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Finite-volume Maxwellian absorber on unstructured Grid
(2006)2006 IEEE MTT-S International Microwave Symposium DigestA novel finite-volume time-domain (FVTD) model for the Maxwellian absorber is presented to aid numerical simulations on unstructured grid. In the present approach all the electromagnetic (EM) field quantities are co-located in both space and time. Theoretical development of the co-located FVTD formulation and a practical application of the Maxwellian absorber as an unsplit perfectly matched layer (PML) for waveguide problems are presented. ...Conference Paper -
Continuous Tunable Phase Shifter Based on Injection Locked Local Oscillators at 30 GHz
(2006)2006 IEEE MTT-S International Microwave Symposium DigestInjection locking is used to achieve a continuous tunable phase shift over 280deg at 30 GHz. By locking a free running VCO at 15 GHz to an external reference source and doubling the output signal a very linear phase tuning range can be achieved. A phase noise of -117 dBc/Hz and -140 dBc/Hz at 100 KHz and 1 MHz offset frequency, respectively, have been measured. The prototype phase shifter is build on high epsiv r = 10.2 RT/Duroid substrate ...Conference Paper -
A detailed investigation of UTC traveling wave photodetectors
(2006)2006 IEEE MTT-S International Microwave Symposium DigestEffects of the absorber's thickness on the UTC TWPD's performance are investigated. This is an important parameter because it affects both external efficiency and the bandwidth of the device. The analysis of the photodetectors is done using a hybrid drift-diffusion-TLM method, which takes into consideration both, carrier dynamics and RF propagation characteristics. To improve the external efficiency of the UTC TWPD, a thicker absorber is ...Conference Paper -
An LTCC-based Wireless Transceiver with Integrated Optical Interface
(2006)2006 IEEE MTT-S International Microwave Symposium DigestThis paper describes the realization of an LTCC based optical wireless-transceiver using radio-over-fiber (RoF) techniques. For the first time, single mode optical fibers are employed, making this device particularly attractive for indoor and outdoor distributed antenna systems. The operating frequencies are in the 5-6 GHz band.Conference Paper -
Simulation and comparison of different stirrer types inside a reverberation chamber
(2004)2004 International Symposium on Electromagnetic Compatibility (EMC)In this paper the simulation of various types of electromagnetic stirrers inside a reverberation chamber is presented. Several different stirrer designs and sizes are compared against each other, and the influence of the stirrer axis orientation (vertical versus horizontal) within the chamber is shown. Three-dimensional electrical field integral equation based method of moment full-wave simulations in the frequency domain are used for the ...Conference Paper -
Treatment of arbitrary-shaped boundaries with the finite-volume time-domain (FVTD) method
(2004)Proceedings of 17th International Wroclaw Symposium on Exhibition on EMCThe use of unstructured meshes enables the Finite-Volume Time-Domain (FVTD) method to deal with arbitrarily shaped boundaries. A selection of different boundary conditions that can be applied to surfaces is presented in this paper: dielectric interfaces, ports, perfect conductors and absorbing boundaries. The successful treatment of arbitrarily shaped boundaries is proved on the basis of two examples. First, the simulation of a corrugated ...Conference Paper -
Metallic photonic crystals at RF and at optical frequencies
(2005)2005 Antennas and Propagation Society International Symposium DigestConference Paper -
Analysis and optimization of frequency selective surfaces with inhomogeneous, periodic substrates
(2007)Proceedings of the Society of Photo-Optical Instrumentation Engineers ~ Optomechatronic micro/nano devices and components IIIConference Paper -
Progress of the Finite-Volume Method in Time Domain (FVTD) and in Frequency Domain (FVFD)
(2006)Conference Paper -
Challenges and results of realistic reverberation chamber simulations and measurements
(2003)Proceedings of The 2003 Reverberation Chamber, Anechoic Chamber and OATS Users MeetingConference Paper