Bent line double-conductor miniaturized SSPPs band-pass equalization filter

Abstract

The invention relates to a bent-line double-conductor miniaturized SSPPs band-pass equalization filter, which overcomes the problems of a continuous period parasitic frequency band, structure miniaturization and the like existing outside a traditional microwave equalizer band in the prior art, further reduces the size, and is more beneficial to compact electronic system integration. The device comprises a bent line double-conductor miniaturized SSPPs equalization transmission line, the bent line double-conductor miniaturized SSPPs equalization transmission line is formed by cascading bent line double-conductor miniaturized SSPPs equalization units, and each bent line double-conductor miniaturized SSPPs equalization unit is composed of two mutually embedded open circuit bent lines, two rectangular metal strips, a surface resistor and a rectangular waveguide. The bending line double-conductor miniaturized SSPPs equalization unit is formed by transversely slotting a bending line open-circuit branch knot of the bending line double-conductor miniaturized SSPPs equalization unit and loading a surface resistor.

Description

Technical field:

[0001] The present invention belongs to the technical field of microwave bandpass equalizing filters. The present invention relates to a bandpass equalizing filter which is made of a microwave dielectric substrate and metal, works in a microwave frequency band and has both bandpass amplitude equalization and out-of-band interference filtering functions. The present invention relates to a bandpass equalizing filter which adopts a meander line dual-conductor miniaturized SSPPs equalizing transmission line. Background technology:

[0002] In current broadband wireless electronic communication systems, the amplitude fluctuation difference caused by electromagnetic space propagation, microwave device frequency response, etc. at different frequencies within the frequency band can reach up to 10dB. This uneven amplitude-frequency response can cause radio signal distortion, affect the signal-to-noise ratio of the fast Fourier transform, reduce the quality of digital signal demodulation of wireless devices, and increase the bit error rate. At present, this amplitude equalization is mostly processed in the digital domain, but this method will occupy a large amount of digital resources of digital devices when facing future broadband or ultra-wideband wireless communication applications, so it is necessary to put the amplitude equalization into the microwave domain for processing. Most of the current microwave amplitude equalizers use a resonant structure of a feeder loaded with discrete resistors and a quarter-wavelength resonant line, which has a continuous periodic parasitic response over the entire spectrum, so new methods are needed to improve the periodic parasitic response of the microwave amplitude equalizer.

[0003] Artificial surface plasmon polaritons (SSPPs) have natural high-frequency cutoff characteristics and good transmission characteristics such as field confinement, field enhancement effect, and low crosstalk. Therefore, they are widely used in the design of microwave devices, such as power dividers, combiners, couplers, filters, antennas, etc.

[0004] The high-frequency cutoff characteristics of artificial surface plasmons overcome the high-order parasitic effects of traditional microwave equalizers. If the two can be combined, in-band frequency response amplitude compensation can be performed while achieving in-band filtering. Therefore, the present invention proposes for the first time a meander line dual-conductor miniaturized SSPPs bandpass equalization filter to perform amplitude compensation for the frequency response of the RF link within the passband of the artificial surface plasmon bandpass filter. Summary of the invention:

