CN114883768B - Rectangular corrugated metal strip sputtering ITO film equalization filtering SSPPs transmission line and filter - Google Patents
Rectangular corrugated metal strip sputtering ITO film equalization filtering SSPPs transmission line and filter Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention relates to a rectangular corrugated metal strip sputtering ITO film equalization filtering SSPPs transmission line and a filter, which solve the problems of continuous periodic parasitic frequency bands and the like existing outside the band of a traditional microwave equalizer in the prior art. The invention can further improve the working performance of the wireless communication system and the design efficiency of the novel microwave device, and has important theoretical research value and engineering guidance significance. The invention comprises an equalization filter SSPPs transmission line, wherein the equalization filter SSPPs transmission line is formed by cascading basic equalization filter SSPPs units, each equalization filter SSPPs unit comprises rectangular corrugated ITO film strips and a central metal strip I, and the central metal strip I is arranged at the central position between two parallel rectangular corrugated ITO film strips.
Description
Technical field:
the invention belongs to the technical field of microwave flexible filters, and relates to a rectangular corrugated metal strip sputtering ITO film equalization filtering SSPPs transmission line and a filter, wherein the filter is made of a flexible PET material and works in a microwave frequency band and has in-band amplitude equalization and out-of-band interference filtering functions.
The background technology is as follows:
in the existing broadband wireless electronic equipment, the maximum amplitude fluctuation difference caused by electromagnetic space propagation, microwave device frequency response and the like at different frequencies in a frequency band can reach 10dB, and the uneven amplitude-frequency response can cause radio signal distortion, influence the signal-to-noise ratio of fast Fourier transform, reduce the digital signal demodulation quality of the wireless equipment and increase the bit error rate. At present, the amplitude equalization is mostly processed in a digital domain, however, in the new trend of the development of electronic equipment to radio frequency direct sampling, the broadband digital amplitude equalization processing faces the new problems of excessive resource use, complicated tap coefficient, excessive power consumption of a multiplier and the like, and brings great challenges to the resources of a communication place. Although a microwave amplitude equalizer capable of being realized in hardware exists at present, most of the microwave amplitude equalizers adopt a resonant structure of a feeder loading discrete resistor and a quarter-wavelength resonant line, have continuous periodic spurious response on the whole frequency spectrum, and easily influence a high stop band suppression degree which can be realized by a filter through various technical means when being cascaded at the front end of electronic equipment, so that the periodic spurious response of the microwave amplitude equalizer needs to be improved through a new method.
Artificial surface plasmon (Spoof Surface Plasmon Polaritons, SSPPs) microwave devices are a recent research hotspot. Since 2004, it was discovered that adding periodic distributed holes to metal surfaces can reduce the surface plasmon frequency to the microwave frequency band, various structures of SSPPs have been proposed and used for microwave device design. Unlike conventional TEM transmission lines, SSPPs have surface electromagnetic dispersion that can prevent the propagation of electromagnetic energy above progressive frequencies over structures. The existing SSPPs filter synthesizes flat frequency response in the passband to realize standard filtering characteristics, but cannot compensate the amplitude of an electronic system with larger amplitude difference. While conventional microwave equalizers can compensate for amplitude non-uniformities in electronic systems, the continuous periodic spurious bands that the stop band has degrade the stop band rejection capability of the filter when cascaded to the microwave front-end of the electronic system.
At present, the amplitude compensation of an electronic system is realized in digital signal processing, and as electronic equipment gradually supports more and more communication standards, the instantaneous bandwidth of the electronic system is wider and wider, and the digital amplitude equalization is a universal amplitude compensation means in industry, but is in face of the future broadband or ultra-broadband wireless communication application, a large amount of digital resources of digital devices are required to be occupied, so that the amplitude equalization is required to be put into a microwave domain for processing. The traditional microwave amplitude equalizer has the problem of single function at present, and 1) the parasitic frequency band with the period exists outside the band, so that the deterioration of the out-of-band suppression of an electronic system is still easy to cause, and the working performance is reduced; 2) The problem of large resource occupancy rate of balanced processing in a digital domain in broadband electronic equipment is solved; 3) The problems of in-band amplitude equalization and out-of-band interference filtering are simultaneously realized on one microwave device; 4) The microwave device with the amplitude balancing function realizes the problem of structure flexibility; 5) The problem of poor in-band reflection coefficient of the equalization filter.
