Ultrawideband Co-polarized Simultaneous Transmit and Receive Aperture (STAR)

An eight-arm/port c-STAR single aperture configuration comprising:

• multi-mode characteristics of an eight-arm spiral aperture along with an applied excitation enabled high TX/RX isolation for diverse circular-polarization modes of radiation (i.e. broadside and split-beam modes).

An ultra-wideband dual-polarized multi-port monostatic co-channel simultaneous transmit and receive (c-STAR) aperture comprising:

• an aperture configured such that (N/2)-arms/ports are used for TX and (N/2)-arms/ports are used for RX;
• where N is equal or higher than 8.

A dual circularly polarized c-STAR circulator in aperture comprising:

• even and odd non-adjacent arms grouped and adapted to be fed through a single beam-former network (BFN):
• on transmit, two inputs correspond to two different circularity polarity handedness;
• one of the groups is adapted to transmit while another one of the groups is adapted to receive.

An ultra-wideband multi-mode true monostatic c-STAR antenna sub-system based on a four-arm spiral aperture comprising:

• a single aperture having dual functionality and the same antenna-port/arm is employed, wherein the sub-system is configured to utilize both feed self-interference cancellation and mode filtering.

An aperture comprising a plurality of arms wherein multi-mode characteristics of plurality of arms of the aperture along with applied excitation from the balanced circulator beam-former networks (BC-BFNs) enables high TX/RX isolation for diverse circular-polarization modes of radiations.

An aperture configuration for an antenna comprising a plurality of spiral arrays arranged in a generally hexagonal pattern (e.g., seven spiral arrays), wherein sets of corresponding arm-pairs of the arrays may be arrayed into the same feed networks.

An aperture configuration for an antenna comprising plurality of spiral arrays wherein the plurality of spiral arrays are arranged in a generally octagonal pattern, a transmit (TX)-array has a first radius different from a second radius of a receive (RX) array, where the RX-array has 0- or 45-degree rotation with respect to the TX-array.

A dual circularly polarized circulator in aperture transmit and receive configuration comprising:

• even and odd non-adjacent arms grouped and fed through a single BFN:
• on transmit, two inputs correspond to two different circularity polarity handedness, wherein one of the groups is adapted to transmit while another one of the groups is adapted to receive.

An ultra-wideband multi-mode true monostatic c-STAR array sub-system comprising a single array that includes at least four antenna wherein the array is adapted to utilize feed self-interference cancellation from at least one balanced circulator beam-former network (BC-BFNs).