CN202712389U

CN202712389U - UWB three-notching filter

Info

Publication number: CN202712389U
Application number: CN 201120518788
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 relates to a three-notching UWB 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 UWB three-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; an interdigital slot line structure with stubs is etched around the rectangular radiation unit so as to generate a 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 three-notching characteristic, with the three-notching characteristic, the filter can filer interferences of WLAN signals and RFID signals on the UWB in the vicinities of 5.2 GHz, 5.8 GHz and 6.8 GHz. The filter is advantageous in simplicity, compact structure, small volume, convenient processing, low cost, and adjustable notching positions.

Description

A kind of UWB three notch filters

Technical field

The utility model relates to a kind of UWB three notch filters, and this filter can be used for the interference of the interior WLAN signal of filtering UWB and RFID signal.

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.Although the patent No. be 201010535277 the invention patents obtained good trap effect, a filtering WLAN signal.The utility model can be realized the function of while filtering WLAN signal and RFID signal.

The utility model content

The purpose of this utility model is to provide a kind of small size, with three trap characteristics and the adjustable filter of trap, this filter can reduce WLAN signal and RFID 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:

A kind of three trap UWB filters, it is characterized in that, it comprises the Metal Substrate floor 103 below medium substrate 106, the microstrip line above the medium substrate 101, the medium substrate, and described metal ground plate comprises multimode cavity 104, rectangular radiation unit 102 and is embedded in the interior slotting finger line of rabbet joint 105 structures of resonant cavity.

According to claim 1, described three novel trap UWB filters is characterized in that, the width of every broadside of the described slotting finger line of rabbet joint with counterfoil equates with the gap between each limit.

According to claim 1, described three trap UWB filters is characterized in that, are axisymmetric with three broadsides of the slotting finger line of rabbet joint of counterfoil.

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 slotting finger slot line structure 105 with counterfoil is used for producing trap characteristic, states with the size of the slotting finger slot line structure 105 of counterfoil realizing the adjustable characteristic of trap by adjusting, 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 at UWB(3.1-10.6GHz) scope.

Can regulate the position of trap with the size of the slotting finger line of rabbet joint of counterfoil by adjustment.

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 slotting finger slot line structure figure that the bandlet of the utility model embodiment 1 has counterfoil;

Embodiment

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

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

As shown in Figure 4, the trap characteristic of the utility model UWB three notch filters is by being that slotting finger slot line structure with counterfoil realizes, this structure forms by connecing the bottom surface with the slotting finger slot line structure of counterfoil and co-planar waveguide, is respectively 1052,1053 and 1051.

Change the design parameter of utility model UWB three notch filters:

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.

Design with 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 with the slotting finger line of rabbet joint of 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 at present communication for coordination of the narrowband systems of use.Slotting finger defective ground with counterfoil produces 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. trap UWB filter, it is characterized in that, it comprises the Metal Substrate floor (103) below medium substrate (106), the microstrip line above the medium substrate (101), the medium substrate, and described metal ground plate comprises multimode cavity (104), rectangular radiation unit (102) and is embedded in the interior slotting finger line of rabbet joint (105) structure of resonant cavity.

2. described three novel trap UWB filters according to claim 1 is characterized in that, the width of every broadside of the described slotting finger line of rabbet joint with counterfoil equates with the gap between each limit.

3. described three trap UWB filters according to claim 1 is characterized in that, are axisymmetric with three broadsides of the slotting finger line of rabbet joint of counterfoil.