CN101217209B - A substrate integration waveguide multi-mode filter based on square high order cavity - Google Patents

A substrate integration waveguide multi-mode filter based on square high order cavity Download PDF

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CN101217209B
CN101217209B CN2008100190617A CN200810019061A CN101217209B CN 101217209 B CN101217209 B CN 101217209B CN 2008100190617 A CN2008100190617 A CN 2008100190617A CN 200810019061 A CN200810019061 A CN 200810019061A CN 101217209 B CN101217209 B CN 101217209B
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cavity
plated
hole array
filter
metal
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CN101217209A (en
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董元旦
洪伟
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Southeast University
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Southeast University
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Abstract

The invention relates to a substrate integrated multi-mode filter which is based on a square high-order mode cavity, the upper surface and the lower surface of a medium substrate (1) are respectively coated with an upper surface metal (7) and a lower surface metal (8), a metalizing through hole array (2) penetrates the medium substrate (1), the upper surface metal (7) and the lower surface metal (8); a first inductive column (3) and a second inductive column (4) which can play the roles of regulating the eigenfrequency of different modes and coupling between the modes are positioned in a square cavity which is surrounded by the metalizing through hole array (2); a first metal column inductive window (7) and a second metal column inductive window (8) are respectively arranged on the adjacent two sides of the square cavity, the cavity can realize the coupling of the input and the output of energy by metal column inductive windows; a first metalizing through hole array (5) and a second metalizing through hole array (6) are respectively positioned at the first metal column inductive window (7) and the second metal column inductive window (8) to be corresponding to the input and the output of the cavity of the filter, which are connected with an external circuit.

