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Conference Presentations by Nagabhushana Hm

Research paper thumbnail of Slotted and Miniaturized Patch Antenna for WLAN and WiMAX Applications

— The properties of Microstrip patch antennas such as low profile, easy fabrication, less cost an... more — The properties of Microstrip patch antennas such as low profile, easy fabrication, less cost and conformability well suited and popularly used in wireless devices. A small slotted dual band microstrip patch antenna for wireless applications is presented in this paper. The IEEE operating bands 2.4/5.2 GHz wireless local area network (WLAN)/ worldwide interoperability for microwave access (WiMAX) are covered by this proposed antenna. The antenna can be fed by direct probe feeding using a 50 ohm microstrip line. The parametric analysis such as return loss, directivity, bandwidth, gain and VSWR of micorstrip patch antenna with meandered slots are analyzed using high frequency structure simulator (HFSS). Measured return loss and radiation patterns are observed to be omnidirectional, moderate gain and dual band frequencies suitable for mobile handsets. The overall size of the antenna is 15mm×25mm×1.6mm, fabricated on flame resistant-4 epoxy (FR4) substrate of dielectric constant 4.4. The antenna provides two useful impedance bands with good efficiency. The antenna size reduction is more than 60%. The first band resonates at 2.4 GHz with return loss of-19.79 dB. Hence first band finds application in WLAN. The second band resonance is at 5.2 GHz with return loss of-28.97 dB. WiMAX uses this band. The operation of the antenna is compared along with measured and simulated results. Good validation has been found in measured results and simulated results.

Papers by Nagabhushana Hm

Research paper thumbnail of A Novel S Shaped Wide Band Patch Antenna with Split Ground for Digital Multimedia Broadcasting and LTE

International Journal of Engineering Development and Research, 2017

— A simple and miniaturized S shaped wide band microstrip patch antenna is presented and measured... more — A simple and miniaturized S shaped wide band microstrip patch antenna is presented and measured in this paper. Antenna is developed using a FR4 epoxy (dielectric constant = 4.4) substrate on a Split or partial ground. The proposed antenna has a wide band response and useful in wireless and other applications. The antenna can be used in Digital multimedia broadcasting DMB (frequency range: 2.58 GHz – 2.88 GHz) as well as LTE 2500 MHz. The presented 'S' shaped antenna has been designed, simulated and measured using high frequency structural simulator (HFSS) v15 Software and microwave antenna testing unit. The results are attractive with VSWR< 2 for the required frequencies. The wide band can be seen from 3.38 GHz to 7.3 GHz which can be useful for WLAN/WiMAX etc. The Return loss and radiation patterns are observed to be omnidirectional with moderate gain. Reduction in size of the antenna is obtained by taking slots in the patch and split or partial ground concept. The overall reduction in size of the antenna is around 70%. The simulated and measured results show that the antenna is suitable for DMB, LTE, WLAN, WiMax and satellite uplink applications. The dimension of the proposed antenna is 30 mm×34 mm×1.6 mm. Index Terms— Wireless, 'S' shaped, Split Ground, Long Term Evolution (LTE), Digital Multimedia Broadcasting (DMB), FR4 epoxy. ________________________________________________________________________________________________________ I. INTRODUCTION The Microstrip patch antennas are the most widely used antennas in various wireless applications because of their low cost and ease of fabrication [1]. In recent years, extensive research activities are being dedicated towards the development of multiband and wide band antennas for wireless and other related applications [1-12]. A simple design of wide band microstrip patch antenna for Digital multimedia Broadcasting DMB applications as well as LTE, WLAN, WiMax and satellite uplink etc has been proposed in this paper. The proposed antenna covers all the 5.2/5.8 GHz WLAN/WiMAX IEEE operating bands. The antenna can be fed by direct feeding using a 50 ohm microstrip line. The Proposed antenna has been designed and various parameters such as return loss, directivity, bandwidth, gain and VSWR of microstrip patch antenna with slots are analyzed through high frequency structure simulator (HFSS) Software. HFSS (High frequency Structure simulator) [13] works on the principle of FIT (Finite Integration Technique). The proposed wide band microstrip patch antenna with 'S' shape structure is presented by the way of simple slot configuration that can be applied as a printed antenna. The proposed antenna has improved band width, return loss, gain and polarization characteristics having dual band. The first band applied for Digital multimedia Broadcasting DMB with a bandwidth of 302 MHz having frequency range of 2.58 GHz – 2.88 GHz and LTE 2500 MHz. The second band is a wide band which ranges from 3.38 GHz – 7.3 GHz for mobile applications like WLAN/WiMAX etc. The considered frequency ranges have return loss below-10db. The antenna design has been verified using Ansoft HFSS software [13]. II. PROPOSED ANTENNA DESIGN The basic structure of rectangular microstrip patch antenna with split ground build on a substrate FR4 (Flame resistant-4) Epoxy having a dielectric constant of 4.4 is shown in figure 1. The feed to the antenna is given by a 50 Ω microstrip line. Partial ground [14] concept is used here to improve the impedance matching of the antenna ranging from 3.4 GHz to 4.1GHz. The simulation results of return loss V/s frequency shown in figure 2 indicate the impedance bandwidth of 700 MHz. The modification from the basic rectangular patch antenna to obtain 'S' shaped antenna to meet the desired specified frequency bands such as 2.58 GHz to 2.88 GHz with peak resonant frequency at 2.69 GHz with return loss of-23.80 dB and 3.38 GHz to 7.3 GHz with peak resonance at 6.11 GHz with return loss of-21.3 dB. The proposed 'S' shaped antenna structure is as shown in figure 3 which consists of a radiating patch, dielectric substrate and a ground plane. The patch and the ground planes have conducting material such as copper. We are using low cost substrate such as FR4 (Flame resistant-4) Epoxy having a dielectric constant of 4.4. The feeding to the patch antenna is a microstrip line and a split ground plane is on the other side of the substrate. Figure 4 shows proposed geometry of the split ground plane of the antenna with complete dimensions.

