different application.
Background technology
At present, resonator is widely used in filter and duplex/multiplexer, especially filter.Good filter possesses three required features, inserts promptly that loss is low, return loss is high, rejection band is high.For example, a high-quality filter can improve 3dB with channel quality, and this will make data transmission bauds double than original transmission speed.For the service provider, this will increase the area that the user can enjoy " optimum position " of maximum speed connection, and will improve the Mean Speed that data are transmitted in network.
Use multiple technologies such as cavity resonator, multiple coupled chamber, dielectric resonator to realize low insertion loss now, and use multimode resonator to realize small size.Sometimes also need to obtain more excellent filter transfer function by the coupling between two non-conterminous resonators.
Be designed to example with the quadravalence dielectric resonator, this design has comprised the single capacitor cross-couplings.It will be appreciated, of course, that similarly and also can realize inductance coupling high.This filter adopts short single-stage evanescent mode filter that first and last resonator are coupled together.Coupling between other resonators can be by tuning, but cured of the induction of resonance is not by tuning.The evanescent mode filter of first and last resonator of being coupled adopts the recess of coaxial line to assign to provide the electric capacity that needs, and makes that in fact the shunt inductance of equal value by the low barrier portion of the waveguide of cured representative produces resonance.
Provide the single cross fork coupling of quadravalence dielectric resonator a pair of transmission zero, this transmission zero have increased the weight of near the decay the passband.Capacitive coupling and inductance coupling high all produce response as depicted in figs. 1 and 2.Fig. 1 and Fig. 2 be corresponding UMTS RX and TX frequency band respectively, comprises respectively to the influence of stopband attenuation or to the influence of passband group delay and amplitude smoothness.
Along with the development of communications applications, filter and duplex/multiplexer need have different bandwidth and centre frequency at different application.For example, a carrier wave needs the 5MHz bandwidth, and two carrier waves need the 10MHz bandwidth.Yet in the prior art, the tuning common employing variable capacitance diode of resonance frequency is realized.There are several problems in this technical scheme.At first, its tuning range is little, can not satisfy the needs of more application, and for example, this method can not obtain the required 60MHz bandwidth of Wideband Code Division Multiple Access (WCDMA) (WCDMA) system.Secondly, centre frequency is not high, and this also is unfavorable for the development of resonator.All these drawbacks limit the development of filter and duplex/multiplexer.
Summary of the invention
Therefore, in order to overcome shortcoming of the prior art, an object of the present invention is to provide a kind of method that the ability of tuning resonance frequency is provided in different application.
A method according to the present present invention comprises: increase ferroelectric dish in dielectric resonator, wherein ferroelectric dish has the relative dielectric constant that the variation according to surrounding environment changes; On described dielectric resonator, form recess, with two polarization states of each pattern of motivating on the couplant resonator.
In said method, described dielectric resonator is positioned at the tubular wire chamber of four utmost point filters that have two I/O coaxial probes.The face of crossing this recess and wire chamber central axis can become 135 degree angles with the face of crossing probe and wire chamber central axis.
Said method may further include and form another recess respectively on each resonator, to proofread and correct the disturbance that causes owing to coaxial probe.The face of crossing this another recess and wire chamber central axis with cross probe and wire chamber in the face of bobbin thread can become an angle of 90 degrees.
In said method, described dielectric resonator can also be arranged in duplex or multiplex machine.
In said method, recess can be rectangle or circle.
This method may further include the step of using full electromagnetic simulator optimization response.
In said method, surrounding environment comprises external dc biasing electric field and environment temperature.
From the method according to this invention as can be seen, by increase ferroelectric dish in resonator, resonance frequency can change according to surrounding environment, for example, resonance frequency can be used as the function of applying direct current electric field and environment temperature and changes, so tuning range is big compared to existing technology a lot.In addition, according to the present invention, resonance frequency can change in high frequency environment.For the filter that has resonator in the high frequency environment, it is a passive component.When at particular centre frequency and the bandwidth Design filter determined, this filter in use should always have identical bandwidth and identical centre frequency.In the prior art, but if require identical bandwidth different centre frequencies, this filter just must redesign.But in the present invention, because centre frequency can change in high frequency environment, change centre frequency and obtain new filter and just be easy to, and also need cost hardly.Therefore, the present invention is used in size and the cost that improves filter and duplex/multiplexer in the low noise environment.
