CN202550036U

CN202550036U - Ultra-wide band (UWB) filter having ultra-narrow band notch characteristic

Info

Publication number: CN202550036U
Application number: CN2011205184535U
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: 2012-11-21
Anticipated expiration: 2021-12-10

Abstract

The utility model discloses an ultra-wide band (UWB) filter having an ultra-narrow band notch characteristic, which belongs to a micro-strip filter. The filter comprises a dielectric substrate, a micro-strip structure provided with an open stub and arranged on the upper surface of the dielectric substrate, and a metal earth plate arranged on the lower surface of the dielectric substrate. The radiation unit of the filter adopts a rectangular structure etched on the earth plate, and an open stub structure arranged on the upper surface of the dielectric substrate to form a coplanar waveguide fed structure. According to the utility model, the passband width required by UWB is realized through a multi-mode resonator, and a winding trough line structure is etched at the periphery of the rectangular radiation unit by adopting a defected ground structure so as to realize the notch characteristic. Thus, the filter is designed to meet the requirement of the cooperative operation of an ultra-wide band communication system and a narrow-band system. The filter has a good notch characteristic and the frequency of the notch is about 6.8. Therefore, the interference of RFID signals on UWB can be filtered. The filter has the advantages of ultra-narrow band notches, simple design, compact structure, small volume, convenient machining, low cost and adjustable notch characteristic.

Description

UWB filter with ultra arrowband trap characteristic

Technical field

The utility model discloses a kind of UWB filter with ultra arrowband trap characteristic, this filter can be used for the interference of RFID 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 possibly receive the interference such as WiAX (3.5-GHz), WLAN (5.2-and 5.8-GHz), RFID signals such as (6.8GHz).Therefore the filter that has trap characteristic has very high practical value.

Occurred some mentalities of designing in recent years, like multimode resonator (MMR), via structure etc., though this writes the effect that structure can realize trap, the size of these structures is bigger, the broader bandwidth of the non-adjustable and trap of trap.So the UWB band pass filter that design size is compact, trap is adjustable, trap is narrower has great importance.Realized the effect of trap though the patent No. is the patent of 200820105333.0 inventions, the broader bandwidth of trap has reduced the utilance of UWB in filtering.The utility model has reached the characteristic that realizes ultra narrow trap.

The utility model content

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

The technical scheme that the utility model adopted:

A kind of single notch filter of UWB with ultra arrowband trap characteristic; Comprise be formed on the dielectric-slab 106, the open counterfoil 101 and the metal ground plate 103 of lower surface; It is characterized in that said metal ground plate 103 comprises multimode cavity 104 and the line of rabbet joint 105 structures of wriggling.

According to the said novel UWB filter of claim 1, it is characterized in that the width of each broadside of the said sinuous line of rabbet joint equates, and equate with gap between each limit with ultra arrowband trap characteristic.

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

Above-mentioned sinuous slot line structure 105 is used for producing trap characteristic, and the size of stating the slot line structure 105 of wriggling through adjusting is with the adjustable characteristic of realization trap, and the compatibility of realization 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.

Through the size of adjustment multimode resonator 104, can regulate the scope of passband at UWB (3.1-10.6GHz).

The size of flat through adjusting " day " word can be regulated the position of trap, and the bandwidth of this trap is ultra narrow.

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 the sinuous slot line structure figure of the utility model embodiment 1;

Embodiment

The utility model has designed the UWB filter with ultra arrowband trap characteristic, and this filter construction is compact, it is integrated to be convenient to, trap is adjustable, trap is ultra narrow.

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

An instance of the utility model is 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 is formed.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.Open counterfoil above the medium substrate and the metal ground plate below 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 a DGS, is made up of rectangular configuration radiating element 102, co-planar waveguide ground plane 103, multimode resonator 104 and the sinuous slot line structure 105 that is etched on the multimode resonator.

As shown in Figure 3, the UWB filter that the utlity model has ultra arrowband trap characteristic adopts open counterfoil structure above the medium substrate as the Sir feeder line.

As shown in Figure 4, the trap characteristic of UWB filter that the utlity model has ultra arrowband trap characteristic is by realizing that for the slot line structure of wriggling this structure connects the bottom surface by sinuous slot line structure and co-planar waveguide to be formed, and is respectively 1052,1053 and 1051.

The design parameter of the single notch filter of this 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 aluminium base to the dielectric constant of medium substrate, and the material of high dielectric constant makes the guide wavelength of signal littler, and circuit also can be done forr a short time.And the dielectric loss tangent angle that changes substrate is less than 0.002, and such substrate has guaranteed that loss is less.In reality, can adopt the little medium substrate of dielectric constant loss angle according to practical application, like the substrate of dielectric constant loss angle less than 10-3.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 ground roll together connects coupling slit between the ground etc. the antenna that is designed is optimized, and makes the filter that is designed can satisfy the demand of UWB.

The design of the sinuous line of rabbet joint: theoretical according to filter theory and microstrip transmission line, calculate resonance frequency, thereby design the size of the line of rabbet joint that wriggles.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 communication for coordination of the narrowband systems of use at present.The defective of wriggling ground produces a resonance frequency, can suppress out of band signal and unwanted parasitic signal, and the phase mutual interference between the reduction system helps the EMC Design of system or equipment.

Claims

1. single notch filter of the UWB with ultra arrowband trap characteristic; Comprise the open counterfoil (101) and the metal ground plate (103) that are formed at (106), lower surface on the dielectric-slab; It is characterized in that said metal ground plate (103) comprises multimode cavity (104) and the line of rabbet joint (105) structure of wriggling.

2. according to the said novel UWB filter of claim 1, it is characterized in that the width of each broadside of the said sinuous line of rabbet joint equates, and equate with gap between each limit with ultra arrowband trap characteristic.