Research paper thumbnail of Slotted and Miniaturized Patch Antenna for WLAN and WiMAX Applications

— The properties of Microstrip patch antennas such as low profile, easy fabrication, less cost an... more — The properties of Microstrip patch antennas such as low profile, easy fabrication, less cost and conformability well suited and popularly used in wireless devices. A small slotted dual band microstrip patch antenna for wireless applications is presented in this paper. The IEEE operating bands 2.4/5.2 GHz wireless local area network (WLAN)/ worldwide interoperability for microwave access (WiMAX) are covered by this proposed antenna. The antenna can be fed by direct probe feeding using a 50 ohm microstrip line. The parametric analysis such as return loss, directivity, bandwidth, gain and VSWR of micorstrip patch antenna with meandered slots are analyzed using high frequency structure simulator (HFSS). Measured return loss and radiation patterns are observed to be omnidirectional, moderate gain and dual band frequencies suitable for mobile handsets. The overall size of the antenna is 15mm×25mm×1.6mm, fabricated on flame resistant-4 epoxy (FR4) substrate of dielectric constant 4.4. The antenna provides two useful impedance bands with good efficiency. The antenna size reduction is more than 60%. The first band resonates at 2.4 GHz with return loss of-19.79 dB. Hence first band finds application in WLAN. The second band resonance is at 5.2 GHz with return loss of-28.97 dB. WiMAX uses this band. The operation of the antenna is compared along with measured and simulated results. Good validation has been found in measured results and simulated results.

