Novel differential type broadband filter
A differential and filter technology, applied in the field of differential broadband filters, can solve the problem of not being able to provide good common mode rejection in the passband, and achieve the effects of simple structure, good common mode rejection, and small circuit design area.
Active Publication Date: 2016-10-12
南通博士汇创新技术转移有限公司
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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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Embodiment 1
[0021] Please refer to Figure 1 to Figure 2 , in this preferred embodiment, the novel differential broadband filter includes: a substrate and a first port A+, a second port A-, a third port A+, a fourth port B-, and a first port arranged on the substrate. A transmission line 10, a second transmission line 20, and a third transmission line 30, the first port A+, the first transmission line 10, the second transmission line 20, the third transmission line 30, and the fourth port B- in sequence connection, the second port A- is connected to the common node of the first transmission line 10 and the second transmission line 20, and the third port A+ is connected to the second transmission line 20 and the third transmission line 30 at the common node; the first port A+ and the second port A- form a first differential port, the third port A+ and the fourth port B- form a second differential port; the second The first transmission line 10 , the second transmission line 20 and the thi...
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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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IPC IPC(8): H01P1/203H01P1/16
CPCH01P1/16H01P1/203
Inventor 施金强俊曹青华张威秦伟陈建新唐慧
Owner 南通博士汇创新技术转移有限公司