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Multiband MIMO antennas
Published in Yadwinder Kumar, Shrivishal Tripathi, Balwinder Raj, Multifunctional MIMO Antennas, 2022
Harsh Verdhan Singh, D. Venkata Siva Prasad, Shrivishal Tripathi
The defected ground structure (DGS) comprises the slots or defects incorporated on the ground plane of antennas or planar circuits [28]. It is a popular method for refining numerous considerations of MIMO antennas, including narrow cross-polarization, bandwidth, tuning frequency, decoupling improvement, outline, multiband operation, and low gain [29, 30]. Additionally, this method considerably improves isolation. However, the back radiation may also be enhanced. The DGS tunes the ground plane surface currents, and may act as a band-stop filter and suppress the coupling between the nearby elements.
Performance improvement of H-Shaped antenna with Zener diode for textile applications
Published in The Journal of The Textile Institute, 2022
The micro-strip patch antenna's (MSPA) miniaturization expands its applicability for connectivity in a variety of ways. MSPA may also be used for wireless body area networks (WBAN) and include equipment for tracking systems in military, security, and medical applications, thanks to the usage of lightweight plastic in their fabrication. The advancement of new wearable mobile devices necessitates the use of antennas that are smaller in size and internally compact to match. In these systems, devices developed especially for the industrial scientific medical (ISM) band are used for connectivity. Defected ground structure (DGS) is an emerging strategy for enhancing different microwave circuit parameters such as narrow bandwidth, cross-polarization, low gain, and so on. The concept of a compact MSPA utilizing various versatile substrate materials and DGS to resonate the antenna at 2.45 GHz ISM array, which can be used as biomedical sensors, is suggested in this article (Ding et al., 2017; Fakhte et al., 2014; Ahmad Mashaal et al., 2013; Pourahmadazar & Rafii, 2012; Tran & Park, 2016).
A Filtering Antenna Based on Etched Interdigital Structure for Dual-Band High Selectivity
Published in IETE Journal of Research, 2021
Xiaokun Yang, Ding Zhao, Zhengping Zhang
DGS (Defected Ground Structure) was widely dedicated to the frequency selectivity in microwave projects because it provides a sharp, distinct electromagnetic band-gap and large slow wave factor, resulting a size reduction in integrated antennas, which is highly fitted for designing a filtering antenna. Complying with the RF laws, there is a general conclusion that larger electromagnetic (EM) structures will operate efficiently in the lower resonant band. On the contrary, the smaller an element is the higher band a device will work in [17]. A comparison between variant dimensions of the proposed interdigital structure is conducted whose results can be seen in Figure 4. From the transmission coefficients (S21) simulated and plotted by software HFSS and origin, respectively, the RF laws mentioned previously can be verified. Meanwhile, there is an exception coloured with red, as shown in Figure 4, when the etched interdigital structure is twice the standard size (listed in Table 1), there will appear two resonant gaps because besides the interdigital structure, an inner split resonant ring and centre stub will form an extra resonant structure working in a relatively high band.