For the first time, a MgAl2O4 transparent ceramics cylindrical dielectric resonator (DR) antenna (DRA) is designed using the fundamental HE11δ modes for a slot-coupled cylindrical DRA. The transparent microwave dielectric...
Transparent
material has been widely used in product design and
has seen a large increase in its use. In this paper, a kind of aesthetically
decorative 5 GHz Wi-Fi dielectric resonator antenna (DRA) of aluminum
oxynitride (AlON) transparent ceramic has been designed. High-quality-factor
AlON transparent dielectric ceramics were fabricated by presintering
at 1780 °C and further cold isostatic pressing (CIP) under a
200 MPa argon atmosphere. For a 9.0 mm thick specimen, the in-line
light transmittance reached 83%. Optimum dielectric constant (εr = 9.32), quality factor (Q
f = 47 960) and temperature coefficient (TCF = −51.7
ppm/°C) was achieved in the AlON transparent ceramic by cold
isostatic pressing. As a result, the proposed aesthetically decorative
DRA can achieve an impedance bandwidth of 32% (4.48–6.19 GHz),
a high radiation efficiency of 85%, and a low cross-polarization discrimination
(XPD) of −30 dB. To achieve a broad bandwidth, the proposed
antenna was excited in its dominant TE111
x
mode and higher-order
TE113
x
mode. The proposed antenna is thus an excellent candidate
for an indoor decoration Wi-Fi antenna.
This study presents the microwave dielectric properties calculation of (1-x)Ba 3.75 Nd 9.5 Cr 0.25 Nb 0.25 Ti 17.5 O 54 -xNdAlO 3 ceramics where x denotes the volume molar fraction. From X-ray diffraction results, the solid solution limit is calculated to be about 0.76, where it forms a single BaNd 2 Ti 4 O 12 phase in Region I (0 ≤ x ≤ 0.76), and both BaNd 2 Ti 4 O 12 and NdAlO 3 coexist in Region II (0.76 < x < 1). The solid solution limit is confirmed by independently calculating it from the dielectric constant data. There is less than 4 % deviation between the measured dielectric constant (ε r ) and the one calculated from the Maxwell-Wagner formula. The total quality factor (Q) remains almost constant in Region I and increases rapidly with the volume molar fraction of NdAlO 3 in Region II. The measured Q×f, where f is the resonant frequency, is also consistent with the calculated value in both regions. The temperature coefficient at the resonant frequency is -1.4 ppm/ o C, which agrees well with the calculated value of 0 ppm/ o C. In addition, we observed a close correlation between the bulk density and the phase evolution.
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