Description

Substrate integration waveguide multi-mode filter based on square high order cavity
Technical field
The present invention relates to a kind of wave filter technology that is applied in the fields such as millimetre-wave circuit, dual-use communication system, such filter adopts substrate integration wave-guide (Substrate Integrated Waveguide SIW) higher mode square cavity and combines the multimode technology, be particularly suitable for high frequency, high-performance also will realize the application scenario that the plane is integrated with system.
Background technology
Traditional millimeter wave filter adopts waveguide or microstrip line construction usually, but the shortcoming that they respectively have some to be difficult to overcome.For the planar structure filter of little band or strip line and so on, it is little that they have a volume, processes advantages such as simple, but exist power capacity low, and loss is big, because of shortcomings such as structure opening inconvenience sealings, thereby only is applicable to low frequency, the Circuits System that power is little.Waveguide class filter power capacity height, loss is low, excellent performance, but processing cost height, and be not suitable for modern planar circuit integrated.Substrate integration wave-guide (SIW) combines both advantages to a certain extent, when keeping conventional waveguide filter high power capacity, low-loss advantage, has also kept the general closed planar line filter and has been easy to integrated, lightweight, easy advantage such as processing.Filter based on substrate integrated waveguide technology can realize that processing cost is low with common PCB technology, and fabrication cycle is short, and its principle realizes that with metallized periodicity through hole alternative metals wall the general manufacturing limit of plated-through hole is diameter 0.3mm.This does not have any problem at Ka wave band and the following wave band of Ka, but when frequency is very high, the filter cavity size will constantly reduce, when the size of cavity size and plated-through hole can be compared, performance of filter will directly be subjected to the influence of plated-through hole, cause and to utilize the PCB technological design to process reliably the filter of stable performance at high frequency band.
Summary of the invention
Technical problem: the objective of the invention is to propose a kind of substrate integration waveguide multi-mode filter based on square high order cavity, it has well solved at high frequency stage SIW master's mode filter excessive because of the too small performance of cavity is subjected to the plated-through hole influence, cause to design the contradiction of processing, utilize the multimode technology simultaneously, reduced the cavity number, improved selectivity, it is suitable for the millimetre-wave attenuator field very much.This type of multi-mode filter uses individual layer pcb board to realize, has low Insertion Loss, power capacity is big, cost is low, be convenient to integrated and advantage such as batch process.
Technical scheme: the invention provides a class based on the SIW technology, the filter of high order cavity theory and multi-mode feature.Adopted square cavity, used pattern all is higher than second pattern of cavity, comes coupling and eigenfrequency thereof between the adjusting pattern by perceptual post is set, and for single cavity, adopts the input and output of quadrature, to produce required transmission zero.
The dielectric substrate upper surface of filter and lower surface are covered with upper surface metal and lower surface metal respectively, and the plated-through hole array is through dielectric substrate, upper surface metal and lower surface metal; Play the eigenfrequency of adjusting different mode and the first perceptual post and the second perceptual post of the coupling between pattern and be positioned at the square cavity inside that the plated-through hole array surrounds; Be respectively equipped with first metal column perception window, second metal column perception window on adjacent two limits of square cavity, cavity is realized the input and output coupling of energy by metal column perception window; The first plated-through hole array and the second plated-through hole array lay respectively at first metal column perception window, second metal column perception window, and corresponding to the input and output of filter cavity, they are connected with external circuit.By regulating the first plated-through hole array and the second plated-through hole array, can utilize the waveguide cutoff frequency theory, the influence of main mould and other low order mode is suppressed or weaken.Constitute the diameter vr=0.4mm of the plated-through hole of equivalent metallic walls, be spaced apart vs=0.8mm between adjacent through-holes.
The used pattern of each square cavity is all different, and wherein first square cavity dual mode filter is to have adopted opposite side TE 202Mould and accurate TM 020Mould, its ideograph and transmission characteristic see that Fig. 1 (b) shows.Bimodulus square cavity among Fig. 2 has utilized diagonal angle TE 202Mould and opposite side TE 202Mould, its characteristics are that to have utilized be to have utilized perceptual metal column and carried out pattern and eigenfrequency is coordinated.Fig. 3 has showed the substrate integration wave-guide three die cavity fluid filters of a function admirable, in like manner, and perceptual metal column and play adjusting pattern eigenfrequency.Coupling between coupling between modes and the input and output has produced the transmission zero of expection, has well improved the outer selectivity of band.
Beneficial effect: this class filter has well solved because the too high cavity that causes of frequency is too small and can't realize the contradiction of high performance filter with substrate integrated waveguide technology.With substrate integration wave-guide when the above wave band of Ka designs and produces main mode filter because cavity is too small, with the plated-through hole size on an order of magnitude, the tolerance that designing institute allows will reduce greatly, processing also becomes extremely difficult.By adopting higher mode to increase cavity size, make design, making all become and can realize, can accept tolerance and also improve a lot.
High order cavity has higher nonloaded Q, and particularly for circle and square cavity, so such filter has less Insertion Loss.
The transmission zero of bimodulus and three mode filters has been improved the attenuation outside a channel characteristic well.A plurality of limits of being contributed by a cavity make passband more smooth, and the cascade when having avoided using single Design Pattern filter thus between the different cavitys has reduced Insertion Loss and filter volume thus.Although this type of filter works in higher modes, the minimizing of the folding and cavity numbers by structure, they still seem very compact.
The making of this class filter is very simple, all utilizes ripe standard industry technologies, and cost is low and the precision height is produced in batches easily, and enclosed construction thereby radiation are little, isolate and antijamming capability strong, easily and active planar circuit integrated.Such as, only use individual layer pcb board (showing) just realized three mode filters as Fig. 3 and Fig. 4, investigation shows that this is worldwide still the first at present.
Description of drawings
Fig. 1 is based on opposite side TE 202Mould and accurate TM 020The square cavity substrate integration wave-guide dual mode filter of mould, wherein figure (a) is cavity body structure figure, figure (b) is transmission characteristic and mode electric field figure, width=10.4mm, vr=0.4mm, vs=0.8mm, a=3.29mm.
Fig. 2 is based on opposite side TE 202Mould and diagonal angle TE 202The square cavity substrate integration wave-guide dual mode filter of mould, wherein figure (a) is cavity body structure figure, figure (b) is transmission characteristic and mode electric field figure, vr=0.4mm, vs=0.8mm, r 1=0.3mm, r 2=0.8mm, shift=0.61mm, width=10.2mm, a=3.13mm, dis 1=0.25mm, dis 2=3.1mm.
