CN201063353Y

CN201063353Y - Cavity filter with naught cavity

Info

Publication number: CN201063353Y
Application number: CNU2006201726755U
Authority: CN
Inventors: 孟庆南; 杨志敏
Original assignee: Wuhan Fingu Electronic Technology Co Ltd
Current assignee: Wuhan Fingu Electronic Technology Co Ltd
Priority date: 2006-12-28
Filing date: 2006-12-28
Publication date: 2008-05-21
Anticipated expiration: 2016-12-28

Abstract

The utility model provides a cavity filter provided with a zero cavity which relates to the microwave communication technical field, in particular to the cavity filter. The utility model aims to provide an arranging cavity technical proposal of the cavity filter with a zero cavity, and mainly comprises a cavity, a cover plate, resonant rods, a tuning screw, a connector and other main structural components, wherein, a resonant cavity and a zero cavity are arranged in the cavity of the filter, a capacitive component or an inductive component is coupled between two resonant rods of the zero cavity and an output port; the position of the zero cavity in the cavity of the filter can be upper or/and lower, left and/or right. The utility model has the advantages that the zero cavity in the cavity filter is one or a plurality of coaxial wave trap structures arranged on a band-pass filter, thereby improving out band rejection.

Description

A kind of cavity body filter that has zero chamber

Technical field

The utility model relates to technical field of micro communication, and is specifically relevant with cavity body filter.

Technical background

Those skilled in the art is fully aware of, and cavity body filter is a passive device, it can be in communication system filtering interference signal useless, guarantee signal operate as normal in the operating frequency range, and pass through with the loss of minimum.This filter is by the distributed constant principle design, realizes its performance index by mechanical structure.Traditional cavity body filter is pressed method for designing in the past, draws as cross-couplings between the inner non-conterminous chamber of band pass filter, improves the outer inhibition of band, also can increase but passband inserts loss thereupon.This row chamber technical scheme can't satisfy filter sometimes to inserting the outer requirement that suppresses of loss and band.

The utility model content

The purpose of this utility model is the deficiency that exists in the above-mentioned background technology in order to solve, the row chamber technical scheme that a kind of cavity body filter has zero chamber is proposed, it mainly is made up of main components such as cavity, cover plate, resonant rod, tuning screw rod, connectors, described in the utility model is to be provided with resonant cavity and zero chamber in filter cavity, between two resonant rods of zero chamber and output port, connect with a capacitive character or inductive couplings, zero position of chamber in filter cavity can go up or/can descend, left and/or right.Described in the utility model is to be connected with electric capacity or inductive component between resonant cavity and zero chamber, described in the utility model is that the zero chamber of arranging in cavity body filter can be more than one or two, and makes trap point position with strong and weak adjustable by capacitive character and inductive element are set between zero chamber and resonant cavity.

Superiority of the present utility model is, zero chamber in this cavity body filter is one or several the coaxial trap structure that is provided with on band pass filter, band is outer to be suppressed thereby improve, because trap structure, it is almost nil to insert loss outside trap point, so the passband Insertion Loss is constituted influence hardly, make performance of filter more optimize, insert the outer index that suppresses of loss and band and be better than traditional filter.

Description of drawings

Fig. 1 is the row chamber schematic diagram that the utility model has two cavity structures.

Fig. 2 is Fig. 1 cavity cover plate schematic diagram.

Fig. 3 is the utility model has been arranged capacitance component between zero chamber resonant cavity a structural representation.

Embodiment

In conjunction with accompanying drawing provided by the utility model, we further describe the execution mode of this structure.

Formerly we generally only add one zero chamber, and it is by PCB that output port commonly used and zero chamber are connected, conducting metal, and coupling window, what introduce below is to have added two even also want many zero chambeies, resonant cavity is the capacitive/inductive modular construction with zero being connected of chamber.

