Hyunkieu,Yang; Sangseol,Lee(Microwave and Optical Technology Letters, December 5, 2001)
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Abstract:
The cutoff wavenumbers of higher order modes in circular
eccentric guides are computed with the variational analysis combined
with a conformal mapping. A conformal mapping is applied to the
variational formulation, and the variational equation is solved by the
finite-element method. Numerical results for TE and TM cutoff
wavenumbers are presented for different distances between the centers
and ratio of the radii. Comparisons with numerical results found in the
literature validate the presented method
Lethakumary,B; Sreedevi, Menon K; Priya,Francis; Aanandan,C K; Mohanan, P(Microwave and Optical Technology Letters, January 20, 2005)
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Abstract:
In this paper, we introduce a novel feeding technique for
bandwidth enhancement of a rectangular microstrip antenna This antenna
offers an impedance bandwidth of 22% without degrading the effciencv.
The effect of the feed parameters upon patch characteristics
such as resonant frequency, impedance bandwidth, and radiation pattern are studied in detail. The experimental results are verified using the
FDTD results
Sreedevi, Menon K; Lethakumary,B; Mohanan, P; Bijumon, P V; Sebastian,M T(Microwave and Optical Technology Letters, August 20, 2004)
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Abstract:
A broadband cylindrical dielectric resonator antenna
(DRA) energized with an L-strip feed is presented The novel exciting
technique achieves a 2:1 VSWR bandwidth of 18%. The variation of
bandwidth for different feed parameters is also studied
The design and development of an L-band printed dipole antenna.
optimized for wide-band applications near first resonance, is reported.
This design has achieved more than 48% impedance bandwidth
(VSWR 2:1), without degrading its overall radiation efficiency
Lethakumary,B; Sreedevi, Menon K; Aanandan,C K; Mohanan, P(Microwave and Optical Technology Letters, April 5, 2003)
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Abstract:
An electromagnetically coupled T-shaped microstrip feed
used to enhance the impedance bandwidth of a rectangular microstrip
antenna is reported. The proposed antenna offers a 2:1 VSWR bandwidth
of -36% with an increase in gain of 0.8 dB
Mathew, K T; Stephen,D S; Aanandan,C K; Mohanan, P; K G Nair(Department of Electronics, May 12, 1994)
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Abstract:
A trapezoidal strip grating surface that eliminates specular
reflections almost over the entire X -band frequency range for TM
polarization is reported This new grating structure overcomes the
bandwidth limitation of conventional rectangular strip grating surfaces