6-Log-Periodic Patch Antenna With Tunable Frequency

M. F. Ismail, M. K. A Rahim, F. Zubir and O. Ayop, “Log-Periodic Antenna With Tunable Frequency”, 5th European Conference on Antenna and propagation (Eucap 2011), Rome, Italy, 11 – 15 April 2011.

Abstract— This paper describes the design and analysis of a Log- Periodic Microstrip Antenna Array operating between 3.3 Gigahertz (GHz) and 4.5 GHz. A five square patches fed by inset feed line technique are connected with a single transmission line by a log-periodic array formation. By applying five PIN Diodes at the transmission line with a quarter-wave length radial stub biasing, four different sub-band frequencies are configured by switching ON and OFF the PIN Diode. Simulation as well as measurement results with antenna design is presented and it shows that a good agreement in term of return loss. The simulated radiation pattern and realized gain for every sub bands also presented and discussed.

Keywords - Log-periodic, Microstrip antenna, Reconfigurable, PIN Diode