CN105742774A - X-waveband narrow-band band-pass filter - Google Patents
X-waveband narrow-band band-pass filter Download PDFInfo
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- CN105742774A CN105742774A CN201610197388.8A CN201610197388A CN105742774A CN 105742774 A CN105742774 A CN 105742774A CN 201610197388 A CN201610197388 A CN 201610197388A CN 105742774 A CN105742774 A CN 105742774A
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- band
- printed board
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- resonator
- wave
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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
- H01P1/212—Frequency-selective devices, e.g. filters suppressing or attenuating harmonic frequencies
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Abstract
The invention discloses an X-waveband narrow-band band-pass filter. The band-pass filter comprises a printed board, and copper-coated layers arranged on the upper and lower surfaces of the printed board; the copper-coated layers on the upper surface of the printed board are symmetrical left to right; the printed board comprises two 1/2-wavelength single-mode resonators, wherein a gap is formed between the two single-mode resonators; a dual-mode resonator is arranged under the middle of the two single-mode resonators; a 1/4-wavelenth feeder line is arranged on the end part of the side edge, close to the printed board, of each single-mode resonator separately; and when the two single-mode resonators are coupled with the dual-mode resonator, crossed coupling is formed between the two single-mode resonators so as to form multiple transmission zero points around the passband of the filter. Due to the multiple transmission zero points, the selectivity and upper sideband harmonic suppression of the filter can be improved greatly, so that the filter obtains narrow band performance, high upper sideband suppression degree and high selectivity.
Description
Technical field
The present invention relates to the radar system of wireless communication field, be specifically related to a kind of X-band narrow band filter.
Background technology
In wireless communication system or radar system, native system can be produced interference by the other system being operated in successive bands, other system also can be produced interference by the leakage signal of native system simultaneously, or even in same system, useful signal is also had interference by the leakage signal produced in conversion process, in order to filter these interference signals, it is necessary to use high selective band filter, these wave filter make system external circle or internal noise signal have immunocompetence.It addition, the size reducing individual devices as far as possible can reduce the size of system, for passive filter, small size, low cost and high-performance are following development trends.Recent years, there is high upper side band degree of suppression, the selective X-band narrow band filter of altofrequency is widely studied.
Traditional has high upper side band degree of suppression, the multiple single mode microstrip transmission line resonant element cross-couplings of altofrequency selective X-band narrow band filter or introduces the scheme realizations such as radiation branch nodel line, it is necessary for increasing filter order for reaching high performance index request, namely need to use multiple resonant element, or introduce many radiation branch nodel lines, filter size thus can be made bigger, the difficulty of processing also can increase accordingly, is unfavorable for the Miniaturization Design of system.
Summary of the invention
For above-mentioned deficiency of the prior art, X-band narrow band filter provided by the invention improves the frequency selectivity of wave filter by the multiple transmission zeros arranged, and improves upper side band degree of suppression.
In order to reach foregoing invention purpose, the technical solution used in the present invention is:
Thering is provided a kind of X-band narrow band filter, it includes printed board and the copper plate of printed board upper and lower surface setting；The copper plate of printed board upper surface is symmetrical, it singlemode resonance device including having 1/2nd wavelength in a gap between two, the centre immediately below two singlemode resonance devices is provided with the end of double-mold resonator and the contiguous printed board side of each singlemode resonance device and is provided with a quarter-wave feeder line；When two singlemode resonance devices produce to couple with dual-mode resonator, between two singlemode resonance devices, form cross-couplings, form multiple transmission zero with the near pass-band at wave filter.
The invention have the benefit that when two singlemode resonance devices produce to couple with dual-mode resonator, cross-couplings is formed between two singlemode resonance devices, multiple transmission zero is formed with the near pass-band at wave filter, the existence of multiple transmission zeros, can high degree improve wave filter selectivity and suppress upper side band harmonic wave so that wave filter has high upper side band degree of suppression, high selectivity while having narrowband performance.
Accompanying drawing explanation
Fig. 1 is the structural representation of X-band narrow band filter.
Fig. 2 is the coupling topology structure chart of X-band narrow band filter.
Fig. 3 is the curve chart of the X-band narrow band filter simulation result when arrowband and test result.
