Results

Conventional Bowtie antenna

Modified Bowtie antenna with T-matched and slots

Resonant frequency

899 MHz

901 MHz

S₁₁

−23.161 dB

−35.28 dB

Z_chip

15.05 − j163.91 Ω at f = 900 MHz

Z_antenna

17.22 + j163.44 Ω

15.38 + j163.7 Ω

Standard bandwidth

860 MHz - 960 MHz

at

889 MHz

859 MHz

at

912 MHz

1.02 GHz

Fractional bandwidth

2.55%

18%

Reading range (m)

6 m

5.9 m

Directivity

2.134 dBi

2.81 dBi

Gain

−8.99 dBi

−9.7 dBi

Radiation efficiency

69.86%

56.12%

Conjugate match efficiency

34.9%

28.06%