Terahertz Communication Systems and Amplifier Technologies
Summary
The terahertz region of the electromagnetic spectrum, encompassing roughly 100 GHz to 10 THz, offers vast contiguous bandwidth to support multi-gigabit wireless links, high-resolution imaging and spectroscopy. Terahertz communication systems aim to exploit this spectrum for beyond-5G and future 6G networks, enabling ultra-high-speed backhaul, indoor connectivity and secure short-range links. Key challenges include severe free-space attenuation, atmospheric absorption peaks and tight beam-alignment requirements. Addressing these demands has driven innovations in front-end electronics: low-noise amplifiers and power amplifiers with cut-off frequencies exceeding 500 GHz, compact local-oscillator sources, on-chip antennas and low-loss matching networks. Semiconductor platforms range from silicon CMOS and BiCMOS for high-volume applications to III-V technologies such as indium phosphide and metamorphic high-electron-mobility transistors for maximum performance. Outphasing, harmonic-generation and beam-combining techniques have further boosted output power and efficiency in miniature modules. Advances in packaging, thermal management and three-dimensional integration have reduced insertion losses and improved thermal stability. Together, these developments are laying the groundwork for energy-efficient, fully integrated terahertz transceivers, poised to transform wireless capacity, sensing precision and security in applications spanning consumer electronics, industrial inspection and biomedical diagnostics.
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Terahertz Communication Systems and Amplifier Technologies publication trend
The graph below shows the total number of articles in terahertz communication systems and amplifier technologies across all publications each year (not limited to Nature Index journals).
Technical terms
Terahertz frequency: electromagnetic spectrum between 100 GHz and 10 THz offering wide bandwidth for communications and sensing.
Power amplifier (PA): device that boosts signal power to overcome high path loss at terahertz frequencies, characterised by gain, output power and efficiency.
Noise figure (NF): metric expressing the degradation of signal-to-noise ratio introduced by an amplifier or receiver.
Monolithic microwave integrated circuit (MMIC): semiconductor chip integrating active and passive microwave components for compact high-frequency modules.
BiCMOS technology: semiconductor process combining bipolar transistors and CMOS on a single die for balanced speed, gain and integration.
Metamorphic high-electron-mobility transistor (mHEMT): III-V device offering high cut-off frequency and low noise for terahertz amplifiers.
References
- A Bi-Directional 300-GHz-Band Phased-Array Transceiver in 65-nm CMOS With Outphasing Transmitting Mode and LO Emission Cancellation. IEEE Journal of Solid-State Circuits (2022).
- Broadband 300-GHz Power Amplifier MMICs in InGaAs mHEMT Technology. IEEE Transactions on Terahertz Science and Technology (2020).
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