표 5. | Table 5.
7.8 GHz 대역에서 외벽 개수에 따른 원편파 도파 관 안테나 특성 | Circular polarization waveguide antenna characteristic according to the number of outer walls in 7.8 GHz.

Number of outer walls	Simulation				Measurement
	0	1	2	3	3
Freq. [GHz]	7.8
S11 [dB]	−22.91	−35.23	−25.5	−26.19	−45.1
Axial ratio [dB]	2.86	1.21	1.08	0.99	1.61
Band width [GHz]	2.84 (36.4%)	2.91 (37.3%)	2.89 (37.1%)	2.28 (29.2%)	2.45 (31.4%)
Gain [dBi]	5.54	3.45	2.72	2.36	2.7
HPBW[°] @ yz-plane	70	80	126	147	145
FBR[dB]	15.74	15.03	10.56	8.15	10.62