A software defined antenna (SDA), following and exploiting the concept of software-defined radio (SDR), is an idea for an antenna system that can be adjusted in such way that similar characteristics can be maintained for any frequency. Once installed, SDA could be used to support any radio-based telecommunication system in any band, with the same level of performance, e.g., GSM 900 MHz, then UMTS after migration to 2100 MHz followed by LTE in 2600 MHz band.
The first mathematical research on SDA began in the late 1950s (U.S. Patent 3,202,990) and focused on steering the side lobes of radar receivers to be less susceptible to jamming, but rapid developments in SDR technology are causing manufacturers to pay more attention to this subject in general.
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