# US 2014/0197901 A1 · Feed Network > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0197901 A1 - Document ID: US20140197901A1 - Status: Published application - Kind: A1 - Application number: 13/840,355 - Filed: 2013-03-15 - Published: 2014-07-17 - Earliest claimed: 2013-01-15 - Assignees: Tyco Electronics Corporation - Inventors: Bruce Foster Bishop; Kathleen Fasenfest - Web page: https://patentgrep.com/patent/US20140197901A1 ## CPC - H01P 5/12: Coupling devices having more than two ports (H01P5/04 takes precedence) - H01P 5/10: for coupling balanced lines or devices with unbalanced lines or devices - H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B) ## 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. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) The feed network of claim 1, wherein the at least one coupled-line quadrature hybrid is a single coupled-line quadrature hybrid and the at least one Marchand balun is two Marchand baluns. ### Claim 3 (depends on 1) The feed network of claim 1, wherein the at least one Marchand balun is a single Marchand balun and the at least one coupled-line quadrature hybrid is two coupled-line quadrature hybrids. ### Claim 4 (depends on 1) The feed network of claim 1, wherein the four feed ports comprise first, second, third, and fourth feed ports, the at least one Marchand balun is a single Marchand balun, and the at least one coupled-line quadrature hybrid comprises first and second coupled-line quadrature hybrids, the Marchand balun being electrically connected between the sum port and the first and second coupled-line quadrature hybrids and being configured to divide an input RF signal into first and second intermediate RF signals with approximately equal power amplitudes and a phase difference of 180°, the first coupled-line quadrature hybrid being electrically connected between the Marchand balun and the first and second feed ports and being configured to divide the first intermediate RF signal into first and second feed RF signals having phases of 0° and 90°, respectively, the second coupled-line quadrature hybrid being electrically connected between the Marchand balun and the third and fourth feed ports and being configured to divide the second intermediate RF signal into third and fourth feed RF signals having phases of 180° and 270°, respectively. ### Claim 5 (depends on 1) The feed network of claim 1, wherein the four feed ports comprise first, second, third, and fourth feed ports, the at least one coupled-line quadrature hybrid is a single coupled-line quadrature hybrid, and the at least one Marchand balun comprises first and second Marchand baluns, the coupled-line quadrature hybrid being electrically connected between the input port and the first and second Marchand baluns and being configured to divide an input RF signal into first and second intermediate RF signals with approximately equal power amplitudes and a phase difference of 90°, the first Marchand balun being electrically connected between the coupled-line quadrature hybrid and the first and third feed ports and being configured to divide the first intermediate RF signal into first and third feed RF signals having phases of 0° and 180°, respectively, the second Marchand balun being electrically connected between the coupled-line quadrature hybrid and the second and fourth feed ports and being configured to divide the second intermediate RF signal into second and fourth feed RF signals having phases of 90° and 270°, respectively. ### Claim 6 (depends on 1) The feed network of claim 1, wherein the transmission line section of the at least one coupled-line quadrature hybrid is a uniformly-coupled transmission line section. ### Claim 7 (depends on 1) The feed network of claim 1, wherein the transmission line section of the at least one coupled-line quadrature hybrid is a non-uniformly coupled transmission line section. ### Claim 8 (depends on 1) The feed network of claim 1, wherein each of the transmission line sections of the at least one Marchand balun is a uniformly-coupled transmission line section. ### Claim 9 (depends on 1) The feed network of claim 1, wherein each of the transmission line sections of the at least one Marchand balun is a non-uniformly coupled transmission line section. ### Claim 10 (depends on 1) The feed network of claim 1, wherein the transmission line section of the at least one coupled-line quadrature hybrid includes two transmission line segments that are offset coupled. ### Claim 11 (depends on 1) The feed network of claim 1, wherein the transmission line section of the at least one coupled-line quadrature hybrid includes two transmission line segments that are broadside coupled. ### Claim 12 (depends on 1) The feed network of claim 1, wherein the at least one coupled-line quadrature hybrid has a characteristic impedance that is different than a characteristic impedance of at least one of the sum port or the feed ports. ### Claim 13 (depends on 1) The feed network of claim 1, wherein the transmission line section of the at least one coupled-line quadrature hybrid has an electrical length of one-quarter of a wavelength at the center frequency of operation. ### Claim 14 (depends on 1) The feed network of claim 1, wherein each transmission line section of the at least one Marchand balun has an electrical length of one-quarter of a wavelength at the center frequency of operation. ### Claim 15 (depends on 1) The feed network of claim 1, wherein the feed network is configured to operate over a bandwidth of at least approximately 10%. ### Claim 16 (depends on 1) The feed network of claim 1, wherein the feed network has a width of less than approximately 51 mm (2.0 inches). ### Claim 17 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. ### Claim 18 (depends on 17) The feed network of claim 17, wherein the four feed ports comprise first, second, third, and fourth feed ports, the Marchand balun being electrically connected between the sum port and the first and second coupled-line quadrature hybrids, the Marchand balun being configured to divide an input RF signal into first and second intermediate RF signals with approximately equal power amplitudes and a phase difference of 180°, the first coupled-line quadrature hybrid being electrically connected between the Marchand balun and the first and second feed ports, the first coupled-line quadrature hybrid being configured to divide the first intermediate RF signal into first and second feed RF signals having phases of 0° and 90°, respectively, the second coupled-line quadrature hybrid being electrically connected between the Marchand balun and the third and fourth feed ports, the second coupled-line quadrature hybrid being configured to divide the second intermediate RF signal into third and fourth feed RF signals having phases of 180° and 270°, respectively. ### Claim 19 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 Marchand baluns each 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°, and a coupled-line quadrature hybrids having only a single transmission line section that provides two outputs with approximately equal amplitude power and a phase difference of 90°, wherein the coupled-line quadrature hybrid and the first and second marchand baluns 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. ### Claim 20 (depends on 19) The feed network of claim 19, wherein the four feed ports comprise first, second, third, and fourth feed ports, the coupled-line quadrature hybrid being electrically connected between the sum port and the first and second Marchand baluns, the coupled-line quadrature hybrid being configured to divide an input RF signal into first and second intermediate RF signals with approximately equal power amplitudes and a phase difference of 90°, the first Marchand balun being electrically connected between the coupled-line quadrature hybrid and the first and third feed ports, the first Marchand balun being configured to divide the first intermediate RF signal into first and third feed RF signals having phases of 0° and 180°, respectively, the second Marchand balun being electrically connected between the coupled-line quadrature hybrid and the second and fourth feed ports, the second Marchand balun being configured to divide the second intermediate RF signal into second and fourth feed RF signals having phases of 90° and 270°, respectively.