The invention comprises the following steps:
the invention aims to provide a rectangular corrugated metal strip sputtering ITO film equalization filtering SSPPs transmission line and a filter, which solve the problems of continuous periodic parasitic frequency bands and the like existing outside the band of a traditional microwave equalizer in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a rectangular corrugated metal strip sputtering ITO film equalization filtering SSPPs transmission line is characterized in that: the filter is formed by cascading basic equalization filter SSPPs units, wherein each equalization filter SSPPs unit consists of rectangular corrugated ITO film strips and a first central metal strip, and the first central metal strip is arranged at the central position between the two rectangular corrugated ITO film strips which are parallel and parallel.
A filter adopting rectangular corrugated metal strips to sputter ITO film to balance and filter SSPPs transmission lines is characterized in that: the two ends of the equalization filtering SSPPs transmission line are respectively provided with a momentum matching converter, and the equalization filtering SSPPs transmission line is connected with the momentum matching converters through a TEM transmission line; the momentum matching converter is composed of a rectangular corrugated groove line with gradually changed depth and index gradual change ground planes, rectangular metal strips with different widths are respectively arranged at two ends of the rectangular corrugated groove line with gradually changed depth, the rectangular metal strips with different widths are electrically connected with a second central metal strip, the rectangular corrugated groove line with gradually changed depth gradually converts the rectangular metal strips into a 50 ohm TEM transmission line to realize momentum matching, and the two index gradual change ground planes are respectively arranged at two ends of the rectangular corrugated groove line with gradually changed depth to realize conversion from a TEM mode to a TM mode.
The rectangular corrugated ITO film strip is formed by sputtering by a radio frequency magnetron sputtering method or a direct current magnetron sputtering method; the surface resistance of the rectangular corrugated ITO film strip is adjusted through sputtering power, sputtering time and oxygen concentration to realize different amplitude balance values in the passband of the filter; the position of the low-pass cut-off frequency of the filter is controlled by setting the width of the rectangular corrugated ITO film strip.
The first central metal strip and the second central metal strip are manufactured by ink-jet printing of nano silver conductive particles.
In an equalization filter SSPPs transmission line, the number of equalization filter SSPPs cells is set between one and infinity.
The depth of the rectangular corrugated slot line with gradually changed depth is linearly increased from 0 to the slot depth value of the equalization filter SSPPs unit through a plurality of times.
The number of the equalization filter SSPPs units is set according to actual use conditions, and the number is more than or equal to 1.
The exponentially graded ground plane satisfies an exponentially graded function y=f (x) =c 1 e ax +C 2 ，C 1 And C 2 And alpha is an exponential ramp coefficient, which is a fixed constant.
The number of linear increases was five; the number of equalization filter SSPPs units is four.
