Vaneet Pathak

Mobile handset system performance comparison of a linearly polarized GPS internal antenna with a circularly polarized antenna

There is a popular believe that the GPS antenna has to be right hand circularly polarized (RHCP). But, the circularly polarized signal is susceptible to deformation in the presence of multi-path environment. With the integration of GPS functionality in consumer products, especially in mobile handsets, chances are, the consumers are going to use these GPS-enabled devices mostly in an urban environment. And multi-path is omnipresent in these environments. Linearly polarized (LP) signal is less susceptible to distortions from surrounding environment. Therefore, a low profile, omni-directional linearly polarized antenna was developed. The number is satellites tracked, and the number of satellites used for navigation purposes were observed. The Carrier to Noise Ratio in dBHz was evaluated for each satellite used. The measurement results for both antennas in realistic environments will be presented.

Propagation-prediction and site-planning software for wireless communication systems

Propagation-prediction and site-planning software for wireless communication networks has been developed. The software has a user-friendly graphical user interface (GUI), and provides calculations for large-scale and small-scale propagation parameters, including path loss (or received power) and delay profiles. Angles of arrival/departure, which are useful for the design of wireless systems employing multiple antennas, are also provided in the simulation. Some of the main features of the software include the use of a computationally efficient ray-tracing approach for simulating propagation in wireless environments, and the fact that users can upload AutoCAD .dxf files for indoor or outdoor environments. Both a single-building floor plan or an entire city layout can be simulated, and the user is provided with the ability to assign wall geometries and electrical parameters. User-defined realistic antenna radiation patterns for both the transmitting and receiving antennas are incorporated in the simulation. Broadband as well as polarization-dependent simulations are also included in the software.

Composite Right-Left Handed Metamaterial ultra-wideband antenna

In this paper, two novel ultra-wideband (UWB) antenna designs based on Composite Right-Left Handed (CRLH) Metamaterial (MTM) structures are elaborated. With CRLH MTM technology embedded, the proposed UWB antenna designs present best in class radiation bandwidth, efficiency, radiation pattern and polarization. All great figures of merits have been achieved based on ultra compact sized PCB antenna structures with convenient integration solution.

Compact dual-band planar metamaterial antenna arrays for wireless LAN

The paper presents two examples of compact antenna arrays for MIMO applications which were designed based on MTM technologytrade. These multi-band antenna arrays occupy smaller volume than the conventional antennas while they provide equal or better performances. These antennas in addition to the excellent performance can be easily integrated with any PCB based circuit, thus significantly reducing the cost in the mass production. The compact antenna arrays can enable advanced MIMO solutions like switched arrays and beamforming arrays which can provide diversity gains in addition to MIMO gain.

Internal antenna diversity for mobile phones at 850MHz

Antenna diversity and mobile phones seem to be two opposed concepts as diversity requires decoupling between the sensors and mobile phones are getting smaller and smaller. But in order to cope with high data throughput and network saturation, it is necessary to develop antennas which allow to be placed in close proximity with a reduced coupling. This article presents a solution where three 850MHz antennas have been implemented inside a flip phone with a maximum coupling of -15dB.