[0005] The purpose of the present invention is to provide a meander line dual conductor miniaturized SSPPs bandpass equalization filter made by using a meander line dual conductor miniaturized SSPPs equalization transmission line, which overcomes the problems of continuous periodic parasitic bands existing outside the band of the traditional microwave equalizer and structural miniaturization in the prior art, further reduces the size, and is more conducive to compact electronic system integration. The present invention can further improve the working performance of the wireless communication system and the design efficiency of the new microwave device, realize bandpass filtering, and at the same time perform amplitude equalization on the frequency response within the passband.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A bandpass equalizing filter using a meander line dual-conductor miniaturized SSPPs equalizing transmission line, characterized in that: it comprises a meander line dual-conductor miniaturized SSPPs equalizing transmission line, the meander line dual-conductor miniaturized SSPPs equalizing transmission line is composed of a cascade of meander line dual-conductor miniaturized SSPPs equalizing units, the meander line dual-conductor miniaturized SSPPs equalizing unit is composed of a meander line, a rectangular metal strip, a surface resistor and a rectangular waveguide, two rectangular metal strips are arranged in parallel at both ends of the meander line, and the rectangular waveguide is arranged on the lower side of a dielectric substrate; the meander line dual-conductor miniaturized SSPPs equalizing transmission line is composed of a meander line, a rectangular metal strip, a surface resistor and a rectangular waveguide, two rectangular metal strips are arranged in parallel at both ends of the meander line, and the rectangular waveguide is arranged on the lower side of a dielectric substrate; Momentum matching converters are respectively arranged at both ends of the conductor miniaturized SSPPs balanced transmission line, and the meander line dual-conductor miniaturized SSPPs balanced transmission line is connected to the momentum matching converter through a TEM transmission line; the momentum matching converter is composed of a depth-gradient trapezoidal corrugated groove and a rectangular metal strip II, and a rectangular metal strip II with different widths is respectively arranged at both ends of the depth-gradient trapezoidal corrugated groove, and the depth-gradient trapezoidal corrugated groove line gradually converts the rectangular metal strip II to a 50-ohm TEM transmission line to achieve momentum matching, and realizes the conversion between TEM mode and TM mode.

[0008] The position of the lower edge cutoff frequency of the meander line dual-conductor miniaturized SSPPs bandpass equalizing filter is controlled by setting the groove depth of the meander line and the gap between the mutually interlocking parts; the position of the upper edge cutoff frequency of the meander line dual-conductor miniaturized SSPPs bandpass equalizing filter is adjusted by setting the groove depth of the meander line and the width of the meander line.

[0009] The depth of the gradually varying trapezoidal corrugated groove increases linearly multiple times, from 0 to the groove depth value of the meander line dual-conductor miniaturized SSPPs balancing unit.

[0010] Lateral grooves are made on the meander line dual-conductor miniaturized SSPPs equalizing unit, and surface resistance is introduced. The equalizing value of the bandpass equalizing filter is adjusted by changing the surface impedance.

[0011] In the meander line dual conductor miniaturized SSPPs balanced transmission line, the number of the meander line dual conductor miniaturized SSPPs balanced units is set between one and infinity.

[0012] The number of linear increases is three times; the number of balancing units of the meander line dual-conductor miniaturized SSPPs is four.

[0013] Among them, the width of the rectangular metal strip one is h = 0.5±0.1mm, the length is l1 = 0.75±0.1mm, the depth of the bending line groove is h0 = 1.75mm±0.1mm, the line width is w0 = 0.3±0.1mm, and the gap is g0 = 0.2±0.1mm; the period of the bending line dual-conductor miniaturized SSPPs unit is p = 3.7±1mm; the width of the corrugated metal strip with a depth-gradient trapezoidal corrugated groove line is h1 = 1.12±0.1mm, h2 = 1.91±0.1mm, h3 = 2.16±0.1mm, h4 = 2.95±0.1mm, h5 = 3.2±0.1mm, h6 = 4.0±0.1mm, and the length is l2 = 2.4±0.1mm; the width of the rectangular metal strip two is w3 = 1.12±0.1mm, the length is l3 = 4.6±0.1mm, and the surface resistance is R = 270ohm.

[0014] A meander line dual-conductor miniaturized SSPPs bandpass equalization filter is used in a broadband wireless communication system receiver.

[0015] Compared with the prior art, the meander line dual-conductor miniaturized SSPPs bandpass equalization filter provided by the present invention is as follows:

