Novel synthesis technique for microwave circuits based on inverse scattering: Efficient algorithm implementation and application

Chudzik, M.; Arnedo, I.; Arregui, I.; Lujambio, A.; Laso, M.A.G.; Benito, D.; Lopetegi, T.

doi:10.1002/mmce.20500

Cited by 12 publications

(13 citation statements)

References 19 publications

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“…2) The pulse shaper: In order to form the shape of a target pulse a general synthesis technique such as the Gel'fandLevitan-Marchenko (GLM) method [7] and its efficient implementation [12] needs to be utilized over coplanar waveguide technology. The substrate is characterized by relative permitivity ε r = 11.9, substrate thickness of h = 20 μm, and metallization thickness of t = 1 μm.…”

Section: System For the Arbitrary Generation Of Radiated Terahertmentioning

confidence: 99%

Pulse shaping for millimeter-wave and terahertz applications in coplanar technology

Chudzik

Arnedo

Arregui

et al. 2014

2014 44th European Microwave Conference

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In this work, a pulse shaper in coplanar technology intended for the unlicensed band up to the THz region is designed, fabricated, and measured. This broadband frequency range is of great interests as it offers very high data rate communication in local area networks. The technique employs tailored coplanar lines that have been designed using an exact analytical series solution of the synthesis problem derived from the coupled-mode theory. The frequency response of the pulse-shaping device introduced in the synthesis method depends on the spectrum of the applied THz impulse generator, application-dependent devices (e.g. antenna) with known responses, and desired THz output response. Here, the desired output pulse is a combination of Hermite polynomials with 5 ps of temporal duration. The designed device has been simulated in the frequency domain and the obtained result of the S 11 parameter has been used in the time domain calculation of the output pulse giving good accordance with the desired THz pulse. The prototype has been fabricated with gold metallization on HR-Si substrate by e-beam lithography and lift-off process. A downscaled version with spectral content up to 0.3 THz is also fabricated and measured validating each component of the system.

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Section: System For the Arbitrary Generation Of Radiated Terahertmentioning

confidence: 99%

Pulse shaping for millimeter-wave and terahertz applications in coplanar technology

Chudzik

Arnedo

Arregui

et al. 2014

2014 44th European Microwave Conference

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“…The profile of the width of the conductive trace is directly related to its frequency response. Knowing the expected input to the microstrip and the desired output, the methods of [8][9][10] dictate the shape of the microstrip to transform the input pulse into the target.…”

Section: Pulse Shaping and The Sbr Structurementioning

confidence: 99%

“…Rather than acquiring expensive active pulse-synthesizing hardware or employing a generic microwave bandpass filter for the antenna's basic bandwidth, we noted that recent literature [8][9][10] has demonstrated the possibility to design a passive, planar microwave filter with an arbitrary frequency response, to reshape a generic impulse into a desired target pulse. The synthesis method presented in [8] provides an exact analytical solution for converting a target frequency response into a physical profile for the dimensions of a transmission line.…”

Section: Introductionmentioning

confidence: 99%

“…The synthesis technique resulted from a line of research into electromagnetic bandgap structures and is based on perturbing the physical shape of a microwave transmission line. Following the procedures developed in [8][9][10], and knowing a priori the shape of the original available impulse and the frequency response of the transmitting antenna, it is possible to determine the optimal frequency response of the microstrip line to be fabricated. We refer to this fabricated microstrip line as a synthesized broadband reflector (SBR) because the resulting filter is reflective rather than transmissive (i.e., the resulting target pulse is collected upon reflection backwards through the filter's input port).…”

Section: Introductionmentioning

confidence: 99%

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

Santorelli¹,

Chudzik²,

Kirshin³

et al. 2013

PIER

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Abstract-We experimentally demonstrate a low-cost hardware technique for synthesizing a specific electromagnetic pulse shape to improve a time-domain microwave breast imaging system. A synthesized broadband reflector (SBR) filter structure is used to reshape a generic impulse to create an ad-hoc pulse with a specifically chosen frequency spectrum that improves the detection and imaging capabilities of our experimental system. The tailored pulse shape benefits 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 effectiveness of the system using the SBR-shaped pulse in the localisation and identification of the embedded tumour.

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“…Introducing this result in (7a), 1 ( , ) is updated and a new approximation of 2 ( , ) is obtained. Iterating and taking finally into account that ( ) will be real for a physical device, we arrive at the exact analytical series solution for the coupling coefficient given in (10), shown at the end of this subsection, where = + −1 − 2 for > 1, that can be efficiently implemented with a computer, see [20]:…”

Section: General Microwave Synthesis Technique For An Arbitrary Frequmentioning

confidence: 99%

Passive Microwave Component Design Using Inverse Scattering: Theory and Applications

Arnedo

Arregui

Chudzik

et al. 2013

International Journal of Antennas and Propagation

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We briefly review different synthesis techniques for the design of passive microwave components with arbitrary frequency response, developed by our group during the last decade. We provide the theoretical foundations based on inverse scattering and coupledmode theory as well as several applications where the devices designed following those techniques have been successfully tested. The main characteristics of these synthesis methods are as follows. (a) They are direct, because it is not necessary to use lumpedelement circuit models; just the target frequency response is the starting point. (b) They are exact, as there is neither spurious bands nor degradation in the frequency response; hence, there is no bandwidth limitation. (c) They are flexible, because they are valid for any causal, stable, and passive transfer function; only inviolable physical principles must be guaranteed. A myriad of examples has been presented by our group in many different technologies for very relevant applications such as harmonic control of amplifiers, directional coupler with enhanced directivity and coupling, transmission-type dispersive delay lines for phase engineering, compact design of high-power spurious free low-pass waveguide filters for satellite payloads, pulse shapers for advanced UWB radar and communications and for novel breast cancer detection systems, transmission-type Nth-order differentiators for tunable pulse generation, and a robust filter design tool.

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Novel synthesis technique for microwave circuits based on inverse scattering: Efficient algorithm implementation and application

Cited by 12 publications

References 19 publications

Pulse shaping for millimeter-wave and terahertz applications in coplanar technology

Pulse shaping for millimeter-wave and terahertz applications in coplanar technology

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

Passive Microwave Component Design Using Inverse Scattering: Theory and Applications

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