CN105390784A - Ultra-wideband frequency band synthesis circuit - Google Patents
Ultra-wideband frequency band synthesis circuit Download PDFInfo
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- CN105390784A CN105390784A CN201510808872.5A CN201510808872A CN105390784A CN 105390784 A CN105390784 A CN 105390784A CN 201510808872 A CN201510808872 A CN 201510808872A CN 105390784 A CN105390784 A CN 105390784A
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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
- H01P1/213—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies
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Abstract
The invention discloses an ultra-wideband frequency band synthesis circuit. The ultra-wideband frequency band synthesis circuit comprises a through path and a coupled path. A low frequency band input port and a synthesis output port are arranged on two ends of the through path. A high frequency band input port and a load port are arranged on two ends of the coupled path. The through path and the coupled path are composed of microstrip lines. The microstrip lines are made of ceramic sheets or white sapphire sheets. Both the thickness and the width of the microstrip lines are 0.127 mm, and coupled gaps among the microstrip lines are 0.127mm. The ultra-wideband frequency band synthesis circuit has the advantages that 250KHz-70GHz frequency band synthesis bandwidth requirements are met, the borne power is relatively large, the loss of the frequency high end is less than that of a conventional method, and the power of the high end is saved.
Description
Technical field
The present invention relates to a kind of ultra wideband frequency combiner circuit.
Background technology
Along with the development of measuring technology, requirement for microwave test instrument is that operating frequency is more and more higher, working frequency range is more and more wider, the high-end requirement of operating frequency of the microwave test instrument that current employing coaxially exports reaches 70GHz, frequency range low side requires also to reach 250kHz, demanded power output reaches more than+20dBm (input power of low frequency can reach+30dBm), the harmonic requirement of signal path reaches more than 60dBc, wide band radiofrequency signal like this is difficult to directly produce and process, must be realized by the mode of synthesizing after first segmentation, this just gives the bandwidth of operation of frequency range combiner circuit, bear power, loss provides very high requirement.Prior art adopts electronic switch to realize frequency range synthesis, working frequency range is difficult to the bandwidth demand meeting 250kHz-70GHz, the compression point of electronic switch is lower simultaneously (is limited by characteristic of semiconductor, the low-frequency compression point of below 100MHz is very low, most products only provides the compression point index of more than 100MHz), if input power exceedes compression point, the power characteristic of signal transmission and spectral purity will be caused to be subject to extreme influence.Therefore the synthesis how signal of each frequency range being carried out broadband like this at the output of tester exports and can bear larger input power is the difficult point faced at present.
Broadband frequency range synthetic technology is the key technology realizing broadband signal generation, be used in broadband test instrument, being how that wide-band output signal, as far as possible few minimizing power loss and signal spectrum worsen by the signal syntheses of frequency-division section process in the rear end of signal path, is the subject matter that frequency range synthetic technology faces.
Prior art mainly realizes broadband frequency range synthesis by electronic switch, a kind of technology is the MMIC switch adopting field effect transistor to realize, its operation principle adopts the break-make of multiple field effect transistor to realize frequency range synthesis, theory diagram as figure 5 illustrates, the signal of two frequency ranges, respectively from D1 port and the input of D2 port, exports after the synthesis of D3 port.Its feature is the semiconductor self-characteristic being limited by field effect transistor, compression point is general, it is very wide that bandwidth of operation is also difficult to do, reach 250KHz-70GHz full frequency band bandwidth of operation, it is very little that the size of pipe and parasitic parameter will do, technological level requires high, but too small pipe sizing can reduce it bears power, and bandwidth sum power index is difficult to compatibility.A switch chip of 1CG6-8054 of Shi De company of the present Jin You U.S. reaches 250kHz-70GHz bandwidth requirement, all the other highest frequencies only work 50GHz, its basic mechanical design feature as shown in Figure 6, the 1dB compression point (P-1dB) of this switch is+15dBm in 100MHz-70GHz frequency range, the loss of 50GHz is that the loss of 2.6dB, 70GHz does not provide.This technology can meet the broadband frequency range synthesis under low-power.
