A camera accessory attachable to and detachable from a bottom surface of a camera includes an accessory body, a fastening member configured to attach the accessory body to the bottom surface, an opening that allows a battery to be inserted into and ejected from the camera while the accessory body is attached to the bottom surface, and an accessory lid member attached to the accessory body and movable between an open position for opening the opening and a closed position for closing the opening.

A waveguide antenna system, includes: an electromagnetic, EM, transition portion having a transition region having a signal feed interface and an open waveguide section, the EM transition portion configured to couple EM energy from the signal feed interface to a guided waveguide mode of EM energy to the open waveguide section via the transition region; and a leaky waveguide antenna portion configured and disposed to radiate electromagnetic energy received from the open waveguide section; wherein the EM transition portion is electromagnetically coupled to the leaky waveguide antenna portion, the EM transition portion being configured to support a transfer of electromagnetic energy from a signal feed structure to the leaky waveguide antenna portion.

According to various embodiments, systems and methods for spatial sampling in proximity to the Nyquist limit in traveling-wave antenna systems are disclosed. An apparatus can include a traveling-wave antenna array comprising a plurality of adjacent traveling-wave antennas that each include a plurality of tunable elements that are spaced at, near, or above a Nyquist limit spacing to form an array of tunable elements. The apparatus also includes a phase diversity feed coupled to the traveling-wave antenna array that is configured to provide input to the traveling-wave antenna array including phase diverse input to two or more of the plurality of adjacent traveling-wave antennas. Further, the apparatus includes a plurality of grayscale tuning elements configured to tune the plurality of tunable elements along one or more ranges of one or more tuning variables to form one or more specific output radiation patterns through the traveling-wave antenna array based on the input.

According to various embodiments, systems and methods for spatial sampling in proximity to the Nyquist limit in traveling-wave antenna systems are disclosed. An apparatus can include a traveling-wave antenna array comprising a plurality of adjacent traveling-wave antennas that each include a plurality of tunable elements that are spaced at, near, or above a Nyquist limit spacing to form an array of tunable elements. The apparatus also includes a phase diversity feed coupled to the traveling-wave antenna array that is configured to provide input to the traveling-wave antenna array including phase diverse input to two or more of the plurality of adjacent traveling-wave antennas. Further, the apparatus includes a plurality of grayscale tuning elements configured to tune the plurality of tunable elements along one or more ranges of one or more tuning variables to form one or more specific output radiation patterns through the traveling-wave antenna array based on the input.

Devices or apparatuses for changing settings of a neutralization line are described. A radio device may include a neutralization line coupled between a first antenna and a second antenna. The neutralization line has a variable component and the first and the second antennas are electromagnetically coupled and have a first coupling value. The neutralization line is controlled by a controller. The controller is coupled to the first antenna port, the second antenna port and the neutralization line. The controller detects an environmental condition that causes the first coupling value increase to a second coupling value. The controller also adjusts a value of the variable component to change a resistance value or, a reactance value, or both of the adaptive neutralization line to achieve a third coupling value that is lower than the second coupling value.

A cable type antenna is provided having a small-sized lightweight configuration and enabling specifying of a radiation region having a desired antenna length. The cable type antenna may be sectionalized into a first region on the power feeding circuit side and a second region on the leading end side. The cable type antenna of the present disclosure further comprises a balanced-to-unbalanced transformer element disposed between the first region and the second region, wherein the balanced-to-unbalanced transformer element includes an unbalanced-side terminal connected to the first region and a balanced-side terminal connected to the second region configured to allow the first region to serve as a non-radiation part and the second region to serve as a radiation part.

A cable type antenna is provided having a small-sized lightweight configuration and enabling specifying of a radiation region having a desired antenna length. The cable type antenna may be sectionalized into a first region on the power feeding circuit side and a second region on the leading end side. The cable type antenna of the present disclosure further comprises a balanced-to-unbalanced transformer element disposed between the first region and the second region, wherein the balanced-to-unbalanced transformer element includes an unbalanced-side terminal connected to the first region and a balanced-side terminal connected to the second region configured to allow the first region to serve as a non-radiation part and the second region to serve as a radiation part.

In a meta-structure having multifunctional properties according to an exemplary embodiment of the present invention, a plurality of unit blocks controlling a property of a wave is combined on a plane or in a space in a predetermined pattern to form one structure, at least one of the plurality of unit blocks is formed to have a different size, and a frequency range of a wave controlled is changed according to the size of the unit block.

In a meta-structure having multifunctional properties according to an exemplary embodiment of the present invention, a plurality of unit blocks controlling a property of a wave is combined on a plane or in a space in a predetermined pattern to form one structure, at least one of the plurality of unit blocks is formed to have a different size, and a frequency range of a wave controlled is changed according to the size of the unit block.

According to various embodiments, systems and methods for spatial sampling in proximity to the Nyquist limit in traveling-wave antenna systems are disclosed. An apparatus can include a traveling-wave antenna array comprising a plurality of adjacent traveling-wave antennas that each include a plurality of tunable elements that are spaced at, near, or above a Nyquist limit spacing to form an array of tunable elements. The apparatus also includes a phase diversity feed coupled to the traveling-wave antenna array that is configured to provide input to the traveling-wave antenna array including phase diverse input to two or more of the plurality of adjacent traveling-wave antennas. Further, the apparatus includes a plurality of grayscale tuning elements configured to tune the plurality of tunable elements along one or more ranges of one or more tuning variables to form one or more specific output radiation patterns through the traveling-wave antenna array based on the input.