Rectangular corrugated ITO film strip width h=14+ -5 mm, length l 1 Surface resistance Z of rectangular corrugated ITO film strip =1.5 mm±1mm s =5 ohm/w±20ohm/W; a central metal strip between two rectangular corrugated ITO film strips has a width w=1.4+ -1 mm and a length l=3 mm+ -1 mm; the period p=6mm±2mm of the equalization filter SSPPs unit; width h of corrugated metal strip of rectangular corrugated groove line with gradually-changed depth 1 ＝3.91±1mm，h 2 ＝6.43±1mm，h 3 ＝8.95±1mm，h 4 Length l =11.47±1mm 3 =1.5mm±1mm, two widths w of the center metal strip 2 Length l=1.4mm±1mm 2 =3mm±1mm; exponential progression function parameter C 1 =0.5±0.02 and C 2 ＝2.7mm±0.2mm，α＝0.14±0.005,|x 2 -x 1 |＝25mm±0.5mm，|y 2 -y 1 |＝16.05mm±0.5mm。
Compared with the prior art, the invention has the following advantages and effects:
1. the invention provides a novel transmission line, which is formed by serially connecting equalization filter SSPPs units with the number being equal to or more than 2. The equalization filtering SSPPs unit consists of periodic groove lines SSPPs with defects of the ITO film and the rectangular corrugated metal strips, and the transmission line can introduce negative slope equalization characteristics by corroding the rectangular corrugated metal strips of the periodic groove lines SSPPs unit and sputtering the ITO film at the original position; compared with the traditional microwave equalizer, the equalization filtering SSPPs transmission line formed by a plurality of units can realize in-band amplitude equalization and out-of-band interference filtering at the same time, thereby overcoming the parasitic frequency band of the traditional microwave equalizer and improving the periodic parasitic response of the traditional microwave equalizer introduced outside the passband of the broadband wireless electronic equipment. The surface resistance of the rectangular corrugated ITO film strip can be controlled by controlling the sputtering power or the sputtering time or the oxygen concentration when the ITO film is sputtered by magnetron sputtering, so that different amplitude balance values in the passband of the SSPPs transmission line are balanced and filtered; the control of the cut-off frequency position of the equalization filter SSPPs transmission line can be realized by controlling the width of the rectangular corrugated ITO film strip. Compared with the method of sputtering ITO film at the position of the central metal strip, the equalizing filter passband has lower reflection coefficient. Finally, the transmission line is manufactured on a flexible PET material, so that flexible transmission of surface electromagnetic energy can be realized, and the filter can be subjected to surface conformal assembly in a compact electronic system.
2. The invention can effectively introduce the equalization characteristic of negative slope in the passband of the filter by sputtering the ITO film at the position of the rectangular corrugated metal strip of the periodic slot line SSPPs, can realize in-band amplitude equalization and out-of-band interference filtering simultaneously compared with the traditional microwave equalizer, overcomes the parasitic frequency band existing in the traditional microwave equalizer, improves the periodic parasitic response of the traditional microwave equalizer introduced outside the passband of the broadband wireless electronic equipment, and has lower reflection coefficient in the passband of the equalization filter compared with the method of sputtering the ITO film at the position of the central metal strip. The surface resistance of the rectangular corrugated ITO film strip can be controlled by controlling the sputtering power or the sputtering time or the oxygen concentration during magnetron sputtering, so that different amplitude balance values in the passband of the balance filter are realized, and in addition, the cut-off frequency position of the balance filter can be regulated and controlled by controlling the width of the rectangular corrugated ITO film strip. The equalization filter is manufactured on the flexible PET material, so that flexible transmission of surface energy of the filter can be realized, and the filter can be subjected to surface conformal assembly in a compact electronic system. Finally, the process is carried out,
3. the flexible equalization filter adopting the rectangular corrugated strip sputtering ITO of the transmission line can realize the amplitude equalization in the broadband and the interference filtering outside the broadband simultaneously in the electrical performance, improve the design efficiency of a microwave device and reduce the pressure on device resources when the broadband system performs the amplitude equalization in a digital domain; 2) Compared with an equalizing filter with an ITO film sputtered at the position of the central metal strip, the equalizing filter has smaller reflection coefficient in the passband; 3) The structure can be flexibly assembled into a broadband electronic system, so that the weight of electronic equipment is effectively reduced, and the high-density assembly of parts of the electronic system is realized.
Description of the drawings:
FIG. 1 is a full view of a flexible periodic slot line SSPPs equalization filter of the rectangular corrugated metal strip sputtered ITO film of the present invention;
FIG. 2 is a block diagram of a flexible periodic slot line SSPPs equalization filter of the rectangular corrugated metal strip sputtered ITO film of the present invention;
FIG. 3 is a schematic diagram of the mounting structure of a flexible periodic slot line SSPPs equalization filter of the rectangular corrugated metal strip sputtered ITO film of the present invention;
fig. 4 is a frequency response curve of a flexible periodic slot line SSPPs equalization filter of rectangular corrugated metal strips sputtered ITO film of the present invention.
