几篇ie 文章，好心人给下载一下，，，^-^:
Decade-bandwidth planar balun using CPW-to-slotline transition for UHF applications
Ultra wideband uniplanar MMIC balun using field transformations
A New Ultra-wideband Microstrip-to-CPS Transition
An ultra-wideband coupled-line balun using patterned ground shielding structures
A new wide-band planar balun on a single-layer PCB
A 6 to 20 GHz planar balun using a Wilkinson divider and Lange couplers
其实好人还是有的
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好人一生平安，，，{:7_1235:}{:7_1235:}
几篇ie 文章，好心人给下载一下，，，^-^: 5.PDF
