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Ashkarali P.,Center for Research in Electromagnetics and Antennas | Sreenath S.,Center for Research in Electromagnetics and Antennas | Sujith R.,Center for Research in Electromagnetics and Antennas | Dinesh R.,Center for Research in Electromagnetics and Antennas | And 2 more authors.
Microwave and Optical Technology Letters | Year: 2012

A compact asymmetric coplanar strip (ACS) fed dual-band antenna suitable for DCS/WLAN applications is presented. Dual-band operation is achieved by modifying the signal strip of the ACS monopole. Parametric studies indicate that operating frequencies of the antenna are determined by the dimensions of the strip monopole. Measurements on the optimized antenna printed on an FR4 substrate with μ r = 4.4 and height = 1.6 mm indicate good radiation characteristics with moderate gain. © 2012 Wiley Periodicals, Inc.


Tony D.,Center for Research in Electromagnetics and Antennas | Sarin V.P.,Center for Research in Electromagnetics and Antennas | Nishamol M.S.,Center for Research in Electromagnetics and Antennas | Anandan C.K.,Center for Research in Electromagnetics and Antennas | And 2 more authors.
Microwave and Optical Technology Letters | Year: 2011

A compact dual-band antenna for wireless applications is proposed. The proposed antenna provides 2:1 voltage standing wave ratio (VSWR) impedance bandwidth of 590 MHz centered at 2.6 GHz and 3.09 GHz centered at 6.19 GHz. The antenna is fabricated on a substrate of dielectric constant 4.4 and thickness 1.6 mm, occupies an area of 36.9 × 18 mm 2. Details of the proposed antenna design along with experimental and simulation results are presented. © 2011 Wiley Periodicals, Inc.


Nair S.M.,Center for Research in Electromagnetics and Antennas | Shameena V.A.,Center for Research in Electromagnetics and Antennas | Sreenath S.,Center for Research in Electromagnetics and Antennas | Mohanan P.,Center for Research in Electromagnetics and Antennas
Microwave and Optical Technology Letters | Year: 2013

A compact, wide-band slotline-fed uniplanar antenna is presented. The antenna offers a wide bandwidth from 3.8 to 10.2 GHz with a directional radiation pattern in the entire operating band. Also the antenna offers an average gain of 5 dBi in the entire band with an average efficiency of 85%. The antenna possesses an overall dimension of 21.9 × 8.8 × 1.6 mm 3 when fabricated on substrate of dielectric constant 4.4 and thickness 1.6 mm. © 2012 Wiley Periodicals, Inc.


Dinesh R.,Center for Research in Electromagnetics and Antennas | Vinod V.K.T.,Center for Research in Electromagnetics and Antennas | Anila P.V.,Center for Research in Electromagnetics and Antennas | Jithin P.,Center for Research in Electromagnetics and Antennas | And 2 more authors.
Microwave and Optical Technology Letters | Year: 2014

A novel via free, asymmetrical coplanar strip fed zeroth-order directional antenna suitable for 2.4 GHz WLAN applications is presented. The zeroth-order resonance is achieved by realizing a composite right/left-handed transmission line-based interdigital capacitor inserted into the shorted asymmetric coplanar strip. The structural asymmetry provides an improved directivity for the antenna. The prototype made on a low cost substrate of relative permittivity 3.7 and height 1.6 mm with an overall dimension 29 × 16.5 × 1.6 mm 3 offers a 2:1 VSWR impedance bandwidth of 280 MHz (2.21-2.49 GHz) and exhibits directional radiation pattern with a peak gain of 3.7 dBi over the entire operating band. © 2014 Wiley Periodicals, Inc.


Dinesh R.,Center for Research in Electromagnetics and Antennas | Vinod V.K.T.,Center for Research in Electromagnetics and Antennas | Deepak U.,Center for Research in Electromagnetics and Antennas | Vinesh P.V.,Center for Research in Electromagnetics and Antennas | Mohanan P.,Center for Research in Electromagnetics and Antennas
Microwave and Optical Technology Letters | Year: 2013

A novel composite right/left-handed (CRLH) coplanar waveguide (CPW)-fed zeroth-order resonator antenna is proposed. The shorted CRLH transmission line exhibits zeroth-order resonance at 2 GHz and operates with narrow bandwidth. The dispersion analysis is also carried out and presented in this article. The proposed antenna has been fabricated and tested. Omnidirectional radiation pattern with a gain 3.5 dBi has been obtained. Copyright © 2013 Wiley Periodicals, Inc.