Embodiment 1, introduces two zero chambeies in filter, and the structure in zero chamber is identical with other main transmission cavity structures, all is by resonant rod, cavity, and cover plate, tuning screw rod formation, their size and structure all are to decide during by actual design.But because zero chamber is when filter is worked, resonance frequency exerts an influence so can not insert loss to passband outside passband, only can produce two transmission zeros outside passband, improves the band outside inhibitory energy of filter.The row chamber scheme that has added two zero cavity configurations as figure is overlooked shown in Figure 1.

Referring to figs. 1 through Fig. 2, this example is mainly by input port 1, output port 2, be to couple together with the metal and the resonant rod that conduct electricity, input and output port is a connector, can use the N type, the SMA type, 7/16 type, QN and QMA, so long as the connector of 50 Ω output according to the client different requirements can use cavity 3, (resonant cavity is that the single chamber and the resonant rod of cavity connects to form to tradition resonant cavity 4, can chamber, the side of being, cylindrical cavity, rectangular cavity or irregular chamber all are passable, the size in single chamber and resonant rod size all be during by actual design decide) cover plate 7, screw rod 6 and zero chamber 5A, main components such as 5B constitute, have a window to be of coupled connections between two resonant rods of zero chamber and output port, zero chamber on the position of cavity can be or down, and is left or right, filter signal enters from input port 1, export from output port 2 by traditional resonant cavity 4 backs, wherein zero chamber 5A, the resonance frequency of 5B is beyond band connection frequency, so produce two transmission zeros beyond the passband of filter.

Embodiment 2, in filter, introduce one zero chamber, the structure in zero chamber is identical with other main transmission cavity structures, all be by resonant rod, cavity, cover plate, tuning screw rod constitutes, and between zero chamber and traditional resonant cavity, introduce electric capacity or inductive component, the transmission zero location that this structure realized is adjustable, and more flexible for the control of the outer inhibition point power of some band.Can about passband, adjust.Simultaneously, the power at zero point of this structure also is to carry out certain adjustment.By contrast, this structure more flexible more has superiority.As the vertical view 3 of scheming to have added between zero chamber and the traditional resonant cavity capacitive component.

With reference to Fig. 3, this example is mainly by input port 1, output port 2, cavity 3, tradition resonant cavity 4, capacitive component 8, main components such as cover plate 7 and screw rod 6 and zero chamber 5A constitute, input port and output port and resonant rod all are to couple together with the metal that conducts electricity, input and output port is a connector, can use the N type, the SMA type, 7/16 type, QN and QMA, so long as the connector of 50 Ω output according to the client different requirements can use, resonant cavity is that the single chamber and the resonant rod of cavity connects to form, can chamber, the side of being, cylindrical cavity, rectangular cavity or irregular chamber all are passable, the size in single chamber and resonant rod size all be during by actual design decide, filter signal enters from input port 1, from output port 2 outputs, wherein the resonance frequency of zero chamber 5A is beyond band connection frequency, so produce a transmission zero beyond the passband of filter by traditional resonant cavity 4 backs, the position of this transmission zero and power can be controlled by capacitance component/Inductive component.

The advantage that the inventor proposes above two kinds of versions is that filter insertion loss is littler, and band is outer to suppress better, and structure is flexible, and advantage is big, and the position of transmission zero and power can be controlled by capacitance component/Inductive component, and good practical value is arranged.

Claims

1. cavity body filter that has zero chamber, it is made up of filter cavity, cover plate, resonant cavity, resonant rod, tuning screw rod, connector, it is characterized in that in filter cavity, being provided with resonant cavity and zero chamber, between two resonant rods of zero chamber and output port, connect with a capacitive character or inductive couplings, zero position of chamber in filter cavity can go up or/can descend, left and/or right.

2. by the described a kind of cavity body filter that has zero chamber of claim 1, it is characterized in that between resonant cavity and zero chamber, being connected with electric capacity or inductive component.

3. by the described a kind of cavity body filter that has zero chamber of claim 1, it is characterized in that the zero chamber of arranging can be more than one or two in filter cavity, and between zero chamber and resonant cavity, make trap point position with strong and weak adjustable by capacitive character and inductive element are set.