Antenna arrangement
Номер патента: DE3908846A1
Опубликовано: 16-11-1989
Автор(ы): Heinrich Garn
Принадлежит: Oesterr Forsch Seibersdorf
Опубликовано: 16-11-1989
Автор(ы): Heinrich Garn
Принадлежит: Oesterr Forsch Seibersdorf
Реферат: The invention relates to an antenna arrangement for frequency-selective field strength measurement of radio-frequency electromagnetic alternating fields ("radio waves"), comprising an antenna which is connected to a receiver (5) via an RF pre-amplifier (4). The invention provides that, in order to avoid field distortions which corrupt (disturb) the measurement, the pre-amplifier (4) is a differential amplifier with a balanced input and an unbalanced output, that the magnitude of the pre-amplifier input impedance is greater than four times the magnitude of the base impedance of the balanced antenna (1), that the overall length of the antenna (1) is less than one quarter of the operating wavelength, and that the antenna (1) is not resonant. <IMAGE>
Radar Antenna Arrangement
Номер патента: US20210234261A1. Автор: Michael Vogt,Michael Gerding,Thomas Convent,Christian Schulz,Christoph Dahl. Владелец: Krohne Messtechnik GmbH and Co KG. Дата публикации: 2021-07-29.