CN204885376U

CN204885376U - Discrete dielectric filter

Info

Publication number: CN204885376U
Application number: CN201520515689.1U
Authority: CN
Inventors: 刘亚玲; 刘文征
Original assignee: Shenzhen Qianhan Technology Co Ltd
Current assignee: Shenzhen Qianhan Technology Co Ltd
Priority date: 2015-07-16
Filing date: 2015-07-16
Publication date: 2015-12-16
Anticipated expiration: 2025-07-16

Abstract

The utility model provides a discrete dielectric filter, this wave filter includes the dielectric matrix, medium base plate and connection metal contact pin between them, the medium base plate has the preceding terminal surface as the evolution face, as the rear end face of the face that opens circuit and conduct inputoutput interface's lower surface, what have a perfect understanding its preceding terminal surface and rear end face on the medium base plate is equipped with the parallel base plate through -hole of the one row of axis, all be equipped with the interior conducting layer of second on the internal surface of every base plate through -hole, on the preceding terminal surface around the periphery of each base plate through -hole scribble respectively be covered with with the second in the local conducting layer be connected of conducting layer. The utility model discloses a constitute and structure to the wave filter carries out the optimal design, and the metal contact pin will have coaxial cavity's dielectric matrix and the filter element's in the akin electric field medium base plate electrically connected forms the wave filter together, has the interior low -loss of passband, the outer high electric property that restraines of passband.

Description

A kind of discrete dielectric filter

Technical field

The utility model relates to the Ceramic Dielectric Filter that the equipment such as wireless mobile communication base station, repeater uses, be specifically related to a kind of can improve band internal loss, Out-of-band rejection, second harmonic discrete dielectric filter you.

Background technology

Along with the fast development of wireless mobile telecommunication technology, require that the performance requirement of the equipment such as communication base station, repeater is more and more higher, wherein, filter should have best passband characteristic as frequency-selecting device in frequency band, best resistance characteristic frequently should be had at frequency band sideband, best stopband rejection ratio should be had at second harmonic place.Traditional Contiuum type Ceramic Dielectric Filter is difficult to realize the large suppression of the large suppression of loss little in frequency band, frequency band sideband and second harmonic place simultaneously; The suppression of traditional discrete Ceramic Dielectric Filter at second harmonic place has greatly improved relative to traditional Contiuum type structure tool, but, traditional discrete filter is by the entirety being welded on ability shaping filter after on pcb board independent for dielectric matrix, simultaneously, the capacitor and inductor of filtering is and is SMDly welded on pcb board, pcb board add and electric property that patch capacitor inductance itself is unstable inevitably brings increase and because the affected problem of frequency band suppress sideband brought of the problem of ground connection property difference of loss.

Summary of the invention

In order to solve the deficiency in background technology, the purpose of this utility model is the defect overcoming background technology, a kind of discrete dielectric filter is provided, its objective is that going out to send to improve the passband internal loss of filter, suppress sideband and second harmonic from structure suppresses, and is more conducive to the design of product.

For achieving the above object, the technical solution adopted in the utility model is: a kind of discrete dielectric filter, comprise at least two dielectric matrixs that split is arranged, each described dielectric matrix is equipped with resonance hole, the part surface of described dielectric matrix is provided with outer conducting layer, the inner surface in described resonance hole is provided with the first inner conducting layer be connected with outer conducting layer, it is characterized in that: it also comprises the medium substrate that integral type is arranged, and connect the metal ferrule of described dielectric matrix and medium substrate, described medium substrate has the front end face as evolution face, rear end face as open circuit face and the lower surface as input/output interface, the substrate through-hole being provided with row's axis being parallel of its front end face through and rear end face on described medium substrate, the quantity of described substrate through-hole is consistent with the quantity in resonance hole, the inner surface of each described substrate through-hole is equipped with the second inner conducting layer, described front end face is coated with respectively the local conductive layer be connected with the second inner conducting layer around the periphery of each described substrate through-hole, be without coating area between the conductive layer of each described local, one end of described metal ferrule is fixed in described resonance hole, its other end is fixed in described substrate through-hole.