[0016] 1. The present invention proposes a meander line dual-conductor miniaturized SSPPs balanced transmission line, which is composed of a number of manually settable meander line dual-conductor miniaturized SSPPs balanced units connected in series, and the number of units is ≥1. The meander line dual-conductor miniaturized SSPPs balanced unit is composed of two mutually interlocking open-circuit meander lines, two rectangular metal strips, a surface resistor and a rectangular waveguide. By controlling the surface current path length of the meander line, the upper edge cutoff frequency position of the transmission line can be independently regulated; by controlling the capacitive coupling gap of the meander line, the lower edge cutoff frequency position of the transmission line can be independently regulated. Compared with the SSPPs hybrid circuit and multi-layer coupled SSPPs methods, the meander line dual-conductor miniaturized SSPPs balanced transmission line proposed by the present invention is used to manufacture a meander line dual-conductor miniaturized SSPPs bandpass balanced filter with a smaller volume and higher frequency selectivity, and at the same time has a flatter transmission coefficient and reflection coefficient in the passband, and the center operating frequency can be flexibly regulated by adjusting the meander line groove depth. Ultimately, the meander line dual-conductor miniaturized SSPPs balanced transmission line can achieve good transmission of surface electromagnetic energy, making the meander line dual-conductor miniaturized SSPPs bandpass balanced filter more convenient to integrate in compact electronic systems.

[0017] 2. The present invention includes a meander line dual-conductor miniaturized SSPPs bandpass equalization filter composed of a meander line dual-conductor miniaturized SSPPs equalization transmission line, a momentum matching structure, and a 50ohm microstrip line. By introducing surface resistance in the structure of the bandpass filter, amplitude equalization is achieved in the passband of the bandpass filter for the first time, and the equalization and passband are adjustable. The present invention proposes for the first time a meander line dual-conductor miniaturized SSPPs equalization transmission line. By transversely slotting the open end of the meander line and introducing surface resistance at the slot position, the transmission line can introduce a negative slope equalization characteristic; compared with the traditional microwave equalizer, the miniaturized SSPPs equalization transmission line composed of several such units can simultaneously achieve in-band amplitude equalization and out-of-band interference filtering, overcome the parasitic frequency band existing in the traditional microwave equalizer, and improve the periodic parasitic response introduced by the traditional microwave equalizer outside the passband of the broadband wireless electronic device. By controlling the surface resistance of the slot at the open end of the meander line, different amplitude balance values ​​in the passband of the meander line dual-conductor miniaturized SSPPs balanced transmission line can be achieved; by controlling the meander line slot depth, line width, and gap, the cutoff frequency position of the meander line dual-conductor miniaturized balanced SSPPs transmission line can be independently adjusted. Ultimately, the meander line dual-conductor miniaturized SSPPs balanced transmission line can achieve good transmission of surface electromagnetic energy, making the filter more conducive to integration in compact electronic systems.

[0018] 3. The meander line dual-conductor miniaturized SSPPs bandpass equalization filter proposed in the present invention is adopted. 1) In terms of electrical performance, it is the first time that bandpass amplitude equalization and out-of-band interference filtering are realized on the artificial surface plasmon bandpass filter, which improves the design efficiency of microwave devices and reduces the pressure on device resources when broadband systems perform amplitude equalization in the digital domain; 2) In terms of structure, it can be assembled into broadband electronic systems, effectively reducing the volume and weight of electronic equipment and realizing high-density component assembly of electronic systems. Description of the drawings:

[0019] Figure 1 It is a structural diagram of the meander line dual-conductor miniaturized SSPPs bandpass equalization filter of the present invention;

[0020] Figure 2 It is a schematic diagram of the installation structure of the meander line dual-conductor miniaturized SSPPs bandpass equalization filter of the present invention;

[0021] Figure 3 It is the frequency response characteristic curve of the meander line dual-conductor miniaturized SSPPs bandpass equalization filter of the present invention.

[0022] Figure 2Among them, 1. meander line dual-conductor miniaturized SSPPs equalizing unit, 2. meander line, 3. rectangular metal strip, 4. surface resistance, 5. depth-gradient trapezoidal corrugated slot line, 6. rectangular metal strip II, 7. 50 ohm TEM transmission line, 8. broadband antenna, 9. broadband low-noise amplifier I, 10. gain amplifier II, 11. meander line dual-conductor miniaturized SSPPs bandpass equalizing filter, 12. down-conversion circuit, 13. intermediate frequency filter, 14. gain amplifier III, 15. reference crystal oscillator, 16. frequency synthesizer, 17. AGC module, 18. A / D converter, 19. microprocessor, 20. related channels, 21. memory. Specific implementation method:

[0023] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] In view of the increasing demand for the integration of communication systems, the miniaturization and multifunctionality of radio frequency devices have become an important development trend. Therefore, the present invention proposes a meander line dual-conductor miniaturized SSPPs bandpass equalization filter.

