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A metallic 3D printed miniaturized circularly polarized log periodic Koch‐dipole array antenna
Author(s) -
Xiong Yichen,
Zhang Bing
Publication year - 2021
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.22684
Subject(s) - optics , dipole antenna , bandwidth (computing) , materials science , optoelectronics , axial ratio , radiation pattern , turnstile antenna , koch snowflake , circular polarization , physics , coaxial antenna , antenna (radio) , microstrip , electrical engineering , engineering , telecommunications
A miniaturized circularly polarized (CP) log periodic Koch‐dipole array antenna (LPKDA) is proposed. Two pairs of dipoles are orthogonally deployed along the feeding line to generate the CP EM wave. The antenna's size is miniaturized by the T‐shaped top loading and the Koch fractal structure, which also helps to widened the antenna's axial ratio bandwidth. Compared with the conventional LPDA of the same impedance bandwidth, the proposed miniaturized CPLPKDA features 42%‐dimensional reduction. Taking the advantage of 3D printing technology to fabricate complex structures, the proposed CPLPKDA is fabricated by selective laser melting (SLM) using aluminum alloy. Measurement shows that the antenna has the average gain of 5.1 dBi from 2.1 to 3.0 GHz. It has impendence bandwidth (IBW) from 1.65 to 3.73 GHz (77.3%) and axial ratio bandwidth (ARBW) from 2.1 to 2.95 GHz (33.6%). Desirable radiation patterns are achieved. This letter proves the feasibility of antenna optimization by using both innovative design and advanced fabrication process.