Title :
Ultra broadband transmission line transformers - planar realization principles
Author :
Horn, Johannes ; Bock, Georg
Author_Institution :
Technische Univ. Berlin, Germany
Abstract :
Three Guanella-type transmission line transformers (TLT) are presented: a coiled TLT on a GaAs substrate, a straight ferriteless TLT on a multilayer PCB and a straight hybrid TLT that employs semi-rigid coaxial cables and a ferrite. All three devices have 4:1 impedance transformation ratio, matching 12.5 Ω to 50 Ω. Extremely broadband operation is achieved. A detailed description of the devices and their operational principle is given. General aspects of the design of TLT are discussed.
Keywords :
coaxial cables; ferrites; gallium arsenide; high-frequency transformers; high-frequency transmission lines; printed circuits; 12.5 ohm; 50 ohm; GaAs; GaAs substrate; Guanella-type TLT; coiled TLT; ferrite; multilayer PCB; planar realization; semi-rigid coaxial cables; straight ferriteless TLT; straight hybrid TLT; ultra broadband transmission line transformers; Coaxial components; Coils; Distributed parameter circuits; Ferrites; Frequency; Impedance; Planar transmission lines; Transformers; Transmission line theory; Wounds;
Conference_Titel :
Microwaves, Radar and Wireless Communications, 2004. MIKON-2004. 15th International Conference on
Print_ISBN :
83-906662-7-8
DOI :
10.1109/MIKON.2004.1356903
