A Miniaturized Impedance Transformer on PES for Flexible RFICs

作者：Yun Young^*; Jeong Jang Hyeon; Kim Hong Seung; Jang Nak Won

来源：Microwave Journal, 2014, 57(2): 100-+.

A transmission line employing a periodic structure was fabricated on a polyether sulfone (PES) substrate and its RF characteristics were investigated. A fishbone-type transmission line, employing a comb-type ground plane (FTLCGP) structure, was designed to reduce the wavelength. The FTLCGP structure on PES substrate showed a wavelength much shorter than for a conventional coplanar waveguide on PES. The FTLCGP structure on the PES substrate showed an attenuation constant a lower than 0.2 Np/mm, up to 40 GHz, which was much lower than for a transmission line on a commercial silicon substrate. Using the FTLCGP structure, a miniaturized impedance transformer was fabricated on a PES substrate for flexible RFIC applications. The size of the impedance transformer was 0.45 mm(2), which was 57.5 percent of the size of the transformer fabricated by conventional coplanar wave guide on PES substrate. The return and insertion losses were 43 and 0.74 dB, respectively, at a center frequency of 22 GHz and the return loss values were better than 10 dB and the insertion loss was better than 1.1 dB up to 46.4 GHz.

• 出版日期2014-2