In the figure, 1. Equalization filter SSPPs unit, 2. Rectangular corrugated ITO film strip, 3. Center metal strip, 4. Rectangular corrugated slot line with gradual depth, 5. Center metal strip, 2. Exponential gradual ground plane, 7.50 ohm TEM transmission line, 8. Wideband antenna, 9. Wideband low noise amplifier, 10. Gain amplifier, 11. Wideband equalization filter, 12. Down-conversion circuit, 13. Intermediate frequency filter, 14. Gain amplifier, three, 15. Reference crystal oscillator, 16. Frequency synthesizer, 17.AGC module, 18.A/D converter, 19. Microprocessor, 20. Correlation channel, 21. Memory.
The specific embodiment is as follows:
the present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
SSPPs generally have a wider upper stop band suppression range, and if a microwave equalizer and an SSPPs filter are integrally designed, the two microwave functions of equalization and filtering are realized at one time, so that the design efficiency of a microwave device can be improved, the parasitic frequency band of the traditional microwave equalizer can be overcome, and the method has important significance for compensating the amplitude difference of a broadband electronic system.
If the functions of the microwave equalizer and the filter are jointly realized on one microwave device, the periodic parasitic frequency band of the existing microwave equalizer can be solved, the integration of the equalizer and the filter can be realized, and the working efficiency of the microwave passive device is improved.
Equalization filtering SSPPs transmission lines are not proposed in the field of microwave equalizers, no related report exists at present, and the equalization filtering transmission lines are formed by introducing ITO films on the existing SSPPs transmission lines so as to realize different attenuation of electromagnetic energy of each frequency, namely, equalization quantity; and meanwhile, by combining the cut-off characteristic of SSPPs, the amplitude equalization and the interference filtering can be realized at the same time. The combination of the two functions of equalization and filtering is not a simple linear addition in structure, the problem of characteristic separation and quantization needs to be solved to realize independent quantization and control of the equalization filtering function at the same time, and parameters, loading positions and loading methods of the ITO film need to be carefully pushed to realize an SSPPs transmission line with the equalization filtering characteristic.
The invention relates to a flexible periodic slot line SSPPs equalizing filter of a rectangular corrugated metal strip sputtering ITO film, which adopts the following technical scheme: the device comprises a 50 ohm TEM transmission line, a momentum matching converter and an equalization filter SSPPs transmission line, wherein the two ends of the equalization filter SSPPs transmission line are respectively provided with the momentum matching converter, and the equalization filter SSPPs transmission line is connected with the momentum matching converter through the 50 ohm TEM transmission line; the equalization filter SSPPs transmission line consists of basic equalization filter SSPPs cells, which are single line structures with no ground plane as a reference or considered to be at infinity. The equalization filtering SSPPs unit consists of rectangular corrugated ITO film strips, slot lines and central metal strips, wherein the central metal strips are arranged at the central position between the two rectangular corrugated ITO film strips which are parallel and arranged in parallel, and the two rectangular corrugated ITO film strips are electrically connected with the central metal strips. The rectangular corrugated ITO film strip can utilize radio frequency magnetron sputteringThe ITO filter is formed by sputtering by a method or a direct current magnetron sputtering method, and the surface resistance of the ITO can be artificially adjusted by means of sputtering power, sputtering time, oxygen concentration and the like so as to realize different amplitude balance values in the passband of the filter; meanwhile, the width of the rectangular corrugated ITO film strip can be set manually so as to control the position of the low-pass cut-off frequency of the filter. The central metal strip can be made by ink jet printing of nano silver conductive particles. In the equalization filter SSPPs transmission line, the number of the equalization filter SSPPs units can be set between 1 and infinity artificially, and the artificial adjustment of the amplitude equalization value in the filter passband can be realized. The momentum matching transducer consists of a rectangular corrugated slot line with gradually changed depth and an exponentially graded ground plane. The depth of the rectangular corrugated groove line is linearly increased for a plurality of times, and the depth is increased from 0 to the groove depth value of the equalization filtering SSPPs unit, and the depth is defaulted to 5 times; the exponentially graded ground plane satisfies an exponentially graded function y=f (x) =c 1 e ax +C 2 ，C 1 And C 2 For a fixed constant, alpha is an exponential gradient coefficient, and the momentum matching converter can smoothly convert a TEM transmission wave on a 50 ohm transmission line into a TM polarized surface wave, and meanwhile, impedance matching between an input/output port and a flexible periodic slot line SSPPs transmission line is realized. The 50 ohm TEM transmission line may be comprised of CPW.
