Difference of break-point characteristics due to mobile antenna heights in microwave urban LOS propagation

Masui, Hironari; Ishii, Masanori; Takahashi, Satoshi; Shimizu, Hiroyuki; Kobayashi, T.

doi:10.1109/izsbc.2000.829255

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…The influence of this scattering at short ranges in the measurements taken tends to decrease the over all path loss as opposed to the common breakpoint seen in cellular systems 5 , where at antenna heights of a few to tens of meters as the distance is increased the angle of each ground bounce ray approaches ninety degrees from the surface normal, providing more complete cancellation at longer distances and a decay to a fourth power law trend. Here at least at the short distances observed the predominance of large scatterers at a higher elevation than either the transmit or receive antennas can increase the received signal over that expected from the two ray model.…”

Section: Path Loss At Antenna Heights Of Five Centimetersmentioning

confidence: 93%

“…Prior to the explosive growth of cellular communications most studies of propagation above 1GHz focused on point-to-point satellite or similar line of sight links. Recently a large number of papers have appeared quantifying propagation fall off and multi-path in cellular systems 4,5 . These studies generally directed toward wireless phone providers focus on the base-station to mobile link at distance of at least a few hundred meters with most considering frequencies below 2 GHz.…”

Section: Theory Of Short Range Wireless Propagationmentioning

confidence: 99%

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Pico Wireless Integrated Network Sensors (PicoWINS): Investigating the Feasibility of Wireless Tactical Tags

Merrill¹,

Sohrabi²,

Pottie³

et al. 2002

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The public reporting burden for this collection of information is estimated to average 1 hou,r per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collectior of information, including suggestions for reducing the burden, This report documents the results of the PicoWINS investigation of the feasibility of tactical tags as a landmine replacementsystemSpecifically it provides a description of a tag prototype system, and of the design issues required to create a viable low power, autonomous wireless sensor system. Focus within this analysis was given to the radio frequency propagation limits for tag operation, including tag-to-tag links, tag-to-gateway links, and tag-to-munition links for homing ammunition. Within this context, a full propagation study as a function of height, range, and frequency was conducted in nineteen outdoor environments. Also explored were algorithms for locating the tags, and for optimizing the individual tags communication range. Each of the system components needed to create a tactical tag system are explored in detail, with focus given to the electromagnetic limitations imposed by the propagation environment, tag size, and tag power.

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Section: Path Loss At Antenna Heights Of Five Centimetersmentioning

confidence: 93%

Section: Theory Of Short Range Wireless Propagationmentioning

confidence: 99%

Pico Wireless Integrated Network Sensors (PicoWINS): Investigating the Feasibility of Wireless Tactical Tags

Merrill¹,

Sohrabi²,

Pottie³

et al. 2002

View full text Add to dashboard Cite

show abstract

“…We have previously performed propagation experiments assuming low base-station antenna height, that is, microcells in an urban area, and have reported their results [3], [4]. In this study, we measured microwave path-loss characteristics in an urban area in Japan within an environment where base-station antenna height is sufficiently higher than that of peripheral buildings.…”

Section: Introductionmentioning

confidence: 99%

Microwave path-loss characteristics in an urban area with base station antenna on top of a tall building

Sakawa¹,

Masui²,

Ishii³

et al.

2002 International Zurich Seminar on Broadband Communications Access - Transmission - Networking (Cat. No.02TH8599)

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Much research has been reported on the microwave band as a powerful means of achieving 4th-generation mobile communications systems. The focus of this research, however, has been propagation characteristics under the assumption of low antenna height for base stations in a microcell environment. This paper, in contrast, clarifies microwave path-loss characteristics in an environment where the height of the transmitting base-station antenna is higher than that of surrounding buildings. Path-loss characteristics (attenuation coefficient, corner loss, relative loss, and standard deviation) in a non-line-of-sight (NLOS) environment with high antenna height were found to be quite different than those of a conventional low-antenna-height environment. This is because the propagation mechanism of primary waves is significantly altered by the change in antenna height. It was found, in particular, that rooftop diffracted waves come to dominate in a high-antenna-height, NLOS environment.

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Broadband antenna for GSM, UMTS and LTE Wi-Max applications

Abbak

Akduman

2010

2010 10th Mediterranean Microwave Symposium

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Difference of break-point characteristics due to mobile antenna heights in microwave urban LOS propagation

Cited by 3 publications

References 7 publications

Pico Wireless Integrated Network Sensors (PicoWINS): Investigating the Feasibility of Wireless Tactical Tags

Pico Wireless Integrated Network Sensors (PicoWINS): Investigating the Feasibility of Wireless Tactical Tags

Microwave path-loss characteristics in an urban area with base station antenna on top of a tall building

Broadband antenna for GSM, UMTS and LTE Wi-Max applications

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