CN104934664A - A high-selectivity submillimeter wave ultra wide band filter based on a vehicle-mounted radar system - Google Patents
A high-selectivity submillimeter wave ultra wide band filter based on a vehicle-mounted radar system Download PDFInfo
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- CN104934664A CN104934664A CN201510387789.5A CN201510387789A CN104934664A CN 104934664 A CN104934664 A CN 104934664A CN 201510387789 A CN201510387789 A CN 201510387789A CN 104934664 A CN104934664 A CN 104934664A
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Abstract
The invention discloses an ultra wide band filter applicable to a vehicle-mounted radar system, and belongs to the technical field of microwave millimeter waves. The high-selectivity submillimeter wave ultra wide band filter of the invention comprises a rectangular insulation medium substrate, a lower layer metal ground plate and upper layer metal patches. A resonator employs a rectangular patch with corner cuts to improve power capacity of the filter. The outer side is in cascade with folded half-wavelength stepped impedance resonator to raise an upper-stop-band suppression degree. An input and an output employ a pseudo-interdigital structure to increase coupling intensity, and a 0-degree electricity feeding form is employed to generate an extra transmission zero point so as to make sideband steeper and raise passband selectivity. The filter has a plurality of transmission zero points in an operating frequency range thereof, and the sideband is very steep. The group delay change scope is relatively small. The filter is low in cost, small in size, compact in structure, superior in performance, large in power capacity and convenient for integration and interconnection. The high-selectivity submillimeter wave ultra wide band filter is very suitable for the vehicle-mounted radar system.
Description
Technical field
The invention belongs to microwave and millimeter wave technical field, be specifically related to a kind of submillimeter wave micro band superwide band band pass filter.
Background technology
Filter is one of most important device in wireless communication system, under day by day crowded radio spectrum resources and complicated electromagnetic environment, more and more higher to the performance requirement of filter.Ultra broadband, with advantages such as its two-forty, low-power consumption, high security and antijamming capability are strong, has boundless application prospect and quite huge market value.The application of super-broadband tech in short-distance wireless communication field is have approved in February, 2002 from US Federal Communication Committee (FCC), for the ease of management, FCC band system of overfulfiling a production target is divided into 3 classes: 1 imaging system, 2 Vehicular radar systems (22-29GHz), 3 indoor ultra-broadband systems (3.1-10.6GHz) [Federal Communications Commission.Revision of part 15 of the commission ' srules regarding ultra-wideband transmission system first report and order [R] .Tech.Rep.ET:FCC.2002.], various UWB filter has occurred like the mushrooms after rain, a series of method for designing is proposed by domestic and international advanced scholar, as " microwave and wireless devices bulletin " (IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, VOL.19, NO.1, JANUARY 2009) describe and be a kind ofly carried in multimode resonator on a high impedance microstrip line to realize the ultra-wide band filter that passband is 2.8 – 10.6GHz with three groups of Stepped Impedance minor matters.(IEEE MICROWAVE ANDWIRELESS COMPONENTS LETTERS, VOL.24, NO.4, APRIL 2014) describes and a kind ofly utilizes micro-band-defect ground structure to be 2.8 to the ultra-wide band filters of 11.0GHz to design band connection frequency.For another example " electronics bulletin " (ELECTRONICS LETTERS 16th August 2012 Vol.48 No.17) utilize three wire cross coupled resonators and with opening, a bandwidth of the short circuit minor matters coupling microstrip transmission line design that load be 2.8 to 10.7GHz ultra-wide band filters.
Can see that the research of most ultra-wide band filter is based on indoor ultra-broadband system 3.1-10.6GHz frequency range.But but seldom have ripe research for the ultra-wide band filter in Vehicular radar system submillimeter wave frequency range (22-29GHz), topmost reason is that being difficult to realize precipitous crossing is with, and the stopband that height suppresses.Based on the problems referred to above, need the ultra-wide band filter of a kind of high selectivity and Wide stop bands, meet the high advantage suppressing stopband and precipitous passband transition band.
Summary of the invention
The object of the invention is for background technology deposit defect and bottleneck, propose that a kind of cost is low, volume is little, compact conformation, superior performance, power capacity are large, be convenient to the integrated and interconnected high-performance ultra-wide band filter that can be applied to Vehicular radar system, this filter is operated in the frequency range of 22.6-28.5GHz, in band, Insertion Loss is 20dB, and Out-of-band rejection degree reaches for 22dB until 52GHz.
The present invention adopts following technical scheme:
A kind of submillimeter wave micro band superwide band band pass filter, its structure as shown in Figure 1 and Figure 2, comprise insulation medium board 1, lower metal ground plate 7 and upper strata metal patch, described upper strata metal patch comprises identical " L " sheet metal 3,4 of two structures, rectangular metal paster 2 with two corner cuts and two interdigital metal patches 5,6 of puppet, metal patch 2,3,4 is resonant element, pseudo-interdigital metal patch 5,6 is respectively input, export structure, and two corner cuts of described rectangular metal paster 2 are positioned at the same cornerwise two ends of its rectangle; The interdigital metal patch 5,6 of described two puppets is divided into the left and right sides of rectangular metal paster 2, and is provided with interdigital one end respectively near one end of the non-corner cut of rectangular metal paster 2; Two " L " sheet metals 3,4 are divided into the left and right sides of rectangular metal paster 2, and a limit of " L " sheet metal is parallel with the respective side edge of rectangular metal paster 2, and another limit is stretched in the interdigital gap of the interdigital metal patch of puppet of respective side edge, forms interdigital aperture-coupled thus.
