Band-pass filter having three or more loop-shaped electrodes

A band-pass filter comprising:

• at least three first electrodes formed in a loop shape and disposed so as to be magnetically coupled with each other;
• a pair of second electrodes each formed in a plane shape and opposite said first electrodes, a pair of respective plates each defining a plurality of edges including two ends and comprising a dielectric material being disposed between said first electrodes and each of said second electrodes;
• a respective first earth terminal being drawn out from each of said first electrodes toward a selected edge defined by said plates;
• a pair of input/output terminals being drawn out from each of said first electrodes toward a selected edge defined by said plates;
• a pair of input/output terminals being drawn out respectively from a pair of said first electrodes which are disposed toward said ends of said plates, each said input/output terminal being formed at a distance from the corresponding earth terminal of the respective first electrode so as to provide a predetermined impedance with respect to said earth terminal;
• and
• at least one second earth terminal being drawn out respectively from each of said second electrodes toward said selected edge defined by said plates.

A band-pass filter comprising:

• at least three first electrodes formed in a loop shape and disposed so as to be magnetically coupled with each other;
• a second electrode formed in a plane shape and opposed to said first electrodes, with a plate comprising a dielectric material being disposed between said first electrodes and said second electrode, said plate having two ends and a periphery;
• a respective first earth terminal being drawn out from each of said first electrodes toward said periphery of said plate;
• a pair of input/output terminals being drawn out toward said periphery from a pair of said first electrodes, said pair of first electrodes being disposed toward said ends of said plate;
• each said input/output terminal being formed at a distance around said periphery from the corresponding earth terminal of the respective first electrode so as to provide a predetermined impedance with respect to said earth terminal;
• and
• at least one second earth terminal being drawn out from said second electrode toward said periphery of said plate.

A band-pass filter comprising:

• at least three first electrodes formed in a loop shape and disposed so as to be magnetically coupled with each other;
• a pair of second electrodes each formed in a plane shape and opposite said first electrodes, a pair of respective plates each defining a periphery which includes two ends and comprising a dielectric material being disposed between said first electrodes and each of said second electrodes;
• a respective first earth terminal being drawn out from each of said first electrodes toward said periphery defined by said plates;
• a pair of input/output terminals being drawn out toward said periphery from a pair of said first electrodes which are disposed toward said ends of said plates;
• each said take-out terminal being formed at a distance around said periphery from the corresponding earth terminal of the respective first electrode so as to provide a predetermined impedance with respect to said earth terminal;
• and
• at least one second earth terminal being drawn out respectively from each of said second electrodes toward said periphery defined by said plates.