430 GHz bandpass filter incorporating synthetic transmission lines in standard 0.13 μm CMOS

A third-order transmission line (TL) based terahertz bandpass filter (BPF) is presented in this paper. All the resonators are implemented by using the synthetic transmission lines, so-called the complementary-conducting strip transmission line (CCS-TL). The guiding characteristics of the CCS-TL with different size of the periods are theoretically extracted for the filter design. The comparisons between simulated and measured results show that the prototype in 0.13 μm 1P8M CMOS technology has an insertion-loss of 2.4 dB and a fractional bandwidth of 26%, with a 3.5% offset of the center frequency.