[0025] The meander line dual-conductor miniaturized SSPPs balanced transmission line proposed in the present invention realizes different attenuation of electromagnetic energy at each frequency, i.e., the amount of balance, by introducing resistive loss in the area where electromagnetic energy at different frequencies resides; at the same time, combined with the cutoff characteristics of SSPPs, amplitude balance and interference filtering can be realized at the same time. The combination of the two functions of balance and filtering is not a simple linear addition in structure. To realize the independent quantization and control of the balanced filtering function at the same time, it is necessary to solve the problem of characteristic separation and quantification. It is necessary to carefully consider the parameters of the introduced surface resistance and the loading position and loading method in order to realize the SSPPs transmission line with balanced filtering characteristics.

[0026] The present invention is a meander line dual-conductor miniaturized SSPPs equalization filter, and the technical scheme adopted is: comprising a 50-ohm TEM transmission line, a momentum matching converter, and a meander line dual-conductor miniaturized SSPPs equalization transmission line, momentum matching converters are respectively arranged at both ends of the meander line dual-conductor miniaturized SSPPs equalization transmission line, and the meander line dual-conductor miniaturized SSPPs equalization transmission line and the momentum matching converter are connected through the 50-ohm TEM transmission line; the meander line dual-conductor miniaturized SSPPs equalization transmission line is composed of a basic meander line dual-conductor miniaturized SSPPs equalization unit, and the meander line dual-conductor miniaturized SSPPs equalization unit is a double-line structure. The meander line dual-conductor miniaturized SSPPs equalization unit is composed of a meander line, a rectangular metal strip, a patch resistor, and a rectangular waveguide, and two rectangular metal strips are electrically connected to two mutually interlocking open-circuit meander lines, and a transverse slot is made at the branch of the open-circuit end of the meander line to introduce a surface resistor, thereby realizing the function of equalization filtering. The introduction of surface resistance is achieved by loading chip resistors at the slots to achieve different amplitude equalization values ​​within the filter passband; at the same time, by loading chip resistors with different resistance values, performance reconstruction can be achieved in the same equalization filter. The position of the filter's low-pass cutoff frequency is controlled by artificially setting the surface current path length of the meander line; by controlling the capacitive coupling gap between the meander lines, the position of the lower edge cutoff frequency can be independently adjusted within a certain range. In the meander line dual-conductor miniaturized SSPPs equalization transmission line, the number of meander line dual-conductor miniaturized SSPPs equalization units can be artificially set between 1 and infinity, and the artificial adjustment of the amplitude equalization value within the passband of the meander line dual-conductor miniaturized SSPPs equalization filter can also be achieved. The momentum matching converter consists of a depth-gradient trapezoidal corrugated slot line, a rectangular metal strip, and a rectangular metal strip. The depth of the rectangular corrugated slot line increases linearly multiple times from 0 to the slot depth value of the meander line dual conductor miniaturized SSPPs balanced unit, and the present invention defaults to 3 times; the momentum matching converter can smoothly convert the TEM electromagnetic wave on the 50 ohm transmission line to the TM polarized surface wave, and at the same time realize the impedance matching between the input and output ports and the meander line dual conductor miniaturized SSPPs balanced transmission line. The 50 ohm TEM transmission line is composed of a microstrip line.