Another technology adopts the MMIC switch of PIN diode to realize, and the signal of two frequency ranges, respectively from e1 port and the input of E2 port, exports after the synthesis of E3 port.Its schematic diagram is as shown in Figure 7 and Figure 8: this technology have employed PIN diode series-parallel system and carrys out spread bandwidth, it bears power and burns power decision primarily of the diode of connecting, power characteristic is slightly better than field-effect diode switch, its difficulty realized also is that bandwidth is inadequate, bear power limited, reach the frequency of utilization of 70GHz, PIN diode must have very little parasitic parameter to realize, also high to the requirement of semiconductor technology, but along with the raising of pipe frequency of utilization, the reduction of the reduction of size and the power capacity of pipe will inevitably be brought, be difficult to meet current actual demand simultaneously.Broadband P IN switch best is at present the product of MA-COM company, in order to obtain good broadband character, this switch have employed special aluminium arsenide potassium technique, covers the operating frequency range of 50MHz-50GHz, upper frequency limit can expand to 70GHz, but performance index can not ensure; The maximum power that burns is (much larger than P
-1dB) be+23dm, bear power general.This technical approach can meet the low-power frequency range synthesis of 50MHz-50GHz.
The first technology is that the MMIC switch adopting field effect transistor to realize realizes frequency range synthesis, and its frequency range meets the frequency range synthesis requirement of 250kHz-70GHz substantially, but to be compression point lower for its shortcoming, and the high-end loss of frequency is larger.The P-1dB of 100MHz-70GHz frequency range is+15dBm (below 100MHz compression point is lower), as the close+15dBm of input power, harmonic characterisitic can be brought sharply to worsen, and therefore can only be used for the occasion of small-power broadband frequency range synthesis; And its loss increases gradually along with the increase of operating frequency, be that 2.6dB, 70GHz are about 4dB at 50GHz, high-end loss is larger.
The second technology adopts PIN diode MMIC switch to realize frequency range synthesis, wideband switch operating frequency best is at present 50MHz-50GHz, frequency is the highest can expand to 70GHz reluctantly, but its insertion loss index cannot ensure, its frequency low side can only arrive 50MHz simultaneously, below 50MHz frequency range cannot work, and this technology only can meet the frequency range synthesis occasion of 50MHz-70GHz reluctantly, and bandwidth cannot all cover 250KHz-70GHz bandwidth.In power, this technology does not provide 50MHz-50GHz frequency range P-1dB index, only provides that to burn power be+23dm, infers that P-1dB is far below+23dm, adopts this technology to exceed+23dBm and switch will be caused to burn, bear power limited according to know-why; In loss, only following present performance index in 50GHz frequency range, 50GHz-70GHz frequency range does not provide specific targets.Therefore adopt this technology both cannot meet bandwidth requirement, also cannot meet the frequency range synthesis occasion that input power is larger, its major defect is that frequency band is wide not, to bear power not high enough, and high-frequency loss is large.
In sum, adopt existing two kinds of technology all cannot meet the requirement of 250kHz-70GHz frequency range combiner circuit for bandwidth sum input power, and its loss raises with frequency and increases, high-end loss is large.
Summary of the invention
The technical problem to be solved in the present invention is to provide one and can meets the requirement of 250KHz-70GHz frequency range synthetic bandwidth, bear that power is comparatively large, the high-end loss of frequency is less than conventional method, saves the ultra wideband frequency combiner circuit of high side power.
For solving the problem, the present invention adopts following technical scheme:
A kind of ultra wideband frequency combiner circuit, comprise through path and coupling path, described through path two ends are provided with low-frequency range input port and synthesis output port, described coupling path two ends are provided with high band input port and load port, described through path and coupling path are made up of microstrip line, described microstrip line is made up of potsherd or white stone sheet, and described microstrip line thickness and width are 0.127mm, and the gap that is coupled between described microstrip line is 0.127mm.
As preferably, described potsherd and white stone sheet dielectric constant are 9.6-9.9.
