Miniaturized Triband Planar Monopole Antenna using Right Turned L-Shaped Stubs for Wireless Communications

Due to the increasing use of communication networks and wide deployment of various wireless technologies, the transmit and receive antennas are expected to be compact, provide multi service with good radiation and bandwidth characteristics. This paper deals with integrative operation of two such wireless technologies such as Worldwide Interoperability for Microwave Access (WiMAX) and Wireless Local Area Network (WLAN) which are considered to be the key technologies used in wireless communication and Networks. In addition to this, enabling Aeronautical Mobile Communication for Airport transportation is also achieved. To accomplish all the above mentioned communication requirements, the antenna design proposed in this paper is enabled with a Right turned L-shaped connection between the feedline and the lower portion of the radiator to improve the impedance and bandwidth characteristics. A
$50 \Omega$
microstrip line is used to feed the radiating element. The length of the ground plane is reduced to achieve good bandwidth and resonance. The proposed antenna configuration resonates at 3.5 GHz (WiMAX), 4.75 GHz (Aeronautical Mobile Communication) and 5.5 GHz (WLAN) with a bandwidth of 400 MHz, 160 MHz and 200 MHz respectively. The foot print of the antenna is 35X12X1.6 mm3 providing an efficiency greater than 80% in all the three desired bands. The far field pattern of the proposed antenna is also obtained as per the application requirements. The entire design is simulated using Computer Simulation Technology (CST).