CN104953982A - Method for improving coaxial-cavity dielectric oscillator - Google Patents
Method for improving coaxial-cavity dielectric oscillator Download PDFInfo
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- CN104953982A CN104953982A CN201510443929.6A CN201510443929A CN104953982A CN 104953982 A CN104953982 A CN 104953982A CN 201510443929 A CN201510443929 A CN 201510443929A CN 104953982 A CN104953982 A CN 104953982A
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Abstract
The invention discloses a method for improving a coaxial-cavity dielectric oscillator. The method is characterized by comprising the following steps: reducing the output frequency of the coaxial-cavity dielectric oscillator to the half in a normal state; accessing the reduced output frequency to a high-pass filter and selecting second harmonics of the reduced output frequency; increasing the length of a resonator by three times than a quarter wavelength mode. The method has the advantages that the adjustment is more convenient and the operability is higher; the frequency variation is small, so that the difficulty in circuit debugging is greatly reduced.
Description
Technical field
The present invention relates to coaxial cavity dielectric oscillator, particularly the improving one's methods of a kind of coaxial cavity dielectric oscillator.
Background technology
Microwave oscillator is one of vitals be widely used in the various microwave systems such as communication, radar, electronic countermeasures and tester, and its performance quality will directly affect quality and the certainty of measurement of microwave system.
By the contour structures of resonator used, microwave dielectric oscillator can be divided into coaxial cavity dielectric oscillator and cylinder shape medium oscillator.Cylindrical dielectric resonator sticks with glue and connects on circuit boards, passes in time, there is the risk of glue ageing failure.Different with cylindrical dielectric resonator, coaxial cavity dielectric resonator directly welds on circuit boards, and install reliable, shock strength is large.
The resonance frequency working in the coaxial cavity dielectric resonator of TEM pattern is relevant with dielectric constant with its overall dimension, dielectric constant mainly contains 21,37,90 3 kind.Under identical operating frequency and wavelength mode, dielectric constant is larger, and size is less.For reaching required operating frequency, regulated by the length changing resonator.But for the oscillator of 14.5GHz, be difficult to use the resonator of quarter-wave long pattern directly in required frequency starting of oscillation, debug difficulties.
For the problems referred to above, provide a kind of novel improving one's methods for 14.5G coaxial cavity dielectric oscillator, reduce debugging difficulty, improve operability.
Summary of the invention
Technical problem to be solved by this invention is, provides improving one's methods of a kind of coaxial cavity dielectric oscillator, reduces debugging difficulty, improves operability.
For achieving the above object, the present invention is directed to 14.5G coaxial cavity dielectric oscillator and a kind of novel scheme is provided, improving one's methods of a kind of coaxial cavity dielectric oscillator, it is characterized in that: described output frequency of improving one's methods as oscillator reduces to the half under normal condition, output frequency access high pass filter, gets its second harmonic; The comparable quarter-wave long pattern of resonator length improves three times.
The output frequency of described oscillator is 7.25GHz.
Described resonator length is 6.9mm.
The circuit board of described coaxial cavity dielectric oscillator adopts Rogers 5880 sheet material, and direct soldering is on cavity.
Described coaxial cavity dielectric resonator connects microwave triode VT and forms negative resistance device, and direct current signal is converted to microwave signal.
Improving one's methods of a kind of coaxial cavity dielectric oscillator, owing to adopting above-mentioned method, advantage adjustment of the present invention is more convenient, and operability is stronger; Frequency variation is little, greatly reduces the difficulty of circuit debugging.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation;
Fig. 1 is the circuit diagram of improving one's methods of a kind of coaxial cavity dielectric oscillator of the present invention.
Embodiment
For the coaxial cavity dielectric oscillator of quarter-wave long pattern, dielectric constant is the resonator of 21, and the relation of length and resonance frequency is as follows:
L＝16.37/F (1)
Wherein, L is the length of coaxial cavity dielectric resonator, and the resonance frequency of unit to be mm, F be coaxial cavity dielectric resonator, unit is GHz.For the oscillator of 14.5GHz, be difficult to use the resonator of quarter-wave long pattern directly in required frequency starting of oscillation.
So as shown in Figure 1, the present invention reduces the output frequency of oscillator, makes coaxial cavity dielectric resonator be operated in four/three-wavelength pattern.And make coaxial cavity dielectric oscillator be operated in Ku wave band, the invention provides a kind of operability and practical method, it weakens the inferior position of coaxial cavity dielectric resonator operating frequency lower than 6GHz, improves the output frequency of coaxial cavity dielectric oscillator.
