CN100511830C - Substrate integrated waveguide subharmonic upper frequency changer - Google Patents
Substrate integrated waveguide subharmonic upper frequency changer Download PDFInfo
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- CN100511830C CN100511830C CNB2006100384971A CN200610038497A CN100511830C CN 100511830 C CN100511830 C CN 100511830C CN B2006100384971 A CNB2006100384971 A CN B2006100384971A CN 200610038497 A CN200610038497 A CN 200610038497A CN 100511830 C CN100511830 C CN 100511830C
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Abstract
This invention discloses a converter used in chip integrated waveguide subharmonics of a microwave and millimeter wave circuit including a medium chip with IF signal transmission line connected with an open circuit branch, a converter of microstrip and chip integrated waveguide is set at the connection place, a local signal transmission line is set on the chip and connected with a short circuit branch, a parallel diode pair is connected between the connection central point of the IF signal transmission line and a quarter local wave length open circuit branch and that of the local signal transmission line and a half RF wavelength short circuit branch, a chip integrated waveguide is connected on the converter of the microstrip and the integrated waveguide, a converter of a chip integrated waveguide and microstrip is connected on the other end of the waveguide composed of two rows of metal through holes set on the medium chip with metallic pastes at both sides and discontinuous eliminating holes are set at the corner of the waveguide.
Description
Technical field
The present invention relates to a kind of microwave and millimeter wave subharmonic upper frequency changer, relate in particular to a kind of substrate integrated waveguide subharmonic upper frequency changer that can be used for the microwave and millimeter wave circuit design.
Background technology
The microwave subharmonic upper frequency changer has obtained a large amount of application in the microwave and millimeter wave radio system, it is critical component of sender, with the intermediate-freuqncy signal up-conversion to the microwave and millimeter wave signal, so that it is at spatial transmission; Because its harmonic wave and intermediate-freuqncy signal mixing mutually with local oscillation signal, so its frequency that can work is very high, is suitable for the low cost design of microwave and millimeter wave.Owing to be harmonic mixing, traditional subharmonic upper frequency changer is difficult to filtering and leaks to the local oscillation signal of radio frequency and the radio frequency low-side image signal with respect to the secondary local oscillator.Transfer to like this in the signal of radio frequency and comprise many more superpower clutters, will make the radiofrequency signal degradation that radiate, the quality of influence communication.Therefore, need to propose the new type of microwave subharmonic upper frequency changer, to reduce noise jamming.
Summary of the invention
The invention provides a kind of effective substrate integrated waveguide subharmonic upper frequency changer that can improve radiofrequency signal quality, clutter filtering.
The present invention adopts following technical scheme:
A kind of substrate integrated waveguide subharmonic upper frequency changer that is used for the microwave and millimeter wave circuit, comprise dielectric substrate I, on dielectric substrate I, be provided with the intermediate-freuqncy signal transmission line that is used to import intermediate-freuqncy signal, on the intermediate-freuqncy signal transmission line, be connected with the open circuit branch of 1/4th local oscillator wavelength, junction in the open circuit branch of intermediate-freuqncy signal transmission line and 1/4th local oscillator wavelength is connected with little band and substrate integration wave-guide transducer, after handling, the intermediate frequency low pass filter transports to little band and substrate integration wave-guide transducer also being connected with intermediate frequency low pass filter and intermediate-freuqncy signal on the intermediate-freuqncy signal transmission line, on dielectric substrate I, also be provided with the local oscillation signal transmission line that is used to import local oscillation signal, on the local oscillation signal transmission line, be connected with the long short circuit branch of 1/2nd rf waves, at above-mentioned intermediate-freuqncy signal transmission line, the connection central point of 1/4th local oscillator wavelength open branches and local oscillation signal transmission line, it is right to be connected with diode connected in parallel between the connection central point of 1/2nd rf wave length road branches, being connected with substrate integration wave-guide and this substrate integration wave-guide on little band and substrate integration wave-guide transducer is the waveguide that presents bending shape, on the substrate integration wave-guide other end, be connected with the substrate integration wave-guide and the microstrip transitions device that are used to export radiofrequency signal, above-mentioned substrate integration wave-guide constitutes by two row's plated-through holes are set at the two-sided dielectric substrate that is provided with metal patch, is equipped with discontinuity at the turning of substrate integration wave-guide and eliminates the hole.
