Aanandan,C K; Mohanan, P; Vasudevan, K; Shynu, S V; Gijo,Augustin(Department of Electronics, 2004)
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Abstract:
A novel design of a computer electronically reconfigurable dual frequency dual polarized single feed hexagonal slot loaded microstrip antenna in L-band is introduced in this chapter. pin diodes are used to switch the operating frequencies considerably without much affecting the radiation characteristics and gain. the antenna can work with a frequency ratio varying in the wide range from 1.2 to 1.4. the proposed design has an added advantage of size reduction up to 72.21% and 46.84% for the two resonating frequencies compared to standard rectangular patches. the design also gives considerable bandwidth of up to 2.82% and 2.42 % for the operating frequencies.
Manju,Paulson; Sona,Kundukulam O; Aanandan,C K; Mohanan, P; Vasudevan, K(Microwave and Optical Technology Letters, October 28, 2002)
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Abstract:
An arrow-shaped microstrip antenna with a pair of narrow
slots embedded near the non-radiating edges gives wide impedance bandwidth.
The experimental and simulated (!E3D) results show that antenna
bandwidth is -3.5 times that of a conventional patch with the added advantage
of reduced antenna size. The radiation characteristics are found to he uniform throughout the operating band
Mridula, S; Shameena, V A; Aanandan,C K; Mohanan, P; Vasudevan, K; Jacob, S(IEEE, September , 2011)
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Abstract:
A Coplanar waveguide fed compact planar
monopole antenna with a modified ground plane is presented.
Measured and simulated results reveal that the antenna operates
in the Ultra Wide Band with almost constant group delay
throughout the band. Developed design equations of the antenna
are validated for different substrates. Time domain performance
of the antenna is also discussed in order to assess its suitability
for impulse radio applications
Description:
General Assembly and Scientific Symposium, 2011 XXXth URSI
Dongsheng,Qi; Binhong,Li; Yabin,Zhang; Haitao,Liu(Microwave and Optical Technology Letters, February 3, 2004)
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Abstract:
A novel compact single-layer dual frequency microstrip
antenna which uses an H-shaped geometry with two U-shaped slots embedded
near the radiation edges, is presented. By changing the design parameters, the lower and higher resonant frequencies can be controlled
easily, and a range of frequency ratios (1.716-2.363) can be
obtained in this design. For the two operating frequencies of the proposed
antenna, the same polarization planes and broadside radiation
patterns are achieved. Compared to the regular dualfrequency patch
antenna, this antenna can realize a significant size reduction
Thomas, Paulbert; Gopikrishna, M; Aanandan,C K; Mohanan, P; Vasudevan, K(Wiley InterScience, October , 2010)
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Abstract:
Design of a compact microstrip-fed ultra-wideband antenna suitable for USB dongle and other such space constraint applications is presented. The structure consists of a pentagonal monopole element and a modified ground plane that gives an impedance bandwidth from 2.8 to 12 GHz. Radiation patterns are stable and omni-directional throughout the band with an average gain of 2.84 dBi. The antenna occupies only 11 × 30 mm2 on FR4 substrate with permittivity 4.4.
A compact single –feed multiband planar antenna configuration
Suitable for GPS, DCS. 2.4/5.8 GHz WLAN applications are presented.
The antenna has dimensions 38 x 3 x 1.6 mm and offers good
radiation and reflection characteristics in the above frequency bands.
The antenna has a simple geometry and can be easily fed using a 50
coaxial probe
Mohanan, P; Raj,R K; Joseph,M; Paul,B(Department of Electronics, March 17, 2000)
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Abstract:
A compact single - feed muttiband planar antenna configuration suitable
for GPS, DCS. 2.4/5.8 GHz WLAN applications is presented.
The antenna has dimensions 38 x 3 x 1.6 mm and offers good
radiation and reflection characteristics in the above frequency bands.
The antenna has a simple geometry and can be easily fed using a 50
coaxial probe.
A dual band RFID applications in 800 900
MHz and 2400 MHz band is presented. The
Asymmetric Coplanar Strip (ACS) fed antenna
consists of inverted L shaped monopole with a
capacitive loading to provide necessary impedance
matching and current distribution. The antenna has
wide bandwidth from 790 MHz tol050 MHz and
from 2350 MHz to 2640 MHz coving the RFID UHF
and Microwave frequencies. The uniplanar antenna
having overall dimensions of 48 mm x 14 mm is
printed on one side of a substrate of dielectric
constant 4.4 and height 1.6 mm.
