Design and analysis of LTE 3D antennas

This paper investigates the design of a compact monopole LTE three-dimension (3D) antenna. LTE operational bandwidth is indispensable while a 3D antenna is used to make 4G mobile phone applicable. The gaps between handset housing and circuit board will be used to design an antenna suitable in the confined space. To simplify the design, a common plane waveguide needs to be fed by the antenna. The advantage is that it is easy to shape the antenna only using the single layer of metal media board and also simple to make circuit board in the future. The main design of the antenna structure is to apply multipath monopole antennas to resonate the low frequency and high frequency bands. Then we can extend the high-frequency bandwidth of LTE by a 3D metal coupling section. For spreading the bandwidth, we need to use the coupling rod to get better match of impedance. Simulation and test measurements of the 3D antenna design are also studied.