Examples:
referring to fig. 1 and 2, the rectangular corrugated metal strip sputtered ITO thin film flexible periodic slot line SSPPs equalization filter (hereinafter referred to as flexible SSPPs microwave equalization filter for convenience of description) of the present invention has electrical performance that frequency domain amplitude equalization and interference filtering are respectively implemented inside and outside the passband, and has a smaller reflection coefficient in the passband compared with the equalization filter sputtered ITO thin film at the center metal strip position; the flexible microwave equalization filter based on the PET material and the ITO film is structurally realized, the problem of continuous period parasitic frequency bands existing outside the band of the traditional microwave equalizer is solved, and the problems that digital equalization processing of the traditional broadband wireless electronic system occupies large digital chip resources and in-band amplitude equalization and out-of-band interference filtering are simultaneously realized on one microwave device can be solved. The structure is that the system comprises a 50 ohm TEM transmission line 7, a momentum matching converter and an equalization filtering SSPPs transmission line. EqualizationThe filtering SSPPs transmission line is formed by cascading basic equalization filtering SSPPs units 1, the number of the equalization filtering SSPPs units 1 can be set artificially according to actual use conditions, the number is more than or equal to 1, and the default number is set to be 4. The equalization filtering SSPPs unit 1 is of a single-line structure, and has no ground plane as a reference or is considered to be located at infinity; the equalization filtering SSPPs unit 1 consists of a rectangular corrugated ITO film strip 2 and a central metal strip 3. A central metal strip I3 is printed at the central position between two parallel rectangular corrugated ITO film strips 2 in an inkjet mode, the rectangular corrugated ITO film strips 2 can be sputtered by a radio frequency magnetron sputtering method or a direct current magnetron sputtering method, and the surface resistance of the rectangular corrugated ITO film strips 2 can be adjusted manually through sputtering power, sputtering time, oxygen concentration and other means so as to realize different amplitude balance values in the pass band of the filter; the width h of the rectangular corrugated ITO film strip 2 can be set manually to control the position of the low-pass cut-off frequency of the filter. The two ends of the equalization filtering SSPPs transmission line are respectively provided with a momentum matching converter, the momentum matching converter is composed of a rectangular corrugated groove line 4 with gradually changed depth and an index gradual change ground plane 6, the two ends of the rectangular corrugated groove line 4 with gradually changed depth are respectively provided with rectangular metal strips with different widths, the rectangular metal strips with different widths are electrically connected with a central metal strip II 5, and the rectangular corrugated groove line 4 with gradually changed depth gradually converts the rectangular metal strips into a 50 ohm TEM transmission line 7 to realize momentum matching. Two exponentially graded ground planes 6 are respectively arranged at two ends of the rectangular corrugated groove line 4 with the depth graded to realize conversion from a TEM mode to a TM mode, and the exponentially graded ground planes 6 meet an exponentially graded function y=f (x) =C 1 e ax +C 2 Wherein C 1 And C 2 And alpha is an exponential ramp coefficient, which is a fixed constant. CPW coplanar waveguides are respectively arranged at two ends of the flexible SSPPs microwave equalizing filter and are used for being interconnected with a traditional 50 ohm transmission line 7.
