| 摘要 |
FIELD: radio engineering, communication.SUBSTANCE: antenna feed unit (15) includes at least two elongated feed circuits (1, 2) placed next to each other. Each feed circuit is configured to transmit or receive electromagnetic radiation between itself and an antenna (34) along the longitudinal axis (3, 4) of the feed through a transmitting/receiving element (7). The feed circuits (1, 2) are held in a fixed arrangement relative each other by a first support and a second support (5, 6), spaced apart in the axial direction of the feed circuits. The transmitting/receiving elements (7, 8) continue from the first support (5) to the antenna, and the second support (6) is placed on the side of the first support (5) and at a certain distance from the antenna. The first support (5) has a smaller coefficient of thermal expansion in the transverse direction than the second support (6), which reduces translational movement of each transmitting/receiving element (7, 8) in the transverse direction, caused by change in temperature of the unit (15).EFFECT: avoiding antenna beam alignment error.15 cl, 12 dwg |
