The Physics of Basic Antenna Theory and Design

Long ago, a group of cats had the same problem with our human antenna. When you need to maintain "magical position". Unfortunately, they do not have this page for reference, so they are dead. This leaves room for mankind. At first, human beings can only talk orally at short distance, they are crying far away.

As a very simple overview, the antenna array is a separate set of antennas connected to each other. Basically, you can design arrays that are more sensitive to the desired direction than the individual antennas themselves. When properly designed, the radio waves emitted by each individual antenna are combined together and summed together to increase the power radiated in the desired direction, in order to reduce the power radiated in the other direction . Because there is reciprocity, the same situation occurs when receiving radio waves.

Recent antenna development at the University of Rhode Island physics department has created a new antenna technology. A developed antenna called DLM (Distributed Loaded Monopole Antenna) is a compact and efficient broadband antenna. Simple design has 50 ohm impedance, easy to implement. They require only a direct supply from the coaxial cable and do not require a complicated matching network. The main advantage of this technology is that the size of the antenna is greatly reduced. Normally, the DLM antenna is about the same size as a normal dipole, and the efficiency slightly decreases. This is particularly important for automotive applications where space is always very valuable. Such antennas are used for monitoring various RF radar and communication applications, as well as RFID, SAW and similar devices on vehicles, especially for monitoring tire pressure, temperature and / or acceleration, and other monitoring purposes can do.