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Band-pass filter based on tunable one-dimensional filter arrays and design method thereof

A band-pass filter and filter array technology, applied in waveguide-type devices, electrical components, circuits, etc., can solve the problems of low filter Q value, affect device performance, complicated design process, etc. Good frequency selectivity and stable tuning performance

Active Publication Date: 2019-09-27
NO 55 INST CHINA ELECTRONIC SCI & TECHNOLOGYGROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if these EBG structures and substrate-integrated waveguides can be integrated together, the viewpoint of "ultra-wideband bandpass filter" will be obtained, and according to this viewpoint, a fifth-order SIW-EBG bandpass filter scheme is designed, However, there are obvious deficiencies in this scheme: (1) the stop band suppression ability is obviously insufficient; (2) the arrow-shaped bandgap structure mainly utilizes the resonance effect of the periodic unit itself to form a bandgap, which belongs to the resonator mechanism; A wide stopband bandwidth requires a large number of arrow units of different sizes, and the size of the filter is relatively large; (3) The design process is complicated, and there is no analytical formula analysis, which directly affects the performance of the device, and its bandgap characteristics are poor
[0006] Chinese patent application 201610343899 discloses "a reconfigurable substrate-integrated waveguide bandpass filter and its reconfigurable method", although this method can solve the small tuning range and the insertion loss of reconfigurable substrate-integrated waveguide The technical problem that the control voltage of large and varactor diodes cannot be directly added to the substrate integrated waveguide
However, this method cannot be applied to solve the real-time change of the passband frequency, passband bandwidth and stopband frequency of microwave or millimeter-wave bandpass filters and require tunable requirements; and the stopband width of the tunable filter is narrow, and the stopband The depth is not enough, broadband filtering cannot be realized, and the Q value of the filter is not high
[0007] Chinese patent application 201811002114.4 discloses "a miniaturized tunable substrate integrated waveguide filter", which can only solve the frequency tuning of the passband; The value is not high, the out-of-band rejection is insufficient, the reflection loss changes greatly during the frequency tuning process, and the tuning performance is unstable
[0008] To sum up, the prior art cannot simultaneously solve the technical problems of real-time changes in the passband frequency, passband bandwidth and stopband frequency due to the use of the resonance mechanism to design filters. Therefore, how to overcome the existing deficiencies in the prior art has become a One of the key problems to be solved urgently in the field of electromagnetic field and microwave technology

Method used

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  • Band-pass filter based on tunable one-dimensional filter arrays and design method thereof
  • Band-pass filter based on tunable one-dimensional filter arrays and design method thereof
  • Band-pass filter based on tunable one-dimensional filter arrays and design method thereof

Examples

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Embodiment 1

[0076] Example 1. like figure 1 and Figure 10 As shown, a single-layer one-dimensional filter array bandpass filter proposed by the present invention includes an upper metal layer 1, a dielectric substrate 2, a lower metal layer 3, and edge-wrapping metal layers 4 on both side walls of the dielectric substrate 2 , a circular EBG periodic unit 5 , an inner circular metal layer 6 , an input-output transition structure 7 , and a microstrip line 8 . Among them: circular ring (such as Figure 14 Shown) EBG periodic units 5 are etched on the upper metal layer 1, the number of EBG periodic units 5 is preferably not less than 3, generally 3 to 12, the EBG periodic units etched in Example 1 The number of 5 is 10; the microstrip line 8 is connected to the dielectric waveguide cavity through the input-output transition structure 7; the microstrip line 8 and the input-output transition structure 7 are based on the center line of the dielectric substrate 2 in the length direction and w...

Embodiment 2

[0077] Example 2. like figure 2 As shown, a kind of double-deck one-dimensional filter array bandpass filter that the present invention proposes comprises upper metal layer 1, dielectric substrate 2, lower metal layer 3, the edge metal layer 4 of the two sidewalls of dielectric substrate 2, The shape of the medium is a circular EBG periodic unit 5 , an inner circular metal layer 6 , an input-output transition structure 7 , a microstrip line 8 , and a DGS structure 13 . figure 2 Directly below the microstrip line 8 and the input-output transition structure 7 , a rectangular DGS structure 13 is arranged on the center line of the wide side of the lower metal layer 3 . in:

[0078] ring (such as Figure 14 shown) EBG periodic units 5 are respectively etched on the upper metal layer 1 and the lower metal layer 3, the number of EBG periodic units on both the upper and lower metal layers is preferably not less than 3, generally 3 to 12 The number of EBG periodic units etched on...

Embodiment 3

[0079] Example 3. like image 3 , Figure 4 , Figure 5 , Image 6 and Figure 11 As shown, a bandpass filter based on a tunable one-dimensional filter array proposed by the present invention includes an upper metal layer 1, a dielectric substrate 2, a lower metal layer 3, and edge-wrapped metal layers on both side walls of the dielectric substrate 2 4. The EBG periodic unit 5 with a medium shape of a ring, the inner metal layer 6, the input-output transition structure 7, the microstrip line 8, the anti-pad 9, the inner metal layer pad 10, and the varactor chip 11 , metal via 12 , DGS structure 13 . image 3 Directly below the microstrip line 8 and the input-output transition structure 7 , a rectangular DGS structure 13 is arranged on the center line of the wide side of the lower metal layer 3 . image 3 The shown tunable mechanism includes an anti-pad 9 , an inner circle metal layer pad 10 , a varactor diode chip 11 and a metal via 12 . in:

[0080] ring (such as Fi...

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Abstract

The invention relates to a band-pass filter based on tunable one-dimensional filter arrays, comprising a microstrip line, an input-output transition structure, a dielectric waveguide and characterized by further comprising tunable one-dimensional filter arrays which are symmetrically disposed on the wide-side central line of the upper metal layer and the wide-side central line of the lower metal layer of the dielectric waveguide or a substrate integrated waveguide cavity so as to face to each other and which are each arranged in a linear shape; wherein each tunable one-dimensional filter array includes at least three annular one-dimensional filter units; an anti-pad and an inner circular metal layer pad are disposed at a midpoint of a central line between adjacent one-dimensional filter units on the upper metal layer; the inner circular metal layer pad is connected to the upper metal layer through a varactor chip; and a metal via hole is disposed on the center of the inner metal layer pad and extend to the lower metal layer. The design method of the present invention can meet the requirement for simultaneous and real-time variation of the pass-band frequency, the pass-band bandwidth and the stop-band frequency of a microwave millimeter wave band-pass filter.

Description

technical field [0001] The invention belongs to the field of electromagnetic field and microwave technology, in particular to a band-pass filter based on a tuneable one-dimensional filter array and a design method thereof. Background technique [0002] The microwave and millimeter wave bandpass filter is the key and core component of the microwave and millimeter wave system, and its performance directly determines whether the system can work normally. As the available electromagnetic spectrum becomes more and more crowded, electromagnetic interference and electromagnetic compatibility issues become more and more prominent, which puts more stringent requirements on the performance of RF filters. [0003] As a waveguide-like structure, the dielectric waveguide includes a substrate dielectric waveguide and a substrate integrated waveguide (SIW). Without sacrificing the performance of the filter, the dielectric waveguide can greatly reduce the size of the waveguide filter; it ha...

Claims

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Application Information

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IPC IPC(8): H01P1/203H01P11/00
CPCH01P1/2002H01P11/007
Inventor 张华
Owner NO 55 INST CHINA ELECTRONIC SCI & TECHNOLOGYGROUP CO LTD
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