A Novel Concentric Annular-Ring Slot Dual-Band Circularly Polarized Microstrip Antenna

Table 1

Value of each parameter.

Parameter	R1	R2	wa1	wa2	wi1	wi2	wo1
Value (mm)	12	8.4	1.6	0.8	0.6	1.2	1.8
Parameter	wo2	li	lo	wt	wf	Lt	Lf
Value (mm)	2.8	3.1	1.7	0.6	3	21	6