| 摘要 |
<p>A feed network (12) includes three radio frequency (RF) devices constructed in a suspended-substrate stripline configuration that provides a five-port microwave device having a sum port (30) and four feed ports (32a, 32b, 32c, 32d). The three RF devices include at least one coupled-line quadrature hybrid (36) and at least one Marchand balun (34). Each of the at least one coupled-line quadrature hybrid has only a single transmission line section (150) providing two outputs with approximately equal amplitude power and a phase difference of 90°. Each of the at least one Marchand balun includes two offset-coupled transmission line sections (86, 87) separated by a gap (G) and two outputs on opposite sides of the gap. The two outputs have approximately equal amplitude power and a phase difference of 180°. The three RF devices are electrically arranged relative to the sum port and the four feed ports such that the feed ports have equal amplitude power and a progressive 90° phase shift.</p> |
