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This paper presents a transmitter (TX) and a receiver (RX) with a cross-polarized bowtie-antenna on a silicon lens for gas spectroscopy at 222–270 GHz and the doubled frequency at 444–540 GHz. TX and RX are fabricated in 0.13 μm SiGe BiCMOS technology. Both use two integrated local oscillators for frequency subbands 222–256 GHz and 250–270 GHz, which allow operating in one branch of the TX and RX at 222–270 GHz and in a second branch of the TX and RX at 444–540 GHz by frequency doubling. The directivity of the cross-polarized bowtie-antenna of the TX and RX is optimized for these two frequency bands with an estimated value of 24.4 dBi at 260 GHz, and 29.5 dBi at 520 GHz. Absorption spectroscopy of gaseous methanol is used as a measure for the performance of the TX and RX in the lower and upper frequency bands.

This 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 $0.13~\mu \text{m}$ 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.