CN101609916A - A kind of 18-40GHz double balanced mixer of star structure - Google Patents
A kind of 18-40GHz double balanced mixer of star structure Download PDFInfo
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- CN101609916A CN101609916A CNA2009100596470A CN200910059647A CN101609916A CN 101609916 A CN101609916 A CN 101609916A CN A2009100596470 A CNA2009100596470 A CN A2009100596470A CN 200910059647 A CN200910059647 A CN 200910059647A CN 101609916 A CN101609916 A CN 101609916A
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Abstract
A kind of 18-40GHz double balanced mixer of star structure belongs to microwave and millimeter wave technical field, relates to the double balanced mixer of star structure.Comprise double ridged waveguide, be positioned at the hybrid circuit board and the medium frequency output end at E face place, double ridged waveguide center.The present invention carries out rectigradation to 18-40GHz double ridged waveguide two ridge height and reduces, and is convenient to install diode, helps to improve the impedance matching between fin line and the coplanar stripline simultaneously; When intermediate frequency is drawn, inner wire passes dielectric substrate and extends to inside cavity and close chamber wall, improving the symmetry of local oscillator and radiofrequency signal field structure, thereby improve the balance of four diodes, improve the isolation between conversion loss and local oscillator, the radiofrequency signal; Adopt the ripple pearl to draw intermediate frequency, easy for installation, good reliability; Place, intermediate frequency leading point on the narrow limit of ridge waveguide increases a boss, helps to increase intermediate-frequency bandwidth.The present invention has that working band is wide, and size is little, and conversion loss is little, and advantages such as high-isolation have a good application prospect in ultra-wide band transceiver.
Description
Technical field
The invention belongs to microwave and millimeter wave technical field, relate to a kind of millimeter wave ultra-wideband hybrid integrated circuit double balanced mixer.
Background technology
Frequency mixer be realize two frequencies (or its harmonic wave) and or the device of difference operation, be the critical component in the superheterodyne receiver, its index has determined the performance of whole receiving system to a great extent.The double balanced mixer of star structure, its circuit theory as shown in Figure 1, by the star structure that four identical mixer diodes constitute, the negative pole of the positive pole of diode 1,3 and diode 2, the 4 formation medium frequency output end that is connected together; Then local oscillation signal is divided into the opposite two paths of signals of phase place and is input to two groups of diodes (one group of diode 1,4 composition respectively, diode 2,3 is formed another group) on, simultaneously radiofrequency signal being divided into opposite two paths of signals is input to respectively on two groups of diodes ( diode 1,2 is formed a group, and diode 3,4 is formed another group); Nonlinear characteristic by diode realize two balanced mixings (the intermediate frequency output signal be mainly local oscillator and radio frequency fundamental signal and or difference signal, and other noise signals obtain good restraining because the nonlinear characteristic of diode is cancelled out each other).
Development and use along with electromagnetic spectrum, it is crowded to capacity that the superhigh frequency band frequency resource has seemed, make people seek development space to more high-end millimeter wave band, microwave system has expanded to millimeter wave band, thereby be necessary to study various millimeter wave broadband devices, as frequency mixer, frequency multiplier, filter etc.These devices mostly need frequency expansion to arrive 40GHz or higher, for example: the 18-42GHz receiver in a broadband, in application usually its frequency range that to be divided into 6 bandwidth be 4GHz, it is 2-6GHz or 4-8GHz that each frequency range is down-converted to intermediate frequency respectively, so, then need a plurality of frequency mixers, brought inconvenience to application.If adopt a frequency mixer, can cover the 18-40GHz ultrabroad band, will bring great convenience for practical engineering application.
For the volume that reduces receiving system and improve its performance, modern radar with guidance, electronic countermeasures, communicate by letter, the operating frequency of radio astronomy, remote sensing telemetry system progressively expands to millimeter wave frequency band.Therefore also the performance of millimeter wave mixer has been proposed more and more higher requirement, research is low-cost, high performance millimeter wave mixer also becomes a very important problem.And super-broadband tech is having outstanding advantage also more and more to come into one's own owing to it aspect anti-interference and millimetre-wave attenuator and the high data rate transfers, and the most working band of traditional millimeter wave mixer is narrow, can not use in striding the audio range frequency scope.
