Showing papers by "Girish Kumar published in 2008"
Abstract: This article proposes printed dual-band monopole antenna structures for Wireless Local Area Network (WLAN) applications in IEEE 802.11 a/b/g. The proposed antennas are fabricated on a low cost easily available FR4 substrate, which effectively covers both 2.4 and 5 GHz bands. The antenna structures are derived from an E-shape dual-band monopole antenna, which generates two separate resonant frequencies for the desired dual-band operations. The one arm resonates at the 5 GHz band, whereas the other resonates at the 2.4 GHz band. The proposed antennas can easily be fed by using a 50-Ω probe feed. The measured VSWR is <2 over the 2.4–2.5 GHz and 5.15–5.875 GHz. The radiation patterns indicate the suitability of these antennas for WLAN applications. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2483–2487, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23728
18 citations
TL;DR: In this article, the authors proposed an efficient high-gain multilayered antenna for wireless applications, which consists of a microstrip antenna which fed single or multiple parasitic patches fabricated on a low cost easily available FR4 superstrate.
Abstract: This paper proposes an efficient high-gain multilayered antenna for wireless applications. The prototype antenna consists of a microstrip antenna which fed single or multiple parasitic patches fabricated on a low cost easily available FR4 superstrate. The patches on superstrate are suspended in air at an integral multiple of λo/2. The structured is designed, fabricated and tested. The measured VSWR [lt] 2 at 5.725–5.875-GHz frequency band. The proposed antennas with single parasitic patch provide 87% efficiency, SLL of −17 dB with an associated gain of 13.5 dB. The gain increases to 17.1 dB with three parasitic patches. The proposed structure can be packaged inside an application platform. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1923–1929, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23536
13 citations
TL;DR: In this paper, a novel MEMS technology based reconfigurable dual-band monopole antenna implementing RF-MEMS switch is proposed for satellite communications applications, which is fabricated on Quartz and high receptivity silicon (HRS) using an ideal MEMS switch.
Abstract: In this study, a novel MEMS technology based reconfigurable dual band monopole antenna implementing RF-MEMS switch is proposed for satellite communications applications. The prototyped Dual band antenna is designed, fabricated, and tested. The proposed antenna is fabricated on Quartz and high receptivity silicon (HRS) using an ideal MEMS switch. The antenna structure consists of two elements—one element couples weakly to other element in OFF state while in ON state it couples strongly. This electromagnetic coupling, through a MEMS switch, gives rise to reconfigurable dual band antenna. The measured VSWR < 2 at 3.7–4.2 GHz frequency band when the switch is OFF, while in the ON state's VSWR < 2 at 5.9–6.4 GHz frequency band. The measured VSWR and radiation patterns indicate the suitability of this antenna for satellite applications. The fabricated switch exhibits an isolation of more than 40 dB while its insertion loss is <0.3 dB in the frequency range of interest. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1570–1575, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23426
11 citations
TL;DR: In this article, the authors proposed an efficient high-gain multilayer 2×2 antenna array for wireless applications, which consists of a microstrip antenna which feeds 2 ×2 array of square parasitic patches fabricated on a low-cost easily available FR4 superstrate.
Abstract: This article proposes an efficient high-gain multilayer 2×2 antenna array for wireless applications. The prototype antenna consists of a microstrip antenna which feeds 2×2 array of square parasitic patches fabricated on a low-cost easily available FR4 superstrate. The patches on superstrate are suspended in air at λ0/2. The structure is designed, fabricated, and tested. The measured VSWR is < 2 over 5.725–5.875 GHz frequency band. The proposed antenna with 2×2 array of square parasitic patches provides 80% efficiency and SLL of −24 dB with an associated gain of 14.9 dB. The proposed structure can be packaged inside an application platform. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2911–2917, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23835
9 citations