CN103812448A - Frequency mixer - Google Patents
Frequency mixer Download PDFInfo
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- CN103812448A CN103812448A CN201210440659.XA CN201210440659A CN103812448A CN 103812448 A CN103812448 A CN 103812448A CN 201210440659 A CN201210440659 A CN 201210440659A CN 103812448 A CN103812448 A CN 103812448A
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- matching network
- frequency
- local oscillator
- frequency mixer
- pass filter
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Abstract
The invention relates to improvement on the structure of a frequency mixer and provides a frequency mixer. The frequency mixer, low in frequency conversion loss, comprises a waveguide microstrip transition portion, a radio frequency band matching network, a local oscillator matching network and an intermediate frequency low pass filter. The structural key point of the frequency mixer is that the waveguide microstrip transition portion, the radio frequency band matching network, the local oscillator matching network and the intermediate frequency low pass filter are connected in sequence.
Description
Technical field
the present invention relates to the improvement of mixer architecture.
Background technology
in millimetre-wave attenuator, guidance system, the frequency translation of millimeter-wave signal is important problem.As frequency conversion device, millimeter wave mixer is widely used in communication, radar, remote sensing, electronic reconnaissance and antagonism and various electronic testing instrument, and its performance quality directly affects systematic function.General frequency mixer adopts fundamental wave mixing mostly, local oscillator and signal frequency are more or less the same, but millimeter wave local vibration source complex structure, cost higher, design immature, if directly adopt fundamental wave mixing device to carry out frequency conversion to millimeter wave, very high to local vibration source requirement, technical being not easy realized.
harmonic mixer utilizes local oscillator even-order harmonic and radio frequency to carry out mixing, therefore the required local frequency of this frequency mixer is 1/2,1/4 even 1/8 of signal frequency, the high-performance Solid Source that so just can make full use of existing microwave frequency band is made its local oscillator, overcome the difficulty that direct employing millimeter wave local vibration source brings, reduce the technical difficulty of radio-frequency transmitter, reduce system cost, improved the reliability of system.Therefore, the harmonic mixer value that has a wide range of applications in millimeter-wave systems field.The conversion loss of existing frequency mixer is higher.
Summary of the invention
the present invention is exactly for the problems referred to above, provides a kind of conversion loss low a kind of frequency mixer.
to achieve these goals, the present invention adopts following technical scheme, the present invention includes Waveguide-microbelt transition portion, radio band matching network, local oscillator matching network, intermediate frequency low pass filter, its structural feature is led microstrip transition part, radio band matching network, local oscillator matching network, intermediate frequency low pass filter and is connected successively.
as a kind of preferred version, radio band matching network of the present invention and local oscillator matching network by backward diode to being connected.
as another kind of preferred version, backward diode of the present invention is to adopting DBES105a Xiao Jite potential barrier backward diode pair.
beneficial effect of the present invention.
the present invention adopts intermediate frequency low pass filter, Waveguide-microbelt transition structure to obtain less conversion loss.Simulation result shows that at fixed intermediate frequency be 1GHz, and radiofrequency signal is in the time that 60-90GHz changes, and conversion loss is all lower than 24dB, minimum conversion loss 18.9dB.
Accompanying drawing explanation
in order to make technical problem solved by the invention, technical scheme and beneficial effect clearer, below in conjunction with the drawings and the specific embodiments, the present invention is further elaborated.Should be appreciated that embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
fig. 1 is schematic block circuit diagram of the present invention.
