TY - GEN
T1 - Negative group delay enabled artificial transmission line exhibiting squint-free, dominant mode, backward leaky-wave radiation
AU - Zhu, Minning
AU - Michael Wu, Chung Tse
N1 - Funding Information:
ACKNOWLEDGMENT This work is sponsored by the Defense Advanced Research Projects Agency under Grant D19AP00030. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the position or the policy of the Government.
Publisher Copyright:
© 2020 IEEE.
PY - 2020/8
Y1 - 2020/8
N2 - A dispersion-engineered artificial transmission line (TL) enabled by negative group delay (NGD) is proposed to exhibit squint-free dominant mode leaky-wave radiation. The unit cell of the proposed artificial TL is based on a multi-section directional coupler, which is used to generate the desired NGD, followed by a composite right/left-handed transmission line (CRLH-TL) structure. An amplifier is incorporated within each unit cell to compensate for the power loss from the NGD coupler. By incorporating the NGD response, the resulting artificial TL can demonstrate a dispersionless fast wave characteristic within the NGD frequency band. For proof-of-concept, prototypes of a single unit cell and a three-unit cell NGD artificial TL are fabricated and tested to verify the dispersion and radiation characteristics. The measured radiation patterns of the proposed NGD artificial TL indicate that the main beam angle is located at -35 degrees in the backward direction, with a squint-free bandwidth from 2.55 GHz to 2.75 GHz.
AB - A dispersion-engineered artificial transmission line (TL) enabled by negative group delay (NGD) is proposed to exhibit squint-free dominant mode leaky-wave radiation. The unit cell of the proposed artificial TL is based on a multi-section directional coupler, which is used to generate the desired NGD, followed by a composite right/left-handed transmission line (CRLH-TL) structure. An amplifier is incorporated within each unit cell to compensate for the power loss from the NGD coupler. By incorporating the NGD response, the resulting artificial TL can demonstrate a dispersionless fast wave characteristic within the NGD frequency band. For proof-of-concept, prototypes of a single unit cell and a three-unit cell NGD artificial TL are fabricated and tested to verify the dispersion and radiation characteristics. The measured radiation patterns of the proposed NGD artificial TL indicate that the main beam angle is located at -35 degrees in the backward direction, with a squint-free bandwidth from 2.55 GHz to 2.75 GHz.
KW - Artificial transmission line
KW - Composite right/left-handed (CRLH)
KW - Leaky-wave antenna (L W A)
KW - Negative group delay (NGD)
KW - Squint-free radiation
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U2 - 10.1109/IMS30576.2020.9223939
DO - 10.1109/IMS30576.2020.9223939
M3 - Conference contribution
AN - SCOPUS:85094211541
T3 - IEEE MTT-S International Microwave Symposium Digest
SP - 309
EP - 312
BT - IMS 2020 - 2020 IEEE/MTT-S International Microwave Symposium
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2020 IEEE/MTT-S International Microwave Symposium, IMS 2020
Y2 - 4 August 2020 through 6 August 2020
ER -