CN105186080A - Half-mode substrate integrated waveguide band-pass filter - Google Patents
Half-mode substrate integrated waveguide band-pass filter Download PDFInfo
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- CN105186080A CN105186080A CN201510444468.4A CN201510444468A CN105186080A CN 105186080 A CN105186080 A CN 105186080A CN 201510444468 A CN201510444468 A CN 201510444468A CN 105186080 A CN105186080 A CN 105186080A
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Abstract
The invention provides a miniaturized ultra-wide stopband half-mode substrate integrated waveguide band-pass filter, which belongs to the technical field of microwaves and millimeter waves. The half-mode substrate integrated waveguide band-pass filter comprises a half-mode substrate integrated waveguide unit and defected microstrip feeders at both ends, loads electromagnetic band-gap structures and composite left-right-hand structures through the half-mode substrate integrated waveguide, so that the filter is small in size and compact in structure, and can be applied to many communication systems. In addition, the half-mode substrate integrated waveguide band-pass filter adopts the defected microstrip impedance tapered lines as the input and output feeders, effectively suppresses out-of-band harmonic waves, greatly broadens stopband bandwidth of the filter, and shows the ultra-wide stopband feature. The half-mode substrate integrated waveguide band-pass filter ensures the stopband bandwidth, and has excellent performance in aspects of insertion loss, return loss, selectivity and the like.
Description
Technical field
The invention belongs to microwave and millimeter wave field, be specifically related to a kind of ultra-wide stopband half module substrate integrated wave guide band pass filter.
Background technology
In modern wireless communication systems, band pass filter is widely used as an important part.Face the future intelligentized wireless communications application demand, and modern microwave communication system it is also proposed higher requirement to the performance of band pass filter and structure.On the one hand, not only require that they have and be with internal characteristic preferably, as low insertion loss, high selectivity etc., but also to have Wide stop bands even ultra-wide stopband to suppress the impact of high order harmonic component radio frequency front end.On the other hand, along with the development of integrated circuit technique, the volume of transceiver reduces increasingly, and under the requirement of this trend, the Miniaturization Research of filter just more and more becomes the focus of research.
Substrate integration wave-guide is a kind of novel waveguide structure proposed in recent years.Filter based on substrate integration wave-guide can not only keep high quality factor, the characteristic such as filter with low insertion loss and Low emissivity of traditional rectangular waveguide filter, but also the volume with planar circuit structure (microstrip line etc.) little, lightweight, be convenient to the many merits such as integrated and encapsulation.Half module substrate integrated wave guide is while maintaining substrate integration wave-guide transmission characteristic, and its size reduces half, and structure is more compact, and integrated level is higher.Therefore, half module substrate integrated wave guide has absolute predominance at mini filter design aspect.But due to the existence of higher mode, the band pass filter based on substrate integration wave-guide and half module substrate integrated wave guide is difficult to the inhibition obtaining Wide stop bands.And the band pass filter that realizes of electromagnetic bandgap structure, composite left-and-right-hand structure and half module substrate integrated wave guide technology being combined can their advantage comprehensive to a certain extent, effectively improve Out-of-band rejection characteristic, be therefore subject to extensive concern in the recent period.
Summary of the invention
Main purpose of the present invention adopts a kind of composite left-and-right-hand half module substrate integrated wave guide and electromagnetic bandgap structure, and realize a kind of band pass filter of miniaturized ultra-wide stopband, this filter can be used to high data rate communication systems radio-frequency front-end.
