Price determinants of Airbnb listings is still in its infancy and Asian markets are underexplored. Based on existing literature, this article examines the impacts of five groups of explanatory variables on Airbnb price in Hong Kong: listing attributes, host attributes, rental policies, listing reputation, and listing location. Hedonic price regression highlights that: (a) compared with previous studies, the effect of room type on Airbnb price is exceptionally high in Hong Kong, due to the "the luxury of spaciousness" in this overpopulated city; (b) contradictory to previous findings, hosts' listings count have a negative effect on Airbnb listing price in Hong Kong, which can be explained by external (Hong Kong's fiercely competitive environment for multilisting Airbnb hosts) and internal (multilisting hosts' trade-off between booking opportunity and listing price) factors; (c) in Hong Kong, only low-end Airbnb rentals benefit from locational factors, indicating the heterogeneous effects of location on Airbnb pricing. These findings shed new light from previous studies and the authors provide possible explanations from theoretical and practical perspectives.

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A wideband low-profile transmitarray antenna has been designed. Several prototypes of unit-cells with different transmission phase shift ranges are used to constitute the antenna. To achieve wideband performance, the transmission phase versus frequency curves of these unit-cell prototypes are required to be nearly parallel in the working frequency band. Also, two or more unitcell prototypes instead of a uniform prototype are used to avoid introducing air gaps and reduce the thickness of transmitarray, which is commonly used in transmitarray design. A wideband millimeter wave dualpolarized transmitarray with a thickness of only 0.12λ 0 is designed, fabricated, and measured. It is demonstrated that the antenna has a wide 1-dB gain bandwidth of 20.2% (31-38 GHz), a gain higher than 31.4 dBi, and a peak aperture efficiency of 41.3%. Good agreement between simulations and measurement is achieved. K E Y W O R D Slow-profile transmitarray, transmitarray antenna, wideband antenna

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