Shannon Wireless’ Post

My first research on THz Resonant tunneling diodes (RTDs) have been widely adopted to implement communication systems in the terahertz (THz) range. This study presents a package of the RTD for a THz receiver at the WR-2.2 band (330-500 GHz). In this package, the near-unity transmission effective medium waveguide composed of high-resistivity silicon and air is employed. A novel planar antenna integrated with the RTD chip maximizes the coupling efficiency to the silicon waveguide. The simulated bandwidth of the module is 170 GHz. The maximum error-free data rate of the module is 30 Gbit/s for direction connection to a transmitter. We also demonstrated wireless communication of 25 Gbit/s in a distance of 3 cm at 350 GHz.

#Reconfigurable #intelligent #surface (#RIS) is capable of improving the wireless system performance by steering the reflected signal in the desired direction. One of the major challenges is that both the transceiver and RIS have to be jointly optimized, where the #optimization #problems have to be reformulated for different system models and scenarios. To circumvent this challenge, #new #low-#complexity #antenna #selection (#AS) algorithms for #transceiver-#agnostic RIS configuration are proposed. Given a #multiple-#input #multiple-#output (#MIMO) channel, the proposed RIS-AS opts for accurately aligning the RIS both with the #transmit #antenna (#TA) and #receive #antenna (#RA) for the sake of maximizing the MIMO channel’s overall output power. The proposed RIS-AS only has to configure the RIS alone, i.e. without iterations with the transceiver optimization. ----@Chao Xu, Jiancheng An, @Tong Bai, @Shinya Sugiura, @Robert G. Maunder, Lie-Liang Yang, @Marco Di Renzo, Lajos Hanzo More details can be found at this link: https://lnkd.in/gpG7jnK3

#Reconfigurable #intelligent #surface (#RIS) is capable of improving the wireless system performance by steering the reflected signal in the desired direction. One of the major challenges is that both the transceiver and RIS have to be jointly optimized, where the #optimization #problems have to be reformulated for different system models and scenarios. To circumvent this challenge, #new #low-#complexity #antenna #selection (#AS) algorithms for #transceiver-#agnostic RIS configuration are proposed. Given a #multiple-#input #multiple-#output (#MIMO) channel, the proposed RIS-AS opts for accurately aligning the RIS both with the #transmit #antenna (#TA) and #receive #antenna (#RA) for the sake of maximizing the MIMO channel’s overall output power. The proposed RIS-AS only has to configure the RIS alone, i.e. without iterations with the transceiver optimization. ----@Chao Xu, Jiancheng An, @Tong Bai, @Shinya Sugiura, @Robert G. Maunder, Lie-Liang Yang, @Marco Di Renzo, Lajos Hanzo More details can be found at this link: https://lnkd.in/dPcYFkxf

#Reconfigurable #intelligent #surface (#RIS) is capable of improving the wireless system performance by steering the reflected signal in the desired direction. One of the major challenges is that both the transceiver and RIS have to be jointly optimized, where the optimization problems have to be reformulated for different system models and scenarios. To circumvent this challenge, new low-complexity #antenna #selection (#AS) algorithms for transceiver-agnostic RIS configuration are proposed. Given a #multiple-#input #multiple-#output (#MIMO) channel, the proposed RIS-AS opts for accurately aligning the RIS both with the #transmit #antenna (#TA) and #receive #antenna (#RA) for the sake of maximizing the MIMO channel’s overall output power. The proposed RIS-AS only has to configure the RIS alone, i.e. without iterations with the transceiver optimization. As a result, the proposed RIS-AS has the compelling benefit that they are generically applicable, regardless of the specific transceiver architecture. ---- Chao Xu, Jiancheng An, Tong Bai, Shinya Sugiura, Prof Rob Maunder, Lie-Liang Yang, Marco Di Renzo, Lajos Hanzo More details can be found at this link: https://lnkd.in/e5Keij8z

#Reconfigurable #intelligent #surface (#RIS) is capable of improving the wireless system performance by steering the reflected signal in the desired direction. One of the major challenges is that both the transceiver and RIS have to be jointly optimized, where the optimization problems have to be reformulated for different system models and scenarios. To circumvent this challenge, new low-complexity #antenna #selection (#AS) algorithms for transceiver-agnostic RIS configuration are proposed. Given a multiple-input multiple-output (#MIMO) channel, the proposed RIS-AS opts for accurately aligning the RIS both with the transmit antenna (TA) and receive antenna (RA) for the sake of maximizing the MIMO channel’s overall output power. The proposed RIS-AS only has to configure the RIS alone, i.e. without iterations with the transceiver optimization. ---- Chao Xu, Jiancheng An, Tong Bai, Shinya Sugiura Prof Rob Maunder, Lie-Liang Yang, Marco Di Renzo, Lajos Hanzo More details can be found at this link: https://lnkd.in/e5Keij8z

