CC BY 4.0 UnportedSchmalz, KlausRothbart, NickGluck, AlexandraEissa, Mohamed HusseinMausolf, ThomasTurkmen, EsrefYilmaz, Selahattin BerkHubers, Heinz-Wilhelm2022-03-032022-03-032021https://oa.tib.eu/renate/handle/123456789/8120https://doi.org/10.34657/7160This paper presents a transmitter (TX) and a receiver (RX) with bowtie-antenna and silicon lens for gas spectroscopy at 222-270 GHz, which are fabricated in IHP's 0.13 μm SiGe BiCMOS technology. The TX and RX use two integrated local oscillators for 222 - 256 GHz and 250 - 270 GHz, which are switched for dual-band operation. Due to its directivity of about 27 dBi, the single integrated bowtie-antenna with silicon lens enables an EIRP of about 25 dBm for the TX, and therefore a considerably higher EIRP for the 2-band TX compared to previously reported systems. The double sideband noise temperature of the RX is 20,000 K (18.5 dB noise figure) as measured by the Y-factor method. Absorption spectroscopy of gaseous methanol is used as a measure for the performance of the gas spectroscopy system with TX- and RX-modules.enghttps://creativecommons.org/licenses/by/4.0/004621.3bowtie antennaGas spectroscopymm-wavereceiverSiGetransmitterArticle