Dinesh R.,Center for Research in Electromagnetics and Antennas | Vinod V.K.T.,Center for Research in Electromagnetics and Antennas | Sarin V.P.,Center for Research in Electromagnetics and Antennas | Shameena V.A.,Center for Research in Electromagnetics and Antennas | Mohanan P.,Center for Research in Electromagnetics and Antennas
Microwave and Optical Technology Letters | Year: 2013

A novel compact asymmetrical grounded coplanar waveguide-fed antenna for dual-band operation is presented. The modified asymmetric ground and slit on the radiating element provides dual band covering 2.4 and 5.2 GHz WLAN operation. A prototype of proposed antenna has been fabricated and tested. The antenna offers omnidirectional radiation pattern at 2.4 GHz and directional radiation pattern at 5.2 GHz. The peculiarity of the design is that each band can be independently tuned by varying the current paths. The antenna has an overall dimension of 26.5 × 5.7 × 1.6 mm3 when printed on a substrate of relative permittivity 4.4. © 2013 Wiley Periodicals, Inc.


Roshna T.K.,Center for Research in Electromagnetics and Antennas | Deepak U.,Center for Research in Electromagnetics and Antennas | Sujith R.,Uppsala University | Mohanan P.,Center for Research in Electromagnetics and Antennas
2014 31th URSI General Assembly and Scientific Symposium, URSI GASS 2014 | Year: 2014

This paper proposes a novel, open stub loaded high gain, asymmetric coplanar stripline antenna for IEEE 802.11a, HIPERLAN2, HiSWANa, WiMAX (IEEE 802.11e) and ISM 5.8 application bands. The proposed antenna has an overall dimension of 24×23×1.6mm3when printed on a substrate of permittivity (εr) = 4.4 and has a 2:1 VSWR bandwidth of 23% at 5.35 GHz. The antenna exhibits a peak gain of 5.20dBi at 5.35 GHz and a good omni-directional radiation with an efficiency of 84%, which are validated by measurements. © 2014 IEEE.


Deepak U.,Center for Research in Electromagnetics and Antennas | Roshna T.K.,Center for Research in Electromagnetics and Antennas | Sujith R.,Uppsala University | Mohanan P.,Center for Research in Electromagnetics and Antennas
2014 31th URSI General Assembly and Scientific Symposium, URSI GASS 2014 | Year: 2014

This paper proposes a novel compact coplanar dual band antenna for 2.4 & 5.2GHz ISM band applications. The antenna occupies an area of 25×9 mm2on an FR4 substrate of thickness 1.6mm and permittivity 4.3. A bended dipole gives the higher resonance and an SIR, electrically coupled to the dipole gives the lower resonance. The 2:1 VSWR impedance bandwidth of the proposed antenna is 90MHz for the first resonance around 2.4GHz and 2.5GHz for the second resonance. The radiation patterns are nearly omnidirectional. The maximum measured gain is 3.33dBi and 5.9dBi for 2.46GHz and 5.42GHz respectively. © 2014 IEEE.


Nishamol M.S.,Center for Research in Electromagnetics and Antennas | Aanandan C.K.,Center for Research in Electromagnetics and Antennas | Mohanan P.,Center for Research in Electromagnetics and Antennas | Vasudevan K.,Center for Research in Electromagnetics and Antennas
2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011 | Year: 2011

A varactor controlled electronically reconfigurable dual frequency microstrip antenna is presented. Dual frequency operation is realized by embedding an X-slot in a rectangular patch. High tuning ranges of 26.3% and 15.3% are realized for the two resonant frequencies respectively, when the bias voltage is varied from 0 to 16V. This design has an added advantage of size reduction up to 77% and 64% for the two resonant frequencies compared to standard rectangular patch. A maximum band width of 2.26% and 2.36% for the two frequencies with an operating frequency ratio varying in the range 1.156 to 1.279 is observed. © 2011 IEEE.

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