Journal Articles

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Browsing Journal Articles by Author "Chaturvedi, Divya"

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    A triangular-shaped quarter-mode substrate integrated waveguide based antenna for WBAN applications
    (Defense Scientific Information and Documentation Centre, 2018-03-13) Chaturvedi, Divya; Raghavan, S
    In this study, a compact quarter-mode substrate integrated waveguide (QMSIW) based dual-band antenna is proposed for wireless body area network applications. A QMSIW resonator is realised by splitting the full-mode substrate integrated waveguide cavity along the perfect magnetic conductor walls. The proposed antenna preserves the fundamental mode TE1I5 and the third order mode TE.Q of the square SIW cavity. The proposed antenna is linearly polarised in the lower band at 2.45 GHz and circularly polarised in the higher frequency band at 5.8 GHz. The on-body performance of the antenna is validated on a piece of pork muscle tissue and it has been found to be stable with respect to surroundings. The proposed antenna covers the ISM bands 44 MHz (2.445 GHz-2.489 GHz) and 225 MHz (5.730 GHz-5~955 GHz) at 2.45 GHz and 5.8 GHz, respectively. The measured gain of the antenna on pork tissue is 1.87 dBi and 5.5 dBi at two bands. In addition, the specific absorption rate is obtained of 0.65 m\V g and 1.51 mW/g at two bands (it∗ = 2 mm), averaged over 1 g of muscle with lOOmW input power. Moreover, the simulated and experimental results demonstrate a good agreement. © 2018, DESIDOC.
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    Compact QMSIW based antennas for WLAN/WBAN applications
    (Electromagnetics Academy, 2018-03-28) Chaturvedi, Divya; Raghavan, Singaravelu
    In this paper, two compact planar substrate integrated waveguide (SIW) cavity-backed antennas are proposed for wireless local area network (WLAN) at 5.5GHz and wireless body area network (WBAN) at 5.8GHz. The miniaturization is achieved with the concept of quarter-modetopology, and the size of the cavity is reduced up to one-fourth of the circular SIW cavity. A L-shaped slot is etched on the top plane for miniaturization, and antenna-1 is realized which resonates at 5.5GHz. A metal strip has been added in the middle section of the slot, and antenna-2 is realized, which resonates at 5.8GHz. Both proposed antennas are tested in free space, while the performance of antenna-2 is investigated for on-body condition. In free space, the measured impedance bandwidths of the antenna are 160 MHz and 210MHz at 5.5 GHz and 5.8GHz, respectively. The radiation efficiency of the antenna is 89.4% in free space and 57% on phantom at 5.8GHz. Both measured and simulated results are observed, and they are in a good agreement.