In the utility model preferred embodiment, the lower surface comprising described medium substrate is further provided with input terminal conductive layer and lead-out terminal conductive layer, and described input terminal conductive layer and/or lead-out terminal conductive layer extend to the side of described medium substrate.

In the utility model preferred embodiment, comprise further described metal ferrule have by every chaste tree every the first contact pin of connection breaking and the second contact pin, described first contact pin and the second contact pin insert in described resonance hole and substrate through-hole respectively.

In the utility model preferred embodiment, comprise it further and also comprise radome, described radome is located at the outside after described dielectric matrix, metal ferrule, medium substrate composition entirety.

Usefulness of the present utility model is: a kind of discrete dielectric filter of the present utility model, by being optimized design to the composition structure of filter, by metal ferrule using the shaping filter that is electrically connected as the dielectric matrix of coaxial resonator and the medium substrate of the filter capacitor be equivalent in electric field or filter inductance, do not need PCB substrate and can directly welding assembly on complete machine substrate, owing to there is no the intervention of PCB substrate and patch capacitor inductance, make the ground connection property of filter better, bring the performance of high pass Out-of-band rejection thus;

Meanwhile, the conductive layer after silver slurry sintering is applied on filter relative to surface mount elements has less passband internal loss, is more conducive to the design of product.

Accompanying drawing explanation

Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.

Fig. 1 is the structural representation of the utility model preferred embodiment;

Fig. 2 is the structural representation of the band lower surface of the medium substrate of the utility model preferred embodiment.

In figure: 2, dielectric matrix, 21, without coat side, 4, resonance hole, 6, outer conducting layer, the 8, first inner conducting layer, 10, medium substrate, 101, front end face, 102, rear end face, 103, lower surface, 104, substrate through-hole;

12, metal ferrule, the 14, second inner conducting layer, 16, local conductive layer, 18, input terminal conductive layer, 20, lead-out terminal conductive layer, the 22, first contact pin, the 24, second contact pin, 26, every chaste tree, 28, radome.

Embodiment

In order to make those skilled in the art person understand the utility model scheme better, and enable above-mentioned purpose of the present utility model, feature and advantage become apparent more, below in conjunction with embodiment and embodiment accompanying drawing, the utility model is described in further detail.

As Fig. 1, shown in 2, the utility model provides a kind of discrete dielectric filter, comprise at least two dielectric matrixs 2 that split is arranged, for convenience of description, preferred employing two dielectric matrixs 2, but be not limited to two, the quantity of dielectric matrix 2 does not form the restriction of the application, discrete dielectric filter comprises two dielectric matrixs 2 that split is arranged, the medium substrate 10 of one piece of accumbency, the metal ferrule 12 of connecting media matrix 2 and medium substrate 10, and be located at dielectric matrix 2, metal ferrule 12, medium substrate 10 forms the radome 28 in the outside after entirety.

Wherein, dielectric matrix 2 is the integrated rectangular structure of ceramic material, there are six smooth surfaces, five end faces are wherein equipped with outer conducting layer 6, after outer conducting layer 6 preferably adopts the coating of silver slurry, high temperature sintering forms, an end face is had to be that each described dielectric matrix 2 is equipped with resonance hole 4, the inner surface in described resonance hole 4 is provided with the first inner conducting layer 8 be connected with outer conducting layer 6 without coat side 21;

