CN202712385U

CN202712385U - Compact-structure UWB single-notching filter

Info

Publication number: CN202712385U
Application number: CN 201120518485
Authority: CN
Inventors: 胡萍; 韩莹; 刘乘源
Original assignee: Harbin Feiyu Technology Co Ltd
Current assignee: Harbin Feiyu Technology Co Ltd
Priority date: 2011-12-10
Filing date: 2011-12-10
Publication date: 2013-01-30
Anticipated expiration: 2021-12-10

Abstract

The utility model discloses a compact-structure UWB single-notching filter, which belongs to the field of microstrip filters. The filter is composed of a dielectric substrate, a microstrip structure with open stubs which is arranged on the dielectric substrate, and a metal grounding plate under the dielectric substrate. A radiation unit of the filter is a rectangular structure etched on the metal grounding plate. An open stub structure on the dielectric substrate forms a coplanar waveguide feed structure. According to the compact-structure UWB single-notching filter of the utility model, a multi-mode resonator is adopted to realize pass band bandwidth required by a UWB; a DGS is adopted; a flat Chinese-character-''ri''-shaped slot line structure is etched around the rectangular radiation unit so as to generate a band-notching characteristic, and as a result, the filter can satisfy collaborative operation of a UWB communication system and a narrowband system. The filter of the utility model is of favorable notching characteristic, and with the notching characteristic, the filer can filter interference of WLAN signals on the UWB in the vicinity of 5.8 GHz. The filter is advantageous in simplicity, compact structure, small size, convenient processing, low cost, and adjustable notching positions.

Description

The single notch filter of a kind of UWB of compact conformation

Technical field

The utility model discloses the single notch filter of a kind of UWB, this filter can be used for the interference of WLAN signal in the filtering UWB.

Background technology

In February, 2002, FCC (FCC) approval 3.1--10.6GHz frequency range is used for business telecommunication, so UWB is widely used.Yet in the commercial scope of FCC definition, the UWB signal may be subject to the interference of signals such as WiAX (3.5-GHz), WLAN (5.2-and 5.8-GHz), RFID (6.8GHz).Therefore the filter that has trap characteristic has very high practical value.

Some mentalities of designing occurred in recent years, such as multimode resonator (MMR), via structure etc., although this writes the effect that structure can realize trap, the size of these structures is larger, and trap is non-adjustable.So the UWB band pass filter that design size is compact, trap is adjustable has great importance.

The utility model content

The purpose of this utility model is to provide a kind of small size, and with single trap characteristic and the adjustable filter of trap, this filter can reduce the WLAN signal to the interference of UWB signal, realizes the communication for coordination between ultra-wideband communication system and the narrowband systems.

The technical scheme that the utility model adopts:

The single notch filter of a kind of UWB of compact conformation, comprise the microstrip line 101 and the metal ground plate 103 that are formed at dielectric-slab 106 upper and lower surfaces, it is characterized in that, described metal ground plate comprises multimode cavity 104, rectangular radiation unit 102 and is embedded in interior flat " day " the font slot line structure 105 of multimode cavity.

According to claim 1, the single notch filter of the UWB of described novel compact conformation is characterized in that, the width of every broadside of described flat " day " word line of rabbet joint equates with the gap between each limit.

The single notch filter of the UWB of described novel compact conformation is characterized in that three broadsides of flat " day " word line of rabbet joint 105 are axisymmetric.

The effect of above-mentioned multimode resonator 104 is to produce wider passband, produces the ultra broadband of 3.1-10.6GHz by the length of side of adjusting multimode resonator 104 each limit, to satisfy the scope of FCC definition.

Above-mentioned flat " day " word slot line structure 105 is used for producing trap characteristic, states the size of flat " day " word slot line structure 105 by adjusting with the adjustable characteristic of realization trap, and realizes the compatibility of ultra-wideband communications and narrow-band communication system.

This utility model filter has following characteristic and advantage with respect to existing filter:

Compact conformation, be convenient to integrated, be convenient to realize.

By adjusting the size of multimode resonator 104, can regulate passband in the scope of UWB(3.1-10.6GHz).

