3-D Printed Circularly Polarized Open-Ended Waveguide Antenna Array Based on an In-Built Antipodal Exponential Groove Polarizer

Table 1

Comparison between this work and reported CP horn antennas with in-built polarizers.

Ref.	Ant. type	Freq. (GHz)	Dimensions ()	3 dB ARBW	Gain (dBic)	Fab. method	Fab. difficulty	Weight
7	Element	15.8	NG	≈4%	14	Machining + PCB	High	Heavy
8	Element	85		21% ( dB)	20.3	Machining	High	Heavy
9	Element	10		51%	10.1	Metal 3-D printing	Easy	Heavy
10	Element	57	NG	7.9%	≈12	Machining	High	Heavy
This work	Element	5.8		16%	6.2	Dielectric 3-D printing + electroplating	Easy	15 g
	array			11.1%	11.1			76 g

NG stands for not given. This is an overlapped bandwidth of the impedance bandwidth and ARBW of this antenna.