Medium substrate 10 is for there being the integrated rectangular structure of ceramic material, there are six smooth surfaces, there is the front end face 101 as evolution face, as the rear end face 102 in open circuit face, and lower surface 103, described lower surface 103 is provided with input terminal conductive layer 18 and lead-out terminal conductive layer 20, described input terminal conductive layer 18 and/or lead-out terminal conductive layer 20 extend to the side of described medium substrate 10, the substrate through-hole 104 being provided with row's axis being parallel of its front end face 101 through and rear end face 102 on described medium substrate 10, the quantity of described substrate through-hole 104 is consistent with the quantity in resonance hole 4, in this city embodiment, preferably employing connects a substrate through-hole 104, the inner surface of each described substrate through-hole 14 is equipped with the second inner conducting layer 14, described front end face 101 is coated with respectively the local conductive layer 16 be connected with the second inner conducting layer 14 around the periphery of each described substrate through-hole 14, be without coating area between each described local conductive layer 16.

The metal ferrule 12 consistent with the quantity of resonance hole 4 and substrate through-hole 104, metal ferrule 12 has by cutting off the first contact pin 22 and the second contact pin 24 connected every chaste tree 26, and described first contact pin 22 and the second contact pin 24 to insert in described resonance hole 4 and substrate through-hole 104 respectively.

After above-mentioned all conductive layers all adopt the coating of silver slurry, high temperature sintering forms.

Above-mentioned dielectric matrix 2 forms resonator, the resonance hole 4 arranged with row forms coaxial resonant cavity, dielectric matrix 2 and medium substrate 10 are electrically connected the equivalent capacity formed between the outer conducting layer 6 on rear local conductive layer 16 and dielectric matrix 2 in electric field by metal ferrule 12, overall shaping filter is overall, conductive layer after drawing silver slurry sintering by test is applied on filter relative to surface mount elements has less loss, simultaneously, adding of pcb board is not had in the formation of composition filter, make the ground connection property of filter better, bring the outer high suppression of upper passband thus, the performance that high second harmonic suppresses, be more conducive to the design of product.

Above-described embodiment is the utility model preferably execution mode; but execution mode of the present utility model is not limited by the examples; the change done under other any does not deviate from Spirit Essence of the present utility model and principle, modification, substitute, combine, simplify the substitute mode that all should be equivalence, be included within protection range of the present utility model.Therefore, the protection range that protection range of the present utility model should define with claim is as the criterion.

Claims

1. a discrete dielectric filter, comprise at least two dielectric matrixs that split is arranged, each described dielectric matrix is equipped with resonance hole, the part surface of described dielectric matrix is provided with outer conducting layer, the inner surface in described resonance hole is provided with the first inner conducting layer be connected with outer conducting layer, it is characterized in that: it also comprises the medium substrate that integral type is arranged, and connect the metal ferrule of described dielectric matrix and medium substrate, described medium substrate has the front end face as evolution face, rear end face as open circuit face and the lower surface as input/output interface, the substrate through-hole being provided with row's axis being parallel of its front end face through and rear end face on described medium substrate, the quantity of described substrate through-hole is consistent with the quantity in resonance hole, the inner surface of each described substrate through-hole is equipped with the second inner conducting layer, described front end face is coated with respectively the local conductive layer be connected with the second inner conducting layer around the periphery of each described substrate through-hole, be without coating area between the conductive layer of each described local, one end of described metal ferrule is fixed in described resonance hole, its other end is fixed in described substrate through-hole.

2. a kind of discrete dielectric filter according to claim 1, it is characterized in that: the lower surface of described medium substrate is provided with input terminal conductive layer and lead-out terminal conductive layer, and described input terminal conductive layer and/or lead-out terminal conductive layer extend to the side of described medium substrate.

3. a kind of discrete dielectric filter according to claim 2, it is characterized in that: described metal ferrule have by every chaste tree every the first contact pin of connection breaking and the second contact pin, described first contact pin and the second contact pin insert in described resonance hole and substrate through-hole respectively.

4. a kind of discrete dielectric filter according to claim 1, is characterized in that: it also comprises radome, and described radome is located at the outside after described dielectric matrix, metal ferrule, medium substrate composition entirety.