Fig. 3 is based on opposite side TE 202Mould, diagonal angle TE 202Mould and accurate TM 020Square cavity substrate integration wave-guide three mode filters of mould (showing) as Fig. 1 and Fig. 2, figure (a) is cavity body structure figure, figure (b) is transmission characteristic figure, vr=0.4mm, vs=0.8mm, v 1=0.6mm, v 2=0.6mm, shift 1=0.52mm, shift 2=0.48mm, width=10.23mm, length=10.26mm, a=3.66mm, b=3.72mm, d 1=4.09mm, d 2=3.68mm, c 1=3.74mm, c 2=3.8mm.
Fig. 4 side-looking structure chart, ε r=2.2, h=0.5mm.
Fig. 5 embodiment 1 structure chart.
Transmission response figure among Fig. 6 embodiment 1, wherein solid line is a test result, dotted line is a simulation result.
Fig. 7 embodiment 2 structure charts.
Fig. 8 embodiment 2 single chamber three mode filter transmission characteristic figure, solid line is a test result, dotted line is a simulation result.
Fig. 9 embodiment 3 structure charts.
The transmission response figure of Figure 10 embodiment 3 filters.Have among the figure more than (solid line is a test result, and dotted line is a simulation result): dielectric substrate 1, plated-through hole array 2, first perceptual post 3, the second perceptual post 4, the first plated-through hole array 5, the second plated-through hole array 6, upper surface metal 7, lower surface metal 8.
Embodiment
Substrate integration wave-guide higher mode square cavity multi-mode filter (shown in Fig. 1-4) comprises a dielectric substrate 1, the upper surface metal 7, the lower surface metal 8 that are applied at dielectric substrate 1 upper surface and lower surface, be generally copper, and through the plated-through hole array 2 of upper surface metal 7, lower surface metal 8.The perceptual post 3 of inside cavity and perceptual post 4 have been to regulate the eigenfrequency of different mode and the coupling between pattern among Fig. 2 and Fig. 3.Cavity is realized the input and output coupling of energy by metal column perception window.The first plated-through hole array 5, the second plated-through hole array 6 correspond respectively to the input and output of filter cavity, they are connected with external circuit. by regulating the first plated-through hole array 5, the second plated-through hole array 6, can utilize the waveguide cutoff frequency theory, the influence of main mould and other low order mode is suppressed or weaken.The used pattern of each square cavity is all different, and wherein first square cavity dual mode filter is to have adopted opposite side TE 202Mould and accurate TM 020Mould, its ideograph and transmission characteristic see that Fig. 1 (b) shows.Bimodulus square cavity among Fig. 2 has utilized diagonal angle TE 202Mould and opposite side TE 202Mould, its characteristics are that to have utilized be to have utilized first perceptual post 3, the second perceptual post 4 to carry out pattern and eigenfrequency is coordinated.Fig. 3 has showed the substrate integration wave-guide three die cavity fluid filters of a function admirable, and in like manner, first perceptual post 3, the second perceptual post 4 works to regulate the pattern eigenfrequency.Coupling between coupling between modes and the input and output has produced the transmission zero of expection, has well improved the outer selectivity of band.
Embodiment 1 is based on the Q-band filter of two square SIW bimodulus cavitys
The Design of Filter object construction as shown in Figure 5.Bimodulus cavity 51 shown in Figure 1, bimodulus cavity 52 shown in Figure 2, microstrip-fed line that is used to test and transition line 53 thereof, the metallic copper 55 on the dielectric substrate.The size of single substrate integration wave-guide bimodulus cavity is less than 7mm * 7mm, whole filter is formed by two different square double mode cavitys are folding, very compact seems, substrate has adopted the Rogers5880 material, dielectric constant is 2.2, thick 0.254mm, if use the more substrate of high-k, cavity size will further reduce.The actual measurement transmission characteristic of filter is shown in Fig. 6 solid line, and actual measured loss is approximately 4.38dB, and this loss is to have comprised test splice, the loss that microstrip-fed line and transition line bring, if deduct these influences, the active loss of filter should be in 3dB.Design of Filter is in Q-band, and return loss is better than-13.5dB in the band, according to the practical design index, centre frequency is decided to be 46GHz, and bandwidth is 2GHz, and the actual measurement filter bandwidht is about 1.75GHz, error is mainly from manufacturing deficiency, and this can find that some through hole has departed from the position from pictorial diagram.
The single chamber of embodiment 2 Q-bands three mode filters
In order to verify the characteristic of three mode filters, design has realized three mode filters of single square cavity, and structure as shown in Figure 7.Input and output perception window coupling 71, three die cavity bodies 72 shown in Figure 3, the microstrip-fed and transition line 73 of the input and output that are used to test.Cavity size is approximately 7mm * 7mm, and substrate has still adopted thick 0.254mm, and dielectric constant is 2.2 Rogers5880 material.For the ease of test, microstrip-fed line has been carried out 90 deviations of spending, whole three die cavity bodies are realized by metal throuth hole, process very simple.The emulation of filter and test response as shown in Figure 8, the test Insertion Loss of filter is approximately 2.48dB, this has comprised the influence of microstrip-fed line and test splice, the practical filter loss is about 1.1dB, the return loss of filter is better than-21dB.Test and simulation result are very identical, and lower sideband on filter can be found 3 zero points clearly, well improved the selectivity of filter, three limits are arranged in the band, make the passband of filter be tending towards smooth, weak point is that the upper sideband effect of filter is slightly poor.
Embodiment 3 is based on the Q-band filter of square three die cavity bodies and circular bimodulus cavity
Embodiment 3 has been applied to square three die cavity bodies in one two cavity filter, and the phase obtains more performance.The object construction of this filter as shown in Figure 9.Microstrip-fed and the transition line 91 that is used to test, three die cavity bodies, 92, one circular bimodulus cavitys 93 shown in Figure 3.Circular bimodulus cavity has bigger pass band width and better upper sideband.The used substrate of this filter is that 0.254mm is thick, and dielectric constant is 2.2 Rogers5880 material.Filter comprises microstrip line and transition line, and 50 ohm microstrip that are used to test are used for the transition line of impedance matching and a circular cavity and square three die cavity bodies.Test result as shown in Figure 9, the filters to test Insertion Loss is approximately 3.2dB, if remove the influence of joint and little band, active loss should be about 2dB.Record the interior return loss of band and be better than-15.5dB, the three dB bandwidth that records is about 4GHz, from 42.8GHz to 46.8GHz.Can find that measured result and simulation result are very identical.The last lower sideband of this filter all shows excellent performance, just drop to very soon-below the 30dB, passband is very smooth.Only just realized high performance filtering characteristic like this in Q-band, demonstrated the superiority of this class method for designing with two chambeies.The cavity size of this filter can further dwindle, and believes to be applied to higher frequency range, and realization and processing are all very simple and reliable.For the SIW cavity body filter that works in main mould, if use identical substrate, its cavity size is approximately 3.2mm * 3.2mm, and this requirement for processing will be very high, and it will be very little can allowing tolerance, and plated-through hole will be very big to the influence of overall performance.

