CN204905392U

CN204905392U - Integrated waveguide filter of dual 14 folding mould substrates

Info

Publication number: CN204905392U
Application number: CN201520571076.XU
Authority: CN
Inventors: 朱永忠
Original assignee: Engineering University of Chinese Peoples Armed Police Force
Current assignee: Engineering University of Chinese Peoples Armed Police Force
Priority date: 2015-07-31
Filing date: 2015-07-31
Publication date: 2015-12-23
Anticipated expiration: 2025-07-31

Abstract

The utility model relates to an integrated waveguide filter of dual 14 folding mould substrates, this wave filter comprises two DFQMSIW resonant cavities, passes through between the resonant cavity in intermediate metal layer fluting realization coupling, and input, output port pass through microstrip line and the coupling of DFQMSIW resonant cavity. This wave filter adopts the DFQMSIW resonant cavity to reduce the plane size to 116 of SIW resonant cavity, highly is the twice of SIW resonant cavity, and to a great extent has reduced the plane size of resonant cavity, and filter configuration is simple, the processing degree of difficulty is low, has very strong practicality.

Description

A kind of double folding 1/4 mould substrate integral wave guide filter

Technical field

The utility model belongs to microwave technical field, relates to a kind of double folding 1/4 mould substrate integration wave-guide (DoubleFoldedQuarterModeSubstrateIntegratedWaveguide, DFQMSIW) filter based on PCB technology.

Background technology

Substrate integration wave-guide (SubstrateIntegratedWaveguide, SIW) be a kind of novel microwave transmission structure utilizing metallic vias to realize waveguide field communication mode on dielectric substrate, it is a kind of transmission line between microstrip line and dielectric-filled waveguide, both there is the feature that conventional waveguide loss is little, Q value is high, possess again the advantage that microstrip transmission line size is little, cost is low, also Yi Yuwei band waits other microwave transmission structures to carry out integrated simultaneously.Using SIW as the microwave device of platform as power divider, directional coupler, filter, oscillator etc. all possess good performance.

When operating frequency is lower, actual SIW structure and the size of function module circuit still larger, have impact on integrated level and the practical application of circuit.So; in order to meet the requirement of system compact; there is many new structures based on SIW technology, comprise half module substrate integrated wave guide (HMSIW), folded substrate integrated waveguide (FSIW), 1/4th mould substrate integration wave-guides (QMSIW), double folding substrate integration wave-guide (DFSIW) and folding self-die substrate integrated waveguide (FHMSIW) etc.In conjunction with 1/4th moulds and double folding substrate integrated waveguide technology, design highly for original SIW resonant cavity twice, intermediate metal layer have double folding 1/4th mould (DFQMSIW) resonant cavity of " L " shape groove.The planar dimension of DFQMSIW resonant cavity is 1/16 of original SIW resonant cavity.

SIW resonant cavity filter design is both at home and abroad mainly based on common SIW resonant cavity and HMSIW resonant cavity at present, and when lower frequency range, SIW or HMSIW resonant cavity filter still has larger volume.

Utility model content

The object of utility model: in order to provide a kind of double folding 1/4 mould substrate integral wave guide filter of better effects if, specific purposes are shown in multiple substantial technological effects of concrete implementation section.

In order to reach as above object, the utility model takes following technical scheme:

A kind of double folding 1/4 mould substrate integral wave guide filter; it is characterized in that: comprise two medium substrates, three metal levels, input port, output ports; wherein two medium substrates and three metal levels are alternately arranged; each medium substrate is between adjacent two metal levels; each medium substrate is provided with two row's plated-through holes of vertical arrangement; input port, output port are positioned at the two ends of intermediate metal layer, realize coupling between adjacent two resonant cavitys by the elongated slot on intermediate metal layer.

The further technical scheme of the utility model is, described input port and output port realize being coupled with the most contiguous two resonant cavitys by microstrip line respectively.

