Abstract: An antenna includes an elongate dielectric strip having opposing first and second sides. A first conductive pattern defines a first radiating element for a first frequency range on the first side of the elongate dielectric strip. A second conductive pattern defines a second radiating element for a second frequency range on the first side of the elongate dielectric strip. The second frequency range is different than the first frequency range. A diplexer circuit is on the elongate dielectric strip between said first and second radiating elements and coupled thereto. A third conductive pattern defines a shared ground plane for the first and second radiating elements on the second side of the elongate dielectric strip.

Abstract: Antenna system includes first and second quadrifilar radiating elements. A first one of the quadrifilar radiating elements (QRE) is comprised of a plurality of first bifilar helical loops (BHLs). The BHLs are oriented in a mutual orthogonal relationship on a common axis. A second QRE shares a common feed structure with the first QRE. The second QRE comprises a plurality of second BHLs oriented in a mutual orthogonal relationship on the common axis. The first QRE is tuned for operation in a first frequency band, the second QRE is tuned for operation in a second frequency band different from the first frequency band.

Abstract: Systems (100) and methods (700) for customizing a cryptographic algorithm. The methods comprise: providing an electronic device with the cryptographic algorithm implementing a permutation function ƒ configured to produce a first keystream using bits input thereto, the permutation function ƒ comprising a round function ƒround consisting of a mixing layer in which input bits are combined together; and customizing the mixing layer of the permutation function ƒ while the electronic device is in the field. The mixing layer is customized by: receiving, by the electronic device, a first user-software interaction for entering a first bit string comprising a plurality of first arbitrary bits; breaking the first bit string into a plurality of equal length segments each comprising only a portion of the plurality of first bits; and translating each of the equal length segments into irreducible polynomial coefficients and/or an irreducible polynomial identifier.

Abstract: Systems (100) and methods (600) for enabling communications between a Private Network Resource (“PNR”) and a first Radio Network Resource (“RNR”). The methods comprise: performing first operations by the PNR to generate a first packet with a header including a first Private Address (“PA”) for the PNR and a first Effective PA (“EPA”) for the first RNR; communicating the first packet from the PNR to a second RNR via first private network; performing second operations at the second RNR to parse the first PA and the first RNR from the first packet's header, and translate the first PA into a first Radio Address (“RA”) and the first EPA into a second RA; generating a second packet by modifying the first packet's header to include the first and second RAs; and communicating the second packet to the first RNR via radio network.

Abstract: A radio system includes a portable radio and at least one elongate mounting rail having spaced apart indentations therein. At least one sliding mount includes a mount body having a passageway therethrough and slidably receiving a corresponding elongate mounting rail. The mount body is coupled to the portable radio. At least one spring plunger is carried by the mount body and configured to engage at least one adjacent indentation in the elongate mounting rail.