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Author

Usha Kiran Kommuri

Bio: Usha Kiran Kommuri is an academic researcher from VIT University. The author has contributed to research in topics: Antenna (radio) & Radiation pattern. The author has an hindex of 6, co-authored 20 publications receiving 112 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, an ultra-wideband circular cross slot artificial magnetic conductor (CCS-AMC) based low profile ultra wideband (UWB) antenna is designed and implemented.
Abstract: In this article, an ultra-wideband circular cross slot artificial magnetic conductor (CCS-AMC) based low profile ultra-wideband (UWB) antenna is designed and implemented. Reflection phase bandwidth (±90°) of 63.47% (5.7 to 11.0) GHz is achieved using the proposed CCS-AMC. Integration of CCS-AMC with UWB antenna improves the radiation pattern and gain for entire UWB range. Impedance bandwidth of 129.41% (2.4 to 11.2) GHz is achieved for the final prototype. In order to verify the concept, a UWB antenna with a compact size of (0.31 × 0.31 × 0.1) λo, (λo is the wavelength corresponding to the lowest operating frequency at 3.1 GHz) is fabricated and experimentally validated with CCS-AMC. Average gain improvement of 3.5 dBi (3–10.5 GHz) and a peak gain of 8.5 dBi at 8 GHz are obtained. Miniaturized structure with high gain makes this prototype a better candidate, especially for outdoor UWB application.

30 citations

Journal ArticleDOI
TL;DR: In this article, a metal-to-metal contact based miniaturized low voltage triangular MEMS switch with improved characteristics such as low actuation voltage, high isolation, low insertion loss, low stress factor, and good return loss is presented.

27 citations

Journal ArticleDOI
TL;DR: In this paper, the proposed E-plane spiro meander line uniplanar compact electromagnetic bandgap (E-SMLUC-EBG) structure was applied in mutual coupling reduction of a dual-element MIMO antenna system for WLAN.
Abstract: This paper presents designs of novel E-plane spiro meander line uniplanar compact electromagnetic bandgap (E-SMLUC-EBG) and H-plane spiro meander line uniplanar compact electromagnetic bandgap (H-SMLUC-EBG) structures. The proposed EBG has been applied in mutual coupling reduction of a dual-element multiple input multiple output (MIMO) antenna system for WLAN by placing an EBG structure between the radiating antennas. Compact size of EBG helps in reducing the edge to edge distance between antennas which is 0.14λ0 in this case, and it increases the compactness of integrated circuit. It gives 19 dB and 11 dB simulated mutual coupling reduction in E-plane and Hplane respectively at 5.8 GHz. Measured isolation improvement of 20.3 dB for E-plane and 14.7 dB for H-plane has been achieved. This coupling reduction is also confirmed by surface current and correlation coefficient plots. The four-element (2×2) MIMO antenna system with proposed EBG is also simulated.

26 citations

Journal ArticleDOI
TL;DR: A triangular complementary split ring resonator (TCSRR) based compact metamaterial antenna for multiband operation is presented and has good radiation pattern for both E-plane and H-plane in all the desired frequencies.
Abstract: In this paper, a triangular complementary split ring resonator (TCSRR) based compact metamaterial antenna for multiband operation is presented. TCSRR is used to achieve a compact antenna structure. The proposed antenna consists of a trapezoidal radiating patch with partial ground plane and loaded TCSRR. The trapezoidal radiating patch is responsible for lower and higher frequencies, wherein the two inner resonance frequencies are obtained by loading TCSRR structure. The negative permittivity characteristics of the TCSRR structure are demonstrated through waveguide setup method. The proposed antenna with compact size of 25 × 25 × 1.6 mm3 is developed and tested. The measured and simulated results are good in agreement with each other and it covers 2.4/5.2 GHz (WLAN), 2.5 GHz (WiMAX), 7.4 GHz (X-band downlink) and 8.2 GHz (ITU band) simultaneously. The proposed antenna design has good radiation pattern for both E-plane and H-plane in all the desired frequencies.

18 citations


Cited by
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Journal ArticleDOI
TL;DR: The need for flexible antennas, materials, and processes used for fabricating the antennas, various material properties influencing antenna performance, and specific biomedical applications accompanied by the design considerations are focused on.
Abstract: The field of flexible antennas is witnessing an exponential growth due to the demand for wearable devices, Internet of Things (IoT) framework, point of care devices, personalized medicine platform, 5G technology, wireless sensor networks, and communication devices with a smaller form factor to name a few. The choice of non-rigid antennas is application specific and depends on the type of substrate, materials used, processing techniques, antenna performance, and the surrounding environment. There are numerous design innovations, new materials and material properties, intriguing fabrication methods, and niche applications. This review article focuses on the need for flexible antennas, materials, and processes used for fabricating the antennas, various material properties influencing antenna performance, and specific biomedical applications accompanied by the design considerations. After a comprehensive treatment of the above-mentioned topics, the article will focus on inherent challenges and future prospects of flexible antennas. Finally, an insight into the application of flexible antenna on future wireless solutions is discussed.