[0027] Example:

[0028] See also Figure 1 and Figure 2The zigzag line dual-conductor miniaturized SSPPs balanced bandpass filter of the present invention realizes frequency domain amplitude equalization and interference filtering both inside and outside the passband in terms of electrical performance; it realizes a miniaturized microwave equalization filter in terms of structure, which overcomes the problem of continuous periodic parasitic frequency band existing outside the band of the traditional microwave equalizer, and can not only solve the problem of large digital chip resources occupied by digital equalization processing of existing broadband wireless electronic systems, but also realizes bandpass amplitude equalization and out-of-band interference filtering on one microwave device at the same time. Its structure includes a 50 ohm TEM transmission line 7, a momentum matching converter, and a zigzag line dual-conductor miniaturized SSPPs balanced transmission line. The zigzag line dual-conductor miniaturized SSPPs balanced transmission line is composed of a cascade of basic zigzag line dual-conductor miniaturized SSPPs equalization units 1, and the number of zigzag line dual-conductor miniaturized SSPPs equalization units 1 can be manually set according to actual usage, the number ≥ 1, and the default setting is 4. The meander line dual-conductor miniaturized SSPPs equalization unit 1 is a dual-line structure, and is composed of a meander line 2, a rectangular metal strip 1 3, a rectangular waveguide, and a chip resistor. The two rectangular metal strips 1 3 are electrically connected to two mutually interlocked open-circuited meander lines 2. At the open-circuit end branches of the meander line 2, a transverse slot is made to introduce a surface resistor, thereby realizing the function of equalization filtering. The introduction of the surface resistor is realized by loading a chip resistor at the slot to realize different amplitude equalization values ​​within the passband of the meander line dual-conductor miniaturized SSPPs bandpass equalization filter; the surface current path length of the meander line 2 is artificially set to control the position of the lower edge cutoff frequency of the meander line dual-conductor miniaturized SSPPs bandpass equalization filter; by controlling the capacitive coupling gap between the meander lines, the position of the lower edge cutoff frequency can be independently adjusted within a certain range. Momentum matching converters are provided at both ends of the meander line dual-conductor miniaturized SSPPs balanced transmission line, respectively. The momentum matching converter is composed of a depth-gradient trapezoidal corrugated groove line 4 and a rectangular metal strip 2. The depth of the trapezoidal corrugated groove line 4 is increased linearly multiple times from 0 to the groove depth value of the meander line dual-conductor miniaturized SSPPs balanced unit. The depth-gradient trapezoidal corrugated groove line 4 gradually converts the rectangular metal strip to a 50 ohm TEM transmission line 6 to achieve momentum matching. The momentum matching converter can smoothly convert the TEM transmission wave on the 50 ohm transmission line to a TM-polarized surface wave, and at the same time realize the impedance matching between the input and output ports and the meander line dual-conductor miniaturized SSPPs balanced transmission line. The 50 ohm TEM transmission line is composed of a microstrip line.

[0029] The meander line dual-conductor miniaturized SSPPs bandpass equalization filter proposed by the present invention has a lower edge cutoff frequency of 4.3GHz and a low-pass cutoff frequency of 6.1GHz, and realizes a negative slope equalization characteristic in the passband. It has a -10dB equalization amount in the transmission passband from 4.5GHz (IL=-3.5dB) to 5.4GHz (IL=-13.5dB), and can perform amplitude equalization on electronic systems with a 10dB amplitude difference. The average reflection coefficient in the passband is -18dB. The stopband suppression capability above the cutoff frequency is better than -30dB, which can effectively suppress out-of-band interference.

[0030] The meander line dual-conductor miniaturized SSPPs bandpass equalization filter proposed in the present invention mainly controls the amplitude equalization value in the filter transmission passband by adjusting the chip resistor loaded on the meander line dual-conductor miniaturized SSPPs unit; realizes the low reflection coefficient in the passband by optimizing the momentum matching structure; and adjusts the transmission cutoff frequency of the meander line dual-conductor miniaturized SSPPs bandpass equalization filter by artificially setting the meander line width, gap, and surface current path length when manufacturing the meander line dual-conductor miniaturized SSPPs bandpass equalization filter by adopting reasonable structural parameters. The manufactured meander line dual-conductor miniaturized SSPPs bandpass equalization filter is assembled into a broadband electronic system, effectively reducing the volume and weight of the electronic equipment and realizing high-density component assembly of the electronic system.