The present invention is concrete by the following technical solutions:
A kind of miniaturized ultra-wide stopband half module substrate integrated wave guide band pass filter, its structure as depicted in figs. 1 and 2, be followed successively by underlying metal paster 1, medium substrate 2 and top-level metallic paster from the bottom to top, described top-level metallic paster comprises the trapezoidal metal patch 4 of rectangular metal paster 3, two and two electromagnetic bandgap structures 9;
Described medium substrate 2 is provided with the plated-through hole array 5 through metal patch 1, medium substrate 2 and rectangular metal paster 3, described plated-through hole array 5 surrounds a half module substrate integrated wave guide with the lower limb of metal patch 1 and metal patch 3; Broadside one end of described two trapezoidal metal patches 4 is respectively input, the output port of this filter, and its other end is connected with the rectangular metal paster 3 at described half module substrate integrated wave guide two ends respectively; Described two trapezoidal metal patches 4 are respectively equipped with the more than one line of rabbet joint 6;
The middle part of rectangular metal paster 3 part of described half module substrate integrated wave guide is provided with an interdigital capacitor 7 in finger cross-like; In two outer fixs of interdigital capacitor 7, be respectively arranged with an electromagnetic bandgap structure 9; Described electromagnetic bandgap structure 9 handbag draws together one section of metal tape and one piece of metal patch, one end of described metal tape is connected with the lower limb of rectangular metal paster 3, its other end is connected with described metal patch, because metal tape is narrower, each electromagnetic bandgap structure 9 can be made to be similar to and to be carried on a point of rectangular metal paster 3 lower limb.
The actual number of the line of rabbet joint 6 set on described trapezoidal metal patch 4 can be selected according to the stopband band limits that will design; Described interdigital capacitor 7 can refer to line number arbitrarily, refer to line width and refer to line interval according to project organization employing.
In adjustment half module substrate integrated wave guide rectangular metal paster 3 and electromagnetic bandgap structure 9 dimension adjustable described in the operating frequency of filter.
Thus, described half module substrate integrated wave guide can be equivalent to and comprise half module substrate integrated wave guide unit and the composite left-and-right-hand half module substrate integrated wave guide unit that two load electromagnetic bandgap structure.
Described composite left-and-right-hand half module substrate integrated wave guide unit comprises half module substrate integrated wave guide and the interdigital capacitor etched in half module substrate integrated wave guide top-level metallic surface is formed; its cellular construction has and presents left hand passband at low frequency, presents the transmission characteristic of right hand passband at high frequency.
Further; on described rectangular metal paster 3; the line of rabbet joint 8 perpendicular to metal patch 3 lower limb is respectively arranged with at two side positions of interdigital capacitor 7; for weakening the stiffness of coupling between half module substrate integrated wave guide unit and composite left-and-right-hand half module substrate integrated wave guide unit loading electromagnetic bandgap structure, the size of described half module substrate integrated wave guide can be reduced further.
Further, the described line of rabbet joint 8 can adopt the line of rabbet joint or the stepped impedance line of rabbet joint of even width, and according to stepped impedance form, then its high impedance one end is connected to the lower limb of rectangular metal paster 3.
Further, described plated-through hole array 5 is cylinder, rectangle or other conventional shape of through holes.
Further, the metal patch in electromagnetic bandgap structure 9 is rectangle or other conventional patch shape.
In described miniaturized ultra-wide stopband half module substrate integrated wave guide band pass filter; the half module substrate integrated wave guide unit of each loading electromagnetic bandgap structure is regarded as a resonant element, and middle composite left-and-right-hand half module substrate integrated wave guide unit is also regarded as a resonant element.Adjustment is carried in the metal patch size of the electromagnetic bandgap structure on half module substrate integrated wave guide open circuit limit, can determine the resonance frequency of the half module substrate integrated wave guide unit loading electromagnetic bandgap structure.By regulating gap length and the number of the interdigital capacitor that half module substrate integrated wave guide etches, the resonance frequency of composite left-and-right-hand half module substrate integrated wave guide unit can be determined.There is coupling mutually between each resonant element, finally realize the transmission characteristic of band pass filter.
