Recent propagation studies in Japan

Manabe, Tetsuya; Furuhama, Yoji

doi:10.1109/74.334916

Cited by 3 publications

(4 citation statements)

References 34 publications

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“…Fruitful research work in the area of radioclimatology and radiowave propagation is being performed also in Japan with rapid progress. In this connection, Manabe and Furuhama have published a very useful review work [17].…”

Section: A Backgroundmentioning

confidence: 99%

Neurofuzzy classification and rule generation of modes of radiowave propagation

Choudhury

Pal

2003

IEEE Trans. Antennas Propagat.

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Abstract-This paper describes, in a neurofuzzy framework, a method for the classification of different modes of radiowave propagation, followed by generation of linguistic rules justifying a decision. Weight decay during neural learning helps in imposing a structure on the network, resulting in the extraction of logical rules. Use of linguistic terms at the input enables better human interpretation of the inferred rules. The effectiveness of the system is demonstrated on radiosonde data of four different seasons in India.

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Section: A Backgroundmentioning

confidence: 99%

Neurofuzzy classification and rule generation of modes of radiowave propagation

Choudhury

Pal

2003

IEEE Trans. Antennas Propagat.

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“…[3]- [6]. However, if fast beam scanning is not required, our approach is more economical and preferable for active phased array antenna systems.…”

Section: Design Principlesmentioning

confidence: 99%

“…The antenna gain is determined by formula [9], [10] (4) where is total power supplied to the radiator subarrays. Neglecting the edge effects, we can write (5) (6) where summation in (5) is performed over all the radiator subarrays, is amplitude of signal at the input of the -th subarray in the -th row of the array, is the power corresponding to the unit amplitude of the signal supplied to the subarray, is the subarray radiation pattern corresponding to the unit amplitude of the signal at the subarray input. The summation in (6) is performed over the array quadrants and is phase on the -th quadrant:…”

Section: Antenna System Designmentioning

confidence: 99%

A new active phased array antenna for mobile direct broadcasting satellite reception

Jeon

Kim

2000

IEEE Trans. on Broadcast.

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This paper represents a new active phase array antenna for Ku-band mobile service that will be possible in satellite broadcasting service. The main idea for the antenna is to use minimum active array element with cost-effective one-dimensional subarrays with inclined pencil beam structure for 34 dBi gain. For this antenna, we also used the squint beam tracking algorithm. This tracking gives different way to the traditional monopulse tracking method in tracking capability. Electronic scanning angle of beam peak in this antenna is over 12 wide only with 20 phase shifter elements for its scan ranges. This antenna with the attractive hybrid-tracking concept has about 142 times less array element than antennas with two-dimensional array.

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“…Low-loss circular polarizers which can be inserted in the transmission path are useful, as circular polarization has been shown to suppress multipath-delayed waves [26], resulting in improved transmission characteristics. In [25], a linear-to-circular polarization con-~3 1 .…”

Section: System Com[ponentsmentioning

confidence: 99%