Existing a kind of hybrid integrated circuit double balanced mixer be United States Patent (USP) (U.S.Pat.Nos.:4,291,415, the applying date: on September 22nd, 1981) the hybrid integrated circuit double balanced mixer of a kind of star structure of Ti Chuing, as shown in Figure 2.The double balanced mixer of this star structure comprises a rectangular waveguide, is positioned at the dielectric substrate and the intermediate frequency coaxial output line of E face position, rectangular waveguide center.Described dielectric substrate tow sides respectively have two strip metal conduction bands, center on the substrate between the two strip metal conduction bands has a plated-through hole, is connected a mixer diode respectively between positive and negative two pads of plated-through hole and the double-edged four strip metal conduction bands of substrate.The coaxial line of intermediate frequency coaxial output line mouth passes the centre bore on the narrow limit of rectangular waveguide, and its inner wire is connected to the plated-through hole position of substrate.
During this frequency mixer work, local oscillator and radio frequency fundamental signal are imported from the waveguide feed-in mouth at frequency mixer two ends respectively; Wherein, the left end input signal mainly is bound in by two-sided fin-line transition electric field among the slit of conduction band on the substrate along the substrate left end, and its direction of an electric field is parallel to the surface of substrate; The right-hand member input signal passes through utmost point fin-line transition along the substrate right-hand member, and its direction of an electric field is perpendicular to substrate surface.Two port input signals are added to the field structure quadrature on the diode.
This frequency mixer is owing to adopt rectangular waveguide, and its bandwidth of operation can't cover the whole frequency of 18～40GHz, and its intermediate frequency is drawn and adopted the coaxial line structure simultaneously, inner wire and the dielectric core that need process coaxial line respectively, assembling difficulty and poor reliability.Because the inner wire of intermediate frequency coaxial line extend in the waveguide cavity position of half, destroyed the structural symmetry of this double balanced mixer, worsened this important index of conversion loss to a certain extent.
Summary of the invention
The invention provides a kind of 18-40GHz double balanced mixer of star structure, with respect to prior art, frequency mixer provided by the invention can cover the whole frequency of 18～40GHz, has lower conversion loss and the reliability of Geng Gao.
Technical solution of the present invention is as follows:
A kind of 18-40GHz double balanced mixer of star structure, to shown in Figure 11, comprise the 18～40GHz double ridged waveguide that constitutes together by metallic cavity 5 and metallic cavity 6, hybrid circuit board 4 and the intermediate frequency coaxial output line that is positioned at E face position, described double ridged waveguide center as Fig. 3.The height of two ridges 32,33 of described double ridged waveguide becomes big by the centre gradually to two ends; Increase boss 7,8 in the position, narrow limit of the zone line of described double ridged waveguide and subtract high the processing with narrow limit to double ridged waveguide.Described hybrid circuit board 4 comprises dielectric substrate 1 and four identical mixer diodes 23,24,25 and 26; The tow sides 2,3 of dielectric substrate 1 respectively have two strip metal conduction bands; Center on the dielectric substrate 1 between the two strip metal conduction bands has a plated-through hole 27, be connected a mixer diode respectively between positive and negative two pads 28 of plated-through hole and the double-edged four strip metal conduction bands of substrate, the connected mode between four mixer diodes and metal conduction band and the plated-through hole 27 forms two balanced mixing modes of standard star structure.The intermediate frequency coaxial output line is made of ripple pearl 9, the outer conductor of ripple pearl 9 is fixed in by conducting resinl in the central through hole on narrow limit of metallic cavity 6, the plated-through hole 27 that the inner wire 10 of ripple pearl 9 passes the central through hole on narrow limit of metallic cavity 6 and substrate extends in the metallic cavity 5 and near the narrow limit of metallic cavity 5, the inner wire 10 of ripple pearl 9 is connected with the double-edged pad 28 of the plated-through hole 27 of dielectric substrate 1, and the intermediate-freuqncy signal output of ripple pearl 9 links to each other with the coaxial crossover sub 40 of SMA.