The low-pass cutoff frequency of the flexible SSPPs microwave equalizing filter is 7.6GHz, and the equalizing characteristic of a negative slope is realized in a passband. From 3.5GHz (IL= -3.2 dB) to 6.3GHz (IL= -13.5 dB), the transmission passband has an equalizing amount of-10 dB, the electronic system with 10dB amplitude difference can be subjected to amplitude equalization, and the average reflection coefficient in the passband is-18 dB. The rejection capability of the stop band above the cut-off frequency is better than-32 dB, and the out-of-band interference can be effectively suppressed.
The flexible SSPPs microwave equalizing filter of the invention mainly controls the amplitude equalizing value in the transmission passband of the filter by regulating and controlling the surface resistance of the rectangular corrugated ITO film strip 2; the ITO film is sputtered at the rectangular corrugated strip of the equalizing filter unit to realize low reflection coefficient in the passband; the transmission cut-off frequency of the filter is adjusted by adopting reasonable structural parameters and manually setting the width of the rectangular corrugated ITO film strip 2 during the manufacture of the filter. The filter is manufactured on the PET film, so that the filter can be flexibly assembled into a broadband electronic system structurally, the weight of electronic equipment is effectively reduced, and the assembly of high-density parts of the electronic system is realized.
When the rest parameters of the flexible SSPPs microwave equalizing filter are fixed, the amplitude equalizing value in the passband can be adjusted by setting the number N of the equalizing filter SSPPs units 1, and the larger the value of N is, the larger the amplitude equalizing value in the passband is.
The size parameter selection range of the flexible SSPPs microwave equalization filter is as follows: rectangular corrugated ITO film strip 2 width h=14+ -5 mm, length l 1 Surface resistance Z of rectangular corrugated ITO film strip 2 =1.5mm±1mm s =5 ohm/w±20ohm/W; the width w=1.4+ -1 mm and the length l=3 mm+ -1 mm of the central metal strip 3 between the two rectangular corrugated ITO film strips 2; the period p=6mm+2mm of the equalization filter SSPPs units 1, and the number N of the equalization filter SSPPs units 1 is more than or equal to 1. Width h of corrugated metal strip of depth-graded slot line 4 1 ＝3.91±1mm，h 2 ＝6.43±1mm，h 3 ＝8.95±1mm，h 4 Length l =11.47±1mm 3 =1.5mm±1mm, center metal bar 5 width w 2 Length l=1.4mm±1mm 2 =3mm±1mm, exponential gradation function parameter C 1 =0.5±0.02 and C 2 ＝2.7mm±0.2mm，α＝0.14±0.005,|x 2 -x 1 |＝25mm±0.5mm，|y 2 -y 1 |＝16.05mm±0.5mm。
When the flexible SSPPs microwave equalization filter is practically applied, according to different communication occasions and application requirements, parameters such as the surface resistance of the rectangular corrugated ITO film strips 2, the number N of the equalization filtering SSPPs units 1, the width of the rectangular corrugated ITO film strips 2 and the like are matched and selected, so that different amplitude equalization values and transmission cut-off frequencies in a filter band are controlled, and different application requirements are met.
Referring to fig. 3, the flexible SSPPs microwave equalizing filter of the present invention is applied to a receiver of a broadband wireless communication system, and the main structure of the receiver is that the receiver comprises a broadband antenna 8, wherein the broadband antenna 8 is sequentially connected with a first broadband low noise amplifier 9, a second gain amplifier 10, a broadband equalizing filter 11, a down-conversion circuit 12 and an intermediate frequency filter 13, a third gain amplifier 14 is connected with an a/D conversion 18, and the a/D conversion 18 is simultaneously connected with a microprocessor 19 and a memory 21 through a relevant channel 20; the reference crystal 15 is connected to the down-conversion circuit 12 (the other input terminal) through a frequency synthesizer 16, and the AGC block 17 is connected to the gain amplifier three 14.
The broadband antenna 8 and the broadband low noise amplifier 9 together form an antenna unit;
the second gain amplifier 10, the broadband equalizing filter 11, the down-conversion circuit 12, the intermediate frequency filter 13, the third gain amplifier 14, the reference crystal oscillator 15, the frequency synthesizer 16 and the AGC module 17 together form a down-conversion circuit unit;
the above-described a/D conversion 18, microprocessor 19, correlation channel 20 and memory 21 together constitute a baseband signal processing unit.