The present invention has utilized the inherent characteristic that the following signal transmission of certain frequency ends in the substrate integration wave-guide, in order to improve the isolation between radio frequency (RF) and the local oscillator (LO), reduces local oscillator and influence of harmonic thereof.At first on the basis of dielectric substrate, realized substrate integration wave-guide.This waveguide has transmission characteristic and the field distribution similar with the rectangular metal waveguide; According to working frequency range, the size of design substrate integration wave-guide.Design then the subharmonic mixing pipe to and corresponding peripheral match circuit.In the present invention, at the up-conversion signal output, used the substrate integration wave-guide of certain size to be used for filtering local oscillator and clutter; In the design of substrate integration wave-guide, noted the design at folding type wave-guide turning, designed the transformational structure between itself and the microstrip circuit simultaneously, made that the entire circuit coupling is good; Compared with prior art, the present invention has following advantage:
1) this substrate integration wave-guide is easy to integrated in the design of microwave and millimeter wave circuit.This is because this substrate integration wave-guide is realized on dielectric substrate fully, utilizes the dielectric constant of dielectric substrate can regulate the size of this substrate integration wave-guide size easily, thereby realizes preferably and other microwave and millimeter wave circuit integrated;
2) loss is little.This is it and the similar characteristic of common stereo metal waveguide, has higher Q value, lower loss.So compare with microstrip circuit, its Q value is than higher, and loss ratio is lower.
3) the clutter filtering is effective.This is that isolation is very high because substrate integration wave-guide has due to the characteristic of almost completely ending for all signals below the cut-off frequency.The present invention reduces the clutter composition in the emitting radio frequency signal, improves local oscillator inhibition degree, thereby improves the radiofrequency signal quality.Secondly, use this substrate integrated waveguide subharmonic upper frequency changer loss low, frequency conversion performance height.
Description of drawings
Fig. 1 is a structural front view of the present invention.
Fig. 2 is the testing radio frequency spectrogram of local oscillator 4.3GHz, intermediate frequency 1GHz.
Embodiment
A kind of substrate integrated waveguide subharmonic upper frequency changer that is used for the microwave and millimeter wave circuit, comprise dielectric substrate I, on dielectric substrate I, be provided with the intermediate-freuqncy signal transmission line 9 that is used to import intermediate-freuqncy signal, on intermediate-freuqncy signal transmission line 9, be connected with the open circuit branch 3 of 1/4th local oscillator wavelength, junction in the open circuit branch 3 of intermediate-freuqncy signal transmission line 9 and 1/4th local oscillator wavelength is connected with little band and substrate integration wave-guide transducer 6, after handling, intermediate frequency low pass filter 5 transports to little band and substrate integration wave-guide transducer 6 also being connected with intermediate frequency low pass filter 5 and intermediate-freuqncy signal on the intermediate-freuqncy signal transmission line 9, on dielectric substrate I, also be provided with the local oscillation signal transmission line 8 that is used to import local oscillation signal, on local oscillation signal transmission line 8, be connected with the long short circuit branch 4 of 1/2nd rf waves, at above-mentioned intermediate-freuqncy signal transmission line 9, the connection central point of 1/4th local oscillator wavelength open branches 3 and local oscillation signal transmission line 8, be connected with diode connected in parallel to 1a between the connection central point of 1/2nd rf wave length road branches 4,1b, on little band and substrate integration wave-guide transducer 6, be connected with substrate integration wave-guide 2 and this substrate integration wave-guide 2 for presenting the waveguide of bending shape, on substrate integration wave-guide 2 other ends, be connected with the substrate integration wave-guide and the microstrip transitions device 7 that are used to export radiofrequency signal, above-mentioned substrate integration wave-guide 2 constitutes by two row's plated-through holes are set at the two-sided dielectric substrate that is provided with metal patch, is equipped with discontinuity at the turning of substrate integration wave-guide 2 and eliminates hole 10,11.
The present invention has realized the substrate integrated waveguide subharmonic upper frequency changer of above introduction at X-band, and adopting thickness is the dielectric substrate of 0.5mm, and electric relatively dielectric constant is 2.2.The substrate integration wave-guide total length is about 5 wavelength, about about 10cm, considers the cloth version, takes folded form, adds discontinuity around the corner and eliminates hole adjusting standing wave, as shown in Figure 1.Its parameter is: the distance that discontinuity is eliminated center to the substrate integration wave-guide edge in hole is 4.26mm; The diameter that discontinuity is eliminated the hole is 1.5mm.
Below be test result:
Fig. 2 is that local frequency is 4.3GHz, the radio spectrum when IF-FRE is 1GHz, and the radio frequency image frequency at 2 of the 8.6GHz place times of local oscillators and 7.6GHz place almost is suppressed (noise floor that is lower than frequency spectrograph) entirely as can be seen.4.3GHz the local oscillation power of locating is-63.83dBm that corresponding isolation is greater than 70dB.
