Abstract
AbstractA compact‐size circularly polarized antenna is investigated by employing high‐permittivity and low‐loss substrate (i.e., high Q × f value) for 2.5‐GHz application. The antenna was individually fabricated on nano‐Al2O3 (εr = 9.7, Q × f value of 500,000 GHz) and Al2O3 (εr = 9.7, Q × f value of 200,000 GHz) substrates. The high‐permittivity and low‐loss ceramic substrate (nano‐Al2O3 substrate) was used to reduce the microstrip antenna dimension on patch size. In addition, the ceramic substrate was studied for broadening the 3‐dB axial ratio bandwidth [circular polarization (CP) bandwidth]. The obtained CP bandwidth is about 80 MHz (∼3.2%) at 2.5 GHz. The proposed antenna occupies a size of 23.4 × 23.4 × 4 mm3 and obtains the operation bandwidth of about 90.96 MHz. Good antenna gain and CP radiation patterns have also been observed. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2317–2320, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21909
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