Abstract: An air interface plane (AIP) of a radio frequency (RF) aperture includes: a circuit board having a first side and a second side opposite the first side; and a matrix of tapered elements arranged on the first side of the circuit board and secured to the circuit board, the matrix of tapered elements cooperating to at least one of receive or transmit an over-the-air RF signal. Suitably, each tapered element of the matrix has: a central hub extending along a longitudinal axis from a hub base which is proximate to the first side of the circuit board to an apex of the tapered element which is distal from the first side of the first circuit board; and a plurality of arms extending from the central hub at the apex of the tapered element, each of the plurality of arms including a first portion that projects the arm radially away from the longitudinal axis and a second portion that projects the arm longitudinally toward the first side of the circuit board.

Abstract: A keyboard system for an electronic pocket calculator or the like comprising an insulative substrate board having a plurality of recesses formed therein and a plurality of switch actuating elements (e.g., disks), one for each recess. The board is provided with switch contacts at each of the recesses including an outer contact on one face of the board bordering each of the recesses and an inner contact within each recess and terminals at a margin of the board for electrical interconnection to other electronic components. Each of the disks is resiliently deformable between an initial position in which its outer margin is in contact with the outer contact and in which it is clear of the inner contact and an actuated position in which the outer margin of the disk remains in contact with the outer contact and in which one point of the disk is in contact with the inner contact thereby to complete a circuit between the inner and outer contacts.