Sine windowing electromagnetism band gap band-stop filter

A band-stop filter and electromagnetic bandgap technology, which is applied to waveguide-type devices, circuits, electrical components, etc., can solve the problems of high reflection side lobes, large passband ripples, and unfavorable electromagnetic wave transmission, and achieves a simple manufacturing process and reduces the cost of electromagnetic waves. Small truncation error, the effect of improving the frequency domain response

Inactive Publication Date: 2014-02-05
RES INST OF XIAN JIAOTONG UNIV & SUZHOU
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The band-stop filter made of electromagnetic bandgap structure has the disadvantages of large passband ripple and high reflection sidelobe, which is not conducive to the transmission of electromagnetic waves in the passband

Method used

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  • Sine windowing electromagnetism band gap band-stop filter
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  • Sine windowing electromagnetism band gap band-stop filter

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Embodiment

[0029] This embodiment describes a sinusoidal windowed electromagnetic bandgap bandstop filter. The filter includes a microstrip line structure on the upper layer, a dielectric substrate on the middle layer, and a grounded metal surface on the lower layer. The microstrip line structure on the upper layer is attached to the middle dielectric On the upper surface of the board, the ground metal surface is attached to the lower surface of the intermediate dielectric board, and the upper microstrip line structure includes input ports, output ports at both ends, and periodic microstrip lines modulated by a window function. The periodic microstrip line is a microstrip line unit of 5 sinusoidal periodic structures modulated by a windowing function.

[0030] The dielectric substrate used in the dielectric substrate in this embodiment is a dielectric constant of 3.5, the thickness of the dielectric substrate is 1.5 mm, the microstrip conductor and periodic microstrip line are copper clad...

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Abstract

The invention discloses a sine windowing electromagnetism band gap band-stop filter which comprises an upper-layer microstrip line structure, a middle-layer medium substrate and a lower-layer grounding metal face. The upper-layer microstrip line structure is attached to the upper surface of the middle medium substrate and the grounding metal face is attached to the lower surface of the middle medium substrate. The upper-layer microstrip line structure comprises an input port, an output port and a periodical microstrip line which is modulated by a windowing function, wherein the input port and the output port are formed in the two ends of the upper-layer microstrip line structure. The weighting technology with a grounded flaw face is directly applied to microstrip transmission line design of the one-dimension sine EBG band-stop filter. A signal is weighted through a window function, thus, truncation errors generated when limited truncation is carried out on an infinite time-domain signal are reduced. Thus, under the condition that performances of the device are not changed, the device can be miniaturized through a small sine periodical amount. Passband ripples and reflected sidelobe performances of the band-stop filter are improved, thus, the manufacturing technology of the sine windowing electromagnetism band gap band-stop filter is simpler.

Description

technical field [0001] The invention relates to a sinusoidal windowed electromagnetic bandgap bandstop filter. Background technique [0002] Filters are widely used in communication systems, especially in wireless communication systems. They can realize functions such as image elimination, harmonic suppression, and channel selection to ensure communication quality, and play a very important role in communication systems. Among them, the band-stop filter is a filter that suppresses signals in a certain frequency band and allows signals outside the frequency band to pass. It can be used in wireless communication systems to suppress the spurious spectrum of high-power transmitters and nonlinear power amplifiers, as well as the parasitic passband of band-pass filters. [0003] Electromagnetic Band Gap (EBG) is a periodic structure with obvious bandgap characteristics, which can prevent electromagnetic waves in certain frequency bands from passing through it, suppress the inter-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/212H01P1/203H01P1/20
Inventor 王兆宏李金逵韩超
Owner RES INST OF XIAN JIAOTONG UNIV & SUZHOU
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