US 12,309,914 B2
Multilayer circuit board having signal and power isolation circuit
Tarou Higuchi, Nagaokakyo (JP); Yoshihiro Imanishi, Nagaokakyo (JP); Yasushi Saito, Nagaokakyo (JP); Akio Igarashi, Nagaokakyo (JP); Minehito Yoshida, Nagaokakyo (JP); Hiroyuki Honda, Nagaokakyo (JP); Masaki Inui, Nagaokakyo (JP); and Yuya Nagaoka, Nagaokakyo (JP)
Assigned to Murata Manufacturing Co., Ltd., Kyoto-fu (JP)
Filed by Murata Manufacturing Co., Ltd., Kyoto-fu (JP)
Filed on May 2, 2023, as Appl. No. 18/311,130.
Application 18/311,130 is a continuation of application No. PCT/JP2021/037463, filed on Oct. 8, 2021.
Claims priority of application No. 2020-184488 (JP), filed on Nov. 4, 2020.
Prior Publication US 2023/0276567 A1, Aug. 31, 2023
Int. Cl. H05K 1/02 (2006.01); H05K 1/18 (2006.01)
CPC H05K 1/0218 (2013.01) [H05K 1/181 (2013.01); H05K 2201/1003 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A multilayer circuit board having a signal and power isolation circuit, comprising:
a microstrip line on a component mounting surface;
a mounting pad on the microstrip line and having a wider width than a line width of the microstrip line;
at least one chip inductor mounted on the component mounting surface and electrically connected between the mounting pad and a power supply;
an inductor characteristic compensation portion having a predetermined area in a mounting-surface-below portion of an inner-layer ground disposed immediately below the component mounting surface, the mounting-surface-below portion of the inner-layer ground being situated immediately below the chip inductor; and
a signal transmission characteristic compensation portion having a predetermined area in a portion of the inner-layer ground, the portion of the inner-layer ground being situated immediately below the mounting pad, at a position separated from the inductor characteristic compensation portion by a predetermined distance such that the signal transmission characteristic compensation portion is electrically isolated from the inductor characteristic compensation portion.