The final output frequency of oscillator is 14.5GHz, by reducing output frequency, allows oscillator first-harmonic export as 7.25GHz, after connect high pass filter, get its second harmonic.Coaxial cavity dielectric oscillator is made up of coaxial cavity dielectric resonator CR, microwave triode VT, variable capacitance diode VD, resistance R1, R2, R3, electric capacity C1, C2, C3.VC connects D.C. regulated power supply, and Vt connects variable voltage, and RFout connects external circuit.
From formula (1), the length of required coaxial cavity dielectric resonator is about 2.3mm.Meanwhile, make coaxial cavity dielectric resonator be operated in four/three-wavelength pattern, the comparable quarter-wave long pattern of resonator length improves three times, i.e. about 6.9mm.For identical error in length, the coaxial cavity relative error that size is large is little, adjusts more convenient, and operability is stronger, and the frequency variation caused thus is little, greatly reduces the difficulty of circuit debugging.
Adopt the 14.5G coaxial cavity dielectric oscillator of four/three-wavelength Model Design, whole circuit adopts Rogers 5880 sheet material, direct soldering on cavity, compact conformation.Within the scope of tuning terminal voltage 0 ~ 5V, output frequency change 35M, phase noise during free oscillation is:
-75dBc/Hz@10kHz，-97dBc/Hz@100kHz，-137dBc/Hz@1MHz。
Above by reference to the accompanying drawings to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the various improvement that technical solution of the present invention is carried out, or directly apply to other occasion, all within protection scope of the present invention without improving.
Claims (5)
1. the improving one's methods of a coaxial cavity dielectric oscillator, is characterized in that: described output frequency of improving one's methods as oscillator is set to that to reduce under normal condition general, and output frequency access high pass filter, gets its second harmonic; The comparable quarter-wave long pattern of resonator length improves three times.
2. the improving one's methods of a kind of coaxial cavity dielectric oscillator according to claim 1, is characterized in that: the output frequency of described oscillator is 7.25GHz.
3. the improving one's methods of a kind of coaxial cavity dielectric oscillator according to claim 1, is characterized in that: described resonator length is 6.9mm.
4. the improving one's methods of a kind of coaxial cavity dielectric oscillator according to claim 1, is characterized in that: the circuit board of described coaxial cavity dielectric oscillator adopts Rogers 5880 sheet material, and direct soldering is on cavity.
5. the improving one's methods of a kind of coaxial cavity dielectric oscillator according to claim 1, is characterized in that: described coaxial cavity dielectric resonator connects microwave triode VT and forms negative resistance device, and direct current signal is converted to microwave signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510443929.6A CN104953982A (en) | 2015-07-23 | 2015-07-23 | Method for improving coaxial-cavity dielectric oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510443929.6A CN104953982A (en) | 2015-07-23 | 2015-07-23 | Method for improving coaxial-cavity dielectric oscillator |
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| Publication Number | Publication Date |
|---|---|
| CN104953982A true CN104953982A (en) | 2015-09-30 |
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| CN201510443929.6A Pending CN104953982A (en) | 2015-07-23 | 2015-07-23 | Method for improving coaxial-cavity dielectric oscillator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109714052A (en) * | 2018-12-19 | 2019-05-03 | 安徽华东光电技术研究所有限公司 | X-band coaxial dielectric frequency source |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86105652A (en) * | 1985-07-23 | 1987-01-21 | 日本电气株式会社 | Oscillator with dielectric resonant chamber control of high frequency doubling efficiency |
| CN1723607A (en) * | 2002-12-11 | 2006-01-18 | 皇家飞利浦电子股份有限公司 | An oscillator circuit for generating a high-frequency electromagnetic oscillation |
-
2015
- 2015-07-23 CN CN201510443929.6A patent/CN104953982A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86105652A (en) * | 1985-07-23 | 1987-01-21 | 日本电气株式会社 | Oscillator with dielectric resonant chamber control of high frequency doubling efficiency |
| CN1723607A (en) * | 2002-12-11 | 2006-01-18 | 皇家飞利浦电子股份有限公司 | An oscillator circuit for generating a high-frequency electromagnetic oscillation |
Non-Patent Citations (2)
| Title |
|---|
| 杜倚诚: "K波段介质振荡锁相源", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
| 杨温渊: "同轴反射三极管振荡器的数值模拟", 《强激光与粒子束》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109714052A (en) * | 2018-12-19 | 2019-05-03 | 安徽华东光电技术研究所有限公司 | X-band coaxial dielectric frequency source |
| CN109714052B (en) * | 2018-12-19 | 2023-04-11 | 安徽华东光电技术研究所有限公司 | X-waveband coaxial medium frequency source |
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Application publication date: 20150930 |