microwave bandpass filter

A filter and microwave band technology, applied in waveguide devices, electrical components, circuits, etc., can solve the problems of high-performance broadband filters, complex filter structures, and poor performance, etc., and achieve simple structure, square coefficient Small and easy to process

CN103219572BInactive Publication Date: 2015-10-28NANJING UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2015-10-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a microwave band-pass filter which comprises a substrate with through holes and a magnetic photonic crystal which is composed of a plurality of permanent magnetic ferrite columns. The permanent magnetic ferrite columns are arranged in the through holes. The microwave band-pass filter has the filter characteristics of being wide in frequency band, high in out-of-band rejection, and smooth in band, and meanwhile has the advantages of being small in size, simple in structure, easy to process, low in cost, easy to achieve, and the like.
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Description

technical field

[0001] The invention relates to a band-pass filter, in particular to a microwave band-pass filter, and more specifically to a magnetic photonic crystal band-pass filter. Background technique

[0002] In high-performance communication systems, filters with low loss and high power capacity play an important role. In order to ensure the transmission of the signal waveform without distortion, a high-performance filter with small square factor and flat in-band is one of the essential devices. In recent years, as broadband communication technology has received more and more attention, the application of broadband filters has become more and more important. Broadband filters in the microwave segment can be realized by a variety of structures, such as microstrip lines, waveguides, etc., but the filters of these structures are often either complex in structure and expensive in cost or not good enough in performance, which cannot meet the requirements of high-performa...

Examples

Embodiment Construction

[0021] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0022] figure 1 It shows the microwave bandpass filter according to the present invention. In this embodiment, it mainly includes a magnetic photonic crystal and a foam material composed of 5*5 strontium-permanent ferrite cylinders (referred to as "magnetic cylinders") The base material, strontium-permanent ferrite cylinders are located in the through holes of the foam material. The magnetic photonic crystal is a tetragonal lattice, a is the lattice constant, and r is t...