A waveguide coupler includes a waveguide having a first and a second port, and a slot formed in a broadwall of the waveguide between the first and second ports, the slot centered on the first broadwall. A plurality of shifted waveguide sections are arranged between the first and second ports and extend along a length of the waveguide. A parallel-plate transmission line structure is coupled to the slot, wherein RF signals within one of the waveguide or the parallel-plate transmission line are communicated to the other of the waveguide and the parallel-plate transmission line through the slot.

A waveguide rotary joint includes a first waveguide member comprising a first waveguide portion, and a second waveguide member comprising a second waveguide portion, the second waveguide member rotatably connected via a curved circumferential path to the first waveguide member, wherein the second waveguide portion is adjacent to the first waveguide portion to define a first split rectangular waveguide. A first waveguide input/output port is communicatively coupled to the first waveguide portion, and a second waveguide input/output port is communicatively coupled to the second waveguide portion. Relative rotation between the first waveguide member and the second waveguide member changes an angular length of the first waveguide connecting the first waveguide input/output port to the second waveguide input/output port.

A waveguide coupler includes a waveguide having a first and a second port, and a slot formed in a broadwall of the waveguide between the first and second ports, the slot centered on the first broadwall. A plurality of shifted waveguide sections are arranged between the first and second ports and extend along a length of the waveguide. A parallel-plate transmission line structure is coupled to the slot, wherein RF signals within one of the waveguide or the parallel-plate transmission line are communicated to the other of the waveguide and the parallel-plate transmission line through the slot.

An antenna may include a reflector and a multi-band feed assembly. A support member may be coupled to the multi-band feed assembly to orient the multi-band feed assembly for direct illumination of the reflector. The multi-band feed assembly may include first and second feeds, each having a respective septum polarizer coupled between a respective common waveguide and a respective pair of waveguides. A housing of the support member may contain the respective septum polarizers and the respective pairs of waveguides.

A transmission line includes a laminated insulating body including insulating base material layers that are laminated, signal conductors provided inside the laminated insulating body and extending in a transmission direction along the insulating base material layer, and ground conductors sandwiching the signal conductors in a lamination direction via the insulating base material layers. The transmission line includes at least one curved portion that is bent along a plane orthogonal to the lamination direction. The signal conductors are separated from each other in a direction orthogonal to the transmission direction when viewed in the lamination direction and include a first signal conductor on an inner side and a second signal conductor on an outer side in the curved portion. An interval between the ground conductors sandwiching the first signal conductor is narrower than an interval between the ground conductors sandwiching the second signal conductor.

A waveguide rotary joint includes a first waveguide member comprising a first waveguide portion, and a second waveguide member comprising a second waveguide portion, the second waveguide member rotatably connected via a curved circumferential path to the first waveguide member, wherein the second waveguide portion is adjacent to the first waveguide portion to define a first split rectangular waveguide. A first waveguide input/output port is communicatively coupled to the first waveguide portion, and a second waveguide input/output port is communicatively coupled to the second waveguide portion. Relative rotation between the first waveguide member and the second waveguide member changes an angular length of the first waveguide connecting the first waveguide input/output port to the second waveguide input/output port.

Embodiments of the invention include an integrated monopulse comparator assembly for use in tracking antenna applications such as an antenna feed or an antenna array. Embodiments of the monopulse comparator assembly may include four rectangular waveguide antenna inputs, four magic tees, rectangular waveguide connections, and four rectangular waveguide monopulse outputs. An embodiment of a 44 antenna array including an embodiment of an integrated monopulse comparator assembly is also disclosed.

A waveguide disclosed herein may be implemented as a hollow irregular hexagonal metal structure which receives an electromagnetic signal and propagates the signal through the hollow hexagonal metal structure. The waveguide may be fabricated using metal additive manufacturing techniques and include one or more downward facing and unsupported surfaces.

An antenna may include a reflector and a multi-band feed assembly. A support member may be coupled to the multi-band feed assembly to orient the multi-band feed assembly for direct illumination of the reflector. The multi-band feed assembly may include first and second feeds, each having a respective septum polarizer coupled between a respective common waveguide and a respective pair of waveguides. A housing of the support member may contain the respective septum polarizers and the respective pairs of waveguides.

A dual-polarized antenna array for a one-dimensional (1D) active electronically steerable array (AESA) includes first and second arrays of open-ended waveguide elements interleaved with one another, each array including a plurality of corporate networks extending transverse to a scan plane SP and having a series of the elements spaced transversely of the scan plane, and wherein each of element is coupled to a respective corporate network by a waveguide twist and oriented oblique to the scan plane. The waveguide elements of one array are oriented orthogonal to the waveguide elements of the other array.