Need to prove:
1, in order to have enough spaces that diode is installed and to draw intermediate frequency, simultaneously encouraged higher mode because of discontinuity in order to reduce, we have carried out rectigradation to the height of standard 18-40GHz double ridged waveguide two ridges and have reduced to handle, the installation question that the i.e. 18-40GHz ridge waveguide apart from overgauge between double ridged waveguide two ridges of diode installation region, this measure have solved diode helps to improve the impedance matching between fin line and the coplanar stripline simultaneously.
2, traditional intermediate frequency lead-out mode is to adopt coaxial line to draw intermediate frequency, and is like this then need to process respectively the inner and outer conductor of coaxial line, brought the difficulty of fit on, and poor reliability.We draw intermediate frequency by using the ripple pearl at this, and are easy for installation, good reliability.
When 3, adopting the ripple pearl to draw intermediate frequency, the inner wire of ripple pearl passes dielectric substrate and extends to the narrow limit of metallic cavity 5 inner and close metallic cavity 5, can improve the symmetry of local oscillator and radiofrequency signal field structure like this, thereby improve the balance of four diodes, help to improve the isolation between conversion loss and local oscillator, the radio frequency.
4, the local oscillator of whole frequency mixer and radiofrequency signal all are the 18-40GHz double ridged waveguide port WRD180 feed-ins by standard, and these two ports are respectively by two-sided fin-line transition with to utmost point fin-line transition, and wherein local oscillator and rf inputs mouth can exchange.
5, on the cross section of the ridge waveguide of intermediate frequency leading point and diode installation place, in order to reduce the echo path of diode to the coaxial outer conductor of intermediate frequency transmission, we have carried out subtracting height to this regional ridge waveguide, have promptly increased a convex, and this measure helps to increase intermediate-frequency bandwidth.
Frequency mixer of the present invention adopts two balance fundamental wave mixing modes, has less system noise factor and lower conversion loss; Adopt hybrid-intergated-circuit technique, can obtain less circuit size; Whole mixting circuit is finished in one section double ridged waveguide chamber, has avoided the huge and complicated plane balun circuit of design volume.Use to utmost point fin line and two-sided fin line has simultaneously guaranteed local oscillator and the isolation more than the radio frequency 20dB, utilize technology of the present invention, we have obtained small size, low cost, and conversion loss is less than the millimeter wave broadband frequency mixer that works in the 18-40GHz full frequency band of 9dB and high-isolation.
The present invention has following beneficial effect:
1, the present invention can work in the ultra wide band frequency of 18-40GHz.
2, whole mixting circuit is finished in one section ridge waveguide cavity and has been reduced volume greatly.Local oscillator and prevention at radio-frequency port adopt the 18-40GHz double ridged waveguide interface of standard, are convenient to the interconnection of other devices and integrated.
3, the use to utmost point fin line and two-sided fin line has guaranteed the isolation more than the 20dB between local oscillator and the radio frequency, and owing to the inherent characteristic of two balanced mixings and fin line field structure, this frequency mixer local oscillator is better than 20dB to the good isolation degree is arranged between the intermediate frequency simultaneously.
4, the present invention minimum 4dB that reaches of conversion loss in full frequency band 18-40GHz scope.
5, by double ridged waveguide being subtracted high the processing, increased the intermediate frequency bandwidth of operation, the output intermediate frequency can expand to 8GHz.
6, by using the ripple pearl to draw intermediate frequency, can improve reliability so that easy for installation.
When 7, drawing intermediate frequency by employing ripple pearl, the inner wire of ripple pearl passes dielectric substrate, and stretches out one section suitable length of dielectric substrate, has strengthened the symmetry of structure, has improved conversion loss and radio frequency, local oscillator isolation.
