| 摘要 |
An antenna for simultaneous microwave transmission and reception is disclosed. The antenna comprises an array of wave-guides (10, 16) arranged side-by-side. In a typical embodiment of the array the wave-guides are rectangular wave-guides comprising a symmetrically or un-symmetrically placed ridge (8) and forming an array of vertical or horizontal columns. Opposite to the ridge at a second wall of the rectangular wave-guide slots (20, 21, 27, 28) are provided in the front wall, each aperture wave-guide being made narrow-band tuned for a respective transmitting or a receiving frequency in order to achieve a low coupling between transmitting and receiving to facilitate simultaneous transmission and reception at equal polarisation. Furthermore parallel to the array of slotted wave-guides a wave-guide filter (30, 35) may be arranged at each side forming a respective transmitting signal filter and a receiving signal filter to form a compact single aperture transmit/receive microwave antenna unit. In the typical embodiment slots are cut in a direction parallel to the extension of the wave-guide columns. Every second slot is further positioned displaced to each side of an EMAX at the front wall. In a further embodiment presenting a different transmit and receive polarisation either the receive or transmit portion comprises regular rectangular wave-guides, which present radiating slots in their front facing short side wall. These slots are directed at an angle across the front wall of the column thereby generating a different polarisation between the simultaneous transmission and reception portions of the antenna array. |
