A dual-polarization coplanar waveguide (CPW)-fed slot antenna is proposed in this letter. By exploiting the even and odd modes of a CPW structure, two orthogonal polarizations can be excited in a slot aperture by the same feeding CPW, which results in a compact dual-polarization antenna design with very good isolation between the ports. The -10-dB reflection coefficient bandwidths of two polarizations are 670 MHz (27.9%) for one polarization and 850 MHz (35.4%) for the other, and the isolation between the two ports in the WLAN band is better than -32.6 dB. The radiation pattern and efficiency of the proposed antenna are also measured, and radiation pattern data are compared with simulation results.
"Alternatively, Electromagnetic Band Gap (EBG) cells can be introduced to suppress coupling . Defective ground structures , various neutralization methods , orthogonal feeding modes  and orthogonal elements  have also been investigated to achieve the optimum performance of a MIMO system. "
[Show abstract][Hide abstract] ABSTRACT: This paper reports on a compact planar dualband
Multiple-Input and Multiple-Output (MIMO) antenna
for Wireless Local Area Network (WLAN) applications. The
proposed antenna primarily consists of two meandered monopole
radiators; which are decoupled by introducing a folded Y-shape
isolator element and it is shown that the edge coupling between
the radiators and isolator introduces the resonance at the lower
band. The miniaturization is achieved by passing the signal on to
the bottom layer where a meandered line conductor introduces a
broadside coupling with the radiator originating the higher band
resonance. The antenna operates between 2.4 GHz to 2.5 GHz and
5.4 GHz to 5.825 GHz with an isolation of more than 30 dB and
15 dB, respectively. The antenna measures only 19 x 23 mm2.
"So it seems to be very essential to design adequate antenna due to use in MIMO systems. As revealed in many literatures      , both of non printed MIMO antennas such as planar-inverted F antennas (PIFAs) and printed MIMO antennas are proposed. However, among the antennas which are used for MIMO application, printed antennas are more appropriate due to their low cost, easy fabrication, and their capability of easily being integrated to small terminal devices. "
[Show abstract][Hide abstract] ABSTRACT: A novel printed planar monopole antenna for LTE multi-input and multi-output (MIMO) application is proposed. By adding E-shaped parasitic elements, additional resonances are created, and then much wider impedance bandwidth can be produced. The proposed antenna provides LTE bands 1, 2, 3, 4, 9, 10, 11, 21, 23, 24, 25, and uplink of 15, 16, 22 bands. In order to provide low mutual coupling and envelope correlation, two of the antennas are combined with orthogonal polarizations. The mutual coupling of the antenna is lower than -19 dB, across the operation bands. Also, by adding a new stub to this structure and changing the parameters, lower frequency bands of LTE are covered. The designed antenna has small size area of 55 × 99 mm2, which has a small size, with respect to recently reported antennas.
The 22nd Iranian Conference on Electrical Engineering (ICEE 2014), May 20-22, 2014, Shahid Beheshti University, Shahid Beheshti University; 05/2014
"Isolation between RHCP and LHCP ports is a crucial issue for potential applications. However, due to the use of 90˚phase shifter, the principles for achieving good and wideband isolation are different to those presented in . Fig. 10 illustrates the phase of the signal, which is reflected from the patch. "
[Show abstract][Hide abstract] ABSTRACT: This communication proposes a new patch antenna with dual circularly polarized capability at 2.575 GHz. The design exploits the even and odd modes in a coplanar waveguide transmission line and enables simultaneous right- and left-handed circular polarization, with two individual excitation ports. A patch antenna is fed by multimode transmission line and the advantages and disadvantages are discussed. A prototyped antenna realized up to 20 dB isolation between ports with S21 <; -10 dB bandwidth of 87 MHz. Realized gains for the two modes of operation are 5.77 and 7.23 dBic. The proposed structure is compact and easy to manufacture.
IEEE Transactions on Antennas and Propagation 09/2013; 61(9):4828-4831. DOI:10.1109/TAP.2013.2269471 · 2.18 Impact Factor
Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.