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RADIO SCIENCE, VOL. 38, NO. 4, 1074, doi:10.1029/2001RS002575, 2003

Radiation efficiency analysis of submillimeter-wave receivers based on a modified spectral domain integration technique

Thomas Vaupel

Chair of Electromagnetic Theory, University of Wuppertal, Wuppertal, Germany


Volkert Hansen

Chair of Electromagnetic Theory, University of Wuppertal, Wuppertal, Germany


Frank Schäfer

Max-Planck Institute for Radioastronomy, Bonn, Germany


Abstract

Reflector backed submillimeter-wave slot antennas on substrate lenses are promising candidates for novel astronomical applications in integrated receivers for the far infrared region. Using an adjustable reflector, considerable resonance frequency tuning can be achieved, but with the risk of exciting parasitic parallel plate wave modes. Employing a surface/volume integral equation method and advanced spectral domain integration techniques, a complete radiation efficiency analysis of such kind of receivers is performed. Convenient integration path deformations in complex wavenumber planes allow a very fast evaluation of the spectral domain integrals in combination with efficient database and asymptotic extraction techniques. Saddle point and residue calculation techniques are employed to accurately determine the power of each parallel plate mode and the space wave contributions. The simulations reveal an appropriate set of parameters reducing the radiation loss to less than 10 percent for doubleslot and quadratic slot geometries preserving high tuning capability and optimized radiation patterns as well.

Received 26 November 2001; accepted 15 May 2003; published 9 August 2003.

Index Terms: 0604 Electromagnetics: Antenna arrays; 0644 Electromagnetics: Numerical methods; 0624 Electromagnetics: Guided waves; 0679 Electromagnetics: Singularity expansion method.

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Citation: Vaupel, T., V. Hansen, and F. Schäfer (2003), Radiation efficiency analysis of submillimeter-wave receivers based on a modified spectral domain integration technique, Radio Sci., 38(4), 1074, doi:10.1029/2001RS002575.