Progress report Smart antennas in wireless communications by Ivan Arkhipov cs603 Wireless Communications & Networks Instructor: Dr. Ajay Gupta

Smart antenna systems combine multiple antenna elements with a signal-processing capability to optimize its radiation and/or reception pattern automatically in response to the signal environment (International Engineering Consortium (n.d.)). Definition The basic idea is get bigger beam in a direction towards the user

In my approach I am trying to filter useful signal from a space to get bigger gain (or SNR) and to change the beam shape that it would be directive. Example of a pattern for waveguide antenna

To achieve filtering a special shape of antenna is used Lo is the wavelength of the high frequency (hf) signal in open air or Lo/mm = 300 / (f/GHz). Lc is the wavelength of the low cut frequency which depends on tube diameter only Lc = k x D, where k – is a coefficient Lg is standing wavelength inside the tube; it is function of both Lo and Lc

Parameters of a real antenna D83 mm ¾ Lg180 mm ¼ Lo31 mm Designed Frequency2.442 GHz Low cut frequency1.983 GHz High cut frequency2.541 GHz

Several approaches of increasing SNR Waves are bypassing antenna Regular can antenna

Waves are reflecting into antenna Can antenna with funnel

Combo satellite dish + can antenna So we can gain more signal power from the space.

Simulated azimuth and 3D patterns for my antenna without can

α Access point in a zero degree position Access point in a (0+α) degree position Can antenna Experiment setup for building up azimuth antenna pattern.

Experiment setup for measuring SNR of the antenna. Access point on Sprau Tower Antenna positions For each position I’m planning to make more than 30 measurements to get proper statistical results.

By this time I have some measurements from a point located on stadium drive. These are results with antenna:

Next results when antenna was unplugged: