Design of target support columns using EPS foam

Suspended Ring Resonator for Dielectric Constant Measurement of Foams

“…Results of the measurement are shown in Table II. The data match well with the theoretical prediction of Knott, which was confirmed by slotted waveguide and swept frequency measurements reported in [8].…”

“…Early data on scattering-based foam measurements as well as two simple theory models have been discussed by Plonus [6] and Knott [7]. Knott's model for lowdensity foam samples was confirmed by recent measurements reported in [8]. A recent quasi-optical study of terahertz properties of foams was reported in [9] and [10].…”

“…The propagation constant in (3) is then modified by adding (6) The network representation of the two parallel ring-halves is found by converting the scattering parameters of the two ring halves to admittance parameters then adding the resulting matrices to yield the admittance matrix of the entire ring (7) where is the characteristic impedance of the ring microstrip found from [13]. This admittance matrix is then converted to the transmission parameter representation to yield (8) The transmission matrices of the left gap, ring, and right gap are multiplied to yield the transmission matrix of the system (9) The scattering parameter is then calculated from the system transmission matrix as (10) where is the characteristic impedance of the measurement system; is normally 50 . Using (10), the scattering parameter can be calculated for the system in Fig.…”

Radiated emission field perturbations due to accessories used in the FAR environment at 2, 10 & 18 GHz

“…In [7], Berrie & Wilson clearly demonstrate that EPS can be used as a mechanical and structural material by showing a 9000 pound scale model of an aircraft supported by only five columns of that (nearly) un-perturbing material. If EPS is suitable as support structures for such a heavy objects as they describe, it seems suitable for supporting ITE products.…”

“…If EPS is suitable as support structures for such a heavy objects as they describe, it seems suitable for supporting ITE products. Their recent article [7] gives many helpful material properties such as stress vs strain curves and tables of epsilon values for different density EPS formulations. Even shape was discussed vis-a-vis minimizing EM field perturbations.…”