This paper presents a new type of a transmission line with the variable characteristic impedance which is electronically tuned by RF switches or varactors. Furthermore, a tunable impedance transformer, which can be used to enhance the impedance matching between an antenna and RF front-end, using this variable ZC transmission line is fabricated and measured. By means of inserting a third metal between signal and ground metal, we can adjust the equivalent capacitance or inductance per unit length, which makes the novel transmission line have different characteristic impedances. The impedance transformer can be electronically varied from 10 to 65 O in a 50 O environment at the center frequency of 900 MHz.
|Title of host publication||35th European Microwave Conference 2005 - Conference Proceedings|
|Number of pages||4|
|Publication status||Published - 2005|
|Event||GAAS 2005 - 13th European Gallium Arsenide and Other Compound Semiconductors Application Symposium - Paris, France|
Duration: 3 Oct 2005 → 4 Oct 2005
|Conference||GAAS 2005 - 13th European Gallium Arsenide and Other Compound Semiconductors Application Symposium|
|Period||3/10/05 → 4/10/05|