Emulation and measured result show, this kind frequency mixer has that working band is wide, and size is little, and conversion loss is little, and advantages such as high-isolation have a good application prospect in ultra-wide band transceiver.
Description of drawings
Fig. 1 is the circuit theory diagrams of star structure double balanced mixer.
Fig. 2 is the structural representation of existing a kind of hybrid integrated circuit star structure double balanced mixer.
Fig. 3 is the structural representation of 18-40GHz double balanced mixer of the present invention.
Fig. 4 is the circuit structure diagram of hybrid circuit board among the present invention.
Fig. 5 is the cross-sectional view of the present invention along A-A ' direction among Fig. 4.
Fig. 6～8 are respectively the cross-sectional view of the present invention along B-B ', C-C ' and D-D ' direction among Fig. 4, Fig. 5, and wherein Fig. 6 a, Fig. 7 a, Fig. 7 a, Fig. 8 b are the field distribution schematic diagram in the medium of above-mentioned position.
Fig. 9 is the partial enlarged drawing of Fig. 4, characterizes the installation site of diode.
Figure 10 is the cross-sectional view of the present invention along E-E ' direction among Fig. 7.
Figure 11 is the cross-sectional view of the present invention along F-F ' direction among Fig. 3.
Embodiment
A kind of 18-40GHz double balanced mixer of star structure, to shown in Figure 11, comprise the 18～40GHz double ridged waveguide that constitutes together by metallic cavity 5 and metallic cavity 6, hybrid circuit board 4 and the intermediate frequency coaxial output line that is positioned at E face position, described double ridged waveguide center as Fig. 3.The height of two ridges 32,33 of described double ridged waveguide becomes big by the centre gradually to two ends; Increase boss 7,8 in the position, narrow limit of the zone line of described double ridged waveguide and subtract high the processing with narrow limit to double ridged waveguide.Described hybrid circuit board 4 comprises dielectric substrate 1 and four identical mixer diodes 23,24,25 and 26; The tow sides 2,3 of dielectric substrate 1 respectively have two strip metal conduction bands; Center on the dielectric substrate 1 between the two strip metal conduction bands has a plated-through hole 27, be connected a mixer diode respectively between positive and negative two pads 28 of plated-through hole and the double-edged four strip metal conduction bands of substrate, the connected mode between four mixer diodes and metal conduction band and the plated-through hole 27 forms two balanced mixing modes of standard star structure.The intermediate frequency coaxial output line is made of ripple pearl 9, the outer conductor of ripple pearl 9 is fixed in by conducting resinl in the central through hole on narrow limit of metallic cavity 6, the plated-through hole 27 that the inner wire 10 of ripple pearl 9 passes the central through hole on narrow limit of metallic cavity 6 and substrate extends in the metallic cavity 5 and near the narrow limit of metallic cavity 5, the inner wire 10 of ripple pearl 9 is connected with the double-edged pad 28 of the plated-through hole 27 of dielectric substrate 1, and the intermediate-freuqncy signal output of ripple pearl 9 links to each other with the coaxial crossover sub 40 of SMA.
Below we mainly introduce mixting circuit substrate 4 shown in Figure 4, suppose that radiofrequency signal is from the input of the ridge waveguide port of left end shown in Figure 4.On-chip metal conduction band 11,11 ', 12,12 ' (with the identical position of another side of the numeral substrate of ' mark, below identical) carry out gradual change with cosine square function, and the slit between them 13,13 ' constituted two-sided fin line together, as shown in Figure 6.When signal when the ridge waveguide port is imported with the TE10 mould, the tow sides of substrate are equipotential, for example, conduction band 11,12 and 11 ', 12 ' two line of rabbet joint constituting be parallel, and be equiphase, shown in Fig. 6 a.Electric field in this line of rabbet joint is parallel with dielectric substrate, because the field of the line of rabbet joint is the ridge waveguide port feed-in by balance, so do not need the Ba Lun circuit.By fin-line transition, radiofrequency field mainly concentrate on the slit 13,13 of the line of rabbet joint ' among, and conduction band 11,12 is directly continuous with coplanar stripline 14,15, can produce continuity scarcely at this.
