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Improving the Dual-band 10 & 24 GHz Feedhorn for Offset Dishes

By Paul Wade Wghz


Operating multiple bands in the 10 GHz and Up contest is difficult with separate antennas – after locating a station on 10 GHz and peaking the dish, we must start over on a higher band, usually with a narrower beamwidth. Using a dual-band feedhorn for 10 and 24 GHz would very attractive; the dish may first be pointed and peaked up on 10 GHz, then switched over to 24 GHz with no repositioning required. At Microwave Update 2001, AD6FP and AA6IW described 1 a dual-band 10 and 24 GHz feedhorn for shallow and offset dishes. The design was based on previous work of W5LUA 2 and W5ZN 3,4 to develop a dual-band feedhorn more suitable for conventional deep dishes. With the offset dish, we have a distinct advantage – the equipment may be located very near the feedhorn without being in the radiation pattern, minimizing the large feedline losses at the higher microwave frequencies without decreasing gain. Other advantages include higher efficiency feedhorns, less critical focusing, and the ready availability of modest-sized DSS dishes with good surface accuracy. Gary and Lars included computer simulated radiation pattern plots which look like potentially good feeds, but did not do dish efficiency calculations. However, they di

Year: 2008
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