Description of drawings
From following detailed description with the accompanying drawing, above-mentioned and other purpose of the present invention, feature and advantage will be more obvious, in these accompanying drawings:
Fig. 1 shows the UMTX RX frequency response that uses capacity coupled four utmost point filters;
Fig. 2 shows the UMTX RX frequency response of four utmost point filters that use inductance coupling high;
Fig. 3 is general flow chart according to the preferred embodiment of the invention; With
Fig. 4 shows the design of the electricity-tunable filter with ferroelectric dish of the present invention's proposition.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described.In the following description, influence clarity of the present invention for fear of unnecessary details, some well-known functions or structure will not be described in detail.
Thinking of the present invention is to increase ferroelectric dish in resonator.Owing to the dielectric constant of the ferroelectric dish function as external dc (DC) electric field and temperature changes, so this dielectric constant is not a fixed value, and can be according to surrounding environment change.Therefore, resonance frequency also can change, and this just makes the centre frequency of filter, duplex/multiplexer change.Simultaneously, can obtain bigger tuning range.
With reference to the Fig. 3 that wherein shows general flow chart, and be example, may further comprise the steps according to the method for this embodiment with four utmost point filters of forming by two tubular wire chambers that loaded two dielectric resonators that are supported (DR).
In step 301, in the resonator of filter, add ferroelectric dish.
In this example, in two dielectric resonators, add ferroelectric dish respectively.Shown in Figure 4 as the design that wherein shows the electricity-tunable filter with ferroelectric dish that the present invention proposes, these two dielectric resonators are arranged along the axis of tubular wire chamber.
Environment temperature (K) can change the dielectric constant of ferroelectric dish, and formula is as follows:
Here, M equals 9 * 10
4K, T
0Equal 38K, T
1Equal 84K.
In addition, external dc biasing electric field (kV/cm) also may change the dielectric constant of ferroelectric dish, and formula is as follows:
ε(E)＝-429E
2+12992
Has nonlinear characteristic from the ferroelectric as can be seen dish of above two formula.This specific character can be used for development temperature compensate for variable phase shifter or sef-adapting filter.For the electric tunable microwave equipment in the lower noise environment, the nonlinear application that exploitation has the ferroelectric material of conduction surfaces will have very big potentiality, and this Design of Filter for example as shown in Figure 4.
In step 302, on each dielectric resonator, form a rectangular recess, this recess becomes 135 degree angles with probe.
Filter shown in Figure 4 is encouraged by two I/O coaxial probes.The dielectric resonator that has recess is energized out first and mixes HEM
11 △Bimodulus.Two polarization states of each pattern are by a rectangular recess coupling on the dielectric resonator, and wherein this recess becomes 135 degree angles with probe.Cured coupling of rectangle by intersecting between the chamber.
In step 303, on each dielectric resonator, form another rectangular recess, this recess becomes an angle of 90 degrees with probe.
In order to proofread and correct the disturbance that causes by coaxial probe, form the rectangular recess that becomes an angle of 90 degrees with probe at each dielectric resonator.
In step 304, utilize full electromagnetic simulator to optimize filter response.
Here propose a kind of filter synthetic method, can be used to design filter as shown in Figure 4.Can utilize full electromagnetic simulator to optimize filter response, make centre frequency equal 2GHz, the bandwidth when-3dB is 0.25% (5MHz) of centre frequency, is 3% (60MHz) of centre frequency for the tuning capability of UMTS frequency band.
Can be for 5MHz (carrier wave), 10MHz (two carrier waves), 15MHz (three carrier waves) design structure shown in Figure 4, reducing size and to reduce cost, and, this structure can by change the Dc bias electric field be tuned to whole UMTS frequency band.And the 60MHz design also can be tuned to wireless multi-band, to be applicable to soft radio applications.