Fig. 4 is the curve chart of the X-band narrow band filter simulation result when broadband and test result.
Wherein, 1, singlemode resonance device；2, feeder line；3, dual-mode resonator；4, wiring board.
Detailed description of the invention
Below the specific embodiment of the present invention is described; so that those skilled in the art understand the present invention; it is to be understood that; the invention is not restricted to the scope of detailed description of the invention; to those skilled in the art; as long as various changes limit and in the spirit and scope of the present invention determined, these changes are apparent from, and all utilize the innovation and creation of present inventive concept all at the row of protection in appended claim.
The structural representation of X-band narrow band filter is illustrated with reference to Fig. 1, Fig. 1；As it is shown in figure 1, this X-band narrow band filter includes printed board and the copper plate of printed board upper and lower surface setting；During use, the thickness of printed board therein is 0.254mm, and the thickness of the copper plate that printed board upper and lower surface is arranged is 0.018mm.
Refer again to Fig. 1, the copper plate of printed board upper surface is symmetrical, it singlemode resonance device including having 1/2nd wavelength in a gap between two, the centre immediately below two singlemode resonance devices is provided with the end of double-mold resonator and the contiguous printed board side of each singlemode resonance device and is provided with a quarter-wave feeder line；When two singlemode resonance devices produce to couple with dual-mode resonator, cross-couplings is formed between two singlemode resonance devices, multiple transmission zero is formed with the near pass-band at wave filter, the existence of multiple transmission zeros, can high degree improve wave filter selectivity and suppress upper side band harmonic wave so that wave filter has high upper side band degree of suppression, high selectivity while having narrowband performance.
The singlemode resonance device of two 1/2nd wavelength therein is two 1/2nd wavelength uniform impedance resonator (UIR) actually；Article two, feeder line is all trapezoidal, adopts trapezoidal transition structure can be effectively improved the return loss in wave filter.
The coupling topology structure chart of X-band narrow band filter is illustrated with reference to Fig. 2, Fig. 2；Dual-mode resonator can be equivalent to a long electric impedance resonator of all-wave (being preferably the long step impedance resonator of all-wave) and a half-wavelength electric impedance resonator, as shown in Figure 2, sequence number 2 therein is a half-wavelength electric impedance resonator (UIR), sequence number 3 is the long step impedance resonator of an all-wave (SIR), sequence number 1 and 4 respectively singlemode resonance device, S and L is two feeder lines respectively.So, one of them electric impedance resonator and two singlemode resonance devices produce a transmission zero (transmission zero that the path 1-2-4-1 in Fig. 2 produces) at wave filter upper side band, another electric impedance resonator and two singlemode resonance devices produce a transmission zero (transmission zero that the path 1-3-4-1 in Fig. 2 produces) at wave filter lower sideband, and two equivalent electric impedance resonators produce a transmission zero (transmission node that the path 2-3 in Fig. 2 produces) at wave filter upper side band.
Two singlemode resonance devices all take the shape of the letter U, and opening between the two is oppositely arranged；Dual-mode resonator is I-shaped.Owing to the singlemode resonance device of this programme and the profile of dual-mode resonator all adopt the pattern of bending fold, this wave filter can be made to adopt less resonator, thus the size of wave filter can reduce significantly, the length and width of wave filter generally can accomplish 18.5mm × 9.8mm.
The property indices of the wave filter that this programme designs is illustrated by the curve chart of the X-band narrow band filter illustrated below in conjunction with curve chart and Fig. 4 of Fig. 3 X-band narrow band filter illustrated simulation result when arrowband and the test result simulation result when broadband and test result, as shown in table 1:
Table 1
| Performance | Performance indications |
| Mid frequency | 10.05GHz |
| Free transmission range | 9.88GHz–10.22GHz |
| Relative bandwidth | 3.24% |
| Insertion loss | 3.8dB |
| Upper side band degree of suppression | >20dB10.3GHz–27GHz |
| Double-side band selectivity | 25dB gradient slope value=1.67 |
| Filter size | 18.5mm×9.8mm |
S11 in Fig. 3 and Fig. 4 is return loss, and S21 is insertion loss, and the performance of band filter is together decided on by return loss and insertion loss；As can be drawn from Table 1, this programme design wave filter can high degree improve wave filter selectivity and suppress upper side band harmonic wave so that wave filter has high upper side band degree of suppression, high selectivity while having narrowband performance.
