Open AccessWideband microstrip magnetoelectric dipole antenna with stripline aperture‐coupled excitation
Author(s) -
Cui Xuewu,
Yang Feng,
Gao Min,
Liang Zhipeng
Publication year - 2018
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2018.0078
Subject(s) - optics , radiation pattern , dipole antenna , wideband , standing wave ratio , microstrip antenna , antenna gain , physics , microstrip , stripline , antenna (radio) , materials science , antenna factor , optoelectronics , electrical engineering , engineering
A novel wideband microstrip magnetoelectric (ME) dipole antenna excited by a stripline aperture‐coupled feeding structure is proposed and demonstrated. An antenna prototype is fabricated with low‐cost standard printed circuit board process on three substrates and tested. Measured results show that an impedance bandwidth for voltage standing wave ratio (VSWR) < 2 is ∼42% (10.2–15.6 GHz), and a measured boresight gain is ∼7.8 ± 0.7 dBi. Almost stable and symmetrical unidirectional radiation patterns with low in cross‐polarization and backward radiation are obtained over the entire operating frequency band. By employing the proposed radiating element, two types of cavity (one is a square cavity, the other is a circular cavity) are introduced for enhancing the antenna gain and investigated. After analysis, a better one is chosen to be fabricated and measured. A measured impedance bandwidth for VSWR < 2 is ∼45% (10.1–15.9GHz), and a measured boresight gain is ∼8.9 ± 0.5 dBi. The measured average gain is ∼1.1 dBi larger than that of the radiating element. The measured radiation patterns, cross‐polarization levels and half power beam width are almost the same as that of the radiating element except that the measured front‐to‐back ratios are improved several decibels.