Embodiment
as shown in the figure, the present invention includes Waveguide-microbelt transition portion, radio band matching network, local oscillator matching network, intermediate frequency low pass filter, lead microstrip transition part, radio band matching network, local oscillator matching network, intermediate frequency low pass filter and be connected successively.
described radio band matching network and local oscillator matching network by backward diode to being connected.
described backward diode is to adopting DBES105a Xiao Jite potential barrier backward diode pair.Adopt Xiao Jite barrier diode as mixing element, utilize the nonlinear characteristic of diode to produce the n(2 of local oscillator, 4,6 ...) subharmonic and radiofrequency signal generation mixing, again by the design of matching network, reasonably utilize and suppress idle frequence, reclaiming the energy of some important idle frequences, and then select required intermediate frequency.Adopt reverse parallel connection diode pipe pair, output circuit only contains the product of local oscillator even-order harmonic and radiofrequency signal mixing, and frequency component is than the few half of single tube, and amplitude is but twice than single tube.Odd local oscillator harmonic mixing item only exists pipe to inside, and the interfering frequency of therefore exporting in circuit will reduce, thereby can reduce conversion loss and be particularly suitable for the mixing of E wave band eight subharmonic.
for intermediate frequency low pass filter, outside band, must realize the good inhibition of local oscillation signal and radiofrequency signal, on these frequency bands, guarantee not have parasitic passband.Intermediate frequency low pass filter is mainly by intermediate frequency, suppresses local oscillator and odd harmonic thereof, radio frequency, the radio frequency product with the mixing of local oscillator even-order harmonic.When reclaiming frequency without fixed duties, improve the isolation of port.The present invention adopts CMRC structure low pass filter, this filter have compact conformation, size little, to the unconspicuous feature of mismachining tolerance.The model of CMRC filter in HFSS, thin horizontal line has increased the inductance of transmission line, and the gap between fine rule has increased transmission line capacitor, and different inductance and electric capacity produce multiple transmission zeros, make circuit have the characteristic of slow wave and wide stopband.Simulation result only has 0.075 loss to intermediate-freuqncy signal, the odd harmonic of local oscillator, radiofrequency signal and local oscillator is had to inhibition more than 20dB.
be understandable that, above about specific descriptions of the present invention, only for being described, the present invention is not limited to the described technical scheme of the embodiment of the present invention, those of ordinary skill in the art is to be understood that, still can modify or be equal to replacement the present invention, to reach identical technique effect; Use needs as long as meet, all within protection scope of the present invention.
Claims (3)
1. a frequency mixer, comprise Waveguide-microbelt transition portion, radio band matching network, local oscillator matching network, intermediate frequency low pass filter, it is characterized in that leading microstrip transition part, radio band matching network, local oscillator matching network, intermediate frequency low pass filter and be connected successively.
2. a kind of frequency mixer according to claim 1, it is characterized in that described radio band matching network and local oscillator matching network by backward diode to being connected.
3. a kind of frequency mixer according to claim 1, is characterized in that described backward diode is to adopting DBES105a Xiao Jite potential barrier backward diode pair.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210440659.XA CN103812448A (en) | 2012-11-07 | 2012-11-07 | Frequency mixer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210440659.XA CN103812448A (en) | 2012-11-07 | 2012-11-07 | Frequency mixer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103812448A true CN103812448A (en) | 2014-05-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210440659.XA Pending CN103812448A (en) | 2012-11-07 | 2012-11-07 | Frequency mixer |
Country Status (1)
| Country | Link |
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| CN (1) | CN103812448A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048967A (en) * | 2015-08-20 | 2015-11-11 | 电子科技大学 | 340GHz eighth harmonic mixer |
| CN105141260A (en) * | 2015-08-20 | 2015-12-09 | 电子科技大学 | 420GHz 10th harmonic frequency mixer |
-
2012
- 2012-11-07 CN CN201210440659.XA patent/CN103812448A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048967A (en) * | 2015-08-20 | 2015-11-11 | 电子科技大学 | 340GHz eighth harmonic mixer |
| CN105141260A (en) * | 2015-08-20 | 2015-12-09 | 电子科技大学 | 420GHz 10th harmonic frequency mixer |
| CN105141260B (en) * | 2015-08-20 | 2018-10-16 | 电子科技大学 | A kind of ten th harmonic mixers of 420GHz |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140521 |