Design and analysis of a novel frequency reconfigurable antenna using RF MEMS switches.
Anya, Nicholas Brian
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The number of antennas used in wireless communication devices has tremendously increased over the last decade, which has led to the innovation and increased use of frequency reconfigurable antennas, where a single antenna can be used to support multiple applications such as Bluetooth, Wi-Fi, GSM, to efficiently use power and device space. Frequency reconfigurable antennas have been designed with switching mechanisms mostly using semiconductor RF switches such as PIN diodes, and FETS, however RF MEMS switches, have exhibited superior RF switching characteristics with regards to isolation and insertion loss compared to their semiconductor counterparts, as well as exhibiting large bandwidth up to 100 GHz from a few MHz exhibited in semiconductor switches. This research project investigates the potential to use RF MEMS switches in frequency reconfigurable antennas. Two RF MEMS series ohmic switch configurations are simulated from measured S-parameter data from the fabricated switches, and are found to have excellent isolation and insertion loss from 100 MHz to 20 GHz. A novel mono-pole frequency reconfigurable antenna is designed to test the usability of the switches. All simulations are performed in ADS software. The antenna is of a compact size and low profile and finds application in handheld devices with 2.06-2.58 dBi gain, 334-868 MHz bandwidth, and outstanding 91.6-94.9 % radiation efficiency compared to reported works, supporting sub-6 GHz 5G bands, and GSM, LTE, and UMTS.