One of key technical problems of described miniaturized ultra-wide stopband half module substrate integrated wave guide band pass filter is to solve the coupled problem between the half module substrate integrated wave guide unit of loading electromagnetic bandgap structure and composite left-and-right-hand half module substrate integrated wave guide unit, determines the key structural parameters affecting filter transfer characteristic.The present invention by etching the stepped impedance line of rabbet joint between the half module substrate integrated wave guide unit loading electromagnetic bandgap structure and composite left-and-right-hand half module substrate integrated wave guide unit; weaken the half module substrate integrated wave guide unit and being coupled and coupling between two electromagnetic bandgap structures between composite left-and-right-hand half module substrate integrated wave guide unit that load electromagnetic bandgap structure simultaneously, make whole filter construction compacter.
Two of the key technical problems of described miniaturized ultra-wide stopband half module substrate integrated wave guide band pass filter is the suppression problem of high-frequency harmonic.The present invention etches four line of rabbet joint and forms defect microstrip feed line in micro-band impedance tapered line, by regulating the length of four line of rabbet joint, can form the stopband characteristic in broad frequency range, greatly expanding the stopband range of filter.
Compared with prior art, its advantage and beneficial effect are in the present invention:
1) the present invention adopts half module substrate integrated wave guide Technology design filter, and relative to the filter of traditional rectangular waveguide and transmission line structure, it has that loss is low, quality factor are high and is easy to the advantage such as integrated.And half module substrate integrated wave guide is compared with traditional substrate integration wave-guide, while maintaining substrate integration wave-guide transmission characteristic, size reduces half, and structure is more compact, and integrated level is higher;
2) adopt half module substrate integrated wave guide to load electromagnetic bandgap structure and composite left-and-right-hand structure, make filter size little, compact conformation, simplicity of design, cost is low, is applicable to plurality of communication systems;
3) adopt defect micro-band impedance tapered line as the input and output feeder line of filter, effectively inhibit the outer harmonic wave of band, greatly the broadening bandwidth of rejection of filter, represents ultra-wide stopband characteristic;
4) this filter is while guarantee ultra-wide stopband, and there is outstanding performance the aspects such as insertion loss, return loss and selectivity.
Accompanying drawing explanation
Fig. 1 is miniaturized ultra-wide stopband half module substrate integrated wave guide bandpass filter structures vertical view;
Fig. 2 is miniaturized ultra-wide stopband half module substrate integrated wave guide bandpass filter structures upward view;
Fig. 3 is the physical dimension figure on the top-level metallic surface of miniaturized ultra-wide stopband half module substrate integrated wave guide band pass filter;
Fig. 4 is miniaturized ultra-wide stopband half module substrate integrated wave guide band pass filter broadband range transfer curve;
Fig. 5 is miniaturized ultra-wide stopband half module substrate integrated wave guide band pass filter narrow bandwidth range transfer curve.
Embodiment
Below in conjunction with drawings and Examples, describe technical scheme of the present invention in detail.
This embodiment provides a kind of miniaturized ultra-wide stopband half module substrate integrated wave guide band pass filter, its structure as depicted in figs. 1 and 2, be followed successively by underlying metal surface, dielectric layer and top-level metallic surface from the bottom to top, described underlying metal surface is metal patch 1; Described dielectric layer is medium substrate 2; Described top-level metallic surface comprises the trapezoidal metal patch of rectangular metal paster 3, two 4, two electromagnetic bandgap structures 9;
Described medium substrate 2 is provided with the plated-through hole array 5 through metal patch 1, medium substrate 2 and rectangular metal paster 3, described plated-through hole array 5 surrounds a half module substrate integrated wave guide with the lower limb of metal patch 1 and metal patch 3; Broadside one end of described two trapezoidal metal patches 4 is respectively input, the output port of this filter, and its other end is connected with the rectangular metal paster 3 at described half module substrate integrated wave guide two ends respectively; Described two trapezoidal metal patches 4 are respectively equipped with the more than one line of rabbet joint 6, regulate the length of the described line of rabbet joint 6 can realize the suppression of high order harmonic component;
The middle part of rectangular metal paster 3 part of described half module substrate integrated wave guide is provided with an interdigital capacitor 7 in finger cross-like; At two side positions of interdigital capacitor 7, on described rectangular metal paster 3, be respectively arranged with the line of rabbet joint 8 perpendicular to metal patch 3 lower limb; The described line of rabbet joint 8 is the stepped impedance line of rabbet joint, and wherein high impedance one end is connected to the lower limb of rectangular metal paster 3; In two outer fixs of the line of rabbet joint 8, be respectively arranged with an electromagnetic bandgap structure 9; Described electromagnetic bandgap structure 9 comprises one section of metal tape and one piece of metal patch, one end of metal tape is connected with the lower limb of rectangular metal paster 3, its other end with say that described metal patch is connected, because metal tape is narrower, each electromagnetic bandgap structure 9 is similar to and is carried on a point of rectangular metal paster 3 lower limb.