The present invention has adopted non-linear Schottky diode as nonlinear device as shown in Figure 1.Adopting the long short circuit branch of λ RF/2 at the local oscillator end, is short circuit for radio frequency, but to not influence of local oscillation signal.Similarly, adopt the long open circuit branch of λ LO/4, make diode herein to the local oscillator terminal shortcircuit at radio-frequency head, but to not influence of radiofrequency signal.Intermediate-freuqncy signal is added on the diode pair after by low pass filter.In intermediate frequency port, designed microstrip type step impedance conversion low pass filter, leak into intermediate frequency to prevent radiofrequency signal.Utilize the nonlinear characteristic of diode to produce mf
LO± nf
IFA lot of frequency components, m here, n is an integer, f
LOAnd f
IFBe respectively local oscillator and IF-FRE.The cut-off frequency of substrate integration wave-guide is designed at f
LO-f
IFAnd f
LO+ f
IFBetween, the cut-off characteristics that can utilize substrate integration wave-guide is with f
LO-f
IFAll following frequency components comprise local oscillator and intermediate-freuqncy signal filtering, thereby obtain the radiofrequency signal f after the high-quality up-conversion
RF=f
LO+ f
IF, f here
RFBe radio frequency signal frequency.
The field distribution of substrate integration wave-guide and common metal rectangular waveguide are similar, have a lot of character similar to the common metal waveguide.In the traditional rectangular waveguide, has the character of isolating fully for the electromagnetic wave below the cut-off frequency.Same characteristic also exists in substrate integration wave-guide.
For subharmonic upper frequency changer, main clutter is 2 times of local oscillators, local oscillator and radio frequency image frequency.The operating frequency of high-isolation upconverter can be calculated out by the cut-off frequency of substrate integration wave-guide.With the example that is designed in scheming, for the intermediate frequency of 1GHz, effectively rf frequency is 9.3 ~ 9.8GHz, and corresponding local frequency is 4.15 ~ 4.4GHz, and the clutter main in this frequency range almost is suppressed entirely.For the intermediate frequency of 2GHz, effectively rf frequency is 9.3 ~ 10.8GHz, and local frequency is 3.65 ~ 4.4GHz.Subharmonic upper frequency changer that on this basis can design.
Claims (1)
1, a kind of substrate integrated waveguide subharmonic upper frequency changer that is used for the microwave and millimeter wave circuit, comprise dielectric substrate (I), on dielectric substrate (I), be provided with the intermediate-freuqncy signal transmission line (9) that is used to import intermediate-freuqncy signal, on intermediate-freuqncy signal transmission line (9), be connected with intermediate frequency low pass filter (5) and be connected with the input of intermediate frequency low pass filter (5), on the output of intermediate frequency low pass filter (5), be connected with the open circuit branch (3) of 1/4th local oscillator wavelength, junction in the open circuit branch (3) of intermediate frequency low pass filter (5) and 1/4th local oscillator wavelength is connected with little band and substrate integration wave-guide transducer (6), on dielectric substrate (I), also be provided with the local oscillation signal transmission line (8) that is used to import local oscillation signal, on local oscillation signal transmission line (8), be connected with the long short circuit branch (4) of 1/2nd rf waves, connection central point in above-mentioned 1/4th local oscillator wavelength open branches (3) is connected with diode connected in parallel to (1a with being connected of 1/2nd rf wave length road branches (4) between the central point, 1b), it is characterized in that on little band and substrate integration wave-guide transducer (6), being connected with substrate integration wave-guide (2) and this substrate integration wave-guide (2) for presenting the waveguide of bending shape, on substrate integration wave-guide (2) other end, be connected with the substrate integration wave-guide and the microstrip transitions device (7) that are used to export radiofrequency signal, above-mentioned substrate integration wave-guide (2) constitutes by two row's plated-through holes are set at the two-sided dielectric substrate that is provided with metal patch, is equipped with discontinuity at the turning of substrate integration wave-guide (2) and eliminates hole (10,11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100384971A CN100511830C (en) | 2006-02-27 | 2006-02-27 | Substrate integrated waveguide subharmonic upper frequency changer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100384971A CN100511830C (en) | 2006-02-27 | 2006-02-27 | Substrate integrated waveguide subharmonic upper frequency changer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1825683A CN1825683A (en) | 2006-08-30 |
| CN100511830C true CN100511830C (en) | 2009-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006100384971A Expired - Fee Related CN100511830C (en) | 2006-02-27 | 2006-02-27 | Substrate integrated waveguide subharmonic upper frequency changer |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SG171479A1 (en) | 2009-11-17 | 2011-06-29 | Sony Corp | Signal transmission channel |
| CN103474725B (en) * | 2013-07-23 | 2016-01-20 | 电子科技大学 | Millimeter wave broadband band pass filter |
| CN105024129B (en) * | 2015-07-21 | 2017-08-25 | 南京邮电大学 | Planar Magic-T based on folded form substrate integration wave-guide |
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2006
- 2006-02-27 CN CNB2006100384971A patent/CN100511830C/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| 一种平面结构的V波段上变频器. 恽小华，刘永坦，孙琳琳.红外与毫米波学报，第22卷第3期. 2003 |
| 一种平面结构的V波段上变频器. 恽小华，刘永坦，孙琳琳.红外与毫米波学报，第22卷第3期. 2003 * |
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| CN1825683A (en) | 2006-08-30 |
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