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1. Input-Reflectionless Out-of-Phase 3-dB Bandpass Filtering Couplers

   Gomez-Garcia, Roberto; Munoz-Ferreras, Jose-Maria; Psychogiou, Dimitra (May 2019, 2019 IEEE Radio and Wireless Symposium (RWS))

   A class of out-of-phase 3-dB bandpass-filtering couplers with input-reflectionless capabilities is presented. To obtain the bandpass-filter (BPF) functionality, identical BPF sections are respectively co-integrated in the coupler signal paths from the input to the direct and coupled ports. Furthermore, a resistivelyterminated bandstop-filter (BSF) section with complementary transfer function with regard to the one of the BPF section is loaded at the coupler input access. In this manner, the RF inputsignal energy that is not transmitted to the direct and coupled terminals is dissipated by the loading resistor of the BSF section. Hence, the input-reflectionless behavior is realized. Optimizationbased first-to-third-order design examples are shown. Moreover, for practical-validation purposes of this RF tri-functional device, a 2-GHz second-order microstrip prototype is built and tested. 

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2. A <5 dB NF, > 17 dBm OP _{1 dB} F-Band GaN-on-SiC HEMT LNA with a Monolithic Substrate-Integrated Waveguide Filter

   https://doi.org/10.1109/IMS40175.2024.10600353  

   Thome, Fabian; Schwantuschke, Dirk; Brückner, Peter; Wang, Xiaopeng; Hwang, James_C M; Quay, Rüdiger (June 2024, IEEE)

   This paper demonstrates the monolithic integration of a substrate-integrated waveguide bandpass filter (BPF) and a low-noise amplifier (LNA) at F-band, fabricated in a 70-nm GaN-on-SiC technology. The three-stage LNA alone achieves a state-of-the-art average noise figure of 3.6 dB over 87–115 GHz. The LNA + BPF exhibits a peak gain of 13.6 dB over a 3 dB bandwidth of 17 GHz from 104 to 121 GHz. The average noise figure is 4.9 dB over 87–115 GHz. The OP1 dB and saturated output power are 17.6dBm and >20 dBm, respectively. 

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3. Heterogeneous balanced photodetector on silicon nitride with 30 GHz bandwidth and 26 dB common mode rejection ratio

   https://doi.org/10.1364/OFC.2023.W2B.2  

   Gao, Junyi; Tzu, Ta Ching; Fatema, Tasneem; Guo, Xiangwen; Yu, Qianhuan; Navickaite, Gabriele; Zervas, Michael; Geiselmann, Michael; Beling, Andreas (January 2023, 2023 Optical Fiber Communications Conference and Exhibition (OFC))

   We demonstrate InGaAs/InP balanced photodiodes onSi₃N₄waveguides with record-high 3-dB bandwidth of 30 GHz, 0.72 A/W responsivity, and high common mode rejection ratio (CMRR) of 26 dB at 30 GHz. 

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4. ipso -Arylative polymerization as a route to π-conjugated polymers: synthesis of poly(3-hexylthiophene)

   https://doi.org/10.1039/C8PY00605A  

   Shih, Feng-Yang; Tian, Sisi; Gallagher, Nicholas; Park, Young S.; Grubbs, Robert B. (January 2018, Polymer Chemistry)

   ipso -Arylative cross-coupling with two 3-hexylthiophene derivatives, (5-bromo-4-hexylthiophen-2-yl)diphenylmethanol and 2-(5-bromo-4-hexylthiophen-2-yl)propan-2-ol, has been used to prepare poly(3-hexylhiophene) (P3HT) as a model conjugated polymer. P3HT with number-average molecular weights ranging from 8–20 kg mol −1 ( Đ 1.4–2.2) was prepared from 5-bromo-4-hexylthiophen-2-yl)diphenylmethanol with a Pd(OAc) 2 /PCy 3 /Cs 2 CO 3 catalyst system. Only oligomerization of 2-(5-bromo-4-hexylthiophen-2-yl)propan-2-ol ( M n ≈ 3 kg mol −1 ) was observed under similar conditions. Studies with model compounds suggest that side reactions involving end-group loss limit ultimate molecular weights. 

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5. An LPTV Noise Cancellation Technique for a 0.9-V Filtering-by-Aliasing Receiver Front-End with >67-dB Stopband Rejection

   https://doi.org/10.1109/CICC.2019.8780315  

   Bu, Shi; Hameed, Sameed; Pamarti, Sudhakar (April 2019, 2019 IEEE Custom Integrated Circuits Conference)

   A linear periodically time-varying (LPTV) noise cancellation technique for filtering-by-aliasing (FA) receivers is presented in this paper. Fabricated in a 28-nm CMOS process, it improves the noise Figure (NF) by about 3 dB while achieving over 67-dB stopband rejection with a transition bandwidth of only four times the RF BW. A minimum in-band NF of 3.2 dB is demonstrated. With an upfront -path filter to further enhance the linearity, the measured out-of-band IIP 3 is + 18 dBm and the blocker 1-dB compression point is + 9 dBm. Operating under a 0.9V supply, it consumes 61-mW power at 500-MHz LO. 

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