In this embodiment, the number of the line of rabbet joint 6 set on each trapezoidal metal patch 4 is 4, and its actual number can select the number of the line of rabbet joint according to the stopband band limits that will design; Described interdigital capacitor 7 has 7 to refer to line, and refers to line width and refer to that line interval is equal, but is not limited to this, also can refer to line number arbitrarily, refer to line width and refer to line interval according to project organization employing; The described line of rabbet joint 8 also can adopt the line of rabbet joint of even width to replace the stepped impedance line of rabbet joint; Described plated-through hole array 5 is cylinder, and the metal patch in electromagnetic bandgap structure 9 is rectangle, also can adopt other shape.
Embodiment
The present embodiment provides a kind of miniaturized ultra-wide stopband half module substrate integrated wave guide band pass filter, and as shown in Figures 1 and 2, medium substrate 2 adopts thickness to be the Rogersduroid5880 substrate of 0.787mm to its structure, its relative dielectric constant ε
r=2.2, losstangenttanδ=0.0009; Wherein, the number of set on each trapezoidal metal patch 4 line of rabbet joint 6 is 4; Described interdigital capacitor 7 has 7 to refer to line, and refers to line width and refer to that line interval is equal; Described plated-through hole array 5 is cylinder via-hole array, and the metal patch in electromagnetic bandgap structure 9 is rectangle.
The through-hole diameter of plated-through hole array 5 is 0.8mm, and via clearance is 0.75mm.As shown in Figure 3, concrete corresponding parameter is as shown in the table for the concrete structure dimension mark of this kind of miniaturized ultra-wide stopband half module substrate integrated wave guide band pass filter:
As shown in Figure 4 and Figure 5, wherein Fig. 4 is the transmission characteristic of broadband range to the test result of miniaturized ultra-wide stopband half module substrate integrated wave guide band pass filter, and Fig. 5 is the transmission characteristic of narrow bandwidth range.As can be seen from test result; the centre frequency of a kind of miniaturized ultra-wide stopband half module substrate integrated wave guide band pass filter of the present invention is 5GHz; relative bandwidth 7.6%; logical in-band insertion loss absolute value is lower than 1.8dB; return loss absolute value is greater than 15dB;-20dB stopband suppresses from 5.4GHz, is up to 51.5GHz, is equivalent to 10.3 times of centre frequency.Whole filter is of a size of 20.3 × 8.6 × 0.787mm
3, much smaller than traditional half-modular substrate integral wave guide filter.
Therefore, one of the present invention miniaturized ultra-wide stopband half module substrate integrated wave guide band pass filter, all has outstanding performance, especially in bandwidth of rejection from aspects such as band-pass behavior, bandwidth of rejection and volumes.
