Splitter/combiner circuit

A circuit for circuit for combining/splitting first RF signal having a wavelength of x, and a second RF signal having a wavelength of y, said circuit comprising:

• a substrate;
• first and second transmission lines intersecting on said substrate
• first, second and third ports on said substrate, said first port disposed at one end of said first transmission line, said second port being disposed at the intersection of said first and second transmission lines, said third port being disposed at the end of said second transmission line;
• first and second stub transmission lines on said substrate, each having a free end and a connected end, said connected end of said first stub transmission line being connected to said first transmission line proximate said first port, said connected end of said second stub transmission line being connected to said second transmission line proximate to said third port;
• and
• wherein said first transmission line and said first stub transmission line having a length which is an odd multiple of about ¼ y±<⅛ y, said second stub transmission line having a length which is an odd multiple of ¼ x±<⅛ x, wherein x and y differ by a multiple of ½ x±⅛x.

A method of combining/splitting a first RF signal having a wavelength of x, and a second RF signal having a wavelength of y using a circuit having first and second transmission portions, and first, second and third ports, said first port located at said first transmission portion, said third port being located at said second transmission portion, and said second port being between said first and second transmission portions, said method comprising:

• introducing a first RF signal having a wavelength of x at one of said first port or said second port;
• transmitting said first RF signal along said first transmission portion, said first transmission portion having a length which is an odd multiple of about ¼ y±<⅛ y, wherein x and y differ by a multiple of ½ x ±⅛x;
• forming a first standing wave of said first RF signal in said second transmission portion, thereby preventing said first RF signal from propagating through said second transmission portion and out of said third port;
• and
• outputting said first RF signal at the other of said first port or said second port.