A multi-band antenna switch circuit including a diplexer connected to an antenna terminal for demultiplexing signals of different passing bands, a first and a second switch circuit for switching a high frequency signal and a low frequency signal demultiplexed by the diplexer to a plurality of transmission/reception terminals, a first and a second low pass filter connected to a transmission path between the diplexer and the transmission terminal or between the first and the second switch circuit and the transmission terminal, and a notch filter provided between the diplexer and the first switch circuit or between the diplexer and the second switch circuit. The multi-band antenna switch circuit includes a high pass filter having an input terminal and an output terminal and provided at least between the diplexer and the antenna terminal and including a first inductor connected between the input terminal and the ground, a first capacitor connected between the input terminal and the output terminal, a second inductor connected to the output terminal, and a second capacitor connected between the second inductor and the ground.

Bypass filter; multi;band antenna switch circuit; and layered module composite part and communication device using them

A fully-synthetic culture medium is prepared on the basis of the in-line measured data about C, N, P and O source in FUS-50(A) multi-parameter full-automatic fermentor and the principle of cell metabolites balance through optimizing pH value, selecting proper buffer system and adding sufficient C, N, P, inorganic salts, vitamines and biological promoter. It can highly express the expogenous protein and can be used for the shaking fermentation of Pasteur-Pichia yeast.

Full-synthetic culture medium and its application

PROBLEM TO BE SOLVED: To provide a high-frequency filter circuit capable of attenuating disturbing signals and making broadcast signals having two different frequency bands pass through.SOLUTION: A high-frequency filter circuit (1) making broadcast signals having two bands of an upper side band and a lower side band pass through to supply the broadcast signals to a subsequent broadcast signal reception circuit, has: an input terminal (11) to which the broadcast signals of the upper side band and the lower side band are inputted; a first filter part connected to the input terminal (11), having a transmission characteristic by which the broadcast signal of the upper side band is passed through, and in which an input impedance of the lower side band is set to a high impedance; and a second filter part connected to the input terminal (11), having the transmission characteristic by which the broadcast signal of the lower side band is passed through, and in which an input impedance of the upper side band is set to the high impedance.

High-frequency filter circuit

PURPOSE:To improve the FM interference ratio by arranging a capacitor in series with a first or second coil and setting the parts constant of this series circuit as an IF frequency to constitute a high-pass filter including an IF trap. CONSTITUTION:A first coil 5 is connected between a low-pass filter 2 and the earth, and a first capacitor 6 is connected to one end of the first coil 5, and a second capacitor 14 is connected to the first capacitor 6, and a second coil 7 is connected in series to the second capacitor 14, and the other end of the second coil 7 is connected to the earth, and they constitute the high-pass filter. The series resonance frequency of the coil 7 and the capacitor 14 is set as the IF frequency of the high-pass filter. Thus, the high-pass filter is operated to have not only an extreme point in the stop band but also an attenuation pole in the IF frequency as a maximum attenuation point.

Kawamura Nobuyuki

Papers

Vhf input filter circuit for electronic tuner