Claims (7)
1. a miniaturized ultra-wide stopband half module substrate integrated wave guide band pass filter, be followed successively by underlying metal paster (1), medium substrate (2) and top-level metallic paster from the bottom to top, described top-level metallic paster comprises rectangular metal paster (3), two trapezoidal metal patches (4) and two electromagnetic bandgap structures (9);
It is characterized in that, described medium substrate (2) is provided with the plated-through hole array (5) through metal patch (1), medium substrate (2) and rectangular metal paster (3), described plated-through hole array (5) surrounds a half module substrate integrated wave guide with the lower limb of metal patch (1) and metal patch (3); Broadside one end of described two trapezoidal metal patches (4) is respectively input, the output port of this filter, and its other end is connected with the rectangular metal paster (3) at described half module substrate integrated wave guide two ends respectively; Described two trapezoidal metal patches (4) are respectively equipped with the more than one line of rabbet joint (6);
The middle part of the rectangular metal paster (3) of described half module substrate integrated wave guide is provided with an interdigital capacitor (7); Two side positions of interdigital capacitor (7) are loaded with an electromagnetic bandgap structure (9) respectively; Described electromagnetic bandgap structure (9) comprises one section of metal tape and one piece of metal patch, and one end of described metal tape is connected with the lower limb of rectangular metal paster (3), and its other end is connected with described metal patch.
2. miniaturized ultra-wide stopband half module substrate integrated wave guide band pass filter according to claim 1; it is characterized in that, the operating frequency of filter described in the dimension adjustable adjusting rectangular metal paster (3) and electromagnetic bandgap structure (9) in described half module substrate integrated wave guide.
3. miniaturized ultra-wide stopband half module substrate integrated wave guide band pass filter according to claim 1; it is characterized in that; on described rectangular metal paster (3), be respectively arranged with the line of rabbet joint (8) perpendicular to metal patch (3) lower limb at two side positions of interdigital capacitor (7).
4. miniaturized ultra-wide stopband half module substrate integrated wave guide band pass filter according to claim 3, it is characterized in that, the described line of rabbet joint (8) can adopt the line of rabbet joint or the stepped impedance line of rabbet joint of even width.
5. miniaturized ultra-wide stopband half module substrate integrated wave guide band pass filter according to claim 4; it is characterized in that; the described line of rabbet joint (8) adopts the stepped impedance line of rabbet joint, and its high impedance one end is connected to the lower limb of rectangular metal paster (3).
6. miniaturized ultra-wide stopband half module substrate integrated wave guide band pass filter according to claim 1, is characterized in that, described plated-through hole array (5) is cylinder or rectangular metal via-hole array.
7. miniaturized ultra-wide stopband half module substrate integrated wave guide band pass filter according to claim 1, it is characterized in that, the metal patch in described electromagnetic bandgap structure (9) is rectangular metal paster.
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| CN201510444468.4A CN105186080A (en) | 2015-07-27 | 2015-07-27 | Half-mode substrate integrated waveguide band-pass filter |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105655673A (en) * | 2016-03-18 | 2016-06-08 | 电子科技大学 | Medium loaded half-mode substrate integrated waveguide band-pass filter |
| CN106058390A (en) * | 2016-07-08 | 2016-10-26 | 桂林电子科技大学 | Terahertz band-stop filter for adjustment through electrostatic driving |