[0031] The meander line dual-conductor miniaturized SSPPs bandpass equalizing filter of the present invention can also adjust the amplitude equalization value within the passband by setting the number N of the meander line dual-conductor miniaturized SSPPs equalizing units 1 when other parameters are fixed. The larger the N value is, the larger the amplitude equalization value within the passband is. At the same time, the meander line dual-conductor miniaturized SSPPs bandpass equalizing filter of the present invention can set the amplitude equalization value within the passband of the meander line dual-conductor miniaturized SSPPs equalizing unit by changing the resistance value of the loaded chip resistor when other parameters are fixed.

[0032] The size parameter selection range of the meander line dual-conductor miniaturized SSPPs bandpass equalization filter of the present invention is: the width of the rectangular metal strip (3) is h = 0.5 ± 0.1 mm, the length l1 is l = 0.75 ± 0.1 mm, the meander line (2) groove depth h0 is h = 1.75 mm ± 0.1 mm, the line width w0 is w = 0.3 ± 0.1 mm, and the gap g0 is g = 0.2 ± 0.1 mm; the period of the meander line dual-conductor miniaturized SSPPs equalization unit (1) is p = 3.7 ± 1 mm; the depth gradient The width of the corrugated metal strip of the trapezoidal corrugated groove line (5) is h1=1.12±0.1mm, h2=1.91±0.1mm, h3=2.16±0.1mm, h4=2.95±0.1mm, h5=3.2±0.1mm, h6=4.0±0.1mm, and the length is l2=2.4±0.1mm. The width of the rectangular metal strip II (6) is w3=1.12±0.1mm, the length is l3=4.6±0.1mm, and the surface resistance is R=270ohm.

[0033] When the meander line dual-conductor miniaturized SSPPs bandpass equalizing filter of the present invention is actually used, according to different communication occasions and application requirements, by matching and selecting parameters such as the resistance value of the loaded chip resistor, the number N of the meander line dual-conductor miniaturized SSPPs equalizing units 1, the meander line width, the gap, the surface current path length, etc., different amplitude equalization values ​​and transmission cutoff frequency controls within the filter band are achieved to meet different application requirements.

[0034] Reference Figure 2 The meander line dual-conductor miniaturized SSPPs bandpass equalization filter of the present invention is applied to a broadband wireless communication system receiver. The main structure of the receiver includes a broadband antenna 8, which is sequentially connected to a broadband low-noise amplifier 1 9, a gain amplifier 2 10, a meander line dual-conductor miniaturized SSPPs bandpass equalization filter 11, a down-conversion circuit 12, and an intermediate frequency filter 13. The gain amplifier 3 14 is connected to an A / D converter 18, and the A / D converter 18 is simultaneously connected to a microprocessor 19 and a memory 21 through a related channel 20; in addition, a reference crystal oscillator 15 is connected to the down-conversion circuit 12 (another input end) through a frequency synthesizer 16, and the gain amplifier 3 14 is connected to an AGC module 17.

[0035] The above-mentioned broadband antenna 8 and broadband low noise amplifier 9 together constitute an antenna unit;

[0036] The above-mentioned gain amplifier 2 10, meander line dual conductor miniaturized SSPPs bandpass equalization filter 11, down-conversion circuit 12, intermediate frequency filter 13, gain amplifier 3 14, reference crystal oscillator 15, frequency synthesizer 16 and AGC module 17 together constitute a down-conversion circuit unit;

[0037] The above-mentioned A / D converter 18, microprocessor 19, correlation channel 19 and memory 21 together constitute a baseband signal processing unit.

[0038] The broadband low noise amplifier 1 9 uses an LNA module QPL9503 from Qorvo, the gain amplifier 2 10 and the gain amplifier 3 14 use ERA-3SM+ from Mini_circuit, and the intermediate frequency filter 13 uses SXBP-29+ from Mini circuit.

[0039] The down-conversion circuit 12 uses LTC5555 from Analog.

