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A mirror-integrated dielectric resonator antenna (MIDRA) is proposed. The mirror consists of a glass layer with a very thin light-reflective film coated at its back. It is overlaid on top of a dielectric resonator antenna (DRA), forming a two-layer DRA when the thin light-reflective film is neglected. To allow the wave to penetrate from the DRA to the glass layer, the film is made of nonconducting alternate layers of titanium dioxide (TiO2) and silicon dioxide (SiO2) instead of the traditional conducting silver (Ag) or aluminum (Al) coating. To demonstrate the idea, two cylindrical MIDRAs were designed and fabricated. The first one is excited in its TM01δmode by axially feeding it with a coaxial probe, giving an omnidirectional radiation pattern. For the second design, the broadside HEM11δmode is excited by using a slot-coupled source fed by a microstrip line. Experimental results show that these two MIDRAs radiate effectively as conventional DRAs. Since the proposed antenna appears to be a mirror, it can be an excellent hidden antenna that provides practical mirror functions.
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Yang et al. (2013) studied this question.
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