TY - GEN
T1 - Design of wideband small spiral antenna for SAR
AU - Iitsuka, Y.
AU - Koyama, C. N.
AU - Takahashi, Kazunori
AU - Sato, M.
PY - 2016/1/6
Y1 - 2016/1/6
N2 - A design of a wideband small spiral antenna for SAR is proposed. First, to miniaturize the spiral size, characteristics of input impedance and axial ratio for equiangular and Archimedean spiral antennas are analyzed regarding the effects of substrate and spiral turn. It is found that the miniaturized 6-turn Archimedean spiral antenna on a FR-4 substrate which is 4.4 cm in diameter has the good characteristics over a frequency range of 3 GHz to 20 GHz. Second, by experimentally observing time domain radar characteristics, it is confirmed that a cavity 6.1 cm deep sufficiently filled with an EM absorber is effective to obtain clear radar signals. It is also found that leaving a space between Tx and Rx antennas is important to improve the power ratio of a reflected wave to a direct wave.
AB - A design of a wideband small spiral antenna for SAR is proposed. First, to miniaturize the spiral size, characteristics of input impedance and axial ratio for equiangular and Archimedean spiral antennas are analyzed regarding the effects of substrate and spiral turn. It is found that the miniaturized 6-turn Archimedean spiral antenna on a FR-4 substrate which is 4.4 cm in diameter has the good characteristics over a frequency range of 3 GHz to 20 GHz. Second, by experimentally observing time domain radar characteristics, it is confirmed that a cavity 6.1 cm deep sufficiently filled with an EM absorber is effective to obtain clear radar signals. It is also found that leaving a space between Tx and Rx antennas is important to improve the power ratio of a reflected wave to a direct wave.
KW - absorber
KW - antenna miniaturization
KW - spiral antenna
KW - synthetic aperture radar
KW - time-domain characteristics
UR - http://www.scopus.com/inward/record.url?scp=84978427890&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84978427890&partnerID=8YFLogxK
U2 - 10.1109/APCAP.2015.7374364
DO - 10.1109/APCAP.2015.7374364
M3 - Conference contribution
AN - SCOPUS:84978427890
T3 - Proceedings of the 2015 IEEE 4th Asia-Pacific Conference on Antennas and Propagation, APCAP 2015
SP - 261
EP - 262
BT - Proceedings of the 2015 IEEE 4th Asia-Pacific Conference on Antennas and Propagation, APCAP 2015
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 4th IEEE Asia-Pacific Conference on Antennas and Propagation, APCAP 2015
Y2 - 30 June 2015 through 3 July 2015
ER -