[0040] The baseband signal processing unit uses the FMCJ457 analog digital acquisition board and KC705EFPGA baseband processing card from Beijing Taisu Technology Co., Ltd.

[0041] The above-mentioned circuit modules or units are all system circuits, and other relevant specific models can also be selected for combination design according to different application requirements.

[0042] The specific parameter settings of the meander line dual-conductor miniaturized SSPPs bandpass equalization filter in this embodiment are: the width of the rectangular metal strip (3) is h = 0.5 ± 0.1 mm, the length l1 = 0.75 ± 0.1 mm, the meander line (2) groove depth h0 = 1.75 mm ± 0.1 mm, the line width w0 = 0.3 ± 0.1 mm, the gap g0 = 0.2 ± 0.1 mm; the period of the meander line dual-conductor miniaturized SSPPs equalization unit (1) is p = 3.7 ± 1 mm; the depth gradient The corrugated metal strip of the trapezoidal corrugated groove line (5) has a width of h1=1.12±0.1mm, h2=1.91±0.1mm, h3=2.16±0.1mm, h4=2.95±0.1mm, h5=3.2±0.1mm, h6=4.0±0.1mm, and a length of l2=2.4±0.1mm. The width of the rectangular metal strip II (6) is w3=1.12±0.1mm, the length is l3=4.6±0.1mm, and the surface resistance is R=270ohm.

[0043] The input and output coaxial connection lines are connected to the 50-ohm TEM transmission line 7. The lower edge cutoff frequency of the meander line dual-conductor miniaturized SSPPs bandpass equalization filter is 4.3 GHz, and the upper edge cutoff frequency is 6.1 GHz. The negative slope equalization characteristic is achieved in the passband. The transmission passband from 4.5 GHz (IL = -3.5 dB) to 5.4 GHz (IL = -13.5 dB) has a -10 dB equalization amount, which can be used to perform amplitude equalization on electronic systems with a 10 dB amplitude difference. The average reflection coefficient in the passband is -18 dB. The stopband suppression capability above the cutoff frequency is better than -30 dB, which can effectively suppress out-of-band interference.

[0044] When the system is working, first, the broadband antenna 8 receives weak electromagnetic signals, and then amplifies the signal power to the required level through the broadband low noise amplifier 1 9 and the gain amplifier 2 10, and then sends it to the meander line dual conductor miniaturized SSPPs bandpass equalization filter 11. The meander line dual conductor miniaturized SSPPs bandpass equalization filter 11 compensates the amplitude-frequency response within the system wide band and filters out the out-of-band interference signal before entering the down-conversion circuit 12. At the same time, the signal of the reference crystal oscillator 16 (TCXO) also enters the down-conversion circuit 12 through the frequency synthesizer 17; then, according to different application requirements, the broadband RF signal is down-converted to the intermediate frequency through the down-conversion circuit 12, and then sent to the final baseband signal processing unit through the self-circulating loop of the intermediate frequency filter 13 and the gain amplifier 3 14, and the baseband signal processing unit completes the processing of the baseband signal.

[0045] Reference Figure 3 , is the frequency response characteristic curve of the meander line dual-conductor miniaturized SSPPs bandpass equalization filter according to the embodiment of the present invention, Figure 3 It can be seen that the meander line dual-conductor miniaturized SSPPs bandpass equalization filter has a -10dB equalization amount in the transmission passband from 4.5GHz to 5.4GHz, which can perform amplitude equalization on electronic systems with a 10dB amplitude difference, and the average reflection coefficient in the passband is -18dB. The stopband suppression capability above the cutoff frequency is better than -32dB, which can effectively suppress out-of-band interference.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any equivalent structural changes made using the contents of the description and drawings of the present invention should be included in the patent protection scope of the invention.

