A Review of Antenna Array Technologies for Point-to-Point and Point-to-Multipoint Wireless Communications at Millimeter-Wave Frequencies

Table 1

Advantages and disadvantages of commonly used antenna technologies for array development.

Technology	Advantages	Disadvantages
Patch	(i) Integration; (ii) Low cost	(i) Losses; (ii) Isolation
Vivaldi	(i) Wideband; (ii) High gain	(i) Bulky
DRA	(i) No conductor loss; (ii) High efficiency	(i) Manufacturing precision
Open-ended waveguide	(i) Stable radiation pattern; (ii) High efficiency	(i) Bulky; (ii) High costs
Gap waveguide	(i) Low losses; (ii) Wideband	(i) Design complexity
Resonant cavity	(i) High gain; (ii) Low cost	(i) Narrow 3 dB gain bandwidth