Description:
Recent Advances in Microwave Theory and Applications, 2008. MICROWAVE 2008. International Conference on
Deepu, V; Rohith, K R; Manoj, J; Suma,M N; Vasudevan, K; Aanandan,C K; Mohanan, P(Electronics Letters, January 18, 2007)
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Abstract:
A compact dual-band uniplanar antenna for operation in the 2.4/5.2/5.8 GHz WLAN/HIPERLAN2 communication bands is presented. The dual-band antenna is obtained by modifying one of the lateral strips of a slot line, thereby producing two different current paths. The antenna occupies a very small area of 14.5times16.6 mm2 including the ground plane on a substrate having dielectric constant 4.4 and thickness 1.6 mm at 2.2 GHz. The antenna resonates with two bands from 2.2 to 2.52 GHz and from 5 to 10 GHz with good matching, good radiation characteristics and moderate gain
Binu, Paul; Mridula, S; Mohanan, P; Bijumon, P V; Sebastian,M T(Microwave and Optical Technology Letters, October 20, 2004)
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Abstract:
very-high-permittivity (e, = 100) multiband dielectrice>
e resonator antenna is presented. The compact antenna, excited by a
m:'crostrip line, resonates at two frequencies centered around the 1.9-
GHz and 2.4-GHz bands with identical polarization . The behavior of the
antenna at different positions along the feed line is studied and optimized.
Multiple resonances with the same polarization and broad radioticn
patterns suggest the suitability of the antenna for multiband wireless
application
Mohanan, P; Joseph,M; Paul,B; Raj,R K(Department of Electronics, November 11, 2004)
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Abstract:
A novel compact wideband antenna for wireless local area network
(WLAN) applications in the 2.4 GHz band is presented. The proposed
low profile antenna of dimensions 15 x 14.5 x 1.6 mm offers 18.6%
bandwidth and an average gain of -5 dBi. The antenna can be excited
directly using a 50 coaxial probe
A novel compact wideband antenna for wireless local area network
(WLAN) applications in the 2.4 GHz band are presented. The proposed
low profile antenna of dimensions 15 x 14.5 x 1.6 mm offers 18.6%
bandwidth and an average gain of~5 dBi. The antenna can be excited
directly using a 50 coaxial probe
Garcia,Garcia J; Bonache,J; Gil,I; Martin,F; Marques,R; Falcon,F; Lapetegi,T; Laso,M A G; Sorolla,M(Microwave and Optical Technology Letters, February 20, 2005)
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Abstract:
In this paper, microstrip lines magnetically coupled to splitring
resonators (SRRs) are conquved to electromagnetic bundgup (EBG)
nr,rrostrip lines in terns q/ their stop-heard penjbrnmrnce and dimensions. In
bath types o/ trunsmis•siou lines, signal propagation is inhibited in it certain
jequency bwuL For EBG microstrip lines, the central frequency of such a
forbidden band is determined by the period of the structure, whereas in
SRR-hased microstrip lines the position of the frequency gap depends on
the quasi-static resonant frequency of the rings. The main relevant conrributiun
of this paper is to provide a tuning procedure to control the gap width
in SRR microstrip lines, and to show that by using SRRs, device dimensions
ale much smaller than those required by EBGs in order to obtain similar
stop-banal performance. This has been demonstrated by fill-wave electromagnetic
simulations and experimentally verified from the characterization
ql two fabricated microstrip lines: one with rectangular SRRs etched on the
upper substrate side, and the other with a periodic perturbation cf'strip
width. For similar rejection and 1-(;H,. gap width centered at 4.5 Gllz, it
has been found that the SRR microstrip line is•,fve times shorter. In addition,
no ripple is appreciable in the allowed band for the .SRR-hared structure,
whereas due to dispersion, certain mismatch is expected in the EBG
prototype. Due to the high-frequency selectivity, controllable gap width, and
small dimensions, it is believed that SRR coupled to planar transmission
lines can have an actual impact on the design of stop-band filters compatible
with planar technology, and can be an alternative to present solutions based on distributed approaches or EBG
Shavit,R; Taig,I(Microwave and Optical Technology Letters, July 20, 2004)
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Abstract:
In this paper, a comparison study among three neuralnetwork
algorithms for the synthesis of array patterns is presented. The
neural networks are used to estimate the array elements' excitations for
an arbitrary pattern. The architecture of the neural networks is discussed
and simulation results are presented. Two new neural networks,
based on radial basis functions (RBFs) and wavelet neural networks
(WNNs), are introduced. The proposed networks offer a more efficient
synthesis procedure, as compared to other available techniques
Biju Kumar, S; Honey, John; Rani, Joseph; Hajian,M; Ligthart, L P; Mathew, K T(Elsevier Science, 2001)
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Abstract:
Dielectric properties of polyaniline at different frequencies were studied. Cavity perturbation technique was employed for the
study. Poly aniline in the powder and pelletised forms were prepared under different environmental conditions. Different samples of
poly aniline exhibit high conductivity. However. the conductivity of samples prepared under different environmental conditions is
found to vary. All the samples in the powder form have high conductivity irrespective of the method of preparation. The high
conductivity at microwave frequency makes it possible to be used for developing microwave components like filters.
