US 2014/0197901 A1 · Feed Network

Abstract

A feed network includes three radio frequency (RF) devices constructed in a suspended-substrate stripline configuration that provides a five-port microwave device having a sum port and four feed ports. The three RF devices include at least one coupled-line quadrature hybrid and at least one Marchand balun. Each of the at least one coupled-line quadrature hybrid has only a single transmission line section 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 separated by a gap 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.

Claims20

Dependent claims

A feed network comprising:

three radio frequency (RF) devices constructed in a suspended-substrate stripline configuration that provides a five-port microwave device having a sum port and four feed ports, the three RF devices including at least one coupled-line quadrature hybrid and at least one Marchand balun;
wherein each of the at least one coupled-line quadrature hybrid has only a single transmission line section providing two outputs with approximately equal amplitude power and a phase difference of 90°;
wherein each of the at least one Marchand balun includes two offset-coupled transmission line sections separated by a gap and two outputs on opposite sides of the gap, the two outputs having approximately equal amplitude power and a phase difference of 180′;
and
wherein 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.

2 more elements

A feed network comprising:

three radio frequency (RF) devices constructed in a suspended-substrate stripline configuration that provides a five-port microwave device having a sum port and four feed ports, the three RF devices comprising:
first and second coupled-line quadrature hybrids each having only a single transmission line section that provides two outputs with approximately equal amplitude power and a phase difference of 90°;
and
a Marchand balun having two offset-coupled transmission line sections separated by a gap and two outputs on opposite sides of the gap, the two outputs having approximately equal amplitude power and a phase difference of 180°, wherein the Marchand balun and the first and second coupled-line quadrature hybrids 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.

1 more element

Dependencies are inferred from the claim text.

Feed Network

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Feed Network

Life of this patent

Abstract

Claims20