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1.	Liao, Wan-Chun, 1985, et al. (author) A Directly Matched PA-Integrated K-band Antenna for Efficient mm-Wave High-Power Generation 2019 In: IEEE Antennas and Wireless Propagation Letters. - 1548-5757 .- 1536-1225. ; 18:11, s. 2389-2393 Journal article (peer-reviewed)abstract A K-band slot antenna element with integrated GaN (Gallium nitride) power amplifier (PA) is presented. It has been optimized through a circuit-EM co-design methodology to directly match the transistor drain output to its optimal load impedance ( Zopt=17+j46Ω ) while accounting for the over-the-air coupling effects in the vicinity of the transition between the PA and antenna. This obviates the need for using a potentially lossy and bandwidth-limiting output impedance matching network. The measured PA-integrated antenna gain of 15 dBi with a 40% total efficiency at 28 dBm output power agrees well with the theoretically achievable performance targets. The proposed element is compact ( 0.6×0.5×0.3 λ3 ), and thus well-suited to meet the high-performance demands of future emerging beamforming active antenna array applications.

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