Abstract: A modular wideband antenna includes a ground plane, first and second antenna elements disposed on a first surface of a substrate, a first portion of a two-layer feed balun disposed on the first surface of the substrate, and electrically coupled to the first and second antenna elements, and to the ground plane, a second portion of the two-layer feed balun disposed on a second surface of the substrate, the second portion of the two-layer feed balun being electrically coupled to a signal feed, and being capacitively coupled to the first portion of the two-layer feed balun, first and second coupling capacitances disposed on the second surface of the substrate, the first coupling capacitance being capacitively coupled to the first antenna element, and the second coupling capacitance being capacitively coupled to the second antenna element, and first and second grounding posts being electrically coupled to the first and second coupling capacitances.

Abstract: A modular wideband antenna includes a ground plane, first and second antenna elements disposed on a first surface of a substrate, a first portion of a two-layer feed balun disposed on the first surface of the substrate, and electrically coupled to the first and second antenna elements, and to the ground plane, a second portion of the two-layer feed balun disposed on a second surface of the substrate, the second portion of the two-layer feed balun being electrically coupled to a signal feed, and being capacitively coupled to the first portion of the two-layer feed balun, first and second coupling capacitances disposed on the second surface of the substrate, the first coupling capacitance being capacitively coupled to the first antenna element, and the second coupling capacitance being capacitively coupled to the second antenna element, and first and second grounding posts being electrically coupled to the first and second coupling capacitances.

Abstract: The invention relates to an aircraft (1) having a passenger cabin (8) and a plurality of passenger seats (11) arranged in this passenger cabin (8), in which the passenger seats (11) are arranged in seat rows (13) one behind the other on a cabin floor (7), and a conveyor (15) for transporting objects, meals and/or beverages to the passenger seats (11) being within and/or below the cabin floor (7).

Abstract: In the context of the method for operating an ID-based access control system comprising at least one central server (4) and at least one access control device (2) which can be connected to the at least one central server (4) for the purposes of data communication, each access control device (2) has a zone assigned to it that has a unique zone ID. If a customer medium (1) is registered for the first time with respect to the validity of an access authorization by an online access control device (2) assigned to this zone, an offline data record is written to the customer medium (1), which, in the event that an access control device (2) in the same zone is offline and registers the customer medium (1), is read by the offline access control device (2) and used to determine the validity of the access authorization assigned to the ID of the customer medium (1).