Multimode Decoupling Technique With Independent Tuning Characteristic for Mobile Terminals

Abstract

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Multiple‐input and multiple‐output antenna system with self‐isolated antenna element for fifth‐generation mobile terminals

“…Most importantly, the antenna total efficiencies are always better than 64%. This certainly confirms that, unlike the antenna total efficiency drops from more than 60% close to 38% when the multimode decoupling technique (see Figure of Ref. ) is used, the proposed antenna element does not sacrifice the antenna total efficiency of the 8‐antenna MIMO system.…”

“…This certainly confirms that, unlike the antenna total efficiency drops from more than 60% close to 38% when the multimode decoupling technique (see Figure of Ref. ) is used, the proposed antenna element does not sacrifice the antenna total efficiency of the 8‐antenna MIMO system. This is mainly because the extra or additional decoupling elements that may absorb the power of the antenna system are not needed in the proposed method.…”

“…The setup for the mobile phone including the dimensions of the system substrate and ground plane as well as the two small substrates are exactly the same as shown in Figure , except that four (instead of two) antennas are located along each of the small vertically substrate. As mentioned in Section 2.2, the setup of the MIMO antenna system (including the dimensions of the system substrate, the ground plane and the two small vertical substrates) is the same as that used in the 8‐antenna MIMO system . The reason of adopting the same setup is to have a direct comparison in antenna performance.…”

“…The fifth‐generation (5G) communication technology can provide many advantages such as higher transmission rate and shorter latency over the current 4G system . In order to achieve the higher transmission rate in mobile devices for the 5G bands below 6 GHz, the multiple‐input and multiple‐output (MIMO) system consisting of a relative big number of antennas (eg, 8‐antenna) should be adopted . Due to the limited space in mobile phones, however, how to achieve high isolation for such a big number of antennas becomes a critical challenge.…”

“…; the two asymmetrically mirrored antennas that have to be placed on the different sides of the system ground plane was employed; and the multimode decoupling technique was proposed in Ref. However, good isolation (better than 20 dB) can be achieved only with the decoupling approach developed in Ref. , which unfortunately also reduces the antenna efficiency.…”