Photos from our climb to South Sister Mountain: http://www.everytrail.com/swf/widget.swf
In this second video of the series on beamforming, we show the time domain wave propagation for two phased array antennas at different phase differences. Thanks to the constructive and destructive interferences, the main beam of the wave is steered towards angle of interest. See also previous animation where the effect of different antenna array… Continue reading Beamforming by Phased Array Antennas
In Matlab polar plots, the default is to show the whole 360 degrees of the whole graph and also include the polar labels up to 360. If some of the labels are desired not the displayed selectively, one remedy is to replace the corresponding strings with empty string. The procedure is pretty simple and I… Continue reading Selectively Removing the Polar Axis Labels in Matlab
After using my good old Sony GPS-CS3KA for more than 5 years mainly for the GPS track logs and photo-tagging, I finally upgraded to a more functional gadget, namely the Suunto Ambit 2. While I wanted to keep the GPS logging alive, I also wanted to learn and record about my heart rate during long… Continue reading On Suunto Ambit 2 – Comparison with a Physical Altitude Post
This was my second attempt to hike up to the Mount St. Helen’s peak which is at 2526 m (8287 ft). Almost exactly 1 year after the first ascent, this time our group was only 3 people which was a big reduction compared to last year’s 8 people. Similar to our group, the parking lot… Continue reading Mount St. Helens Hike (~8287 ft)
In most of the FDTD simulations, perfectly matched layers play an indispensable role by their ability to absorb the incoming waves to mimic free space propagation. Triggering effect for this animation is the simple curiosity of what would happen if a point source was embedded in the PML rather than the inner domain. To illustrate… Continue reading What happens if the Source is Inside the PML region in FDTD simulations?
Here, the plane wave excitation using the total field / scattered field (TF/SF) formulation in finite-difference time-domain (FDTD) algorithm is demonstrated. The interface between the “total” and “scattered” field regions is shown using the square box. The plane wave polarized in the -z direction (with respect to screen surface) is injected into the medium along… Continue reading Total Field / Scattered Field (TF/SF) Implementation in FDTD