As preferably, described ultra wideband frequency combiner circuit is applicable to the synthesis of 250KHz-70GHz ultra wideband frequency.
Beneficial effect of the present invention is:
1) working band is wide: can realize 250KHz-70GHz tester ultra wideband frequency complex functionality, and the frequency segmentation point of frequency range synthesis is by the length adjustment of coupling microstrip;
2) power is born large: because microstrip line construction does not adopt active circuit, it bears power and realizes primarily of the microstrip circuit of built-up circuit, bear power and be better than broadband P IN switch and fet switch, be difficult to the humorous clutter worsening output signal, the spectral purity of signal can be maintained after this circuit.
3) there is lower high frequency power loss: the high band loss of frequency range combiner circuit reduces with the rising of frequency, can reduce the loss of high band power output.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of ultra wideband frequency combiner circuit of the present invention.
Fig. 2 is a kind of ultra wideband frequency combiner circuit of the present invention 35GHz frequency range combiner circuit performance index performance plots.
Fig. 3 is a kind of ultra wideband frequency combiner circuit of the present invention 40GHz frequency range combiner circuit performance index performance plots.
Fig. 4 is a kind of ultra wideband frequency combiner circuit of the present invention 50GHz frequency range combiner circuit performance index performance plots.
Fig. 5 is a kind of is the MMIC on-off principle figure adopting field effect transistor.
Fig. 6 is a kind of is the compression point curve chart of MMIC switch adopting field effect transistor.
A kind of schematic diagram adopting the MMIC switch of PIN diode of Fig. 7.
A kind of external structure adopting the MMIC switch of PIN diode of Fig. 8.
Embodiment
As shown in Figure 1, a kind of ultra wideband frequency combiner circuit, comprise through path 1 and coupling path 2, described through path 1 two ends are provided with low-frequency range input port 3 and synthesis output port 4, described coupling path 2 two ends are provided with high band input port 5 and load port 6, and described through path 1 and coupling path 2 are made up of microstrip line, and described microstrip line is made up of potsherd or white stone sheet, described microstrip line thickness and width are 0.127mm, and the gap that is coupled between described microstrip line is 0.127mm.
Described potsherd and white stone sheet dielectric constant are 9.6-9.9.
Described ultra wideband frequency combiner circuit is applicable to the synthesis of 250KHz-70GHz ultra wideband frequency.
Operation principle of the present invention: when the substrate dielectric constant of microstrip line is 1, now microstrip line transformation is strip line, parity mode phase velocity is equal, according to the design theory of directional coupler, now synthesize the strange mould of output port 4 and export identical with even mould output size, amplitude is contrary, the signal exported is 0, and export now microstrip line and be desirable directional coupling structure, signal exports from straight-through port 6 with less loss, but be greater than 1 due to the dielectric constant of microstrip line, the dielectric material dielectric constant of the air above microstrip line and below is unequal, thus make the parity mode transmission speed of microstrip line unequal, parity mode power output on synthesis output port 4 can not cancel each other, the signal of high band input port 5 is just synthesized output port 4 coupling output, frequency is higher, coupled power is larger, thus realize frequency range switching and merging function, compared with designing with traditional microstrip directional coupler, microstrip line directional coupler is 0 to make synthesis output port 4 power, dielectric constant is as far as possible little, the length of coupled structure is short (quarter-wave), thus make parity mode phase velocity differ little, isolated port signal is close to 0.And the present invention is just in time contrary, utilize dielectric constant larger, the feature that parity mode phase velocity difference is larger, select the microstrip line that dielectric constant is high, coupling size is long, strengthen the difference of parity mode phase velocity, the power being transferred to synthesis output port 4 is no longer 0, when frequency raises, its value constantly increases, and signal mainly exports from port 4, and traditional isolated port is transformed to high-frequency coupling signal port; When frequency is lower, its value is less, and port 4 is still approximately isolated port, and low frequency signal mainly exports from port 6.
