D. J. Hoppe

TPF coronagraph instrument design (2005)

Shaklan, S. B., Balasubramanian, K., Ceperly, D., Green, J. J., Hoppe, D. J., Lay, O. P., ...

NASA

A Hybrid Symmetric FEM/MOM Formulation Applied to Scattering by Inhomogeneous Bodies of Revolution (2004)

Hoppe, D. J., Epp, L. W., Lee, J-F.

A new symmetric formulation of the Hybrid Finite Element Method (HFEM) is described which combines elements of the Electric Field Integral Equation (EFIE) and the Magnetic Field Integral Equation...

Scattering from the Quasi-Optical Ferrite Circulator Using a Coupled Integral Equation/FEM Solution (2004)

Epp, L. W., Hoppe, D. J., Chinn, G. C., Lee, J.

Ferrite materials are used in microwave devices that exploit the property of Faraday rotation to give non-reciprocal behavior. Examples of common waveguide components that use ferrite materials...

High Power Amplifier Harmonic Output Level Measurement (2004)

Perez, R.M., Hoppe, D.J., Khan, A.R.

A method is presented for the measurement of the harmonic output power of high power klystron amplifiers, involving coherent hemispherical radiation pattern measurements of the radiated klystron...

Phase Locking of a Second Harmonic Gyrotron Using a Quasi-Optical Circulator (2004)

Hoppe, D.J., Perez, R.M., Bhanji, A.M., Guo, H.Z., Rogers, J., Tate, J.P.

The benefits of high power millimeter wave radiation for use in communication and radar systems are well known. Recently a frequency near 35 GHz was allotted for use in deep space communications,...

Radiation from Axisymmetric Waveguide Fed Horns (2004)

Chinn, G.C., Hoppe, D.J., Epp, L.W.

Return losses and radiation patterns for axisymmetric waveguide fed horns are calculated with the finite element method (FEM) in conjunction with the method of moments (MoM) and the mode matching...

A Hybrid Finite Element Method for Axisymmetric Waveguide fed Horns (2004)

Chinn, G. C., Hoppe, D. J., Epp, L. W.

A new method for finding radiation patterns and the reflection coefficients associated with an axisymmetric waveguide fed horn is presented. The approach is based on a hybrid finite element method...

Application of a large space-based diffractive optical element telescope to the Terrestrial Planet-Finder Mission: design and tolerance issues (2004)

Baron, R. L., Hoppe, D. J., Cwik, T. A.

An analytical description of the scattered light from a 10 meter diameter Diffractive Optical Element lens-based telescope operating at 1 micron wavelength has been formulated.