Frequency Tunable Non-Reciprocal Bandpass Filter Using Time-Modulated Microstrip λ g /2 Resonators

Autor: Juan Sebastian Gomez-Diaz, Xiaoguang Liu, Mahmoud Nafe, Alejandro Álvarez Melcón, Xiaohu Wu

Publikováno v: IEEE Transactions on Circuits and Systems II: Express Briefs. 68:667-671

This brief presents a novel frequency reconfigurable microstrip non-reciprocal bandpass filter based on time-modulated microstrip $\lambda _{g}/2$ resonators. The modulation is achieved by loading both ends of the $\lambda _{g}/2$ transmission line r

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bddb7c688db22175558d905c3230bb50
https://doi.org/10.1109/tcsii.2020.3014499

A Magnetless Microstrip Filtering Circulator based on Coupled Static and Time-Modulated Resonators

Autor: Xiaohu Wu, Mahmoud Nafe, Xiaoguang Liu

Publikováno v: 2020 IEEE/MTT-S International Microwave Symposium (IMS).

This paper reports for the first time a magnetless microstrip circulator with a filtering response. By coupling static resonators to spatio-temporally modulated resonators, two isolation poles and two reflection poles can be obtained within the passb

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c2cfb782e2b26d9c1e95e483fda60bc2
https://doi.org/10.1109/ims30576.2020.9223831

Gain-Enhanced On-Chip Folded Dipole Antenna Utilizing Artificial Magnetic Conductor at 94 GHz

Autor: Mahmoud Nafe, Ahad Syed, Atif Shamim

Publikováno v: IEEE Antennas and Wireless Propagation Letters. 16:2844-2847

On-chip antennas suffer from low gain values and distorted radiation patterns due to the lossy and high permittivity Si substrate. An ideal solution would be to isolate the lossy Si substrate from the antenna through a perfect electric conductor grou

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fe69dabd5282154f7d0fbc42b8176c31
https://doi.org/10.1109/lawp.2017.2749308

A Wideband Magnetic-Free Circulator Using Spatio-Temporal Modulation of 2-pole Bandpass Filters

Autor: Xiaoguang Liu, Xiaohu Wu, Mahmoud Nafe

Publikováno v: RWS

Spatio-temporal modulation (STM) has been recently introduced to efficiently implement angular momentum biasing, which is a biasing technique that breaks the time reversal symmetry yielding a non-reciprocal response. In literature, several circulator

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::be7d034896e082f13c6d7e22691e3c70
https://doi.org/10.1109/rws.2019.8714548

Design of all passive blocker-tolerant reconfigurable RF front-end filter

Autor: Xiaoguang Leo Liu, M. Naimul Hasan, Mahmoud Nafe

Publikováno v: Naimul Hasan, M; Nafe, M; & Liu, XL. (2017). Design of all passive blocker-Tolerant reconfigurable RF front-end filter. 2017 IEEE 18th Wireless and Microwave Technology Conference, WAMICON 2017. doi: 10.1109/WAMICON.2017.7930272. UC Davis: Retrieved from: http://www.escholarship.org/uc/item/2w93b97k

© 2017 IEEE. This paper presents a tunable active bandpass filter with adjustable notch close to the passband for blocker rejection. The proposed filter is based on two-path signal cancellation and consists of a top-C coupled tunable bandpass filter

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a0be24806f0cf487de95b87eb4908e5d
https://doi.org/10.1109/wamicon.2017.7930272