Except above-mentioned application, the present invention can also be used for the tuning equipment of requirement low noise.Full electromagnetic simulator can also be optimized filter response, makes centre frequency equal main radio band; Be the quantity of the carrier wave considered in the bandwidth of-3dB, and soft radio applications has covered the tuning capability of all radio band.
The dielectric constant of ferroelectric dish changes as the function of frequency, thereby makes the microwave equipment such as variable phase shifter or sef-adapting filter can be used for high frequency environment.In addition, dielectric constant changes as the function of applying direct current electric field and temperature, uses thereby make microwave equipment such as the phase shifter of electric tunable and temperature-compensating and filter can be used for low noise.
It will be understood by those skilled in the art that the recess that forms in step 302 and 303 except above-mentioned rectangular shape, can also be circular or other shapes.
The present invention is that example is illustrated with the filter.But be further appreciated that the present invention can also be used for duplex/multiplexer.
Therefore,, can be expressly understood that above-mentioned explanation is as just showing and example, rather than be used to limit the present invention although the present invention is described in detail and illustrates.Spirit of the present invention and protection range are only by the claim limit in claims.
Claims (9)
1, a kind of method that the ability of tuning resonance frequency is provided in different application is characterized in that, described method comprises at least:
Increase ferroelectric dish in dielectric resonator, wherein said ferroelectric dish has the relative dielectric constant that the variation according to surrounding environment changes;
On described dielectric resonator, form recess, with two polarization states of each pattern of motivating on the couplant resonator.
2, method according to claim 1 is characterized in that, described dielectric resonator is positioned at the tubular wire chamber of four utmost point filters that have two I/O coaxial probes.
3, method according to claim 2 is characterized in that, the face of crossing described recess and wire chamber central axis becomes 135 degree angles with the face of crossing probe and wire chamber central axis.
4, method according to claim 2 is characterized in that, described method further comprises: form another recess respectively on each resonator, to proofread and correct the disturbance that causes owing to coaxial probe.
5, method according to claim 4 is characterized in that, the face of crossing described another recess and wire chamber central axis becomes an angle of 90 degrees with the face of crossing probe and wire chamber central axis.
6, the method for claim 1 is characterized in that, described dielectric resonator is arranged in duplex or multiplex machine.
7, according to any described method in the claim 1 to 6, it is characterized in that described recess is rectangle or circle.
8, method according to claim 1 is characterized in that, described method further comprises: use full electromagnetic simulator to optimize response.
9, method according to claim 1 is characterized in that, wherein said surrounding environment comprises external dc biasing electric field and environment temperature.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2004/000231 WO2005091429A1 (en) | 2004-03-19 | 2004-03-19 | A method for providing ability of tuning resonance frequency for different applications |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1957501A CN1957501A (en) | 2007-05-02 |
| CN100499257C true CN100499257C (en) | 2009-06-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800430860A Expired - Fee Related CN100499257C (en) | 2004-03-19 | 2004-03-19 | Method for providing ability of tuning resonance frequency for different applications |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN100499257C (en) |
| WO (1) | WO2005091429A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110416681B (en) * | 2019-08-01 | 2021-02-26 | 电子科技大学 | Broadband adaptive adjusting device and method for resonant cavity coupling quantity |
| CN112835130B (en) * | 2020-12-29 | 2022-06-28 | 北京邮电大学 | Weather state detection method and device and electronic equipment |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5459123A (en) * | 1994-04-08 | 1995-10-17 | Das; Satyendranath | Ferroelectric electronically tunable filters |
| US5496796A (en) * | 1994-09-20 | 1996-03-05 | Das; Satyendranath | High Tc superconducting band reject ferroelectric filter (TFF) |
| GB2380069B (en) * | 2001-04-09 | 2005-04-20 | South Bank Univ Entpr Ltd | Tuneable dielectric resonator |
| CA2461886A1 (en) * | 2001-09-27 | 2003-04-03 | Qualcomm Incorporated | Electrically tunable bandpass filters |
-
2004
- 2004-03-19 WO PCT/CN2004/000231 patent/WO2005091429A1/en active Application Filing
- 2004-03-19 CN CNB2004800430860A patent/CN100499257C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| WO2005091429A1 (en) | 2005-09-29 |
| CN1957501A (en) | 2007-05-02 |
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