In this study, to design a compact four‐port multiple‐input–multiple‐output (MIMO) antenna for dual‐band wireless local area network applications, both frequency and isolation between antennas are made as reconfigurable. Both antenna element and decoupling network shown in this study are designed using meander line concept. The frequency reconfigurable capability of the antenna is achieved by incorporating positive‐intrinsic‐negative (PIN) diodes in the meander line resonator. By making PIN diodes ON and OFF, four antenna elements switch their operating frequency in between 2.4–2.5 and 5.1–5.8 GHz bands. Isolation between the antenna elements also made as reconfigurable by placing PIN diodes in the decoupling network. In ON state, isolation is found in 2.4–2.5 GHz band, whereas in OFF state, isolation is achieved in 5.1–5.8 GHz band. Overall, in both the bands, excellent isolation (more than 15 dB) between the antenna elements has been achieved. The proposed antenna design is printed on the FR‐4 substrate and its overall area is 38 × 38 mm2. Each antenna element is in polarisation diversity with the adjacent antenna element which makes the proposed design suitable for achieving good MIMO performance.
In this article, a wideband circularly polarized rectangular dielectric resonator antenna (RDRA) coupled through orthogonal slots and excited with a new microstrip circular ring has been investigated. Circular polarization has been achieved by using plus shaped (1) slot on the ground plane and excited through a new microstrip circular ring feed. TE 11d mode has been excited in the RDRA which has been confirmed through the distribution of E-field and dielectric waveguide model (DWM) method of RDRA. Circularly polarized (CP) RDRA offering measured 210 dB input impedance bandwidth of 20.79% (centered at 3.27 GHz) and 3 dB axial ratio bandwidth in broadside direction of 12.09% (centered at 3.39 GHz), respectively. From the CP radiation pattern, proposed design confirms that right-handed CP (RHCP) in broadside direction. The difference between RHCP field and left-handed CP (LHCP) field are above 226 dB in operational band. In addition, the proposed CP antenna offers stable gain and radiation efficiency in working bands and it is suitable for IEEE 802.16e/d Wi-MAX (3.3-3.7 GHz) band.
K E Y W O R D Scircular polarization, dielectric resonator antenna, slot excitation
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