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Varactor‐loaded compact folded dipole antenna for digital terrestrial radio reception
Author(s) -
Nakai Makoto,
Iizuka Hideo,
Sugiura Shinya,
Sato Kazuo
Publication year - 2010
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.25228
Subject(s) - standing wave ratio , electrical engineering , dipole antenna , antenna (radio) , monopole antenna , coaxial antenna , varicap , antenna measurement , loop antenna , physics , optoelectronics , antenna factor , microwave , engineering , materials science , microstrip antenna , telecommunications , capacitance , electrode , quantum mechanics
A varactor‐loaded folded dipole antenna is proposed for digital terrestrial radio reception. The antenna consists of a folded dipole with two pairs of varactors and controls resonant frequency without additional DC bias circuit. It has a compact structure with its arms bent. A prototype antenna with dimensions of 332 mm by 30 mm was printed on a polyethylene terephthalate film. The antenna in free space exhibited a frequency tuning range from 187 to 230 MHz, with a voltage standing wave ratio (VSWR) of less than 1.4 and gain from −1.4 to −3.1 dBi. The antenna put on glass maintained a VSWR of less than 1.3 from 188 to 192 MHz for digital terrestrial radio band. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1463–1466, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25228