| 摘要 |
A high efficient wideband cassegrain antenna with non radiative microstrip line is provided to improve communications arrival distance by reducing conversion loss when TE / TM signals are transformed to TEM signals. A sub-reflector(11) is positioned at the focus of a main reflector(10). A power feeder(21) is positioned at the focus of sub-reflector. A mode conversion strip converts TE / TM electric wave coming into the main reflector, the sub-reflector and the power feeder into the TEM mode electric wave. The TEM mode electric wave is transformed into Quasi-TEM mode electric wave through a tapered shape metal block. The Quasi-TEM mode electric wave is delivered to a SMA connector(26) according to a microstrip line. Right and left interval and top and bottom(a) interval between the microstrip line and the top and bottom metal blocks(13,14) are within lambda / 2 of serving frequency. A ground line is formed with constant interval in right and left of the microstrip line. A through-hole is consecutively formed in the ground line according to the microstrip line. The SMA connector or the communications circuit is connected to the end of the microstrip line. |
