Design of a compact triple band antenna with independent frequency tuning for MIMO applications

Abstract

In this article, a planar, low profile microstrip line‐fed triple band multiple input multiple output (MIMO) antenna is presented for WiMax (2.5/3.5/5.5 GHz)/WLAN (2.4/3.6/5.8 GHz) applications simultaneously. The single element of the MIMO antenna consists of (i) a rectangular split ring resonator (SRR), (ii) a stepped impedance resonator (SIR) inside the SRR and (iii) a slot on the SIR. Each of the resonators generates its own individual band and each band is independently tunable. The antenna exhibits three operating bands at 2.35‐2.85 GHz, 3.25‐3.90 GHz and 5.45‐5.65 GHz. Four antenna elements are used to design the proposed MIMO antenna. The simulated results are observed and reported in terms of S‐parameters, gain, radiation patterns, envelope correlation coefficient (ECC), diversity gain (DG), channel capacity loss (CCL) and total active reflection coefficient. ECC and CCL are within the acceptable range defined for 4G and 5G application standards. To validate the simulation results a prototype structure is fabricated and the measured results are compared with those obtained from the simulation.

Four Element Mimo Dra With High Isolation for Wlan Applications

“…The upper limit of message transmission or reception rate over a communication channel is defined by channel capacity loss (CCL). Channel capacity using S-parameter can be calculated as [21]:…”

Isosceles Triangular Resonator Based Compact Triple Band Quad Element Multi Terminal Antenna

“…1. The antenna is fed by a 50 Ω microstrip line through a matching line [12]. The design steps to achieve triple band antenna are elaborated in three steps as shown in Fig.…”

“…A circularly polarized two elements MIMO antenna is proposed in [11] in which a grounded slit is used to achieve good isolation. A triple band MIMO antenna is proposed in [12] with independent tunable characteristics. In most of the previous works different type of isolation circuit is introduced to maintain the proper isolation in multiple bands which increases the design complexity.…”

Dual‐band circularly polarized multiple‐input multiple‐output antenna for GSM and lower LTE applications

“…The disadvantage of these antennas is the lack of MIMO property. It should be taken into consideration that many MIMO antennas have been designed and presented . The multi‐band antenna presented in Reference has three radiation elements with three input–output ports suitable for wireless local area network (WLAN) applications.…”

“…However, it has narrow bandwidth and bad impedance matching in both frequency bands. Furthermore, the antenna proposed in Reference with four ports, and the antenna proposed in Reference with two ports are designed for WLAN and worldwide interoperability for microwave access applications. A multi‐band antenna with two radiation patches for GSM and LTE applications is presented in Reference.…”