Abstract
This paper presents two tunable three-feed triple-band antennas using series or shunt tuning devices. The paper includes a theoretical analysis in the effects of the series and shunt tuning devices on antenna size and performance. Each antenna has three feeds to cover three bands within the long-term evolution (LTE) frequency range (0.7–2.7 GHz). Each antenna operating frequency is independently tunable by a varactor diode (series or shunt). The antennas are well matched at all feeds (S11-S33 < −10 dB) and the isolation between the feeds is <−20 dB in most cases. The antenna volume is 66 × 100 × 3.15 mm3 and is placed on RO4003C (εr = 3.55) printed-circuit board (PCB). Radiation patterns and antenna efficiency are measured inside a Satimo chamber and the results agree well with the simulations. This paper shows the first comparison between series and shunt tuning devices on small antennas. Application areas include cellular communications, carrier aggregation, and advanced multiband systems.
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