New compact interferometer based on fractal concept

Silva, C. P. N.; Oliveira, E. M. F. de; Oliveira, Mayara; Melo, M. T. de; Oliveira, B. G. M. de

doi:10.1109/imoc.2015.7369200

Cited by 8 publications

(9 citation statements)

References 4 publications

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“…Figure shows the bandwidths of the proposed 16 sub‐bands, as well as the frequency ranges with its respective binary words. These sub‐bands have different bandwidths as seen in Refs . When a system provides a digital binary word equal to “0010”, for example, it means that the frequency of the input signal is in the second sub‐band of the system, in a frequency range between 3.55 GHz and 3.85 GHz, consequently with a bandwidth of 0.3 GHz.…”

Section: Simulation and Experimental Resultsmentioning

confidence: 99%

“…These sub-bands have different bandwidths as seen in Refs. 5,6 When a system provides a digital binary word equal to "0010", for example, it means that the frequency of the input signal is in the second sub-band of the system, in a frequency range between 3.55 GHz and 3.85 GHz, consequently with a bandwidth of 0.3 GHz. Table 2 shows the pros and cons of this approach.…”

Section: Simulation and Experimental Resultsmentioning

confidence: 99%

“…The output of the horn antennas is connected to microwave detectors, which are responsible for converting the signal amplitude to DC voltage levels. The V TH in the detectors is chosen for each FSS to provide the respective bits and can have different values as seen in Refs . If the V TH and transition bands are chosen correctly, the digital output will be a set of n bits, and the system will be able to identify 2n different sub‐bands.…”

Section: Instantaneous Frequency Measurement Systemmentioning

confidence: 99%

“…A variety of FD designs for use in IFM systems has been presented in the literature, for example, as an interferometer in a low‐cost IFM system presented in Ref., as a Subsystem Based on Multi‐Band‐Stop Filters presented in Ref . and as a compact interferometer based on fractal concept presented in Ref …”

Section: Introductionmentioning

confidence: 99%

“…5 and as a compact interferometer based on fractal concept presented in Ref. 6 In this paper, an alternative setup is proposed for the IFM systems, employing frequency selective surfaces (FSSs) and ultra-wideband (UWB) antennas. FSS can be described as an infinite two-dimensional periodic array of patch/slot elements.…”

Section: Introductionmentioning

confidence: 99%

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Four‐bit instantaneous frequency measurement systems based on frequency selective surfaces

Pinheiro

Oliveira

Filho

et al. 2018

Micro & Optical Tech Letters

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This paper presents four frequency selective surfaces (FSSs) to be used in an instantaneous frequency measurement (IFM) systems. The FSS based on simple dipoles have a frequency response corresponding to the characteristics of frequency discriminators. An IFM system with 4‐bits is shown with resolution around 300 MHz. The system contains 16 distinct frequency sub‐bands between 3.21 and 8.75 GHz. CST software simulations and measurements of insertion loss are presented and compared with theoretical results to provide the binary codes of the system.

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Section: Simulation and Experimental Resultsmentioning

confidence: 99%

Section: Simulation and Experimental Resultsmentioning

confidence: 99%

Section: Instantaneous Frequency Measurement Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Four‐bit instantaneous frequency measurement systems based on frequency selective surfaces

Pinheiro

Oliveira

Filho

et al. 2018

Micro & Optical Tech Letters

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Compact fractal interferometers for a 4‐bit IFM system

Silva

Machado

Oliveira

et al. 2017

Micro & Optical Tech Letters

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Instantaneous frequency measurement (IFM) systems have been developed during the last decades, and new designs came across trying to keep the system as compact as possible. In this paper, the authors present compact interferometers based on Hilbert fractal geometry for a 4‐bit IFM system. The interferometers operate in the range 4.66–6.38 GHz, using a Wilkinson power divider connected to two microstrip lines, which one of these is the Hilbert fractal curve. The design and simulations to be presented were done in a full wave EM simulator. Measured and simulating results are presented and compared. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:1153–1157, 2017

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Multi-band microwave sensor based on Hilbert’s fractal for dielectric solid material characterization

Silva

Araújo

Coutinho

et al. 2020

Journal of Electromagnetic Waves and Applications

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A planar sensor designed using the fourth Hilbert fractal curve iteration for solid material characterization at multiple frequencies is reported in this paper. The fractal curve is self-similar with space filling properties. The Hilbert fractal geometry is used to form a compact resonator, with a multiband frequency response where miniaturization is achieved, since a large transmission line length is effectively confined in a limited area. The sensor provides five resonances in the frequency range from 0 to 5 GHz. The resonant frequencies are 0.56, 1.68, 2.72, 3.69 and 4.72 GHz, all used to measure the real permittivity of known samples with a sensitivity of 7, 20, 27, 43 and 50 MHz/permittivity, respectively. The sensor is used to measure dielectric samples with 20 x 20 mm 2 areas with several thicknesses. Simulations and measurements demonstrate that the Hilbert fractal geometry can be used to design a multiband planar sensor for solid dielectric material characterization.

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New compact interferometer based on fractal concept

Cited by 8 publications

References 4 publications

Four‐bit instantaneous frequency measurement systems based on frequency selective surfaces

Four‐bit instantaneous frequency measurement systems based on frequency selective surfaces

Compact fractal interferometers for a 4‐bit IFM system

Multi-band microwave sensor based on Hilbert’s fractal for dielectric solid material characterization

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