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A compact‐size circularly polarized antenna using low‐loss alumina substrates
Author(s) -
Tseng ChingFang,
Huang ChengLiang,
Hsu Allen
Publication year - 2006
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.21909
Subject(s) - bandwidth (computing) , microstrip antenna , microwave , materials science , optics , permittivity , axial ratio , ceramic , radiation pattern , patch antenna , circular polarization , optoelectronics , microstrip , physics , electrical engineering , telecommunications , antenna (radio) , dielectric , engineering , composite material
A 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‐Al 2 O 3 (ε r = 9.7, Q × f value of 500,000 GHz) and Al 2 O 3 (ε r = 9.7, Q × f value of 200,000 GHz) substrates. The high‐permittivity and low‐loss ceramic substrate (nano‐Al 2 O 3 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 mm 3 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