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This paper presents a Ruthroff type spiral un-to-un transmission-line transformer (TLT) with impedance transformation ratio of 4∶9. Our TLT is fabricated in Microstrip lines technology and covers a chip area of 1.02 mm × 1.12 mm. The simulated minimum insertion loss is 0.19 dB at 5.4 GHz, and the correspondent bandwidth of this TLT is 5.4 GHz (when the insertion loss exceeds 1 dB).
The goal of this paper is to compare two configurations of Ruthroff un-to-un 1∶4 TLT using coupled microstrip lines. Concentric and interwound Transmission line transformers were simulated by HFSS simulator. The simulated minimum insertion losses of the concentric and interwound TLTs are 0.27 dB at 5.4 GHz and 0.26 dB at 4.5 GHz, respectively. The correspondent bandwidths of these TLTs are 7.22 GHz...
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