Design of a Three-Dimensional Uniform UHF Near-Field RFID Reader Antenna

Table 2

Comparison between the proposed and previous works.

References	Frequency range (GHz)	Far-field gain (dBi)	Antenna size (mm^2)	Field uniform dimension	Using tag types	Read range (mm^3)
[15]	0.82–0.96	−10	225.6  220	Two	Alien A9662	450  450  350
[16]	0.92–0.925	−6	270  150	Two	Alien A9662	400  320  300
[17]	0.8–0.94	—	250  250	Two	LAB-ID Inlay UH100	640  6640  100
This work	0.66–0.98	−27	117  117	Three	Alien A9662	99  99  20