CN202550038U

CN202550038U - Ultra-wide bandwidth (UWB) dual-notch filter with steep notch

Info

Publication number: CN202550038U
Application number: CN201120518567XU
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 bandwidth (UWB) dual-notch filter with steep notches, which belongs to a micro-strip filter. The filter consists of 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 dual-notch characteristic and the frequencies of the notches are about 5.2 GHz and 5.8 GHz. Therefore, the interference of WLAN signals on UWB can be filtered. The filter has the advantages of steep notches, simple design, compact structure, small volume, convenient machining, low cost and adjustable notch characteristic.

Description

The two notch filters of the UWB that a kind of trap is precipitous

Technical field

The utility model relates to the two notch filters of the precipitous UWB of a kind of trap, and 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 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, and trap is non-adjustable.So precipitous, the compact dimensions of filter trap of design, the UWB band pass filter that trap is adjustable have great importance.

The utility model content

The purpose of the utility model is to provide that a kind of trap is precipitous, small size, have two trap characteristics and the adjustable filter of trap; This filter can reduce the interference of WLAN 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:

The two notch filters of the UWB that a kind of trap is precipitous comprise the open counterfoil 101 and metal ground plate 103 that are formed at dielectric-slab 106 upper and lower surfaces, it is characterized in that, said metal ground plate 103 comprises that multimode cavity 104 refers to the line of rabbet joint 105 structures with inserting.

Said novel two trap UWB filters is characterized in that, the width of each broadside of the described slotting finger line of rabbet joint equates, and the gap between each limit equates.

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.

The above-mentioned slotting finger slot line structure 105 that has two counterfoils is used for producing trap characteristic, and the size of stating the slotting finger slot line structure 105 that has counterfoil 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 that has a slotting finger line of rabbet joint of two counterfoils through adjustment 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 has the slotting finger slot line structure figure of counterfoil for the bandlet of the utility model embodiment 1;

Embodiment

The utility model has designed the two notch filters of the precipitous UWB of a kind of trap, 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 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 two notch filters of the precipitous UWB of the utility model trap is DGS, is made up of rectangular configuration radiating element 102, co-planar waveguide ground plane 103, multimode resonator 104 and the slotting finger slot line structure 105 that has two counterfoils that is etched on the multimode resonator.

As shown in Figure 3, the open counterfoil structure above the two notch filters employing of the UWB that this practical trap the is precipitous medium substrate is as the Sir feeder line.

As shown in Figure 4; The trap characteristic of the two notch filters of UWB that the utility model trap is precipitous is by realizing for the slotting finger slot line structure that has two counterfoils; This structure connects the bottom surface by slotting finger slot line structure that has two counterfoils and co-planar waveguide to be formed, and is respectively 1052,1053 and 1051.

Change the design parameter of the two notch filters of the precipitous UWB of utility model trap:

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.

Have the design of the slotting finger line of rabbet joint of counterfoil: theoretical according to filter theory and microstrip transmission line, calculate resonance frequency, thereby design the size of the slotting finger line of rabbet joint that has counterfoil.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 slotting finger defective ground that has counterfoil produces 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. the two notch filters of the UWB that a trap is precipitous; Comprise the open counterfoil (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 said metal ground plate (103) comprises multimode cavity (104) and inserts the finger line of rabbet joint (105) structure.

2. according to the said novel two trap UWB filters of claim 1, it is characterized in that the width of each broadside of the described slotting finger line of rabbet joint equates, and the gap between each limit equates.