A concept f o r approximating curved antenna surfaces using f l a t facets is discussed. A preliminary design technique f o r determining t h e s i z e of t h e r e f l e c t o r surface facets necessary t o meet antenna surface accuracy requirements i s presented. A proposed l a r g e Microwave Radiometer S a t e l l i t e is selected as an application, and t h e far-field electromagnetic response of a faceted r e f l e c t o r surface is compared with t h a t from a spherical r e f l e c t o r surface.

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This paper presents a fully-integrated 210 GHz transceiver (TRX) with non-coherent on-off-keying (OOK) modulation for short-range multi-Gb/s wireless chip-to-chip communication in 40 nm CMOS technology. The direct detection-based receiver (RX) part comprises an on-die 0.1 dBi gain modified dipole antenna, an 8-stage 210-GHz 21.7-dB peak gain low noise amplifier (LNA) along with differential-pair neutralization technique and a 2.83-kV/W peak responsivity simple demodulator (push detector) in order to operate efficiently in THz regime. The phased-locked transmitter (TX) consists of a 210 GHz 1.3 dBm output power 3.8% locking-range phased-locked loop (PLL), two modified cascode transistors as a simple OOK modulator, a 4-stage 210-GHz 19.4-dB peak power gain power amplifier (PA) with neutralization and especially layout enhancement techniques and a similar modified on-die dipole antenna. The implemented PLL employs a triple-push circular-geometry voltage-controlled oscillator (VCO) followed by a divider chain 1024 . The proposed TRX achieved error-free operation 10 with 6.8 dBm of EIRP at center frequency of 210 GHz with 2 -PRBS of 10.7 Gb/s datarate over 1 cm distance while consuming 421 mW of DC power which results to energy efficiency of 39.3 pJ/bit. Index Terms-CMOS, on-chip antenna, on-off keying (OOK), phase-locked loop (PLL), receiver (RX), RFIC, THzIC, terahertz (THz) transceiver, transmitter (TX), voltage-controlled oscillator (VCO), 200 GHz.