Nonreciprocal circuit device and telecommunications apparatus including the same

Abstract

Provided is a non-reversible circuit element capable of preventing an increase in insertion loss as a non-reversible circuit element and miniaturizing the element as a whole, by applying a stable bias magnetic field to a magnetic substance. A nonreciprocal circuit device includes a box-like yoke consisting of upper and lower yokes. The yoke accommodates a magnetic assembly consisting of a magnetic body and first to third line conductors, chip capacitors connected to ends of the line conductors, and a magnet. The first and second line conductors are input and output terminals, and an end of the third line conductor is connected to a terminating chip resistor. The chip resistor is longitudinally disposed such that its long sides are substantially perpendicular to a line between ends of the input and output terminals. The end of the third line conductor is connected to a terminal electrode on the hot side of the terminating chip resistor. A terminal electrode on the earth side of the terminating chip resistor is directly connected to the lower yoke, and a notch is formed in the lower yoke under the hot side terminal electrode.

Description

[0001] technology area [0002] The present invention relates to nonreciprocal circuit elements such as isolators used in communication devices such as mobile phones. Background technique [0003] Figure 8 It is an exploded perspective view showing the structure of a conventional general isolator (non-reciprocal circuit element). [0004] Figure 8 In the shown isolator 200, a disc-shaped permanent magnet 203, a magnetic assembly 205, and three matching chip capacitors C1 are sandwiched between a box-shaped upper yoke (上ヨ一ク) 202 and a lower yoke 208. , C2, C3 and a resin box 207 with a terminal chip resistor R. (Refer to Patent Documents 1 and 2) [0005] The structure adopted by the magnetic assembly 205 is that a ferrite 254 is placed at the connecting portion of the central conductor having the same shape as the bottom surface of the disk-shaped ferrite 254, and the three central conductors 251 extended from the connecting portion, 252 and 253 are bent and wound at pred...

AI Technical Summary

Problems solved by technology

[0016] In addition, when a resin film is formed on the lower yoke 208 below the terminal electrode of the working end of the chip resistor R, since the lower yoke 208 is generally subjected to silver plating or solder plating, the plating film formed on this plated film may occur. The problem that the resin film on the top is easy to fall off

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