Study on Horizontally Polarized Omnidirectional Microstrip Antenna

Table 2

Roundness and gain variation against physical length .

	Physical length (mm)	Roundness	Gain variation (dBi)
2	λ/2	0	∞
4	λ/4	0.25	6.0
6	λ/6	0.56	2.4
8	λ/8	0.73	1.4
10	λ/10	0.82	0.8
16	λ/16	0.93	0.3
20	λ/20	0.95	0.2