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This paper deals with broadband circularly polarized patch antennas using an Artificial Ground (AG) structure with rectangular unit cells as a reflector. The AG structure has no band gap unlike the mushroom structures for electromagnetic band gap (EBG) and changes the reflection phase in accordance with the polarization state of the incident wave. By properly combining the transmitted wave from the...
We present field experiment results on multiple input multiple output (MIMO) precoding using orthogonal frequency division multiple access (OFDMA) in the E-UTRA downlink. We measured the throughput performance of 4??4 MIMO precoding with 1- to 4-stream transmission. Time variation characteristics of throughput, SINR, and antenna correlations are compared to evaluate the selection criteria for the...
This paper investigates the effect of precoding in multiple input multiple output (MIMO) transmission from the viewpoint of transmitter antenna configurations, i.e., space diversity (SD) or polarization diversity (PD), in field experiments using the Evolved UMTS Terrestrial Radio Access (E-UTRA) experimental system. The field experimental results show that there is no performance gap between with...
This paper investigates the effect of the antenna (polarization diversity (PD) or space diversity (SD)) configuration at evolved Node B and antenna angle of user equipment (UE) on the throughput performance of multiple input multiple output (MIMO) in Evolved UMTS Terrestrial Radio Access (E-UTRA) field experimental system. The results show that the throughput performance as a function of the measured...
In a ubiquitous network society, a universal platform is necessary to satisfy customerspsila increased demand on communication at any-time, anywhere and any-situation. Radio on fiber (RoF) technologies can realize a cost effective universal platform for ubiquitous wireless services. RoF networks can also be extended to radio on free space optics (RoFSO) providing communication links for heterogeneous...
The wave absorber composed of cylindrical bars arranged periodically and metallic mesh for improving visibility is proposed for ETC, and characteristics of reflectivity and shielding effect are evaluated analytically and experimentally. As a result, reflectivity of -10 dB and shielding effect of -25 dB are obtained for circularly polarized wave when the gap between cylindrical bars is 30 mm. Therefore,...
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