Poly-Harmonic Distortion Model Extraction in Charge-Controlled One-Port Devices

A charge-controlled, one-port device is used to describe and discuss the extraction procedure of a Poly-Harmonic Distortion (PHD) model in detail. For this case, both voltage and current waveforms are shown to be enough to fully characterize the PHD model. It is also shown that all the information specifically required for this PHD model definition can be stored in the Fourier coefficients of the incremental conductance and capacitance. The results are validated by comparing them with those obtained using a commercial circuit simulation tool.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Equivalent Circuit Modelling of Non-Symmetric Reciprocal Lossy Electromagnetic Structures

Lattice-network-based equivalent circuits of lossy symmetric reciprocal electromagnetic structures have shown superior performance when compared to other topologies like the T- or PI- networks. This is due to the realizability of their elements and the orthogonal-mode decomposition, which, in most cases, provides a deep physical insight into the behaviour of the modelled structure. The aim of this contribution is to provide a short description of these equivalent circuits and to compare their performances by modelling a misaligned complementary strip-slot element.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech. Marie Sklodowska-Curie grant agreement No 706334. Spanish Ministerio de Economía y Competitividad and the European Regional Development Funds under Grants TEC2016-76070-CR3-2-R and TEC2016-76070-CR3-3-R (ADDMATE)

On the Phase Response and Radiation Efficiency of the Complementary Strip-Slot as an Array Element

The complementary strip-slot element is a broadlymatched microstrip radiator that has been used to design innovative series-fed arrays. It consists of a microstrip series-fed slot that have its complementary stub on the layer of the microstrip and aligned to the slot. In this contribution, the influence of the strip and slot geometry on its performance is studied through the analysis of four different designs. The obtained results highlight the possibility of controlling the radiation efficiency or the phase response, without compromising the broad matching. Therefore, potential series-fed arrays built with this element can exploit this feature to set the magnitude and phase of the excitations with certain flexibility.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech. This work was supported by the Spanish Ministerio de Ciencia e Innovaci ´on (Programa Consolider-Ingenio 2010) under Grant CSD2008-00066, EME

Obtaining quasi-static models using a frequency domain extraction methodology

© 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.”This contribution illustrates how a realistic nonlinear quasi-static model for FET-type devices can be extracted using an original frequency domain extraction technique. An ideal ‘made-up’ device is built from the measured bias dependence of a GaN medium power device. This ideal device is excited by two ideal voltage sources and its response (drain current) is used to illustrate how the extraction procedure can separate conduction and displacement current components provided the total current spectrum (or, alternatively, waveform) and control voltages are known.This work has been supported by the Junta de Andalucía under Grant (TIC2012-1237). Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Caracterización no-lineal de dispositivos de un puerto basada en el principio de distorsión poli-armónica

In this contribution the computation of a nonlinear diode model based on the Poly-Harmonic Distortion principle is described. The diode is composed of a non-linear conductance shunt connected to a non-linear capacitance, both of them quasistatic. The procedure used to extract these parameters only requires port-voltage and -current waveforms. The computed parameters of the model at different frequencies and power levels are presented and have been validated by comparing them with those obtained using a commercial circuit simulation tool (specifically with X-parameters). Unlike commercial CAD tools or conventional measurement set-ups the proposed technique can easily provide all the sensitivities related to DC components.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Consideraciones sobre el amplificador distribuido como amplificador de potencia

In this contribution, a short review of independent research activities on distributed power amplification is presented. An analysis of the intrinsic limitations of distributed power amplifiers serves as a guideline to present some solutions available in the literature. This analysis shows that a distributed amplifier can work as an optimum class-A power combiner for a discrete set of frequency values determined by the selected active devices, and the phase shift and characteristic impedances between stages. The solutions proposed over the years present several circuital configurations that offer different options for the distribution of the available gain-bandwidth product, which are briefly reviewed in this contribution.Este trabajo ha sido financiado por el Ministerio de Ciencia e Innovación (Programa Consolider-Ingenio 2010) en el marco del proyecto CSD2008-00066 (’EMET’-Engineering Metamaterials) y por la Junta de Andalucía por medio del proyecto P10-TIC-6883

Design Aspects of a Broadband Beam-Reconfigurable Leaky-Wave Antenna

Design aspects of a novel beam-reconfigurable pla-nar series-fed array are addressed to achieve beam steering with frequency tunability over a relatively broad bandwidth. The design is possible thanks to the use of the complementary strip-slot, which is an innovative broadly matched microstrip radiator, and the careful selection of the phase shifter parameters.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Circuito equivalente del strip-slot complementario como red asimétrica con pérdidas

The complementary strip-slot can be successfully modeled by means of a lattice equivalent circuit, with realizable immittances. In the case of the misaligned complementary stripslot, useful in series fed arrays, the lattice network is not applicable because of its asymmetry. There are few approaches in the technical literature for that problem, i.e., an equivalent circuit for an asymmetric lossy network. One of the few proposals was made by Felsen and Oliner in 1954. The aim of this communication is to use that equivalent circuit for the characterization of some misaligned strip-slot structures, and to provide some basic conclusions.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Modelling asymmetric two-port reciprocal microwave structures by means of compact equivalent circuits

Effective microwave systems design requires powerful and reliable modeling techniques. Today modern CAD tools provide such support from device physics to circuit level or from electromagnetics to system level. Nevertheless, affordable and handy tools capable of providing a first approach on the evaluation of the main parameters that govern system performance are required in the first stage of almost any design. The authors have extensive experience in the design of reconfigurable Leaky Wave Antennas (LWAs) for microwave applications, and an essential tool in their design procedure has been the use of compact equivalent circuits for the radiators that constitute these antennas [1]. In previous works, lattice-network based equivalent circuits have demonstrated to be extremely useful to perform parametric studies or preliminary performance estimation of such LWAs, by means of fully or quasi-analytical calculations. Latticenetwork equivalent circuits also have interesting features such as their guaranteed realizability and the orthogonal mode decomposition, which facilitates the physical insight into the modelled structure.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech. European Union’s Horizon 2020 Research and Innovation Programme under the Marie Sklodowska-Curie Grant Agreement No. 706334. Spanish Ministerio de Economía y Competitividad and the European Regional Development Funds under Grants ADDMATE TEC2016-76070-CR3-2-R and -3-R (AEI/FEDER, UE)

Disipación de potencia en redes en celosía: la radiación del strip-slot complementario

A circuit property of symmetrical lattice networks is derived and applied to the analysis of symmetrical twoport electromagnetic structures. This property is related to the independence of the power dissipation in the series and cross impedances of the lattice network and the consequent independence in the power dissipated under even and odd excitation in the twoport structure. Its utility is illustrated with its application to a planar radiating element, the so-called complementary strip-slot. This property allows identifying the cause of the losses in the analysed example and explains the radiation origin.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech