HIGH-FREQUENCY FILTER

• Main Authors: OHASHI HIDEMASA, YONEDA SATOSHI, YUNOGAMI NORIHIRO, OWADA SATORU
• Format: Patent
• Language: English
• Published: 21.09.2006
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE; WAVEGUIDES

PROBLEM TO BE SOLVED: To obtain a high-frequency filter having a passband of low loss, in which conductor gap is eliminated from a process where an input wave from the input end reaches the output end, and damages to a substrate is prevented, even in the case of a high energy input wave. SOLUTION: A plurality of odd number of parallel capacitance circuits, having an open stub and exhibiting a predetermined parallel capacitance at a predetermined cut-off frequency, and a plurality of odd number of series inductance circuits, exhibiting a predetermined series inductance at the predetermined cut-off frequency are cascaded alternately from the input end toward the output end, in the order of the series inductance circuit and the parallel capacitance circuit. The passband is set in the vicinity of the predetermined cut-off frequency, and bandpass characteristics as the attenuation poles are formed at a plurality of frequencies determined, based on the plurality of parallel capacitance circuits, in a frequency region other than the vicinity of the cut-off frequency are attained. COPYRIGHT: (C)2006,JPO&NCIPI