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Model.ng.of doubl. ridg. wav.g.ide using.ANN

Frontiers of El.ctrical.and El.ctronic Eng.neering.in China 2012年第3期7卷 299-307页

作者： j. l.kshmi narayana k. sri rama krishna l. pratap reddy g. v. subrahmanyam Department of El.ctronics & Communication Eng.neering St. Ann'sCollege of Engineering and Technology Chirala A.E India

The ridg. wav.g.ide is useful.in v.rious microwav. appl.cations because it can be operated at a l.wer frequency and has l.wer impedance and a wider mode separation than a simpl. rectang.l.r wav.g.ide. An accurate model.is essential.for the anal.sis and desig. of ridg. wav.g.ide that can be obtained using.el.ctromag. netic simul.tions. Howev.r, the el.ctromag.etic simul.- tion is expensiv. for its hig. computational.cost. Therefore, artificial.neural.network. （ANNs） become v.ry useful.especial.y when sev.ral.model.ev.l.ations are required during.desig. and optimization. Recentl., ANNs hav. been used for sol.ing.a wide v.riety of radio frequency （RF） and microwav. computer-aided desig. （CAD） probl.ms. Anal.sis and desig. of a doubl. ridg. wav.g.ide has been presented in this paper using.ANN forward and inv.rse model.. For the anal.sis, a simpl. ANN forward model.is used where the inputs are g.ometrical.parameters and the outputs are el.ctrical.parameters. For the desig. of RF and microwav. components, an inv.rse model.is used where the inputs are el.ctrical.parameters and the outputs are g.ometrical.parameters. This paper al.o presents a comparison of the direct inv.rse model.and the proposed inv.rse model.

关键词： ridg. wav.g.ide radio frequency (RF),computer-aided desig. (CAD) artificial.neural.network.ANN) forward and inv.rse model.

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Artificial.neural.network.approach for anal.zing.mutual.coupl.ng.in a rectang.l.r MIMO antenna

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Frontiers of El.ctrical.and El.ctronic Eng.neering.in China 2012年第3期7卷 293-298页

作者： k. sri rama krishna k. j.g.DEESH BABU j. l.kshmi narayana l. pratap reddy g. v. subrahmanyam Department of El.ctronics and Communication Eng.neering VRSiddhartha Engineering College Vijayawada India k. j.g.DEESH BABU J. LAKSHMI NARAYANADepartment of Electronics and Communication Engineering St. Ann'sCollege of Engineering and Technology Chirala India Department of El.ctronics and Communication Eng.neering JNTUCollege of Engineering Hyderabad India Department of El.ctronics and Communication Eng.neering AcharyaNagarjuna University Guntur India

A wideband rectang.l.r patch antenna resonat- ing.at 3.5 g.z and 8 g.z frequencies is dev.l.ped on a fl.xibl. substrate, which can be used for wearabl. appl.cations. The proposed antenna g.v.s a wide impe- dance bandwidth of 116%, operating.from *** to 9.5 g.z, cov.ring.most of the ul.ra-wideband （UWB） operating.frequency rang.. A two-el.ment mul.ipl.-input mul.ipl.-output （MIMO） system is dev.l.ped using.the proposed antenna, and the mutual.coupl.ng.between the two antennas for v.rious separations and frequencies is anal.zed by using.artificial.neural.network. （ANNs）. The neural.structure is trained by using.different ANN al.orithms and a comparativ. study is made between them. It is shown that, quasi-Newton （QN） and quasi- Newton mul.i l.yer perceptron （QN-Ml.） al.orithms are better in terms of training. testing.errors, and correl.tion coefficient.

关键词： fl.xibl. substrate mul.ipl. input mul.ipl.output (MIMO) systems artificial.neural.network. (ANNs) mutual.coupl.ng impedance bandwidth

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