In use, high-frequency signal inputs from high band input port 5, low frequency signal inputs from low-frequency range input port 3, composite signal exports from synthesis output port 4, along with the rising of frequency, the coupling of microstrip line is strengthened, the input signal that frequency is higher can be coupled to another one path with less loss, at through path 1, the input signal that frequency is lower can with less loss from 3 port transmission to synthesis output port 4, the input signal that frequency is higher can be coupled to the load port 6 of coupling path 2, absorbed by load, through path 1 is made to be equivalent to a low pass filter, only can the lower signal of transmission frequency, be used as the low-frequency range path of frequency range synthesis, at coupling path 2, the input signal that frequency is lower can be transferred to load port 6 with less loss, absorbed by load, the input signal that frequency is higher is coupled to the synthesis output port 4 of through path 1, coupling path 2 is made to be equivalent to a high pass filter, only can the higher signal of transmission frequency, be used as the high band path of frequency range synthesis, the transmission direction of low-and high-frequency segment signal is all towards synthesis outbound course, and have good isolation therebetween, have good directivity, last low-and high-frequency segment signal completes synthesis at synthesis output port 4, thus achieves the function of broadband frequency range synthesis.
Experimental example 1
The potsherd adopted and white stone sheet dielectric constant are 9.6, microstrip line thickness, width and coupling gap are 0.127mm, coupling length is respectively 5.57mm, 4.48mm and 3.9mm, corresponding coupling waypoint frequency is respectively 35GHz, 40GHz and 50GHz, the Ensambel software that the design size of coupled structure substitutes into ANSOFT company is carried out Electromagnetic Simulation checking, obtain frequency range combiner circuit performance index performance plot 2-Fig. 4, wherein a is low band loss, b is high band loss, and c is the isolation of high low band.
As can be seen from Fig. 2-Fig. 4, the bandwidth of operation of frequency range combiner circuit meets the bandwidth requirement of 250KHz-70GHz, the frequency of waypoint and design frequency differ very little, isolation between height frequency range is greater than 25dB, the maximum transmitted loss of two frequency ranges is 3.0dB, high band is only 0.3dB-1.4dB in the loss of 70GHz, is better than the frequency range combiner circuit that on-off mode realizes, effectively can improves output high frequency power when equal input power.
Beneficial effect of the present invention is:
1) working band is wide: can realize 250KHz-70GHz tester ultra wideband frequency complex functionality, and the frequency segmentation point of frequency range synthesis is by the length adjustment of coupling microstrip;
2) power is born large: because microstrip line construction does not adopt active circuit, it bears power and realizes primarily of the microstrip circuit of built-up circuit, bear power and be better than broadband P IN switch and fet switch, be difficult to the humorous clutter worsening output signal, the spectral purity of signal can be maintained after this circuit.
3) there is lower high frequency power loss: the high band loss of frequency range combiner circuit reduces with the rising of frequency, can reduce the loss of high band power output.
The above, be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, and any change of expecting without creative work or replacement, all should be encompassed within protection scope of the present invention.
Claims (3)
1. a ultra wideband frequency combiner circuit, it is characterized in that: comprise through path and coupling path, described through path two ends are provided with low-frequency range input port and synthesis output port, described coupling path two ends are provided with high band input port and load port, described through path and coupling path are made up of microstrip line, described microstrip line is made up of potsherd or white stone sheet, and described microstrip line thickness and width are 0.127mm, and be coupled between described microstrip line gap 0.127mm.
2. ultra wideband frequency combiner circuit according to claim 1, is characterized in that: described potsherd and white stone sheet dielectric constant are 9.6-9.9.
3. ultra wideband frequency combiner circuit according to claim 2, is characterized in that: described ultra wideband frequency combiner circuit is applicable to the synthesis of 250KHz-70GHz ultra wideband frequency.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106788785A (en) * | 2016-11-17 | 2017-05-31 | 中国电子科技集团公司第四十研究所 | A kind of multifunctional broad-band detecting circuit |
| CN107492699A (en) * | 2016-06-12 | 2017-12-19 | 中兴通讯股份有限公司 | A kind of frequency combiner, design method and communicator |
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Cited By (2)
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Application publication date: 20160309 |