An Octagonal Ultra-Wideband Microstrip Filter Based on Defective Ground Structure

Abstract

The invention discloses an octagonal ultra-wideband microstrip filter based on a defected ground structure. The ultra-wideband filter comprises an upper signal layer, a middle metal grounding layer and a bottom signal layer which are successively arranged. The upper signal layer comprises a medium substrate, a first input / output port, a second input / output port, a first octagon transmission unit and a second octagon transmission unit. The middle metal grounding layer comprises a first octagon defect unit and a second octagon defect unit. The bottom signal layer comprises the medium substrate,a third octagon transmission unit, a fourth octagon transmission unit, a uniform microstrip transmission line and an open circuit stub line. In the invention, the strong coupling effect of an octagonal defected-ground coupled transmission line is used to realize a ultra wide band, an open circuit branch knot is used to realize ultra wide out-of-band harmonic wave suppression, the design is simple,processing is convenient and cost is low.

Description

technical field [0001] The invention belongs to the technical field of microwave transmission devices, in particular to an octagonal ultra-wideband microstrip filter based on a defect ground structure. Background technique [0002] With the rapid development of wireless communication technology, people put forward higher requirements for the data transmission rate and confidentiality of wireless communication systems. UWB technology emerges as a key technology. In 2002, the Federal Communications Commission of the United States agreed to use 3.1GHz to 10.6GHz for commercial use, which opened the door to the rapid development of ultra-wideband technology. Because UWB technology has the advantages of low cost, fast transmission rate, good security, and low power consumption, UWB technology has shown huge market value and broad application prospects. As an important part of UWB communication system, UWB filter has a great influence on the performance of the whole communicatio...

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Problems solved by technology

[0003] There are many ways to realize ultra-wideband filters. At present, there are mainly: 1. Use high-pass filter and low-pass filter cascade to realize ultra-wideband, but its structure is complex and bulky, which is not conducive to integration; 2. Based on short-circuit stub loading transmission line structure, this type of filter has a large size and poor selectivity; 3. It adopts a multi-mode structure, but this structure is complex in design, difficult to process, and poor in reliability

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