A Passive RF Sensor for Detecting Simultaneous Partial Discharge Signals Using Time–Frequency Analysis

Amin, Emran Md; Karmakar, Nemai Chandra

doi:10.1109/jsen.2015.2507604

Cited by 15 publications

(1 citation statement)

References 29 publications

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“…Since cavity resonator technique requires bulky and costly metallic cavity, the planar resonant sensors are preferred because of advantages such as low cost, easy fabrication and integration with other microwave circuits [11]. Designs of the planar resonant sensor are mostly based on various resonant structures such as split ring resonators (SRR) [12][13][14][15], complementary split ring resonators (CSRR) [16], substrate integrated waveguide (SIW) [17,18], slotline based RF sensor [19], stepped impedance resonator (SIR) [20], series resonators [21], fractal capacitors [22], spiral inductors [23] and interdigitated capacitor (IDC) [24]. Among these different resonant structures, the fractal capacitors, spiral inductors, IDC are easy to get fabricated on microstrip line and provide a reasonably high amount of sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Design of Rf Sensor for Simultaneous Detection of Complex Permeability and Permittivity of Unknown Sample

Porwal¹,

Azeemuddin²,

Bhimalapuram³

et al. 2017

PIER C

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Abstract-In this paper, a novel microwave planar resonant sensor is designed and developed for simultaneous detection of permittivity and permeability of an unknown sample using a nondestructive technique. It takes advantage of two-pole filter topology where the interdigitated capacitor (IDC) and spiral inductor are used for placement of a sample with significant relative permittivity and permeability values. The developed sensor model has the potential for differentiating permittivity and permeability based on the odd mode and even mode resonant frequencies. It operates in the ISM (industrial, scientific and medical) frequency band of 2.2-2.8 GHz. The sensor is designed using the full wave electromagnetic solver, HFSS 13.0, and an empirical model is developed for the accurate calculation of complex permittivity and permeability of an unknown sample in terms of shifts in the resonant frequencies and transmission coefficients (S 21 ) under loaded condition. The designed resonant sensor of size 44×24 mm 2 is fabricated on a 1.6 mm FR4 substrate and tested, and corresponding numerical model is experimentally verified for various samples (e.g., magnetite, soft cobalt steel (SAE 1018), ferrite core, rubber, plastic and wood). Experimentally, it is found that complex permeability and permittivity measurement is possible with an average error of 2%.

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