Over-the-Air Proof of Concepts
In this chapter we will validate the previously reported concept regarding the capability of transmitting multiple signals (i.e., performing spatial multiplexing) using one RF chain by using the ESPAR antenna that is presented in Chap. 6. The experiments were conducted in the indoor environment of AIT’s B-WiSE Lab, using a 2.6 GHz prototype made of a single active printed dipole coupled to two passive ones and AIT’s MIMO testbed. To the best of our knowledge, this is the first over-the-air experiment of spatial multiplexing with a single RF front-end yet to be demonstrated. The use of this specific ESPAR antenna in a cognitive radio context will also be shown. The ESPAR antenna will be used as a secondary transmitter and based on two different scenarios we will measure the interference it will cause to the primary receiver. Finally, a new printed parasitic antenna array with one active and four parasitic elements aiming for maximum beamforming gain toward one direction will be presented.
KeywordsMicrowave Active Element
Philippos Tragas is now working as an RF/Wireless Engineer in Broadcom Corporation.
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