Detector for detecting frequencies in more than one band

A detector for detecting frequencies of more than one band, said detector comprising:

• a first transmission line, a second transmission line, and a third transmission line configured with a strip line;
• said first transmission line disposed between said second and third transmission lines;
• a length of said second transmission line parallel to said first transmission line and a length of said third transmission line parallel to said first transmission line being different;
• one end of said first transmission line being coupled to a terminating resistor, another end of said first transmission line being coupled to an anode terminal of a detecting diode through an end of a wideband matching circuit;
• a cathode terminal of said detecting diode being coupled to a load circuit;
• and
• input terminals and output terminals at each end of said second and said third transmission lines, respectively
• wherein said first, second, and third transmission lines and said input and output terminal at each end of said second and said third transmission lines are formed on a first face of a multilayer circuit board;
• said detecting diode and said wideband matching circuit are formed on a second surface of said multilayer circuit board;
• and thicknesses of said first, second, and third transmission lines are thinner than thickness of at least one of said input and output terminals.