A Novel Differential Broadband Filter

Abstract

The invention provides a novel differential type broadband filter. The novel differential type broadband filter comprises a substrate, and a first port, a second port, a third port, a fourth port, a first transmission line, a second transmission line, and a third transmission line which are arranged on the substrate, wherein the first port, the first transmission line, the second transmission line, the third transmission line and the fourth port are connected in sequence; the second port is connected to the common node of the first transmission line and the second transmission line; the third port is connected to the common node of the second transmission line and the third transmission line; the first port and the second port form a first differential type port; the third port and the fourth port form a second differential type port; and the first transmission line, the second transmission lien and the third transmission line are all half-wavelength transmission lines. The novel differential type broadband filter has the beneficial effects of simple structure and small circuit design area, and can realize high common mode suppression in the passband.

Description

technical field [0001] The invention relates to the field of microwave communication, in particular to a novel differential broadband filter. Background technique [0002] Nowadays, with the rapid development of radio frequency systems, differential circuits are widely used because of their advantages of being able to transmit differential-mode signals and suppress common-mode signals. The filter is an important device in the microwave circuit, so the research on the differential filter is also very important. However, most of the current research on differential filters is based on a symmetrical structure, the design structure is relatively complicated, and the circuit design area is relatively large, resulting in relatively high processing costs. On the contrary, the asymmetric structure greatly reduces the design area of ​​the circuit, and compared with the symmetrical structure, the design structure is also simpler. Therefore, it is particularly important to design a d...

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Problems solved by technology

However, these designs often do not provide good common-mode rejection in the passband

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