As shown in Figure 4, suppose the ridge waveguide port input of local oscillation signal from right-hand member, 16,17 among Fig. 4 represents the double-edged metal level of substrate 1 respectively, and these two metal levels have a crossing zone 18 in the vertical, as shown in Figure 7.In fact the field of local oscillation signal mainly concentrates on the zone that this intersects, and its direction of an electric field is perpendicular to dielectric substrate, shown in Fig. 7 a.
On-chip conduction band is divided into two-way 19,20 (back side be 19 ', 20 ') after through zone 21, tow sides are totally four strip metal conduction bands together, local oscillation signal can be added to respectively on four diodes by these conduction bands so, and promptly the local oscillator feed side does not need complicated Ba Lun circuit yet.
So far, we know that frequency mixer of the present invention comprises the conduction band 14 of four balances, 15,14 ', 15 ' feed-in line, local oscillator and radiofrequency signal be respectively by two-sided fin line with to this two the crossed field master moulds feed-in of utmost point fin line, its direction of an electric field respectively with substrate parallel with vertical, other higher mode then is suppressed.
Because the size of mixer diode is bigger, and the distance between 18-40GHz double ridged waveguide two ridges of standard is 1.45mm, do not have enough spaces that diode is installed and draw intermediate frequency, we have carried out gradual change to two ridges of double ridged waveguide and strengthen and handle at this.As shown in figure 11, two ridges, 32,33 rectigradations of double ridged waveguide increase, like this since, solved diode difficult problem be installed, help to improve the impedance matching between fin line and the coplanar stripline simultaneously.
This frequency mixer comprises four non-linear frequency mixing diodes 23,24,25,26, and it is installed as Fig. 9, and is shown in Figure 10, and cross-over connection is between the pad and metal conduction band of the plated-through hole of dielectric substrate.Among Fig. 4 27 is that plated-through hole, 28 is the pad of plated-through hole, and plated-through hole 27 is as the intermediate frequency leading point.The positive pole of mixer diode 23 connects metal conduction band 14, and its negative pole connects pad 28; The negative pole of mixer diode 24 connects metal conduction band 15, and its positive pole connects pad 28; The positive pole of mixer diode 25 connect metal conduction band 15 ', its negative pole connects pad 28; The negative pole of mixer diode 26 connect metal conduction band 14 ', its positive pole connects pad 28.So, the arrangement of four diodes has constituted two balanced mixing modes of standard star structure, and local oscillator and radiofrequency signal are by the coplanar stripline feed-in of balance, and intermediate frequency also can be drawn easily.
As shown in Figure 4, the field of horizontal pattern from left end ridge waveguide port input through coplanar stripline 14,15 at 29 places by short circuit; The field of vertical pattern is imported through being divided into two- way 19,20 after the substrate tow sides overlapping areas 18 from right-hand member ridge waveguide port and is metallized the ground hole short circuit at 30,31 places.Line of rabbet joint short circuit face is the quarter-wave guide wavelength of radio frequency centre frequency from the distance of settling the diode location place, and it is to the radio frequency signal shorts; Metallization ground hole short circuit face is the quarter-wave guide wavelength of local oscillator centre frequency from the distance of placing the diode location place, and it is to the local oscillation signal short circuit.Local oscillator and radio frequency reflect at above-mentioned short circuit face through behind the diode, thereby make that the local oscillator and the radiofrequency signal that are added on the diode are the strongest.
As shown in Figure 4, be equipped with two row metallization ground holes 22 on mixting circuit plate 4, these ground holes are positioned between the metallic cavity shown in Figure 35,6, are to suppress for the leakage that prevents energy with to the higher mode that has encouraged in the substrate 1.
What deserves to be mentioned is, in above-mentioned statement we all with Fig. 4 in the two-sided fin line end of left port be the input radio frequency signal, right output port is the input local oscillation signal to utmost point fin line end, but these two ports can exchange in actual applications, and promptly each port can be according to the actual needs as local oscillator or prevention at radio-frequency port.