I am pleased to share the recent publication of two new articles regarding substrate-related parasitic effects in GaN-on-Si stacks for RF applications! 🎉 In "𝐸𝑓𝑓𝑒𝑐𝑡 𝑜𝑓 𝐵𝑢𝑓𝑓𝑒𝑟 𝐶ℎ𝑎𝑟𝑔𝑒 𝑅𝑒𝑑𝑖𝑠𝑡𝑟𝑖𝑏𝑢𝑡𝑖𝑜𝑛 𝑜𝑛 𝑅𝐹 𝑎𝑛𝑑 𝐻𝑎𝑟𝑚𝑜𝑛𝑖𝑐 𝐷𝑖𝑠𝑡𝑜𝑟𝑡𝑖𝑜𝑛 𝑖𝑛 𝐺𝑎𝑁-𝑜𝑛-𝑆𝑖 𝑆𝑢𝑏𝑠𝑡𝑟𝑎𝑡𝑒𝑠" (IEEE Journal of the Electron Devices Society), we take a deep dive into the charge movement processes that take place in the buffer layers of the nitride epitaxial stack. We were able to model them to understand and reproduce the degradation with time of the substrate resistivity and linearity. The second one, titled "𝐶𝑜𝑛𝑡𝑟𝑖𝑏𝑢𝑡𝑖𝑜𝑛 𝑜𝑓 𝑆𝑢𝑏𝑠𝑡𝑟𝑎𝑡𝑒 𝐻𝑎𝑟𝑚𝑜𝑛𝑖𝑐 𝐷𝑖𝑠𝑡𝑜𝑟𝑡𝑖𝑜𝑛 𝑡𝑜 𝐺𝑎𝑁-𝑜𝑛-𝑆𝑖 𝑅𝐹 𝑆𝑤𝑖𝑡𝑐ℎ𝑒𝑠 𝐿𝑖𝑛𝑒𝑎𝑟𝑖𝑡𝑦", was published in IEEE Microwave and Wireless Technology Letters. It discusses the impact of the non-linear GaN-on-Si subtrate on one of the key functional blocks of a RF front-end-module: the RF switch. Our aim is to help answer the question: "what is the requirement on substrate performance to enable highly linear GaN-on-Si RF switches ?" Links : https://lnkd.in/eeBJbYW4 and https://lnkd.in/etmYSGXj

Generating a wideband frequency-modulated signal with high transmitter output power and efficiency is challenging in a silicon-based D-band radar application. Voltage-controlled oscillators used for frequency modulation have a limited frequency tuning range and phase noise above 100 GHz. To address this issue, a frequency multiplier can be placed after an oscillator operating at a moderate frequency. In our recent work published in IEEE Microwave and Wireless Technology Letters, we demonstrated a power-efficient, high-power frequency doubler integrated with a power amplifier for a D-band FMCW imaging radar transmitter. The proposed frequency doubler exhibits a fully differential output by extracting the second-order harmonic from both the shared source and drain nodes of a push-push differential pair and amplifying it through a CG amplifier. The power amplifier exploits ADNFETs, a novel device developed by GlobalFoundries, for high output power and efficiency. The proposed transmitter achieves a saturation output power greater than 10 dBm and a drain efficiency higher than 12% from 114 to 126 GHz. #ieee #mwtl #mmwave #dband #frequency_doubler #radiofrequency

This paper put forward the paradigm of #thermal #noise #communication (#TherCom) for future wired/wireless networks with extremely low power consumption. Taking backscatter communication (BackCom) and #reconfigurable #intelligent #surface (#RIS)-based radio frequency chain-free transmitters one step further, a thermal noise-driven transmitter might enable zero-signal-power transmission by simply indexing resistors or other noise sources according to information bits. They aims to shed light on the theoretical foundations, transceiver designs, and error performance derivations as well as optimizations of two emerging TherCom solutions: #Kirchhoff-#law-#Johnson-#noise (#KLJN) secure bit exchange and wireless thermal noise modulation (TherMod) schemes. ---- Ertugrul Basar More details can be found at this link: https://lnkd.in/gtcgEKW8

This paper presents a single-element #linearly #polarized (#LP) patch antenna characterized by a wide impedance bandwidth and low profile, optimized for 5G V2X applications. By inserting air gaps into the LP patch antenna structure, a #circularly #polarized (#CP) antenna is generated. Moreover, a cross-stubs technique is employed to generate CP from LP, thereby enhancing the #axial #ratio (#AR) bandwidth. ---- Khaled A. Alblaihed, Abdoalbaset Ali abohmra, Masood Ur Rehman, Qammer H. Abbasi, CEng, FRSA, FRET, FEAI, FIET, Muhammad Ali Imran, FIEEE, FRSE, FRSA, FIET, FEAI, SFHEA, CEng., Lina Mohjazi More details can be found at this link: https://lnkd.in/ewawqA2A

Focus Microwave’s development of a new Keysight PNA-x-based noise parameters extraction system tailored for on-wafer applications at D-Band marks a significant advancement in millimeter-wave testing capabilities. This cutting-edge solution focuses on enabling precise on-wafer measurements of active circuits operating at millimeter-wave frequencies, particularly in the challenging D-Band spectrum. This innovation holds the promise of enhancing precision and success in noise figure measurements for active circuits in millimeter-wave applications as proven in the joint scientific paper with Keysight : N. Messaoudi et al. "Enhanced Accuracy in On-Wafer Noise Figure Measurements at Sub-Terahertz Frequencies," 2024 IEEE/MTT-S International Microwave Symposium - IMS 2024, Washington, DC, USA, 2024, pp. 1024-1027, doi: 10.1109/IMS40175.2024.10600359 #KeysightSolutionPartner #Dband #SubTHz URL: