講演名 2004/10/15
Radiation Characteristics of Phased Array Antennas with Reduced True Time Delay Devices : Numerical Analysis with Linear Array Antenna Models(Component & Antenna II)(Joint Conference on Satellite Communications 2004(JC-SAT 2004))
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抄録(和)
抄録(英) Phased array antennas (PAAs) have combinations of 360-degree phase shifters and true time delay (TTD) devices for the purpose of beam forming. The number of TTD devices is desirable to be reduced because PAA systems require miniaturization, lightness, and ease of control. The most obvious way to reduce the number of TTD devices is to group elements of the array into subarrays and to insert a TTD device into each subarray. However, if the number of TTD devices is reduced sharply when the PAA transmits or receives a wideband signal, the direction of the mainbeam at the off-center frequency shifts away from the target direction, because the wavefront of each subarray differs from a perfect wavefront at the center frequency. Gain variation, which depends on frequency in the target direction, occurs as a result of the beam shift. In this report, the results of the numerical analysis about the changes of electrical characteristics while reducing the number of TTD devices are shown. Since there is no noticeable degradation of characteristics, we conclude that the number of TTD devices can be reduced to about four.
キーワード(和)
キーワード(英) phased array antennas / true time delay devices / phase shifters
資料番号 SAT2004-134
発行日

研究会情報
研究会 SAT
開催期間 2004/10/15(から1日開催)
開催地(和)
開催地(英)
テーマ(和)
テーマ(英)
委員長氏名(和)
委員長氏名(英)
副委員長氏名(和)
副委員長氏名(英)
幹事氏名(和)
幹事氏名(英)
幹事補佐氏名(和)
幹事補佐氏名(英)

講演論文情報詳細
申込み研究会 Satellite Telecommunications (SAT)
本文の言語 ENG
タイトル(和)
サブタイトル(和)
タイトル(英) Radiation Characteristics of Phased Array Antennas with Reduced True Time Delay Devices : Numerical Analysis with Linear Array Antenna Models(Component & Antenna II)(Joint Conference on Satellite Communications 2004(JC-SAT 2004))
サブタイトル(和)
キーワード(1)(和/英) / phased array antennas
第 1 著者 氏名(和/英) / Takumi HASEGAWA
第 1 著者 所属(和/英)
Space Engineering Development Co., Ltd. (SED)
発表年月日 2004/10/15
資料番号 SAT2004-134
巻番号(vol) vol.104
号番号(no) 352
ページ範囲 pp.-
ページ数 6
発行日