The principal element that influences intermediate-frequency bandwidth is to connect the length of the metal throuth hole 27 of diode to the earth-return between the wave guide wall (ripple pearl outer conductor 9).In order to obtain the intermediate-frequency bandwidth of broad, the length of this earth-return is short more good more, and the principal element that influences this length is the position of line of rabbet joint short circuit face, the position of metallization ground hole short circuit face and the wave guide wall position that should locate.And the position of short circuit face is relevant with local oscillator and radio frequency signal frequency, so in order to reduce the length of this grounded circuit, the wave guide wall that we draw the zone to the intermediate frequency of metallic cavity 6 subtracts height, has promptly increased a boss 7, as Fig. 3 and shown in Figure 5.Adopt this method we have obtained the intermediate-frequency bandwidth of broad with the cost that worsens a little conversion loss.Simultaneously in order to increase the symmetry of device, we subtract height with wave guide wall that the intermediate frequency of metallic cavity 6 is drawn the zone of zone symmetry in metallic cavity 5, promptly increased a boss 8, as Fig. 3 and shown in Figure 5.
As Fig. 5 and shown in Figure 10, when adopting the ripple pearl to draw intermediate frequency, the inner wire 10 of ripple pearl passes dielectric substrate and extends in the metallic cavity 5 and the narrow limit of close metallic cavity 5.Because double balanced mixer is had relatively high expectations to the symmetry of structure, so also the symmetry that diode is installed is had higher requirement.By ripple pearl inner wire 10 is passed dielectric substrate one segment length, improved the symmetry of local oscillator and radiofrequency signal field structure greatly, thereby the balance of four diodes is improved, help to improve the isolation between conversion loss and local oscillator, the radio frequency.
In sum, the frequency mixer operating frequency is 18-40GHz, and local oscillator and rf input interface are standard 18-40GHz double ridged waveguide WRD180.Adopt thickness 0.254mm, dielectric constant is 2.2 Duriod/Rogress 5880 dielectric substrates, from two-sided fin-line transition to coplanar stripline, again through being divided into two-way behind one section coplanar stripline, be added to respectively on two groups of diodes, have the problem of an impedance matching at this.The live width of coplanar stripline is chosen for 0.2mm, and the length of fin-line transition section is chosen and is about 2 guide wavelengths.Frequency mixer of the present invention can be applied to other different frequency range by using different waveguides, as the K wave band, and Ka wave band, U wave band etc.
Claims (1)
1, a kind of 18-40GHz double balanced mixer of star structure comprises the 18～40GHz double ridged waveguide that is made of together metallic cavity (5) and metallic cavity (6), hybrid circuit board (4) and the intermediate frequency coaxial output line that is positioned at E face position, described double ridged waveguide center; The height of two ridges of described double ridged waveguide (32,33) becomes big by the centre gradually to two ends; Increase boss (7,8) in the position, narrow limit of the zone line of described double ridged waveguide and subtract high the processing with narrow limit to double ridged waveguide; Described hybrid circuit board (4) comprises dielectric substrate (1) and four identical mixer diodes (23,24,25 and 26); The tow sides of dielectric substrate (1) (2,3) respectively have two strip metal conduction bands; Center between the last two strip metal conduction bands of dielectric substrate (1) has a plated-through hole (27), be connected a mixer diode respectively between positive and negative two pads (28) of plated-through hole (27) and the double-edged four strip metal conduction bands of substrate, the connected mode between four mixer diodes and metal conduction band and the plated-through hole (27) forms two balanced mixing modes of standard star structure; The intermediate frequency coaxial output line is made of ripple pearl (9), the outer conductor of ripple pearl (9) is fixed in by conducting resinl in the central through hole on narrow limit of metallic cavity (6), the plated-through hole (27) that the inner wire (10) of ripple pearl (9) passes the central through hole on narrow limit of metallic cavity (6) and substrate extends in the metallic cavity (5) and near the narrow limit of metallic cavity (5), the inner wire (10) of ripple pearl (9) is connected with the double-edged pad (28) of the plated-through hole (27) of dielectric substrate (1), and the intermediate-freuqncy signal output of ripple pearl (9) links to each other with the coaxial crossover sub of SMA (40).
