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Dive into the research topics where A. Lujambio is active.

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Featured researches published by A. Lujambio.


Progress in Electromagnetics Research-pier | 2013

Experimental Demonstration of Pulse Shaping for Time-Domain Microwave Breast Imaging

Adam Santorelli; Magdalena Chudzik; Evgeny Kirshin; Emily Porter; A. Lujambio; Israel Arnedo; Milica Popović; Joshua D. Schwartz

We experimentally demonstrate a low-cost hardware technique for synthesizing a speciflc electromagnetic pulse shape to improve a time-domain microwave breast imaging system. A synthesized broadband re∞ector (SBR) fllter structure is used to reshape a generic impulse to create an ad-hoc pulse with a speciflcally chosen frequency spectrum that improves the detection and imaging capabilities of our experimental system. The tailored pulse shape beneflts the system by improving the level of signal detection after transmission through the breast and thus permits higher-resolution images. We report on our ability to use this technique to detect the presence of tumours in realistic breast phantoms composed of varying quantities of glandular tissue. Additionally, we provide a set of images based on this experimental data that demonstrates the increased efiectiveness of the system using the SBR-shaped pulse in the localisation and identiflcation of the embedded tumour.


IEEE Microwave and Wireless Components Letters | 2010

A Compact Design of High-Power Spurious-Free Low-Pass Waveguide Filter

I. Arregui; Israel Arnedo; A. Lujambio; M. Chudzik; David Benito; R. Jost; F Görtz; T. Lopetegi; M. A. G. Laso

In this letter, a new technique is proposed for the design of a compact high-power low-pass rectangular waveguide filter with a wide spurious-free frequency behavior. Specifically, the new filter is intended for the suppression of the fundamental mode over a wide band in much higher power applications than the classical corrugated filter with the same frequency specifications. Moreover, the filter length is dramatically reduced when compared to alternative techniques previously considered.


IEEE Microwave and Wireless Components Letters | 2011

Dispersive Delay Line With Effective Transmission-Type Operation in Coupled-Line Technology

A. Lujambio; Israel Arnedo; M. Chudzik; I. Arregui; T. Lopetegi; M. A. G. Laso

This letter reports on a new design method for dispersive delay lines in coupled-line technology. Based on the reflective chirped delay line concept, a continuous modulation of the even- and odd-mode characteristic impedances in symmetrical coupled-lines is shown to produce a new structure that presents a flat magnitude response and a linear group-delay variation along the operation frequency band. The use of coupled-lines avoids the need for a circulator giving rise to more practical devices, where the processed signal is redirected to the coupled port instead of being reflected back to the input port, thus providing a valuable effective transmission-type operation. The technique of designing a device is validated for ultra-wideband signal processing applications.


IEEE Microwave and Wireless Components Letters | 2007

Design of Microwave Filters With Arbitrary Frequency Response Based on Digital Methods

Israel Arnedo; A. Lujambio; T. Lopetegi; M. A. G. Laso

This letter presents a novel general technique for the design of microwave filters with arbitrary frequency response. It is based on the translation of the microwave specifications to the digital domain, where the well known and readily available digital filter design techniques are applied. By means of these digital techniques, the method provides a straightforward procedure to calculate the poles and zeros corresponding to the analog frequency response that satisfies the target specifications. From the poles and zeros, the microwave filter can be readily obtained using conventional techniques. As an example to demonstrate the proposed technique, a filter with user-defined specifications over two independent passbands has been implemented and successfully tested in microstrip technology.


international conference on ultra-wideband | 2009

Arbitrary UWB pulse generation and optimun matched-filter reception

Israel Arnedo; Ivan Arregui; Magdalena Chudzik; A. Lujambio; M. A. G. Laso; Txema Lopetegi; Joshua D. Schwartz; José Azaña; David V. Plant

This paper explores a general synthesis technique previously developed by the authors for designing microwave devices with fully customized temporal/spectral responses and its communications. The theoretical foundations of the exact analytical series solution for the synthesis technique enables the passivity and stability. A simple and efficient implementation of the synthesis algorithm is also presented. Finally, we demonstrate the application of the microwave synthesis technique for UWB applications: key components for the generation and optimal demonstrated. In particular, an UWB pulse-shaper and a matched-filter are experimentally demonstrated in conventional microstrip technology.


mediterranean microwave symposium | 2013

Low loss transitions and microstrip lines on cyclo-olefin co-polymer substrate for terahertz applications

Abdallah Chahadih; Serkan Keya; Abbas Ghaddar; Tahsin Akalin; Magdalena Chudzik; Israel Arnedo; Ivan Arregui; Fernando Teberio; A. Lujambio; T. Lopetegi

We present low loss microstrip transmission line with compact transitions from coplanar waveguide for sub-terahertz applications. The microstrip (MS) transmission line is fabricated on the surface of a thin cyclic olefin copolymer dielectric layer. Among different optimization parameters, we present here the influence of CPW-to-MS transition length. Low loss transmission of the MS line has been demonstrated using Vector network analyzer (VNA) and its loss value is approximately -0.9 dB/mm. We also demonstrate that this topology is well suited for terahertz filters obtained by the combination of split rings resonators along the MS line.


Microwave and Optical Technology Letters | 2012

Analytical solution for the design of planar electromagnetic bandgap structures with spurious‐free frequency response

Israel Arnedo; Magdalena Chudzik; Joshua D. Schwartz; Ivan Arregui; A. Lujambio; Fernando Teberio; David Benito; Miguel A. G. Laso; David V. Plant; José Azaña; Txema Lopetegi


european microwave conference | 2012

Design of EBG microstrip directional coupler with high directivity and coupling

Magdalena Chudzik; Israel Arnedo; A. Lujambio; Ivan Arregui; F. Teberio; D. Benito; T. Lopetegi; M. A. G. Laso


Microwave and Optical Technology Letters | 2010

Design method for satellite output multiplexer low-pass filters exhibiting spurious-free frequency behavior and high-power operation

Ivan Arregui; Israel Arnedo; A. Lujambio; Magdalena Chudzik; M. A. G. Laso; T. Lopetegi; M. Sorolla


Signal Processing Conference (EUSIPCO), 2014 Proceedings of the 22nd European | 2014

Recent advances in software-defined radars: Chirped impulses.

José M. Muñoz-Ferreras; Israel Arnedo; A. Lujambio; Magdalena Chudzik; M. A. G. Laso; Roberto Gomez-Garcia; Arjuna Madanayake

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Israel Arnedo

Institut national de la recherche scientifique

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Israel Arnedo

Institut national de la recherche scientifique

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José Azaña

Institut national de la recherche scientifique

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