A transition structure for millimeter wave is provided. The transition structure includes a first layer signal element coupled to an end of a first transmission line and a plurality of first layer ground elements surrounding the end of the first transmission line equidistantly from the end of the first transmission line and disposed along two opposite sides of a strip body of the first transmission line equidistantly from the strip body of the first transmission line. The transition structure further includes an intermediate layer signal element coupled to the first layer signal element and a plurality of intermediate layer ground elements surrounding the intermediate layer signal element quasi-coaxially. A multilayer transition structure including a multilayer structure and the transition structure is also provided. Therefore, the problem of operating frequency caused by the thickness of the multilayer structure can be overcome, thereby increasing the resonance frequency of the multilayer structure.

A transition structure for millimeter wave is provided. The transition structure includes a first layer signal element coupled to an end of a first transmission line and a plurality of first layer ground elements surrounding the end of the first transmission line equidistantly from the end of the first transmission line and disposed along two opposite sides of a strip body of the first transmission line equidistantly from the strip body of the first transmission line. The transition structure further includes an intermediate layer signal element coupled to the first layer signal element and a plurality of intermediate layer ground elements surrounding the intermediate layer signal element quasi-coaxially. A multilayer transition structure including a multilayer structure and the transition structure is also provided. Therefore, the problem of operating frequency caused by the thickness of the multilayer structure can be overcome, thereby increasing the resonance frequency of the multilayer structure.

A dual polarised planar antenna (10) comprising first (12) and second (13) antenna elements having respective orthogonal polarisations, the antenna elements (12, 13) being arranged in a back-to-back configuration and fed directly by respective first and second antenna feeds (15), wherein the dual polarised planar antenna (10) further comprises a parasitic element (14) arranged between the antenna elements (12, 13) such that in-use the antenna feeds (15) are decoupled. Particularly suited to low profile antennas and compact antenna base stations. Also relates to a method of manufacture.

A dual polarised planar antenna (10) comprising first (12) and second (13) antenna elements having respective orthogonal polarisations, the antenna elements (12, 13) being arranged in a back-to-back configuration and fed directly by respective first and second antenna feeds (15), wherein the dual polarised planar antenna (10) further comprises a parasitic element (14) arranged between the antenna elements (12, 13) such that in-use the antenna feeds (15) are decoupled. Particularly suited to low profile antennas and compact antenna base stations. Also relates to a method of manufacture.

Apparatus for Manufacture and In-Space Assembly of Antennas comprising: a prefabricated primary reflector center section; a trusselator truss assembler; a phased feed array; wherein said prefabricated reflector center section, trusselator, and phased feed array are fixedly connected to one another; a self-positioning and orienting tool; a truss extending from said trusselator; a secondary reflector attached to said truss; robotic arms; a nibbler end effector mounted on one of said robotic arms; a grapple end effector mounted on one of said robotic arms; a mold for casting a piece of a primary reflector; a power cube; a solar array providing power to said power cube; refabricator plus; and an ESPA ring.

Apparatus for Manufacture and In-Space Assembly of Antennas comprising: a prefabricated primary reflector center section; a trusselator truss assembler; a phased feed array; wherein said prefabricated reflector center section, trusselator, and phased feed array are fixedly connected to one another; a self-positioning and orienting tool; a truss extending from said trusselator; a secondary reflector attached to said truss; robotic arms; a nibbler end effector mounted on one of said robotic arms; a grapple end effector mounted on one of said robotic arms; a mold for casting a piece of a primary reflector; a power cube; a solar array providing power to said power cube; refabricator plus; and an ESPA ring.

A reflection unit of this disclosure is a reflection unit installed in a wireless transmission path between a first wireless device configured to at least transmit a wireless communication signal and a second wireless device configured to at least receive the wireless communication signal, in order to change a direction of the wireless transmission path. The reflection unit includes a plurality of reflectors configured to reflect the wireless communication signal. The plurality of reflectors include at least one reflectarray reflector.

A thin antenna includes an antenna element, a first spacer, a second spacer, a first ground plane and a second ground plane. The antenna element is formed in a column shape, and has a top surface and a bottom surface facing each other. The first and second spacers are made of an insulating material. The first ground plane is formed larger than the top surface of the antenna element. The second ground plane is formed larger than the bottom surface of the antenna element. The first ground plane is disposed to face the top surface of the antenna element via the first spacer. The second ground plane is disposed to face the bottom surface of the antenna element via the second spacer. A power is fed at one of the top surface and the bottom surface of the antenna element.

Base station antennas include an externally accessible active antenna module releasably coupled to a recessed segment that is over a chamber in the base station antenna and that is longitudinally and laterally extending along and across a rear of a base station antenna housing. The base station antenna housing has a passive antenna assembly that cooperates with the active antenna module.

Base station antennas include an externally accessible active antenna module releasably coupled to a recessed segment that is over a chamber in the base station antenna and that is longitudinally and laterally extending along and across a rear of a base station antenna housing. The base station antenna housing has a passive antenna assembly that cooperates with the active antenna module.