Jagannath Malik

METAMATERIAL INSPIRED PATCH ANTENNA WITH L-SHAPE SLOT LOADED GROUND PLANE FOR DUAL BAND (WIMAX/WLAN) APPLICATIONS

Due to the integration of difierent wireless applications at difierent bands on a single device, multi-band microstrip patch antenna is the best solution keeping the overall size of the device small. In the present work, a metamaterial-inspired antenna is proposed for WiMAX/WLAN applications. Design studies, parametric analysis, simulation results along with measurements for a L-shape slotted ground microstrip patch antenna with CSRR (Complementary Split Ring Resonator) embedded on patch structure operating simultaneously at WiMAX (3.5GHz) and WLAN (5.8GHz) are presented. The metamaterial-inspired loading is exploited to create resonance for upper WLAN band while an L-shape slot on the ground plane resonates at the WiMAX band, maintaining the antennas overall small form-factor. The measured S-parameter and radiation patterns of fabricated prototype show that the proposed design is suitable for emerging WiMAX/WLAN applications.

A STACKED EQUILATERAL TRIANGULAR PATCH ANTENNA WITH SIERPINSKI GASKET FRACTAL FOR WLAN APPLICATIONS

In present work, a microstrip Sierpinski modifled and fractalized antenna using multilayer structure to achieve dual band behavior for WLAN applications has been proposed. Due to the space-fllling properties of fractal geometry, the proposed antenna is smaller in size than the conventional Euclidean-type. An equilateral triangular patch antenna with Sierpinski Gasket fractal shape has been designed and studied. An electromagnetic coupled stacked structure of two difierent patches operating at two frequencies (2.4GHz Bluetooth and 5.8GHz Wireless LAN) has been designed for dual band WLAN applications.

Novel Printed MIMO Antenna With Pattern and Polarization Diversity

In this letter, a novel compact antenna system for diversity/multiple-input-multiple-output (MIMO) application is proposed for WLAN (5.8 GHz) band with good isolation between the two input ports. The novelty of the proposed MIMO antenna system is, though the resonators are physically separated by a distance of 0.029λ ( λ is the free-space wavelength at 5.8 GHz) equal to the thickness of the substrate (1.524 mm) used for the fabrication of the antenna system, the isolation between them is enough for practical application of the antenna for MIMO. The MIMO system possesses good pattern diversity and polarization diversity with good isolation without the use of any isolation enhancement techniques. Moreover, the concept can be extended to the realization of an MIMO antenna system to operate at other frequencies with suitable scaling and optimization of geometrical parameters of the antenna topology.

A Compact Dual-Band Antenna With Omnidirectional Radiation Pattern

In this letter, a low-profile planar microstrip antenna is proposed to operate at lower WLAN (2.4 GHz) and WiMAX (3.5 GHz) frequency bands. The antenna has good omnidirectional radiation pattern for both the bands with compact form-factor. The obtained result shows that the proposed dual-band omnidirectional microstrip antenna has better impedance bandwidth and high radiation efficiency while maintaining the structural compactness. The electromagnetic model of the proposed antenna is developed in CST Microwave Studio for analysis and optimization. The fabricated antenna and measured results are presented.

Dual band microstrip patch antenna for wireless applications at 5.2 GHz and 5.8 GHz using CSSRR

This prototype antenna design was targeted for WiMAX applications at 5.2 GHz and 5.8 GHz. Patch antenna size reduction is achieved in this work. To realize a dual band operation for WiMAX application at 5.2 GHz and 5.8 GHZ, ground plane loaded with CSSRR has been proposed. The proposed antenna provides good flexibility on selection of dual frequency operation by modifying dimension of CSSRR and patch. The antenna was designed using CST V.9 simulator.

Complementary Sierpinski gasket fractal antenna for dual-band WiMAX/WLAN (3.5/5.8 GHz) applications

A proximity-fed complementary Sierpinski gasket fractal with equilateral triangular shape resonator in multilayer structure to achieve dual-band behavior for WiMAX and WLAN applications has been proposed. An electromagnetic coupled stacked structure of two different patches operating at two frequencies (3.5 GHz WiMAX and 5.8 GHz wireless LAN) has been designed for dual-band wireless applications. Proposed antenna was simulated using CST Microwave Studio based on the finite integration technique (FIT) with perfect boundary approximation (PBA). Finally, the proposed antenna was fabricated and some performance parameters were measured to validate against simulation results. The design procedures and employed tuning techniques to achieve the desired performance are presented.

Transient response of dual-band-notched ultra-wideband antenna

In the present study, an ultra-wideband (UWB) antenna has been proposed using coplanar waveguide (CPW) feed with dual-band-notch characteristics. Slot-loaded radiator and U-shaped CPW resonator are used for band rejection at 3.5 and 5–6 GHz respectively to reduce interference with existing World interoperability for microwave access and wireless local area network systems. With an extended operating band (measured at 10 dB return loss) the antenna operates successfully over the entire UWB range (3.1–10.6 GHz) with a form factor of 30 × 20 × 1.524 mm on a commercially low-cost FR-4 substrate. Experimental measurement results are presented in support of the simulated results for the proposed antenna for practical application. The antenna has been successfully fabricated and measured, showing broadband matched impedance and good omnidirectional radiation pattern throughout the operating bandwidth. Measured time-domain analysis for both the orientations, i.e. face-to-face and side-by-side, yields excellent performance in the open environment scenario. With fairly good and consistent monopole such as omnidirectional radiation patterns in H-plane and linear transmission responses, the proposed antenna is well suited to be integrated within portable devices.

A CPW fed antenna design for UWB-MIMO communication system for high isolation

A compact planar monopole ultra wide band (UWB) antenna is described with coplanar waveguide (CPW) feed for MIMO applications. The radiator and ground plane of the antenna are etched onto a piece of substrate with an overall size of 28.5mm × 42mm × 1.524mm. Implication from simulation shows that the antenna achieves a broad operating bandwidth of 3.2-10.6 GHz for a -10 dB return loss and Comb shaped DGS has significantly reduced the correlation of MIMO system. The antenna features Omni-directional radiation pattern with high radiation efficiency of 73.3% to 97.2% across ultra wide band bandwidth.

Analysis of ultra wide band dielectric resonator antenna with band notch for WLAN communication

A very simple low profile rectangular dielectric resonator antenna (DRA) is proposed in this paper. A partially printed metallic ground with two stepped section removed has been used. A stepped microstrip feed line is used to excite the DRA. The structure gives a very high bandwidth from 3.71GHz to 13.01 GHz with a band notch at 5.725 GHz. A T shape slot is used in the ground plane to create the notch at 5.725 GHz. This notch reduces the interference between UWB band and local Wi-MAX communication system.

Capacity estimation of a comapct pattern diversity MIMO antenna

Theoretical channel capacity estimation of a compact multiple-input-multiple-output (MIMO) antenna has been presented. The proposed MIMO antenna possesses excellent pattern diversity due to the orthogonal radiation maxima between the two radiators. Theoretical capacity of the proposed MIMO antenna in a Rayleigh fading channel has been calculated in MATLAB from practical scattering parameter measurements of the fabricated antenna.