Filter of the present invention adopts pseudo-interdigital aperture-coupled.Rectangular patch carries out fluting makes degenerate mode be separated and produce power coupling.Two " L " type metal patches are half-wavelength step impedance resonator, and Main Function increases stop band loss, improves belt resistance inhibitor system.Two interdigital metal patches of puppet, adopting 0 degree of feed structure as input and output, is to produce transmission zero, increases sideband steepness, improves passband selectivity.
Compared with prior art, the present invention's design has the following advantages: whole filter adopts double-side copper-applying Rogers medium substrate to be made, and overall structure photoetching technique realizes processing, with low cost.Resonator adopts rectangular patch to improve the power capacity of filter, and outside cascade folds half-wavelength step impedance resonator, belt resistance inhibitor system in raising.Input and output adopt pseudo-interdigital structure to increase stiffness of coupling, and adopt 0 degree of feed form, produce extra transmission zero, make sideband more precipitous, thus improve passband selectivity.
Accompanying drawing explanation
Fig. 1 is the front schematic view of filter construction of the present invention.
Fig. 2 is the side schematic view of filter construction of the present invention.
Fig. 3 is embodiment of the present invention filter freguency response simulate and test result schematic diagram.
Fig. 4 is embodiment of the present invention flora of filters time delay simulation and test result schematic diagram.
Embodiment
With specific embodiment, structure of the present invention and effect are further described in more detail below.
Embodiment
The ultra-wide band filter structure that the present embodiment provides as shown in Figure 1 and Figure 2, comprises medium substrate 1, resonant element 2,3,4, input and output coupled structure 5,6 and metal ground plate 7.The long L=16.25mm of medium substrate 1, wide w=10.82mm, thickness h=0.254mm (choosing thin dielectric substrate is to suppress higher mode, and at 26GHz place media table ground roll on the impact of filter), medium substrate material is Rogers RT5880, and dielectric constant is 2.2; Upper strata metal patch and metal ground plate are copper, and thickness is 0.035mm; The length and width of rectangular patch 2 are respectively a=3.65mm, b=3.82mm corner cut width c=0.45mm, folded form half-wavelength SIR paster 3,4 structure is the same, and vertical portion length and width are respectively L1=2.69mm, W1=0.33mm, horizontal component length and width are respectively L2=1.71mm, W2=0.18mm; Paster 2 is slot-coupled with the coupled modes of paster 3,4, coupling space S1=0.11mm; Input/output structure adopts pseudo-interdigital aperture-coupled to increase stiffness of coupling, and adopts 0 degree of feed structure to produce transmission zero raising sideband steepness, and gap interval S 2=0.10mm, final structure size is 16.25mm × 10.82mm.
As shown in Figure 3, centre frequency is 25.5GHz in the frequency response of this filter, and passband is 22.6-28.5GHz, and in band, return loss is greater than 18dB, insertion loss is less than 1.5dB, is with outer loss to reach for 22dB until 52GHz.Group delay excursion as shown in Figure 4 maximum change is less than 0.8ns.
In sum, ultra-wide band filter of the present invention, structure is simple, easy processes and the application of function admirable, practical very applicable Vehicular radar system.
Claims (4)
1. a submillimeter wave micro band superwide band band pass filter, comprise insulation medium board (1), lower metal ground plate (7) and upper strata metal patch, it is characterized in that, described upper strata metal patch comprises identical " L " sheet metal (3,4) of two structures, rectangular metal paster (2) with two corner cuts and two interdigital metal patches of puppet (5,6), pseudo-interdigital metal patch (5), (6) are respectively input, export structure, and two corner cuts of described rectangular metal paster (2) are positioned at the same cornerwise two ends of its rectangle; Described two interdigital metal patches of puppet (5), (6) are divided into the left and right sides of rectangular metal paster (2), and are provided with interdigital one end respectively near one end of rectangular metal paster (2) non-corner cut; Two " L " sheet metals (3), (4) are divided into the left and right sides of rectangular metal paster (2), and a limit of " L " sheet metal is parallel with the respective side edge of rectangular metal paster (2), and another limit is stretched in the interdigital gap of the interdigital metal patch of puppet of respective side edge, forms interdigital aperture-coupled thus.
2. submillimeter wave micro band superwide band band pass filter according to claim 1, is characterized in that, described insulation medium board (1) material is Rogers RT5880.
3. submillimeter wave micro band superwide band band pass filter according to claim 1, is characterized in that, described two " L " type metal patches (3,4) are half-wavelength step impedance resonator.
4. submillimeter wave micro band superwide band band pass filter according to claim 1, it is characterized in that, upper strata metal patch and metal ground plate are copper, and thickness is 0.035mm.
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| CN107834136A (en) * | 2016-09-05 | 2018-03-23 | 南宁富桂精密工业有限公司 | Bandpass filter |
| CN108493589A (en) * | 2018-05-17 | 2018-09-04 | 华南理工大学 | A kind of filter antenna for wearable device |
| CN114915276A (en) * | 2022-05-11 | 2022-08-16 | 西南交通大学 | Amplitude limiting filtering structure for radio frequency front end electromagnetic protection |
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| CN108493589A (en) * | 2018-05-17 | 2018-09-04 | 华南理工大学 | A kind of filter antenna for wearable device |
| CN108493589B (en) * | 2018-05-17 | 2024-05-07 | 华南理工大学 | Filtering antenna for wearable equipment |
| CN114915276A (en) * | 2022-05-11 | 2022-08-16 | 西南交通大学 | Amplitude limiting filtering structure for radio frequency front end electromagnetic protection |
| CN114915276B (en) * | 2022-05-11 | 2023-11-10 | 西南交通大学 | Amplitude limiting filter structure for electromagnetic protection of radio frequency front end |
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