A Dual-Polarization Slot Antenna Using a Compact CPW Feeding Structure
ABSTRACT 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.
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ABSTRACT: Two compact coradiator multiple-input–multiple-out (MIMO) antennas operating in the UWB frequency band with dual polarization are proposed. Different from traditional MIMO antennas, the radiator is shared by two antenna elements, which greatly reduce the overall size of the MIMO system. High isolation between the two antenna elements is achieved by etching a T-shaped slot in the radiator and extending a stub on the ground. Dual polarization can be realized by exciting the pentagonal radiator with perpendicular feeding structure. The simulated results of current and electric-field distribution show the dual-polarization characteristics of the diversity system. Besides, a four units UWB MIMO antenna is also proposed. Furthermore, the diversity characteristics of mean effective gains (MEGs) and diversity gain (DG) are also studied. The simulated and measured results demonstrate that the UWB-MIMO antenna has good impedance matching, isolation and dual polarization characteristics.IEEE Transactions on Antennas and Propagation 09/2014; 62(9):4474-4480. · 2.46 Impact Factor
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ABSTRACT: In this letter, a dual-frequency dual-polarization slotted waveguide antenna array at Ka-band is proposed. A $9 times 10$ inclined slot array working at 35 GHz, cut in the narrow wall of rectangular waveguides, is employed for horizontal polarization (HP). An $8 times 10$ longitudinal slot array working at 30 GHz, etched on the broadside of ridged waveguides, is employed for vertical polarization (VP). The two arrays are interlaced with each other and fed from the opposite sides. Two novel bend interconnected structures are invented to connect the radiating waveguides and feeding networks, which simplify and compact the antenna structure and improve the aperture efficiency. The measured $ - $10-dB reflection coefficient bandwidth of HP array is 688 MHz, and 658 MHz for VP array. The maximum gain is 25.4 and 24.8 dB for HP array and VP array, which correspond to the aperture efficiency of 36.3% and 43.05%, respectively. The sidelobe levels of both arrays are below $ - $17.6 dB.IEEE Antennas and Wireless Propagation Letters 01/2014; 13:1317-1320. · 1.95 Impact Factor
Conference Paper: MIMO Monopole Antenna for LTE Systems[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