101 citations

Book ChapterDOI
01 Jan 2005
Abstract: Design and technology is an inspiring, rigorous and practical subject. Using creativity and imagination, pupils design and make products that solve real and relevant problems within a variety of contexts, considering their own and others’ needs, wants and values. They acquire a broad range of subject knowledge and draw on disciplines such as mathematics, science, engineering, computing and art. Pupils learn how to take risks, becoming resourceful, innovative, enterprising and capable citizens. Through the evaluation of past and present design and technology, they develop a critical understanding of its impact on daily life and the wider world. High-quality design and technology education makes an essential contribution to the creativity, culture, wealth and well-being of the nation.

95 citations

Journal ArticleDOI
TL;DR: In this paper, an efficient T-shaped decoupling network is proposed to decouple closely spaced two-element E-plane antenna array based on network analysis and implementation deduction, which is extended to a three-element one by combining with a fine transmission line and further generalized to a multielement linear one.
Abstract: Strong mutual coupling between both adjacent and nonadjacent elements is unavoidable, especially when antenna array is densely arranged. In this paper, an efficient T-shaped decoupling network is primarily proposed to decouple closely spaced two-element E-plane antenna array based on network analysis and implementation deduction. Subsequently, it is extended to a three-element one by combining with a fine transmission line and further generalized to a multielement linear one. All the accordant simulation and measurement results demonstrate that as compared to the coupled arrays, impedance matching, radiation patterns, and scanning characteristics of the decoupled arrays are evidently improved through adding the decoupling network, while mutual coupling between every two elements is greatly reduced. Moreover, such combined decoupling network is effective in the H-plane array and monopole antenna array, implying its huge potential for large-scale array and various arrays.

83 citations

Journal ArticleDOI
TL;DR: The performance comparison of the proposed flexible antenna with the state-of-the-art flexible antennas in terms of compactness, frequency reconfigurability, and number of operating bands demonstrates the novelty ofThe proposed antenna and its potential application in heterogeneous applications.
Abstract: This paper presents a compact frequency reconfigurable antenna for flexible devices and conformal surfaces. The antenna consists of a simple easy to fabricate structure consisting of a stub loaded circular radiator, designed on commercially available RT5880 flexible substrate ( $\varepsilon _{\mathrm {r}} = 2.2$ ) with a thickness of 0.254 mm. The combination of stub loading and slot etching techniques are utilized to achieve the advantages of compactness, frequency reconfigurability, wide impedance bandwidth, and stable radiation pattern with structural conformability. The frequency reconfigurability is achieved by employing two p-i-n diodes. Simulated and experimental results showed that the antenna operates in various important commercial bands, such as S-band (2 GHz– 4 GHz), Wi-Max (3.5 GHz and 5.8 GHz), Wi-Fi (3.6 GHz, 5 GHz, and 5.9 GHz), 5G sub-6-GHz (3.5 GHz and 4.4 GHz – 5 GHz), and ITU-band (7.725 GHz – 8.5 GHz) with the additional advantages of structural conformability. Furthermore, the performance comparison of the proposed flexible antenna with the state-of-the-art flexible antennas in terms of compactness, frequency reconfigurability, and number of operating bands demonstrates the novelty of the proposed antenna and its potential application in heterogeneous applications.

51 citations

Journal ArticleDOI
TL;DR: Simulation and experimental results indicate proper antenna operation with linear polarization in the 2.45 GHz band and circular polarizationIn the 1.575 GHz band, with realized gain of 1.94 dBi and 1.98 dBic.
Abstract: A wearable textile antenna with dual-band and dual-sense characteristics is presented in this work. It operates at the 2.45 GHz band for WBAN and WLAN applications, and at the 1.575 GHz band for Global Positioning System (GPS) applications. An antenna backing based on an artificial magnetic conductor (AMC) plane operating at 2.45 GHz band is introduced to reduce the backward radiation and to improve antenna gain. It consists of a $3\times 3$ array of square patch unit cells, where each unit cell is integrated with four square slits and a square ring. A square-shaped patch is then located on top of the substrate as its radiator. To enable dual-band operation, two corners of this radiator are truncated, with each of the four corners incorporated with a rectangular slit to enable its circular polarization characteristic in the GPS band. Simulation and experimental results are in good agreement and indicate proper antenna operation with linear polarization in the 2.45 GHz band and circular polarization in the 1.575 GHz band, with realized gain of 1.94 dBi and 1.98 dBic, respectively.

44 citations