Choke Coil Mounting Substrate

Abstract

The present invention provides a choke coil mounting substrate that enables high-density mounting of a plurality of components including a choke coil on a circuit substrate and that suppresses degradation of high-frequency characteristics due to parasitic capacitance. A choke coil assembly substrate (1), which includes a choke coil (10) and a circuit substrate (30) equipped with the choke coil (10). The choke coil (10) has: a main body (11) , a coil-shaped conductor part is embedded; and external electrodes (12, 13) are respectively provided to cover both ends of the main body part (11) in the longitudinal direction and are electrically connected to both ends of the conductor part; wherein, The external electrode (12) is electrically connected to the circuit board (30) with its longitudinal direction perpendicular to the circuit board (30).

Description

technical field [0001] The invention relates to a choke coil assembly substrate, in particular to a choke coil assembly substrate equipped with a bias T choke coil. Background technique [0002] In recent years, the high-speed and high-capacitance of optical communication have accelerated, and the introduction of 100Gbit / s optical communication systems has been active. In addition, it is also vigorously carrying out research and development for the practical application of the next-generation 400Gbps optical communication system. In optical transceivers and high-frequency circuits for measuring instruments used in these optical communication systems, choke coils such as laminated coils are often used as bias T (for example, refer to Patent Document 1). The choke coil has the characteristic of passing direct current and exhibiting high impedance to high frequency alternating current (high frequency). [0003] Such as Figure 8 As shown, the choke coil 40 is mounted on a cir...

AI Technical Summary

Problems solved by technology

[0005] However, in recent years, there has been an increasing demand for miniaturization of high-frequency circuits used in optical communication systems, and there has been a problem that circuits using conventional choke coils placed in a horizontal position cannot adequately meet this demand.

[0006] and, if Figure 9 As shown, the conventional choke coil placed in a horizontal position also has a problem that parasitic capacitance occurs between the ground plane of the circuit board and the resonance caused by the parasitic capacitance, which deteriorates the frequency characteristics of the entire circuit including the choke coil.

Images