The broadband equalization filter 11 adopts the flexible SSPPs microwave equalization filter described in the present invention.
The first broadband low noise amplifier 9 is selected from LNA module QPL9503 of Qorvo company, the second gain amplifier 10 and the gain amplifier 14 are selected from ERA-3SM+ of Mini_circuit company, and the intermediate frequency filter 13 is selected from SXBP-29+ of Mini_circuit company.
The down-conversion circuit 12 is an LTC5555 of Analog company.
The baseband signal processing unit selects FMCJ457 analog digital acquisition board card and KC705E FPGA baseband processing card of Beijing Ether technology company.
The circuit modules or units are all system circuits, and other related specific models can be selected for combination design according to different application requirements.
The specific parameter settings of the flexible SSPPs microwave equalizing filter in this embodiment are: rectangular corrugated ITO film strip 2 width h=14 mm, length l 1 =1.5 mm, ITO film 3 surface resistance Z s =5 ohm/W; the width w=1.4 and the length l=3 mm of the central metal strip 3 between the two rectangular corrugated ITO film strips 2; the period p=6mm of the equalization-filter SSPPs units 1, the number N of the equalization-filter SSPPs units 1>1, the default number is set to 4. Width h of corrugated metal strip of depth gradient slot line 1 ＝3.91mm，h 2 ＝6.43mm，h 3 ＝8.95mm，h 4 Length l =11.47 mm 3 =1.5 mm, width w of central metal strip 5 2 Length l =1.4 mm 2 =3mm, exponential taper function parameter C 1 =0.5±0.02 and C 2 ＝2.7mm，α＝0.14,|x 2 -x 1 |＝25mm，|y 2 -y 1 |=16.05mm. The input-output coaxial connecting line is connected with the 50 ohm TEM transmission line I, the flexible SSPPs microwave equalizing filter has an equalizing amount of-10 dB in a transmission passband from 3.5GHz (IL= -3.2 dB) to 6.3GHz (IL= -13.5 dB), and can be used for carrying out amplitude equalization on an electronic system with 10dB amplitude difference, and the average reflection coefficient in the passband is-18 dB. The rejection capability of the stop band above the cut-off frequency is better than-32 dB, and the out-of-band interference can be effectively suppressed.
When the system works, firstly, the broadband antenna 8 receives weak electromagnetic signals, the signal power is amplified to a required level through the broadband low-noise amplifier I9 and the gain amplifier II 10 and then is sent to the broadband equalizing filter 11, and the broadband equalizing filter 11 compensates amplitude-frequency response in a broadband of the system and filters out-of-band interference signals and then enters the down-conversion circuit 12. Meanwhile, the signal of the reference crystal oscillator 15 (TCXO) also enters the down-conversion circuit 12 through the frequency synthesizer 16; the broadband radio frequency signal is down-converted to the intermediate frequency through the down-conversion circuit 12 according to different application requirements, and finally sent to the final baseband signal processing unit through the self-circulation loop of the intermediate frequency filter 13 and the gain amplifier three 14, and the baseband signal processing unit completes the processing work of the baseband signal.
Referring to fig. 4, which is a frequency response characteristic curve of the flexible SSPPs microwave equalizing filter according to the embodiment of the present invention, it can be seen from fig. 4 that the equalizing filter has an equalizing amount of-10 dB in a transmission passband of 3.5GHz to 6.3GHz, and can perform amplitude equalization for an electronic system with an amplitude difference of 10dB, and an average reflection coefficient in the passband is-18 dB. The rejection capability of the stop band above the cut-off frequency is better than-32 dB, and the out-of-band interference can be effectively suppressed.
The foregoing description is only illustrative of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, and all changes that may be made in the equivalent structures described in the specification and drawings of the present invention are intended to be included in the scope of the invention.
