A Pattern Reconfigurable U-Slot Antenna and Its Applications in MIMO Systems
Top Cited Papers
- 25 October 2011
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Antennas and Propagation
- Vol. 60 (2), 516-528
- https://doi.org/10.1109/tap.2011.2173439
Abstract
A new compact pattern reconfigurable U-slot antenna is presented. The antenna consists of a U-slot patch and eight shorting posts. Each edge of the square patch is connected to two shorting posts via PIN diodes. By switching between the different states of the PIN diodes, the proposed antenna can operate in either monopolar patch or normal patch mode in similar frequency ranges. Therefore, its radiation pattern can be switched between conical and boresight patterns electrically. In addition, the plane with the maximum power level of the conical pattern can be changed between two orthogonal planes. Owing to a novel design of the switch geometry, the antenna does not need dc bias lines. The measured overlapping impedance bandwidth (|S11| <; -10 dB) of the two modes is 6.6% with a center frequency of 5.32 GHz. The measured radiation patterns agree well with simulated results. The antennas are incorporated in a 2 × 2 multiple-input-multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system to demonstrate the improvement in system capacity. In the real-time MIMO-OFDM channel measurement, it is shown that compared to omnidirectional antennas, the pattern reconfigurable antennas can enhance the system capacity, with 17% improvement in a line-of-sight (LOS) scenario and 12% in a non-LOS (NLOS) scenario at a signal-to-noise ratio (SNR) of 10 dB.This publication has 31 references indexed in Scilit:
- Effect of Antenna Polarization Diversity on MIMO System CapacityIEEE Antennas and Wireless Propagation Letters, 2010
- Diversity and its applications in ultra-wideband antennasPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2009
- Reconfigurable microstrip antenna with pattern and polarisation diversitiesElectronics Letters, 2007
- Characteristics of MIMO-OFDM Channels in Indoor EnvironmentsEURASIP Journal on Wireless Communications and Networking, 2006
- A MIMO System With Multifunctional Reconfigurable AntennasIEEE Antennas and Wireless Propagation Letters, 2006
- A Review of Antennas and Propagation for MIMO Wireless CommunicationsIEEE Transactions on Antennas and Propagation, 2004
- Broad-Band Dual-Frequency Microstrip Patch Antenna With Modified Sierpinski Fractal GeometryIEEE Transactions on Antennas and Propagation, 2004
- Effect of antenna polarization on the capacity of a multiple element system in an indoor environmentIEEE Journal on Selected Areas in Communications, 2002
- Spatial, polarization, and pattern diversity for wireless handheld terminalsIEEE Transactions on Antennas and Propagation, 2001
- Antenna diversity in mobile communicationsIEEE Transactions on Vehicular Technology, 1987