Ultra-wideband filter based on defected ground structure

Abstract

The invention provides an ultra-wideband filter based on a defected ground structure, which comprises a substrate and a transmission copper wire arranged on the top surface of the substrate, and is characterized in that the transmission copper wire comprises an end connecting part, a square part and a groove-shaped notch part, the end connecting part is connected with the groove-shaped notch part through the square part, and the transmission copper wire is symmetrical by taking the central axis of the groove-shaped notch part as a symmetry axis; and the groove-shaped notch part is connected with three grounding stubs. According to the invention, the multi-order grounding stub can be utilized to generate an ultra-wideband passband, the cascade bias resonant ring can suppress higher harmonics, a wide stop band is realized, an H-shaped defected ground structure of the loading capacitor is utilized to generate a transmission zero point at a lower cut-off frequency, and two convex defected ground structures with different sizes are utilized to generate two trapped waves in the passband, so that the band-pass filter can be used for filtering the band-pass filter. The pulse signal suppression device is scientific and reasonable in structural design, low in cost and capable of being popularized and used.

Description

technical field [0001] The present invention relates to a filter, in particular to an ultra-wideband filter based on a defective ground structure. Background technique [0002] In recent years, the operating frequency of wireless communication technology has risen to gigahertz (GHz), and more and more frequency bands are occupied, resulting in crowded spectrum and waste of resources. In response to this problem, the United States Federal Communications Commission (FCC) defined an ultra-wideband (UWB, Ultra-wideband) signal in 2002, and stipulated that the commercial frequency band of UWB is 3.1GHz to 10.6GHz. The performance of the filter ensures the stability of the UWB system. The design bandwidth of the filter for this frequency band is not less than 110%, and the high and low stop bands of the filter are required to have a better suppression effect. And there are some other existing narrow-band communication systems in the UWB frequency band, including wireless local ar...

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Problems solved by technology

Moreover, there are some existing other narrowband communication systems in the UWB frequency band, including wireless local area network WLAN (5.15~5.35GHz and 5.725~5.85GHz), X-band satellite communication system (7.25~7.75GHz and 7.9~8.395GHz), global microwave Interconnection access system Wimax(3.4~3.6GHz), RFID(5.8GHz), etc., these wireless communication signals will cause interference to UWB system

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