A Decoupling Network for Resonant and Non-Resonant Sub-1 GHz MIMO Mobile Terminal Antennas With Improved Compactness and Efficiency

Abstract

In this work, the design procedure of a new decoupling network for different antennas is presented for mobile terminals operating in the Sub-1 GHz band (from 0.698 to 0.96 GHz). To evaluate its applicability for different resonant and non-resonant antenna types, two antenna elements have been chosen to be decoupled using the proposed decoupling network: a printed inverted-F antenna and a capacitive coupling element antenna. Simulation and measurement results showed that the decoupling network offer promising improvements in terms of impedance matching, port isolation, envelope correlation coefficient (ECC), and total efficiency. In addition, the antennas are also investigated with the ergodic capacity, multiplexing efficiency, gain, and diversity gain (both calculated using maximal ratio combining technique). Due to the contribution of the decoupling network, the ECC of both types of multiple antennas are less than 0.3, with a 30 % improvement in total efficiency and an inter-element spacing miniaturization of 34 %.INDEX TERMS Decoupling networks, mutual coupling, multi-input multi-output, low frequency, mobile terminal antennas.

Isolation enhancement of compact co‐polarized circular patch antennas using embedded series resonator

“…1 This phenomenon poses numerous negative consequences, as it inevitably leads to poor inter-port isolation, thereby appreciably deteriorating the impedance matching and radiation performance of multiple-input multiple-output (MIMO) antennas. To suppress mutual coupling, a range of decoupling techniques have been devised by scholars, including electromagnetic bandgap (EBG) structures, 2,3 defect ground structures (DGSs) [4][5][6] decoupling networks (DNs) [7][8][9] LC resonators, 10,11 decoupling metasurfaces, 12,13 as well as self-decoupling methods. [14][15][16][17][18] Although EBG structures effectively hinder the propagation of coupling energy, they occupy considerable space.…”