Claims (5)
1.X wave band narrow band filter, including the copper plate that printed board and described printed board upper and lower surface are arranged；It is characterized in that, the copper plate of described printed board upper surface is symmetrical, it singlemode resonance device including having 1/2nd wavelength in a gap between two, the centre immediately below two singlemode resonance devices is provided with the end of a dual-mode resonator and the contiguous printed board side of each singlemode resonance device and is provided with a quarter-wave feeder line；When two described singlemode resonance devices produce to couple with dual-mode resonator, between two singlemode resonance devices, form cross-couplings, form multiple transmission zero with the near pass-band at wave filter.
2. X-band narrow band filter according to claim 1, it is characterized in that, described dual-mode resonator is equivalent to two electric impedance resonators, a respectively half-wavelength electric impedance resonator and a long electric impedance resonator of all-wave, one of them electric impedance resonator and two singlemode resonance devices produce a transmission zero at wave filter upper side band, another electric impedance resonator and two singlemode resonance devices produce a transmission zero at wave filter lower sideband, and two equivalent electric impedance resonators produce a transmission zero at wave filter upper side band.
3. X-band narrow band filter according to claim 1 and 2, it is characterised in that two described feeder lines are all trapezoidal.
4. X-band narrow band filter according to claim 1 and 2, it is characterised in that two described singlemode resonance devices all take the shape of the letter U, and opening between the two is oppositely arranged；Described dual-mode resonator is I-shaped.
5. X-band narrow band filter according to claim 4, it is characterised in that the length and width of this wave filter are 18.5mm × 9.8mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610197388.8A CN105742774A (en) | 2016-03-31 | 2016-03-31 | X-waveband narrow-band band-pass filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610197388.8A CN105742774A (en) | 2016-03-31 | 2016-03-31 | X-waveband narrow-band band-pass filter |
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| Publication Number | Publication Date |
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| CN105742774A true CN105742774A (en) | 2016-07-06 |
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| CN201610197388.8A Pending CN105742774A (en) | 2016-03-31 | 2016-03-31 | X-waveband narrow-band band-pass filter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108493543A (en) * | 2018-04-19 | 2018-09-04 | 超视距成都科技有限责任公司 | Source based on load open circuit minor matters line loads coupled differential filter |
| CN108539335A (en) * | 2018-04-19 | 2018-09-14 | 超视距成都科技有限责任公司 | Source based on load open circuit minor matters line loads coupling filter |
| CN116259938A (en) * | 2022-11-25 | 2023-06-13 | 中国人民解放军战略支援部队信息工程大学 | Miniaturized box-type coupling topological structure plane microstrip filter |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103579723A (en) * | 2013-11-08 | 2014-02-12 | 东南大学 | High-selectivity bandpass filter based on I-shaped dual-mode resonator |
-
2016
- 2016-03-31 CN CN201610197388.8A patent/CN105742774A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103579723A (en) * | 2013-11-08 | 2014-02-12 | 东南大学 | High-selectivity bandpass filter based on I-shaped dual-mode resonator |
Non-Patent Citations (1)
| Title |
|---|
| YANG YUAN 等: ""A Narrowband Bandpass Filter with Wide Upper Stopband and High Frequency Selectivity"", 《2015 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATION PROBLEM-SOLVING (ICCP)》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108493543A (en) * | 2018-04-19 | 2018-09-04 | 超视距成都科技有限责任公司 | Source based on load open circuit minor matters line loads coupled differential filter |
| CN108539335A (en) * | 2018-04-19 | 2018-09-14 | 超视距成都科技有限责任公司 | Source based on load open circuit minor matters line loads coupling filter |
| CN116259938A (en) * | 2022-11-25 | 2023-06-13 | 中国人民解放军战略支援部队信息工程大学 | Miniaturized box-type coupling topological structure plane microstrip filter |
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Application publication date: 20160706 |