Claims

1. A meander line dual-conductor miniaturized SSPPs bandpass equalization filter, characterized in that: The invention comprises a meander line dual-conductor miniaturized SSPPs balanced transmission line, wherein the meander line dual-conductor miniaturized SSPPs balanced transmission line is composed of a cascade of meander line dual-conductor miniaturized SSPPs balanced units (1), the meander line dual-conductor miniaturized SSPPs balanced units (1) are composed of a meander line (2), a rectangular metal strip (3), a surface resistor (4) and a rectangular waveguide, two rectangular metal strips (3) are arranged in parallel at both ends of the meander line (2), and the rectangular waveguide is arranged on the lower side of a dielectric substrate; the two ends of the meander line dual-conductor miniaturized SSPPs balanced transmission line are divided into a plurality of parallel ... A momentum matching converter is separately provided, and the meander line dual-conductor miniaturized SSPPs balanced transmission line is connected to the momentum matching converter via a TEM transmission line; the momentum matching converter is composed of a depth-gradient trapezoidal corrugated groove (5) and a rectangular metal strip (6), and two rectangular metal strips (6) with different widths are respectively provided at both ends of the depth-gradient trapezoidal corrugated groove line (5), and the depth-gradient trapezoidal corrugated groove line (5) gradually converts the rectangular metal strip (6) into a 50-ohm TEM transmission line (7) to achieve momentum matching, and realizes the conversion between the TEM mode and the TM mode.

2. The meander line dual-conductor miniaturized SSPPs bandpass equalization filter according to claim 1, characterized in that: The bend line (2) is formed by two open-circuit bend lines interlocking with each other; the positions of the upper and lower edge cutoff frequencies of the filter are controlled by setting the groove depth of the bend line (2) and the gap between the interlocking parts; and the position of the upper edge cutoff frequency of the filter is controlled by setting the groove depth of the bend line (2) and the width of the bend line.

3. The meander line dual-conductor miniaturized SSPPs bandpass equalization filter according to claim 2, characterized in that: The depth of the gradually varying trapezoidal corrugated groove line (6) increases linearly for multiple times, from 0 to the groove depth value of the meander line dual-conductor miniaturized SSPPs equalization unit (1).

4. The meander line dual-conductor miniaturized SSPPs bandpass equalization filter according to claim 3, characterized in that: A lateral groove is formed on a meander line dual-conductor miniaturized SSPPs equalization unit (1), and a surface resistor is introduced, so that the equalization value of the meander line dual-conductor miniaturized SSPPs bandpass equalization filter can be adjusted by changing the surface resistor.

5. The meander line dual-conductor miniaturized SSPPs bandpass equalization filter according to claim 4, characterized in that: In the meander line dual conductor miniaturized SSPPs balanced transmission line, the number of the meander line dual conductor miniaturized SSPPs balanced units (1) is set between one and infinity.

6. The meander line dual-conductor miniaturized SSPPs bandpass equalization filter according to claim 5, characterized in that: The number of times the depth of the trapezoidal corrugation groove increases linearly is three times; the number of the meander line double-conductor miniaturized SSPPs units (1) is four.

7. The meander line dual-conductor miniaturized SSPPs bandpass equalization filter according to claim 7, characterized in that: The rectangular metal strip (3) has a width of h = 0.5 ± 0.1 mm, a length of l1 = 0.75 ± 0.1 mm, a groove depth of the bending line (2) of h0 = 1.75 mm ± 0.1 mm, a line width of w0 = 0.3 ± 0.1 mm, and a gap of g0 = 0.2 ± 0.1 mm; the period of the bending line dual-conductor miniaturized SSPPs unit (1) is p = 3.7 ± 1 mm; the corrugated metal strip width h of the depth-gradient trapezoidal corrugated groove line (5) is 1=1.12±0.1mm, h2=1.91±0.1mm, h3=2.16±0.1mm, h4=2.95±0.1mm, h5=3.2±0.1mm, h6=4.0±0.1mm, length l2=2.4±0.1mm, rectangular metal strip two (6) width w3=1.12±0.1mm, length l3=4.6±0.1mm, surface resistance R=270ohm.

8. An application of the meander line dual-conductor miniaturized SSPPs bandpass equalization filter as claimed in claim 1 in a receiver of a broadband wireless communication system.

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