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An uni-directional antenna designed by resonance-based reflector has the merits of compact size, low-profile, and ultra-wide impedance bandwidth. However, its front to back ratio (FBR) bandwidth is narrow owing to the small reflection coefficient values at the high frequencies of the RBR in-phase band. To solve this problem, a ring-shaped director (RD) was placed above a resonance-based reflector-based...
A very compact wide-band triple-band two-strip monopole antenna is proposed for wireless handsets. The two-strip monopole antenna comprises two strips which are printed on the different sides of RF4 substrate, and a two-strip is applied to enhance the impedance bandwidth. The antenna achieves a bandwidth of 51.5% at the 2-GHz band (1.71-2.74 GHz), 6% at the 3.5-GHz band (3.4-3.6 GHz), and 16% at the...
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