Research paper thumbnail of A Novel S Shaped Wide Band Patch Antenna with Split Ground for Digital Multimedia Broadcasting and LTE

International Journal of Engineering Development and Research, 2017

— A simple and miniaturized S shaped wide band microstrip patch antenna is presented and measured... more — A simple and miniaturized S shaped wide band microstrip patch antenna is presented and measured in this paper. Antenna is developed using a FR4 epoxy (dielectric constant = 4.4) substrate on a Split or partial ground. The proposed antenna has a wide band response and useful in wireless and other applications. The antenna can be used in Digital multimedia broadcasting DMB (frequency range: 2.58 GHz – 2.88 GHz) as well as LTE 2500 MHz. The presented 'S' shaped antenna has been designed, simulated and measured using high frequency structural simulator (HFSS) v15 Software and microwave antenna testing unit. The results are attractive with VSWR< 2 for the required frequencies. The wide band can be seen from 3.38 GHz to 7.3 GHz which can be useful for WLAN/WiMAX etc. The Return loss and radiation patterns are observed to be omnidirectional with moderate gain. Reduction in size of the antenna is obtained by taking slots in the patch and split or partial ground concept. The overall reduction in size of the antenna is around 70%. The simulated and measured results show that the antenna is suitable for DMB, LTE, WLAN, WiMax and satellite uplink applications. The dimension of the proposed antenna is 30 mm×34 mm×1.6 mm. Index Terms— Wireless, 'S' shaped, Split Ground, Long Term Evolution (LTE), Digital Multimedia Broadcasting (DMB), FR4 epoxy. ________________________________________________________________________________________________________ I. INTRODUCTION The Microstrip patch antennas are the most widely used antennas in various wireless applications because of their low cost and ease of fabrication [1]. In recent years, extensive research activities are being dedicated towards the development of multiband and wide band antennas for wireless and other related applications [1-12]. A simple design of wide band microstrip patch antenna for Digital multimedia Broadcasting DMB applications as well as LTE, WLAN, WiMax and satellite uplink etc has been proposed in this paper. The proposed antenna covers all the 5.2/5.8 GHz WLAN/WiMAX IEEE operating bands. The antenna can be fed by direct feeding using a 50 ohm microstrip line. The Proposed antenna has been designed and various parameters such as return loss, directivity, bandwidth, gain and VSWR of microstrip patch antenna with slots are analyzed through high frequency structure simulator (HFSS) Software. HFSS (High frequency Structure simulator) [13] works on the principle of FIT (Finite Integration Technique). The proposed wide band microstrip patch antenna with 'S' shape structure is presented by the way of simple slot configuration that can be applied as a printed antenna. The proposed antenna has improved band width, return loss, gain and polarization characteristics having dual band. The first band applied for Digital multimedia Broadcasting DMB with a bandwidth of 302 MHz having frequency range of 2.58 GHz – 2.88 GHz and LTE 2500 MHz. The second band is a wide band which ranges from 3.38 GHz – 7.3 GHz for mobile applications like WLAN/WiMAX etc. The considered frequency ranges have return loss below-10db. The antenna design has been verified using Ansoft HFSS software [13]. II. PROPOSED ANTENNA DESIGN The basic structure of rectangular microstrip patch antenna with split ground build on a substrate FR4 (Flame resistant-4) Epoxy having a dielectric constant of 4.4 is shown in figure 1. The feed to the antenna is given by a 50 Ω microstrip line. Partial ground [14] concept is used here to improve the impedance matching of the antenna ranging from 3.4 GHz to 4.1GHz. The simulation results of return loss V/s frequency shown in figure 2 indicate the impedance bandwidth of 700 MHz. The modification from the basic rectangular patch antenna to obtain 'S' shaped antenna to meet the desired specified frequency bands such as 2.58 GHz to 2.88 GHz with peak resonant frequency at 2.69 GHz with return loss of-23.80 dB and 3.38 GHz to 7.3 GHz with peak resonance at 6.11 GHz with return loss of-21.3 dB. The proposed 'S' shaped antenna structure is as shown in figure 3 which consists of a radiating patch, dielectric substrate and a ground plane. The patch and the ground planes have conducting material such as copper. We are using low cost substrate such as FR4 (Flame resistant-4) Epoxy having a dielectric constant of 4.4. The feeding to the patch antenna is a microstrip line and a split ground plane is on the other side of the substrate. Figure 4 shows proposed geometry of the split ground plane of the antenna with complete dimensions.