Claims (9)
1. A filter adopting rectangular corrugated metal strips to sputter ITO film to balance and filter SSPPs transmission lines is characterized in that: the rectangular corrugated metal strip sputtering ITO film equalization filtering SSPPs transmission line is formed by cascading basic equalization filtering SSPPs units (1), the equalization filtering SSPPs units (1) are formed by rectangular corrugated ITO film strips (2) and a first central metal strip (3), and a first central metal strip (3) is arranged at the central position between the two rectangular corrugated ITO film strips (2) which are arranged in parallel; the two ends of the equalization filtering SSPPs transmission line are respectively provided with a momentum matching converter, and the equalization filtering SSPPs transmission line is connected with the momentum matching converters through a TEM transmission line; the momentum matching converter is composed of a rectangular corrugated groove line (4) with gradually changed depth and an index gradual change ground plane (6), rectangular metal strips with different widths are respectively arranged at two ends of the rectangular corrugated groove line (4) with gradually changed depth, the rectangular metal strips with different widths are electrically connected with a center metal strip II (5), the rectangular corrugated groove line (4) with gradually changed depth gradually converts the rectangular metal strips into a 50 ohm TEM transmission line (7) to achieve momentum matching, and the two index gradual change ground planes (6) are respectively arranged at two ends of the rectangular corrugated groove line (4) with gradually changed depth to achieve conversion from a TEM mode to a TM mode.
2. The filter according to claim 1, wherein: the rectangular corrugated ITO film strip (2) is formed by sputtering by a radio frequency magnetron sputtering method or a direct current magnetron sputtering method; the surface resistance of the rectangular corrugated ITO film strip (2) is adjusted through sputtering power, sputtering time and oxygen concentration to realize different amplitude balance values in the passband of the filter; the position of the low-pass cut-off frequency of the filter is controlled by setting the width of the rectangular corrugated ITO film strip (2).
3. The filter according to claim 2, wherein: the first central metal strip (3) and the second central metal strip (5) are manufactured by inkjet printing of nano silver conductive particles.
4. A filter according to claim 3, characterized in that: in an equalization filter SSPPs transmission line, the number of equalization filter SSPPs cells is set between one and infinity.
5. The filter of claim 4, wherein: the depth of the rectangular corrugated groove line (4) with gradually changed depth is linearly increased from 0 to the groove depth value of the equalization filtering SSPPs unit through a plurality of times.
6. The filter of claim 5, wherein: the number of the equalization filter SSPPs units (1) is set according to actual use conditions, and the number is more than or equal to 1.
7. The filter of claim 6, wherein: the exponentially graded ground plane (6) satisfies an exponentially graded function y=f (x) =c 1 e ax +C 2 ，C 1 And C 2 And alpha is an exponential ramp coefficient, which is a fixed constant.
8. The filter of claim 7, wherein: the number of linear increases was five; the number of equalization filter SSPPs units (1) is four.
9. The filter of claim 8, wherein: rectangular corrugated ITO film strip (2) with width h=14+ -5 mm and length l 1 =1.5 mm±1mm, rectangular corrugated ITO film strip (2)Surface resistance Z S =5 ohm/w±20ohm/w; the width w=1.4+/-1 mm of the central metal strip I (3) between the two rectangular corrugated ITO film strips (2), and the length l=3 mm+/-1 mm; the period p=6mm+2mm of the equalization filtering SSPPs unit (1); width h of corrugated metal strip of rectangular corrugated groove line (4) with gradually changed depth 1 ＝3.91±1mm，h 2 ＝6.43±1mm，h 3 ＝8.95±1mm，h 4 Length l =11.47±1mm 3 =1.5 mm±1mm, center metal bar two (5) width w 2 Length l=1.4mm±1mm 2 =3mm±1mm; exponential progression function parameter C 1 =0.5±0.02 and C 2 ＝2.7mm±0.2mm，α＝0.14±0.005,|x 2 -x 1 |＝25mm±0.5mm，|y 2 -y 1 |＝16.05mm±0.5mm。
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