Compact broadband differential band pass filter

Abstract

The invention discloses a compact broadband differential band pass filter. The band pass filter comprises a pair of half-wavelength coupling microstrip lines, two pairs of feed lines, a central microstrip line, and two pairs of capacitors; the half-wavelength coupling microstrip lines are arranged side by side, the perpendicular bisectors of the half-wavelength coupling microstrip lines are overlapped, and a bar-shaped slit is formed between the half-wavelength coupling microstrip lines; the two pair of feed lines are arranged corresponding to the pair of half-wavelength coupling microstrip lines, each pair of feed lines is connected to the two ends of the corresponding half-wavelength coupling microstrip line, and the two pairs of the feed lines are symmetrically distributed in the two sides of the perpendicular bisector of the half-wavelength coupling microstrip lines; the central microstrip line is connected between the half-wavelength coupling microstrip lines and symmetric by taking the perpendicular bisector of the half-wavelength coupling microstrip lines as the center; and the two pairs of capacitors are loaded between the half-wavelength coupling microstrip lines, and symmetrically arranged in the two sides of the half-wavelength coupling microstrip lines. The filter is simple in structure, smaller in size, sufficient in bandwidth and extremely low in loss.

Description

technical field [0001] The invention relates to the field of microwave communication, in particular to a compact broadband differential bandpass filter. Background technique [0002] With the rapid development of wireless communication technology, the data transmission rate is getting higher and higher, and the wireless communication system is developing towards the direction of broadband, miniaturization, low loss and high integration. At the same time, the improvement of the integration level of the wireless system has exacerbated problems such as signal crosstalk and environmental noise, so that differential circuits have received extensive attention to improve such problems. Microwave filters are an important part of wireless communication systems. Therefore, differential filters with broadband, miniaturization, and low loss meet the development needs of wireless communication systems. However, the design of such differential filters is still an important issue at presen...

AI Technical Summary

Problems solved by technology

Therefore, the existing technology is difficult to guarantee the realization of miniaturization, broadband and low loss at the same time

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