Comparison of antenna performance according to construct tunable matching network

In mobile communication, frequency is an important resource for wireless communication. As frequency is limited, it is managed by the country and is distributed according to use. As a result, the frequency used for mobile communication is different is each country. In order to make a terminal that is usable in many countries, the terminal must be able to receive several frequency bands. This paper researches long term evolution (LTE) bands that have a target frequency range between 699~960MHz, which covers LTE bands 5,6,8,12,13,14,17,18,19,20,26 and 28. We use an inverted F antenna and, in order to cover the target frequency range, a tunable matching network. The simulation was conducted by SEMCAD X with a network analyzer used for measuring, and passive tests were conducted in an anechoic chamber. VSWR and efficiency was used as parameters to evaluate antenna performance. The 699~960MHz frequency range is divided into five parts for simulation and measurement. It was divided into 699~746MHz, 703~803MHz, 791~862MHz, 814~894MHz, 880~960 MHz ranges. In every frequency band but the 703~803MHz bands, VSWR 3:1 satisfied and antenna efficiency was over 40%.