Millimeter-wave bandpass filter with ultra-wide stop band
A band-pass filter and millimeter-wave technology, applied in waveguide devices, electrical components, circuits, etc., can solve problems such as easy introduction of clutter, large filter insertion loss, and insufficient flatness, and achieve system miniaturization, The effect of good transition zone and steep transition zone
Active Publication Date: 2018-11-02
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology
[0004] However, the ultra-wideband filter based on the microstrip vertical transition structure has poor harmonic suppression, which makes the parasitic passband outside the passband obvious, and the stopband is extremely narrow. In practical applications, it is easy to introduce clutter, causing mutual interference
In addition, the group delay in the passband of most ultra-wideband filters at present is relatively large, and the flatness is not enough, which will cause the phase relationship disorder of the signal arriving at the receiving end due to the phase shift or delay of each frequency component, that is, the phase distortion
In order to make the ultra-wideband filter have a better transition band and better stop band performance, multi-stage cascading is usually used, which not only leads to a large insertion loss of the filter, but also sacrifices the overall size of the filter, which is not conducive to the miniaturization of the system. change
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[0031] In the millimeter-wave bandpass filter with an ultra-wide stop band provided in this embodiment, the material of the upper substrate 7 and the lower substrate 8 is Rogers RT / duroid 5880, and the size is 4.5×10mm 2 , the thickness is 0.254mm, the relative dielectric constant is 2.2, and the loss tangent is 0.0009; the metal layer thickness of the first, second, third, fourth, fifth, and sixth microstrip lines is 17μm, and the material is copper; the first microstrip line 1 has a length of 5mm and a width of 0.67mm, the second microstrip line 2 has a length of 2.49mm and a width of 1.29mm, the third microstrip line 3 has a length of 1.51mm and a width of 2mm, and the fourth microstrip line 4 The length is 5mm and the width is 0.67mm, the length of the fifth microstrip line 5 is 0.63mm, and the width is 0.13mm, the length of the sixth microstrip line 6 is 2.67mm, and the width is 2mm; the material of the common ground metal plate 9 It is metallic copper with a thickness of...
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The invention relates to a millimeter-wave bandpass filter with an ultra-wide stop band. An open-circuit branch of a high-low-impedance cascade is adopted in a lower microstrip line structure, the low-pass characteristic of the high-low-impedance microstrip line is used for generating a transmission zero point for a high-frequency signal; an open-circuit branch with a stepped impedance cascade isadopted in an upper microstrip line structure, so as to realize better broadband matching and to obtain an ultra-wideband filter with low insertion loss, steep transition band, ultra-wide stop band, and low group delay. At the same time, the length of the stepped impedance microstrip line in the upper microstrip line is different from the length of the high-low impedance microstrip line in the lower layer microstrip line; such an asymmetric structure not only can satisfy good matching of the upper and lower microstrip lines with a trough line resonator in the middle, but also can increase a transmission pole in the filter passband; the transmission zero point is increased in the filter high-frequency stopband so that the ripple waves in the passband of the filter are better, and good transition zone and better stopband performance are achieved.
Description
technical field [0001] The invention relates to a band-pass filter, in particular to a millimeter-wave band-pass filter with an ultra-wide stop band. Background technique [0002] The contradiction between the continuous increase of new communication systems and the limited spectrum resources continues to deepen. Not only does it need to improve the utilization rate of the original frequency, but also new technologies with higher capacity and faster speed need to be invented urgently. Ultra-wideband technology has been placed high expectations by all walks of life due to its unique and excellent performance, and has become one of the technologies with the most application potential in communication systems in the past ten years. As the core component of the UWB system front-end, the UWB filter's performance will directly have a major impact on the entire system, and has become a research hotspot. [0003] In order to ensure that adjacent ultra-wideband systems cannot interf...
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CPCH01P1/203
Inventor张波刘洋丰益年纪东峰杨益林杨珂牛中乾周天驰
OwnerUNIV OF ELECTRONIC SCI & TECH OF CHINA