Title :
Quadrature directional couplers using multisection coupled lines
Author :
Jee, Ki Mann ; Kim, Sung Wan ; Park, Dong Chul
Author_Institution :
Dept. of Radio Sci. & Eng., Chung Nam Nat. Univ., Taejon, South Korea
fDate :
2/1/2000 12:00:00 AM
Abstract :
New structure and design methods of directional couplers that can achieve both loose coupling and tight coupling by use of multisection coupled lines are presented. Output voltage formulas at each port are derived from the coupled-line theory. Measured results agree very well with predicted ones. Since the proposed couplers are very small in size and have suitable shape for high-density integrated circuits, they have potential applications in portable terminals for mobile communication systems
Keywords :
circuit tuning; coupled transmission lines; directional couplers; integrated circuit design; microwave integrated circuits; coupled-line theory; high-density integrated circuits; loose coupling; mobile communication systems; multisection coupled lines; output voltage formulas; portable terminals; quadrature directional couplers; tight coupling; Conductors; Coplanar transmission lines; Coupling circuits; Design methodology; Dielectrics; Directional couplers; Impedance; Power transmission lines; Transmission line theory; Voltage;
Journal_Title :
Microwave and Guided Wave Letters, IEEE
