Resonant antenna vs Non-resonant antenna | difference between Resonant antenna and Non-resonant antenna
This page compares Resonant antenna vs Non-resonant antenna and describes difference between Resonant antenna and Non-resonant antenna types.
The resonant antennas are like resonant transmission lines. The dipole antennas are example of this antenna type. They are open ended at far end with resonant length. The term resonant length refers to multiple of quarter wavelength. It is placed at a point on the transmission line where it delivers low impedance. Usually, this location is quarter wavelength (i.e. λ/4) from the open circuit end. The figure-1 depicts half wave dipole and its radiation pattern looking like a doublet.
The radiation pattern of resonant antennas have two parts viz. one due to forward and the other due to reflected wave. The figure-2 depicts these as well as combined radiation pattern of resonant antenna.
The Non-resonant antennas are like nonresonant transmission lines. Nonresonant transmission lines do not have standing waves. Hence they do not have any reflected waves and they have only forward travelling waves.
When the antenna is terminated as depicted in the figure-3, about (2/3)rd power is transmitted as forward waves and remainding power is dissipated and there is no reflected power towards the input.
From the radiation patterns of both, the difference between resonant antenna and nonresonant antenna is as follows.
➨Nonresonant antennas are uni-directional and resonant antennas are bi-directional.
➨In nonresonant antennas only forward waves exist and in resonant antennas both forward and reflected waves exist.
Antenna related links
What is Difference between
difference between FDM and OFDM
Difference between SC-FDMA and OFDM
Difference between SISO and MIMO
Difference between TDD and FDD
Difference between 802.11 standards viz.11-a,11-b,11-g and 11-n
OFDM vs OFDMA
CDMA vs GSM
Bluetooth vs zigbee
Fixed wimax vs mobile