This study evaluates the feasibility of plane-wave field synthesis (PWS) technique for multiple-input multipleoutput (MIMO) over-the-air (OTA) test facility, where a reference channel model is implemented. The test facility is based on a fading emulator and an anechoic chamber, equipped with multiple field emulating probes. The test facility emulates a radio channel condition using the PWS technique, based on the spherical wave theory. A simulation tool implementing the MIMO OTA field synthesis based on the PWS technique, named WIN-OTA, is established where the WINNER II is chosen as the reference channel model. The simulation results show that the PWS technique reproduces the reference channels accurately in terms of envelope distribution, spatial and temporal correlation, and channel capacity. The WIN-OTA implementation was verified by comparing the emulated fields and the throughput (TP) from the simulations with measurements for a practical MIMO OTA test facility. The results support the feasibility and accuracy of the field synthesis technique and the WIN-OTA implementation in MIMO OTA antenna testing.Index Terms-MIMO, MIMO OTA testing, plane wave, spherical wave expansion. . His current research interests are in the field of millimeter-wave CMOS circuits for integrated radio frontends.
In this paper, we have presented a design of onchip millimeter-wave 3-dB quadrature coupler that utilizes the coupled slow-wave coplanar waveguide (CS-CPW). The designed CMOS coupler covers the whole E-and W-band and occupies a silicon area of only 0.0115 mm 2 which is significantly smaller compared to the conventional microstrip-line-based Lange couplers. Measurement of the quadrature coupler shows a -3.5 dB through and a -4.4 dB coupling at 90 GHz. A less than ±1-dB amplitude and a ±4 • phase errors from 55 to 110 GHz are recorded.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.