#Antenna tuner simulator how to

They are mainly used where there is space constraint, for example, inside Mobile Phones. They do not require any m atching components as the matching is done by changing the length of the antenna. Their major disadvantage is also their size. Various modifications exist of dipole antennas, Half-wave, Monopole, Folded Dipole, Short Dipole and so on. Their radiation pattern is similar to Whip Antennas, Omnidirectional except for along the length of the dipole (Donut Shaped). Their major d isadvantage is Size and therefore these are not suitable to put inside a box.ĭipole antennas are simple in construction and don't require any additional ground plane. These are usually very efficient and are available with simple Plug and use standard connector (SMA, U.FL). They are Omnidirectional except for along the length of the antenna (Donut Shaped Radiation Pattern). Whip antennas are s imple in construction and are readily available in market. Antenna choice Commonly used antenna types: Whip Antenna: Therefore, reducing the VSWR from 2 to 1.8-1.7 won't bring in much improvements to your antenna tuning. VSWR of 1.5 will increase this transmitted power to 96%, which isn't very big jump. This means that to the antenna, 89.9% of power is transmitted. VSWRĪs can be seen from the table, VSWR of 2 corresponds to 11.1% of reflected power. In general, if the VSWR is under 2 the antenna match is considered very good and little would be gained by impedance matching. In this case, no power is reflected from the antenna, which is ideal. The smaller the VSWR is, the better the antenna is matched to the transmission line and the more power is delivered to the antenna. The VSWR is always a real and positive number for antennas. The reflection coefficient is known as s11 or return loss. It is a function of the reflection coefficient, which describes the power reflected back from the antenna. VSWR stands for Voltage Standing Wave Ratio. These are the most commonly used and heard terms when doing antenna tuning. It can increase the working range and can also help in reducing the power consumption of wireless device. A properly tuned antenna can help in many ways. Why tune an antenna?Īntenna is probably the most important part of a wireless system, as it is responsible for sending and receiving the data on the physical layer. If the antenna already has an impedance equal to the source impedance, there is no need of tuning. Antenna tuning is basically, the process of matching the antenna impedance with source impedance. The antenna) should be equal to the source impedance(usually 50 ohm or otherwise described). To reduce these reflections and ultimately power loss, the load impedance(i.e. These reflected waves creates ‘ Standing Waves’ in the transmission line and results in losses. Minimum reflection is obtained when source impedance is equal to the load impedance. When a high frequency signal is fed to an antenna to radiate, not all the power is radiated by the antenna but a small portion of it is reflected back to the source. These are determined by antenna's physical properties which include the shape, size, material and also by the environment. What is antenna tuning?Īn antenna has a resistance, capacitance and inductance.

#Antenna tuner simulator how to

Heard about antenna tuning but couldn't get past the mathematics behind it? Here is a quick and practical guide on how to go along with antenna tuning for your own IoT device.