LC high-pass filter circuit device, laminated LC high-pass filter device, multiplexer, and radio communication apparatus

A laminated LC high-pass filter device, comprising:

• a laminated structure including a stack of a plurality of insulating layers, a plurality of capacitive conductors, and a plurality of coiled conductors;
• an input terminal, an output terminal, and a grounding terminal provided on surfaces of said laminated structure;
• a plurality of high-pass filter circuits disposed in said laminated structure, each of said high-pass filter circuits having a first capacitor defined by one of said capacitive conductors and a first inductor defined by one of said coiled conductors;
• and
• a trap disposed in said laminated structure and having a series connection of a second capacitor and a second inductor, said second capacitor being defined by one of said capacitive conductors and said second inductor being defined by one of said coiled conductors;
• wherein said first capacitors of said high-pass filter circuits are connected in series between said input terminal and said output terminal, and said first inductors of said high-pass filter circuits are connected to said input terminal and said output terminal in parallel to each other and are connected also to said grounding terminal;
• and
• wherein said trap is connected between two adjacent high-pass filter circuits so as to shunt from said input terminal and said output terminal, said series connection of said second capacitor and said second inductor being connected to said grounding terminal.