| CN107508038A (en) * | 2017-07-13 | 2017-12-22 | 中国人民解放军空军工程大学 | Work in the double-frequency micro-strip antenna battle array and its design method of C-band and X-band |
| CN109066024A (en) * | 2018-08-13 | 2018-12-21 | 电子科技大学 | A kind of big frequency based on mode composite transmission line compares double-passband filter |
| CN110729538A (en) * | 2019-11-07 | 2020-01-24 | 电子科技大学 | Miniaturized ultra wide band-pass filter with reconfigurable trapped wave band |
| CN111129675A (en) * | 2019-12-30 | 2020-05-08 | 西安石油大学 | Wide stop band suppression broadband filter |
| CN114824702A (en) * | 2022-05-13 | 2022-07-29 | 南京邮电大学 | Miniaturized ultra-wideband ultra-wide stop band planar band-pass filter |
| WO2023016360A1 (en) * | 2021-08-09 | 2023-02-16 | 南京邮电大学 | Hmcsiw dual-bandpass filter loaded with l-shaped stubs |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201936973U (en) * | 2010-12-31 | 2011-08-17 | 天津职业技术师范大学 | Micro-strip band pass filter with parasitic passband suppression structure |
| US8305164B1 (en) * | 2009-06-09 | 2012-11-06 | The United States Of America, As Represented By The Secretary Of The Navy | Frequency-agile frequency-selective variable attenuator |
| CN202977715U (en) * | 2012-09-27 | 2013-06-05 | 天津职业技术师范大学 | Miniature ultra-wideband antenna with double trap wave characteristics |
-
2015
- 2015-07-27 CN CN201510444468.4A patent/CN105186080A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8305164B1 (en) * | 2009-06-09 | 2012-11-06 | The United States Of America, As Represented By The Secretary Of The Navy | Frequency-agile frequency-selective variable attenuator |
| CN201936973U (en) * | 2010-12-31 | 2011-08-17 | 天津职业技术师范大学 | Micro-strip band pass filter with parasitic passband suppression structure |
| CN202977715U (en) * | 2012-09-27 | 2013-06-05 | 天津职业技术师范大学 | Miniature ultra-wideband antenna with double trap wave characteristics |
Non-Patent Citations (2)
| Title |
|---|
| ALONSO CORONA-CHAVEZ 等: ""Novel Miniaturized Triplexer Using Substrate Integrated Technology"", 《PROCEEDINGS OF ASIA-PACIFIC MICROWAVE CONFERENCE 2010》 * |
| 张巧利: ""基于复合左右手传输线和基片集成波导的无源器件研究"", 《中国博士学位论文全文数据库》 * |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105655673A (en) * | 2016-03-18 | 2016-06-08 | 电子科技大学 | Medium loaded half-mode substrate integrated waveguide band-pass filter |
| CN105655673B (en) * | 2016-03-18 | 2019-02-15 | 电子科技大学 | A kind of coated by dielectric half module substrate integrated wave guide bandpass filter |
| CN106058390A (en) * | 2016-07-08 | 2016-10-26 | 桂林电子科技大学 | Terahertz band-stop filter for adjustment through electrostatic driving |
| CN106058390B (en) * | 2016-07-08 | 2018-09-11 | 桂林电子科技大学 | A kind of Terahertz bandstop filter being adjusted by electrostatic drive |
| CN107508038A (en) * | 2017-07-13 | 2017-12-22 | 中国人民解放军空军工程大学 | Work in the double-frequency micro-strip antenna battle array and its design method of C-band and X-band |
| CN109066024A (en) * | 2018-08-13 | 2018-12-21 | 电子科技大学 | A kind of big frequency based on mode composite transmission line compares double-passband filter |
| CN109066024B (en) * | 2018-08-13 | 2023-12-22 | 电子科技大学 | Large-frequency-ratio double-passband filter based on mode composite transmission line |
| CN110729538A (en) * | 2019-11-07 | 2020-01-24 | 电子科技大学 | Miniaturized ultra wide band-pass filter with reconfigurable trapped wave band |
| CN111129675A (en) * | 2019-12-30 | 2020-05-08 | 西安石油大学 | Wide stop band suppression broadband filter |
| WO2023016360A1 (en) * | 2021-08-09 | 2023-02-16 | 南京邮电大学 | Hmcsiw dual-bandpass filter loaded with l-shaped stubs |
| CN114824702A (en) * | 2022-05-13 | 2022-07-29 | 南京邮电大学 | Miniaturized ultra-wideband ultra-wide stop band planar band-pass filter |
| CN114824702B (en) * | 2022-05-13 | 2023-12-08 | 南京邮电大学 | Miniaturized ultra-wideband stop band plane band-pass filter |
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Application publication date: 20151223 |