The size of flat by adjusting " day " word can be regulated the position of trap.

Description of drawings

Fig. 1 is the basic structure upward view of the utility model embodiment 1;

Fig. 2 is the basic structure vertical view of the utility model embodiment 1;

Fig. 3 is the basic structure end view of the utility model embodiment 1;

Fig. 4 is flat " day " font slot line structure figure of the utility model embodiment 1;

Embodiment

The utility model has designed a kind of single notch filter of UWB of compact conformation, and this filter construction is compact, it is integrated to be convenient to, trap is adjustable.

Giving an example below in conjunction with accompanying drawing, this is described in more detail utility model:

An example of the present utility model as shown in Figure 1.This filter is by medium substrate 106, exploitation counterfoil 101 above the medium substrate, and the metal ground plate below the medium substrate forms.Wherein, medium substrate is that dielectric constant is 10.2 Rogers6010.The thickness of this medium substrate is 1.6mm, has satisfied the requirement of intensity.Microstrip line and the metal ground plate below the medium substrate above the medium substrate all adopt copper product.

As shown in Figure 2, the metal ground plate of the single notch filter of the utility model UWB is comprised of rectangular configuration radiating element 102, co-planar waveguide ground plane 103, multimode resonator 104 and flat " day " word slot line structure 105 of being etched on the multimode resonator.

As shown in Figure 3, the open counterfoil structure above the single notch filter employing of the utility model UWB medium substrate is as the Sir feeder line.

As shown in Figure 4, the trap characteristic of the single notch filter of the utility model UWB is by being that flat " day " word slot line structure realizes, this structure connects the bottom surface by " day " word slot line structure and co-planar waveguide and forms, and is respectively 1052,1053 and 1051.

Change the design parameter of the single notch filter of utility model UWB:

The selection of medium substrate: dielectric constant is 10.2 Rogers6010.Generally between 2--9.8, the dielectric constant that the utility model adopts is 10.2 ceramic aluminum substrate to the dielectric constant of medium substrate, and the material of high dielectric constant makes the guide wavelength of signal less, and circuit also can be done littlely.And the dielectric loss tangent angle that changes substrate is less than 0.002, and such substrate has guaranteed that loss is less.In practice, can adopt the little medium substrate of dielectric constant loss angle according to practical application, such as the dielectric constant loss angle less than 10 ^-3Substrate.The thickness of the medium substrate that the utility model adopts is 1.6mm, satisfies required intensity.

The design of multimode resonator: according to the knowwhy of antenna, the rectangular configuration radiating element of ultra-wideband communications is satisfied in design.Can regulate the physical dimension of rectangular configuration radiating element, rectangular configuration radiating element together ground roll connects coupling slit between the ground etc. designed antenna is optimized, and makes designed filter can satisfy the demand of UWB.

The design of flat " day " word line of rabbet joint: theoretical according to filter theory and microstrip transmission line, calculate resonance frequency, thereby design the size of flat " day " the word line of rabbet joint.This filter can not only be realized the demand of UWB, can also produce trap characteristic simultaneously, realizes radio ultra wide band system and the at present communication for coordination of the narrowband systems of use.Flat " day " word defective ground produces a resonance frequency, can inhibition zone external signal and unwanted parasitic signal, and the phase mutual interference between the reduction system is conducive to the EMC Design of system or equipment.

Claims

1. the single notch filter of the UWB of a compact conformation, comprise the microstrip line (101) and the metal ground plate (103) that are formed at the upper and lower surface of dielectric-slab (106), it is characterized in that, described metal ground plate comprises multimode cavity (104), rectangular radiation unit (102) and is embedded in interior flat " day " the font slot line structure (105) of multimode cavity.

2. the single notch filter of the UWB of described novel compact conformation according to claim 1 is characterized in that, the width of every broadside of described flat " day " word line of rabbet joint equates with the gap between each limit.

3. the single notch filter of the UWB of described novel compact conformation according to claim 1 is characterized in that, three broadsides of flat " day " word line of rabbet joint 105 are axisymmetric.