Adopt the utility model of as above technical scheme, following beneficial effect is had: the planar dimension of filter, owing to adopting DFQMSIW resonant cavity, can be reduced to 1/16 of common SIW resonant cavity filter by (1) the utility model filter relative to prior art;

(2) the utility model filter construction is simple, difficulty of processing is low, easy and other circuit Integrated design, and can be regulated the size of coupling amount by coupling slot, has very strong practicality.

Accompanying drawing explanation

In order to further illustrate the utility model, be described further below in conjunction with accompanying drawing:

Fig. 1 is the utility model DFQMSIW resonant cavity illustraton of model;

Fig. 2 is for adopting the stereogram of DFQMSIW filter graph architecture of the present utility model;

Fig. 3 is for adopting the plane graph of DFQMSIW filter graph architecture of the present utility model;

Fig. 4 is the S parameter simulation result of DFQMSIW filter.

Embodiment

Be described embodiment of the present utility model below in conjunction with accompanying drawing, embodiment does not form restriction of the present utility model:

The principle of the utility model filter is as follows:

Because SIW works in holotype TE ₁₀time electric field maximum along in the vertical central plane of the direction of propagation, therefore this central plane can think an equivalent magnetic wall, and along this vertical central plane (virtual magnetic wall), SIW can be cut into two parts, every part is a HMSIW.What HMSIW was divided equally into that two parts obtain again along equivalent magnetic wall is exactly QMSIW structure, and its field distribution is similar to the field distribution of original SIW.SIW folds along length and Width simultaneously obtains by double folding SIW, is highly the twice of original SIW, intermediate metal layer has " L " shape groove.In conjunction with 1/4th moulds and double folding SIW technology, have devised DFQMSIW resonant cavity, as shown in Figure 1.Multiple DFQMSIW resonant cavity is horizontal, and adjacent resonators realizes coupling by the mode of fluting, is easy to realize various forms of filter.

For two chamber DFQMSIW filters, the utility model is explained in detail below:

Be illustrated in figure 3 the utility model DFQMSIW filter embodiment structural representation, this filter construction comprises input port, output port, two dielectric-slabs, three metal levels, plated-through hole and coupling slots as seen from the figure, input/output port lays respectively at the two ends of intermediate metal layer, be coupled with DFQMSIW resonant cavity by 50 Ω microstrip lines, regulated the loaded Q of input and output resonant cavity by the coupling position adjusting microstrip line and resonant cavity.

By realizing coupling at intermediate metal layer fluting between adjacent two resonant cavitys, according to the size of the adjustment coupling amount that varies in size of coupling slot.

Fig. 3 is that two chamber bands of design lead to DFQMSIW filter, selects dielectric constant to be 2.55, is highly the medium substrate of 1mm, optimize each design parameter, obtain two chamber DFQMSIW filter simulation results as shown in Figure 4.As can be seen from the results, the centre frequency of filter is 2.9GHz, and relative bandwidth is 20%, and in band, maximum Insertion Loss is 0.07dB, and the return loss in bandwidth of operation is lower than-25dB.Filter volume is 29mm × 12.2mm × 2mm.Described resonant cavity is the combination of double folding technology and 1/4 mould technology.Described resonant cavity on the basis of 1/4 mould substrate integration wave-guide resonant cavity, carries out twice fold, and forms double-decker, realize levels Energy Coupling at the edge in intermediate layer by " L " gap.Coupling between described resonant cavity realizes by slotting on intermediate metal layer

More than show and describe general principle of the present utility model, principal character and advantage of the present utility model.Those skilled in the art should understand the utility model and not be restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed scope.

Claims

1. a double folding 1/4 mould substrate integral wave guide filter; it is characterized in that: comprise two medium substrates, three metal levels, input port, output ports; wherein two medium substrates and three metal levels are alternately arranged; each medium substrate is between adjacent two metal levels; each medium substrate is provided with two row's plated-through holes of vertical arrangement; input port, output port are positioned at the two ends of intermediate metal layer, realize coupling between adjacent two resonant cavitys by the elongated slot on intermediate metal layer.

2. a kind of double folding 1/4 mould substrate integral wave guide filter as claimed in claim 1, is characterized in that: described input port and output port realize being coupled with the most contiguous two resonant cavitys by microstrip line respectively.