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Miniaturized band-pass filter with harmonic suppression for loading fan-shaped offset of microstrip

A band-pass filter and harmonic suppression technology, which is applied in the electronic field, can solve the problems of increasing the difficulty of the process and unfavorable circuit integration, etc., and achieve the effect of easy implementation and reduced volume

Inactive Publication Date: 2006-12-06
SHANGHAI JIAO TONG UNIV
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  • Claims
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Problems solved by technology

Although this method achieves the expected purpose, the volume and weight of the device do not increase, but the structure etched on the ground plate increases the difficulty of the process. At the same time, the etched ground plate must be far away from the metal, which brings packaging problems. , is also not conducive to integration with other circuits

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  • Miniaturized band-pass filter with harmonic suppression for loading fan-shaped offset of microstrip
  • Miniaturized band-pass filter with harmonic suppression for loading fan-shaped offset of microstrip
  • Miniaturized band-pass filter with harmonic suppression for loading fan-shaped offset of microstrip

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Embodiment Construction

[0013] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0014] figure 1 It is a topological structure diagram of the bandpass filter of the present invention. figure 1 An example of three electromagnetic bandgap cells is given in . The realization method of the bandpass filter of the present invention is to introduce a coupling gap in the middle of the microstrip electromagnetic bandgap structure containing an odd number of electromagnetic bandgap units. Such as figure 1 As shown, three electromagnetic bandgap units form a microstrip symmetric electromagnetic bandgap structure. Each electromagnetic bandgap unit is obtained by loading a fan-shaped microstrip branch structure on the upper and lower sides of the microstrip line. symmetry. An electromagnetic bandgap unit in the center of the microstrip symmetric electromagnetic bandgap structure introduces a coupling gap, so that the electromagneti...

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Abstract

Miniaturized harmonic suppression type band-pass filter includes symmetrical electromagnetic band gap structure of microstrip composed of odd pieces of band gap unit. Loading fan-shaped microstrip branched structure on two sides of microstrip line obtains symmetrical band gap unit symmetrical in up down, and left and right. Coupling slot is introduced in a band gap unit in center of the symmetrical band gap structure. Thus, the band gap unit is divided into total identical two parts in horizontal direction to form two parts with identical resonance frequencies symmetrical to slot so as to establish resonant-type band-pass filter, as well as its center frequency and stopband characteristic. The coupling slot is equivalent to coupling capacitance. The disclosed band-pass filter possesses selected ultra wide stop band, and makes high order harmonics be fallen on range of stop band. Moreover, since effect of slow wave, size of filter is reduced greatly.

Description

technical field [0001] The invention relates to a miniaturized harmonic suppression bandpass filter loaded with fan-shaped microstrip branches, which is a miniaturized microstrip bandpass filter capable of suppressing second and third harmonics, and belongs to the field of electronic technology. Background technique [0002] Bandpass filters are used in microwave and millimeter wave circuits and systems, especially narrowband bandpass filters, which are widely used in modern communication systems. In practical applications, small size and light weight have increasingly become important indicators for filters to be considered. As the planar filter can adopt the printed circuit technology, it is easy to realize the requirements of small size and light weight, and it has been widely concerned in practical applications. At the same time, in order to enhance the anti-interference of the circuit and improve the performance of the circuit, the band-pass filter is required to have ...

Claims

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Application Information

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IPC IPC(8): H01P1/212H01P1/203
CPCH01P1/2005
Inventor 毛军发张文梅
Owner SHANGHAI JIAO TONG UNIV
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