Microwave power dividers and combiners having an adjustable terminating resistor

Microwave apparatus comprising:

• a first port coupled to a first impedance path having an impedance value Zc, that splits along two paths each having a nominal length of .lambda./4 and a nominal impedance value of 2(Zc);
• second and third impedance paths, each having an impedance value Zc, respectively coupled to the two paths;
• second and third ports coupled to the second and third impedance paths, respectively;
• a central contact disposed at a midpoint between respective inner edges of the second and third impedance paths;
• and
• an adjustable terminating resistor overlying the respective inner edges of the second and third impedance paths and the central contact that comprises first and second resistor sections disposed on either side of the central contact;
• and wherein outer edges of the central contact are substantially parallel to the inner edges of the second and third impedance paths over which the terminating resistor lies so that each section of the resistor has substantially the same resistance value.