CN202259651U

CN202259651U - Allotype resonance rod

Info

Publication number: CN202259651U
Application number: CN 201120414804
Authority: CN
Inventors: 胡文伟
Original assignee: Wuhan Fingu Electronic Technology Co Ltd
Current assignee: WUHAN FINGU CERAMIC MATERIAL CO., LTD.
Priority date: 2011-10-27
Filing date: 2011-10-27
Publication date: 2012-05-30
Anticipated expiration: 2021-10-27

Abstract

The utility model discloses an allotype resonance rod, which comprises a resonance rod body with a cylindrical structure. An opening is arranged on an upper side wall of the resonance rod body. With the adoption of the utility model, through the design that the opening is additionally arranged on an upper side wall of the resonance rod body, the frequency of the resonance rod is improved so as to reach the purpose of producing and processing the resonance rod with direct using of the traditional materials and greatly reduce the manufacture cost; and meanwhile, also with the design of the opening, the usage quantity of the materials required for processing the resonance rod is reduced, and the manufacture cost is further lowered. The allotype resonance rod has the characteristics of simple structure, low cost, capability of ensuring the stability of a filter at a high/low temperature state and the like and is suitable for the resonance rod.

Description

A kind of special-shaped resonant rod

Technical field

The utility model relates to resonant rod, refers to a kind of special-shaped resonant rod particularly.

Technical background

Along with the development of TD-LTE technology, the parameter request of filter is also increasingly high.For the TD-LTE project of 2.6GHz frequency range, generally adopt 8 chamber resonators and 4 transmission zero schemes.The S curve of the filter that this scheme is used (adopting the filter of 45# steel processing resonant rod) is as shown in Figure 5: guarantee that normal temperature index difficulty is little, but how to guarantee that its stability under high and low temperature state is only key.Realize so strict electric index; Promptly require to accomplish good temperature compensation in the 2.6G frequency range; Common practices is to adopt invar materials processing resonant rod at present; Utilize its low-expansion coefficient good under high low temperature condition to guarantee its reliability, but the invar material price is higher tens times than the price of traditional material (45# steel).

At present, when adopting traditional material processing resonant rod, in order to guarantee the stability of filter under high and low temperature state as much as possible, general employing is increased the dark means of resonant rod and reduction chamber and is reduced resonant rod and cover plate distance as far as possible.But increasing resonant rod deeply all is that the resonant rod frequency is reduced with reducing the chamber;, this trend will cause the resonant rod frequency not reach requirement when changing to a certain degree; When continuing to increase resonant rod and reduce the chamber when dark, tuning screw rod moves back sky, and high low temperature still can not meet the demands.So when the reduction chamber is dark, need to improve the frequency of resonant rod, like this, the distance between resonant rod and cover plate is further dwindled.Conventional design is exactly to continue the overstriking resonant rod, but so single chamber Q value will descend, and the filter insertion loss value will become greatly, is the key of dealing with problems so how to improve the frequency of resonant rod.

Summary of the invention

The purpose of the utility model is in order to solve the deficiency that above-mentioned background technology exists, to provide a kind of simple in structure, and cost is low and can guarantee filter stable special-shaped resonant rod under high and low temperature state.

For realizing above-mentioned purpose; The utility model adopts following technical scheme: a kind of special-shaped resonant rod; The resonant rod body that comprises tubular structure; Said resonant rod body upper portion side wall is provided with opening, and such design has realized directly using traditional material production and processing resonant rod, greatly reduces manufacturing cost; And the design of said opening has also reduced the consumption of processing resonant rod material requested, has further reduced manufacturing cost.

In the such scheme, said number of openings is at least one, and this number of openings can design according to actual needs.

In the such scheme, the width of said opening is not more than the diameter of said resonant rod body, and the degree of depth of this opening is not more than said resonant rod body height.

The principle of the utility model is following:

Said resonant rod bottom ground connection has certain distance between resonant rod top and the cover plate, equivalence becomes plates capacitance between the two.Resonant frequency equation is: f=1/sqrt (2 π (CL)) (sqrt: root mean square, C: the termination capacitor of resonant rod, L: equivalent inductance; π is a constant); From this formula, can find,, reduce the resonance frequency that its termination capacitor C and equivalent inductance L just can improve single chamber with the wire chamber resonator.And the formula of termination capacitor C is: (S: the electric capacity two-plate is over against area, d: the vertical range between two-plate for C=ε S/4 π kd; ε: dielectric constant, 4 π k are constant).So; Designed openings on the sidewall of traditional resonant rod, actual is exactly when not changing the electric capacity remaining variables, increased separately termination capacitor apart from d; And then reduced termination capacitor C; Simultaneously under the constant situation of other overall dimensions of resonant rod, the height of opening part reduces and is equivalent to inductance L and reduces, thereby the two acting in conjunction reaches the purpose that improves frequency f.

The utility model has improved the frequency of resonant rod through on resonant rod body upper portion side wall, adding the design of opening, thereby has realized the purpose of direct use traditional material production and processing resonant rod, greatly reduces manufacturing cost; Simultaneously, the design of said opening has also reduced the consumption of processing resonant rod material requested, has further reduced manufacturing cost.

The utlity model has simple in structurely, cost is low and can guarantee filter characteristics such as stability under high and low temperature state.

Description of drawings

Fig. 1 is the main TV structure sketch map of the utility model;

Fig. 2 is the plan structure sketch map of the utility model;

Fig. 3 is the cross-sectional view of the utility model;

Fig. 4 is the perspective view of the utility model;

Fig. 5 processes the S curve chart of the filter of resonant rod for adopting the 45# steel.

Wherein, resonant rod body 1, opening 2.

Embodiment

Below in conjunction with accompanying drawing and specific embodiment the utility model is done further to specify:

As shown in Figure 1, present embodiment comprises the resonant rod body 1 of tubular structure, and said resonant rod body 1 upper portion side wall is provided with opening 2, and such design has realized directly using traditional material production and processing resonant rod, greatly reduces manufacturing cost; And the design of said opening 2 has also reduced the consumption of processing resonant rod material requested, has further reduced manufacturing cost (referring to Fig. 2, Fig. 3 and Fig. 4).

As shown in Figure 2, the quantity of said opening 2 is two, and two opening 2 symmetric arrangement help the assembling of this resonant rod like this, and certainly, the quantity of this opening 2 can design (referring to Fig. 3 and Fig. 4) according to actual needs.

As shown in Figure 3, the width of said opening 2 is not more than the diameter of said resonant rod body 1, and the degree of depth of this opening 2 is not more than said resonant rod body 1 height (referring to Fig. 1, Fig. 2 and Fig. 4).

The utility model has improved the frequency of resonant rod through on resonant rod body 1 upper portion side wall, adding the design of opening 2, thereby has realized the purpose of direct use traditional material production and processing resonant rod, greatly reduces manufacturing cost; Simultaneously, the design of said opening 2 has also reduced the consumption of processing resonant rod material requested, has further reduced manufacturing cost.The utility model is simple in structure, and cost is low and can guarantee filter stability under high and low temperature state.

The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. special-shaped resonant rod comprises the resonant rod body of tubular structure it is characterized in that said resonant rod body upper portion side wall is provided with opening.

2. a kind of special-shaped resonant rod according to claim 1 is characterized in that said number of openings is at least one.

3. a kind of special-shaped resonant rod according to claim 2 is characterized in that the width of said opening is not more than the diameter of said resonant rod body.