Ultra-wideband band-pass filter

Abstract

The invention discloses an ultra-wideband band-pass filter which comprises a medium, a transmission line, two grounded inductors, two via holes, a plurality of split ground structure units and a plurality of rectangular defected ground structure units. The transmission line is arranged in the middle of the upper layer of the medium, one end of the transmission line is connected with an input port, the other end of the transmission line is connected with an output port, the two grounded inductors are symmetrically distributed on the two sides of the transmission line and are perpendicularly connected with the midpoint of the transmission line respectively, the other ends of the grounded inductors are respectively connected with one via hole, and the via holes perpendicularly penetrate to the lower layer of the medium from the upper layer of the medium. The split ground structure units are sequentially etched on the lower layer of the medium in the direction of the transmission line, one rectangular defected ground structure unit is etched between every two adjacent split ground structure units, and the split ground structure units and the rectangular defected ground structure units are all perpendicular to the transmission line. According to each split ground structure unit, the two ends of a dumbbell defected ground structure are respectively provided with a gap in an etched mode. The gaps are perpendicularly connected with the midpoints of the borders at the two ends, and extend to the edge of the medium all the time. The ultra-wideband band-pass filter is high in performance, low in cost, small in size, and wide in application prospect.

Description

technical field [0001] The invention relates to the technical field of filters, in particular to an ultra-wideband bandpass filter. Background technique [0002] Since February 2002, the US Federal Communications Commission (FCC) lifted the ban on the frequency band between 3.1-10.6 GHz, academia and industry have caused a wave of research on ultra-wideband (Ultra wideband, UWB) wireless systems. The quality of UWB filter performance often directly affects the performance index of the entire communication system. The rapid development of mobile communication has put forward higher and higher requirements for the electrical performance, miniaturization, cost, and stability of microwave devices. In order to obtain better performance while the device is miniaturized and low cost. In recent years, some new techniques have been proposed to design UWB filters. For example, cascading high-pass and low-pass filters to form a UWB filter can achieve better sideband suppression, but...

AI Technical Summary

Problems solved by technology

In New Progress in the Development of Compact HighPerformance Microwave Ultra-Wideband (UWB) Filters, Chen Chun-Ping et al. used Z-transform technology to realize wide-band filters, and used two open-circuit branches in parallel to generate a zero point in the upper and lower stop bands, which is very good The attenuation effect, but its disadvantage is that the formula is complicated, the filter reaches 4cm, the volume is large and the cost is high

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