Conducting polymers are excellent microwave absorbers
and they show technological advantage when compared
with inorganic electromagnetic absorbing materials,
being light weight , easily processable, and the ability
of changing the electromagnetic properties with nature
and amount of dopants, synthesis conditions, etc. In this
paper we report the synthesis, dielectric properties, and
expected application of conducting composites based
on polyaniline (PAN). Cyclohexanone soluble conducting
PAN composites of microwave conductivity 12.5 S/m
was synthesized by the in situ polymerization of aniline
in the presence of emulsion grade polyvinyl chloride. The
dielectric properties of the composites, especially the
dielectric loss, conductivity, dielectric heating coefficient
, absorption coefficient, and penetration depth,
were studied using a HP8510 vector network analyzer.
The microwave absorption of the composites were studied
at different frequency bands i.e, S, C, and X bands
(2-12 GHz). The absorption coefficient was found to be
higher than 200 m -' and it can be used for making microwave
absorbers in space applications
The recent boom in wireless communication industry, especially in the area of cellular
telephony and wireless data communication, has led to the increased demand for multi
band antennas. In such applications the issues to be addressed are, wide bandwidth and
gain, while striving for miniature geometry.
A dual frequency configuration useful in GSM1800 and Blue tooth, is one that operates
with similar properties, both in terms of reflection and radiation characteristics, in the two
bands of interest. Dual frequency operations can be realized by exciting the Microstrip
Patch Antenna (MPA) using a single feed [1] or dual feed [2].
In this paper, Conformal FDTD[3] method with Perfect Magnetic Conductor (PMC)
applied along the plane of symmetry [4] is used to study the characteristics of an
Octagonal MPA. The theoretical results are compared against the experimental and
IE3D™ simulated results
Description:
Antennas and Propagation Society International Symposium, 2007 IEEE,PP 5259-5262
Pravinkumar,P A; Mohanan, P; K G Nair(Indian Journal of Radio & Space Physics, December , 1981)
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Abstract:
A technique for improving the coupling between a feed horn and reflector by using corrugated metallic flanges is presented.
Experimental data for flanges of varying parameters are given and theoretical explanation is supplemented
This paper presents the design and
development of a compact CPW fed quad band
antenna. This low profile antenna has a dimension
of 32mmx31mm when printed on a substrate of
dielectric constant 4.4 and height 1.6mm. The
antenna covers GSM 900, DCS 1800,
IEEE802.11.a, IEEE802.11.b and HiperLAN2
bands. The antenna exhibits good radiation
characteristics with moderate gain
Shynu, S V; Augustin, G; Aanandan,C K; Mohanan, P; Vasudevan, K(IET, March 16, 2006)
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Abstract:
A new electronically reconfigurable dual frequency microstrip patch antenna with highly simplified varactor tuning circuitry is presented. The proposed design allows relatively independent selection of the two operating frequencies. Tuning ranges of 7.1 and 4.1% are realised for the two resonant frequencies without the use of any matching circuits.