An antenna assembly has a conductive line coupled to a feed point. An element is configured to resonate at a predetermined frequency. The element is electrically coupled to the conductive line and aligned perpendicular to the conductive line wherein the predetermined frequency of the element determines a distance from the feed point along the conductive line.

An antenna assembly has a conductive line coupled to a feed point. An element is configured to resonate at a predetermined frequency. The element is electrically coupled to the conductive line and aligned perpendicular to the conductive line wherein the predetermined frequency of the element determines a distance from the feed point along the conductive line.

An instrument landing system (ILS) is described. The ILS comprises a plurality of antennas and a plurality of antenna radio units (ARUs). Each ARU of the plurality of ARUs operates to generate a modulated RF signal provided to a different one of the plurality of antennas for transmission. The ILS further comprises a central processing unit that operates to control the ARUs to adjust synchronization between the modulated RF signal provided by the ARUs to the plurality of antennas for transmission.

The invention relates to a wire antenna adapted to operate in at least one predetermined frequency band, comprising a plurality of superimposed layers, comprising at least one radiating element placed on a support layer, wherein the support layer is placed on a spacer substrate, and wherein the spacer substrate is placed on a reflector plane comprising at least one resistive layer between the support layer of the radiating element(s) and the substrate spacer, while the resistive layer comprises at least two sets of nested resistive patterns. This antenna is such that the sets of resistive patterns have resistance values gradually varying between a central antenna point and an outer edge of the antenna, in order to achieve a resistance gradient.

A multi-band antenna has a feed point, a grounding location, a first portion for low band operation, a second portion for low band operation, and one or more portions for high band operation. The ground reference of the feed point for the multi-band antenna is connected to a separate object that may provide a base for the multi-band antenna. The feed point of the multi-band antenna may be spaced above the base and have a space between the feed point and a location for the ground point. The low band portion has multiple resonances that are often odd multiples of the lowest resonant response. The portions that resonant most dominantly in the high band often have multiple resonances that are even multiples of the lowest high band resonance. The multi-band antenna has resonances spaced closely enough to appear to be a wide band antenna above the fundamental high band resonance.

Embodiments of the present invention provides an antenna and an antenna system. The antenna includes a body member, a head member integrally connected to a first edge of the body member, wherein the head member forms a fold having a first angle towards the front face of the body member, and a first arm member and a second arm member, wherein the first arm member and the second arm member are integrally connected to the body member corresponding to the second edge and the third edge of the body member, and wherein the set of arm members each form a fold having a second angle towards the front face of the body member.

The invention relates to a wire antenna suitable for operating in at least one frequency band, including a plurality of stacked layers, including at least one radiating element placed on a support layer, said support layer being placed on a spacing substrate placed on a reflective plane, characterised in that it includes at least one resistive grille having a resistive surface with predetermined resistance, including at least one set of repetitive, non-contiguous empty patterns, said grille being placed between the spacing substrate and the reflective plane.

A log periodic antenna system with conformal radiating elements includes a feed layer with phase shifters and filters associated with each radiating element. The filters may be low-pass or band-pass filters. The log periodic conformal radiating elements produce superior gain and bandwidth, and reduce directionality of the antenna at least along a radial axis of the antenna. Sets of conformal radiating elements are disposed on opposing sides of the antenna, or periodically around the surface of the antenna, to further reduce directionality.

A log periodic antenna system with conformal radiating elements includes a feed layer with phase shifters and filters associated with each radiating element. The filters may be low-pass or band-pass filters. The log periodic conformal radiating elements produce superior gain and bandwidth, and reduce directionality of the antenna at least along a radial axis of the antenna. Sets of conformal radiating elements are disposed on opposing sides of the antenna, or periodically around the surface of the antenna, to further reduce directionality.

An instrument landing system (ILS) is described. The ILS comprises a plurality of antennas and a plurality of antenna radio units (ARUs). Each ARU of the plurality of ARUs operates to generate a modulated RF signal provided to a different one of the plurality of antennas for transmission. The ILS further comprises a central processing unit that operates to control the ARUs to adjust synchronization between the modulated RF signal provided by the ARUs to the plurality of antennas for transmission.