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Frequency dependent parametric radiation through a nonlinear fundamentally slow travelling wave structure
Author(s) -
Li Shuping,
Zhu Minning,
Yuan Yichao,
Wu ChungTse Michael
Publication year - 2021
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.32950
Subject(s) - parametric statistics , nonlinear system , optics , leaky wave antenna , physics , harmonic , radiation , transmission line , antenna (radio) , harmonics , varicap , beam (structure) , diode , acoustics , engineering , telecommunications , optoelectronics , voltage , mathematics , statistics , microstrip antenna , electrode , quantum mechanics , capacitance
This article presents a nonlinear leaky wave antenna (LWA) with frequency dependent parametric radiation based on a fundamentally slow‐wave transmission line (TL) structure. Unlike a conventional LWA that radiates at the excitation frequency, the radiation for the proposed travelling wave structure relies on the parametric frequencies based on the injected pump signals. The proposed nonlinear fundamentally slow wave structure utilizes a periodic sharply bend TL loaded by varactor diodes as nonlinear elements. By utilizing the n = −1 spatial harmonic, the fundamentally slow wave structure can enter the leaky wave region at higher frequencies, where the parametric radiation results from the bifurcation of the injected pump signals. Such TL‐based nonlinear LWA reduces the design complexity and fabrication difficulty. The resulting parametric frequency radiation can be used for beam steering, which provides additional degree of design freedom.