Claims (2)

1. the substrate integration waveguide multi-mode filter based on square high order cavity is characterized in that this filter is based on opposite side TE 202Mould, diagonal angle TE 202Mould and accurate TM 020Square cavity substrate integration wave-guide three mode filters of mould, dielectric substrate (1) upper surface and lower surface are covered with upper surface metal (7) and lower surface metal (8) respectively, and plated-through hole array (2) is through dielectric substrate (1), upper surface metal (7) and lower surface metal (8); Play the eigenfrequency of adjusting different mode and the first perceptual post (3) and the second perceptual post (4) of the coupling between pattern and be positioned at the square cavity inside that plated-through hole array (2) surrounds; Be respectively equipped with first metal column perception window (7), second metal column perception window (8) on adjacent two limits of square cavity, cavity is realized the input and output coupling of energy by metal column perception window; The first plated-through hole array (5) and the second plated-through hole array (6) lay respectively at outside first metal column perception window (7), second metal column perception window (8), corresponding to the input and output of filter cavity, the first plated-through hole array (5) is connected with external circuit with the second plated-through hole array (6); By regulating the first plated-through hole array (5) and the second plated-through hole array (6), utilize the waveguide cutoff frequency theory, the influence of main mould and other low order mode is suppressed or weaken.
2. the substrate integration waveguide multi-mode filter based on square high order cavity according to claim 1 is characterized in that constituting the diameter vr=0.4mm of the plated-through hole of equivalent metallic walls, is spaced apart vs=0.8mm between adjacent through-holes.
CN2008100190617A 2008-01-11 2008-01-11 A substrate integration waveguide multi-mode filter based on square high order cavity Expired - Fee Related CN101217209B (en)

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CN104241738B (en) * 2014-09-16 2017-06-20 电子科技大学 A kind of substrate integration wave-guide tunable filter of loading PIN pipes
CN110350275A (en) * 2019-06-19 2019-10-18 华中科技大学 A kind of 4 mould SIW double-passband filters
CN110364813B (en) * 2019-07-18 2020-09-15 南通大学 SIW feeding structure of differential input port and antenna array
CN110429383B (en) * 2019-07-18 2020-09-15 南通大学 Single-input-port SIW feeding structure and antenna array
CN112002974B (en) * 2020-08-28 2021-12-07 成都频岢微电子有限公司 Miniaturized SIW resonant cavity and wide-stop-band SIW filter formed by same

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