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102005631A (en) * | 2010-10-15 | 2011-04-06 | 中国科学院紫金山天文台 | Base of waveguide sideband-separating superconducting tunnel junction mixer |
| CN103022604A (en) * | 2012-12-26 | 2013-04-03 | 中国航天空气动力技术研究院 | Compact type low-temperature second harmonic mixer base |
| CN104868852A (en) * | 2015-04-21 | 2015-08-26 | 中国电子科技集团公司第四十一研究所 | Passive double balanced mixer based on novel groove line-microstrip Balun |
| CN105007045A (en) * | 2015-07-24 | 2015-10-28 | 东南大学 | Terahertz fundamental wave mixing module |
| CN107565196A (en) * | 2017-08-30 | 2018-01-09 | 中国电子科技集团公司第二十九研究所 | A kind of millimeter wave Two-port netwerk sub-harmonic mixer |
| CN107968631A (en) * | 2018-01-26 | 2018-04-27 | 广东工业大学 | A kind of frequency mixer and its down coversion mixting circuit applied to K-band |
| CN108258427A (en) * | 2017-12-22 | 2018-07-06 | 珠海纳睿达科技有限公司 | A kind of concealed feed ridge waveguide slot antenna |
| CN113471760A (en) * | 2021-07-23 | 2021-10-01 | 深圳市联鸿盛科技有限公司 | Electric connector for circuit substrate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005631B (en) * | 2010-10-15 | 2012-11-21 | 中国科学院紫金山天文台 | Base of waveguide sideband-separating superconducting tunnel junction mixer |
| CN102005631A (en) * | 2010-10-15 | 2011-04-06 | 中国科学院紫金山天文台 | Base of waveguide sideband-separating superconducting tunnel junction mixer |
| CN103022604A (en) * | 2012-12-26 | 2013-04-03 | 中国航天空气动力技术研究院 | Compact type low-temperature second harmonic mixer base |
| CN104868852A (en) * | 2015-04-21 | 2015-08-26 | 中国电子科技集团公司第四十一研究所 | Passive double balanced mixer based on novel groove line-microstrip Balun |
| CN104868852B (en) * | 2015-04-21 | 2017-11-14 | 中国电子科技集团公司第四十一研究所 | A kind of passive double balanced mixer based on new line of rabbet joint microstrip balun |
| CN105007045B (en) * | 2015-07-24 | 2018-05-04 | 东南大学 | A kind of Terahertz fundamental wave mixing module |
| CN105007045A (en) * | 2015-07-24 | 2015-10-28 | 东南大学 | Terahertz fundamental wave mixing module |
| CN107565196A (en) * | 2017-08-30 | 2018-01-09 | 中国电子科技集团公司第二十九研究所 | A kind of millimeter wave Two-port netwerk sub-harmonic mixer |
| CN108258427A (en) * | 2017-12-22 | 2018-07-06 | 珠海纳睿达科技有限公司 | A kind of concealed feed ridge waveguide slot antenna |
| CN108258427B (en) * | 2017-12-22 | 2023-09-15 | 广东纳睿雷达科技股份有限公司 | Hidden feed ridge waveguide slot antenna |
| CN107968631A (en) * | 2018-01-26 | 2018-04-27 | 广东工业大学 | A kind of frequency mixer and its down coversion mixting circuit applied to K-band |
| CN107968631B (en) * | 2018-01-26 | 2023-09-12 | 广东工业大学 | Mixer applied to K wave band and down-conversion mixer circuit thereof |
| CN113471760A (en) * | 2021-07-23 | 2021-10-01 | 深圳市联鸿盛科技有限公司 | Electric connector for circuit substrate |
| CN113471760B (en) * | 2021-07-23 | 2023-06-30 | 深圳市联鸿盛科技有限公司 | Electric connector for circuit substrate |
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Application publication date: 20091223 |