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Bandwidth enhancement for thin substrate UHF RFID patch antenna

Prabakar Parthiban
Prabakar Parthiban
   | 02 mag 2019
International Journal on Smart Sensing and Intelligent Systems's Cover Image
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Article Category: research-article
Pubblicato online: 02 mag 2019
Pagine: 1 - 8
Ricevuto: 22 dic 2018
DOI: https://doi.org/10.21307/ijssis-2019-003
Parole chiave
© 2019 Prabakar Parthiban published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure. 1

Antenna designs and fabrications (dimensions are in mm): (a) Matched patch antenna design (b) −64% Intentional input mismatch, (c) −32% Intentional input mismatch (d) +32% Intentional input mismatch.
Antenna designs and fabrications (dimensions are in mm): (a) Matched patch antenna design (b) −64% Intentional input mismatch, (c) −32% Intentional input mismatch (d) +32% Intentional input mismatch.

Figure. 2

Return loss |S11| (top) and path loss |S21| (bottom) measurements.
Return loss |S11| (top) and path loss |S21| (bottom) measurements.

Figure. 3

Radiation pattern of −32% mismatched patch antenna.
Radiation pattern of −32% mismatched patch antenna.

Figure. 4

−32% mismatched patch with wood, glass and plastic assets.
−32% mismatched patch with wood, glass and plastic assets.

Figure. 5

Frequency sensitivity on matched vs −32% mismatched antenna.
Frequency sensitivity on matched vs −32% mismatched antenna.

Measured return loss, path loss and gain.

Low Freq. Mid Freq. High Freq.
Antenna type Measured loss Flow (MHz) Loss (dB) Fc (MHz) Loss (dB) Fhigh (MHz) Loss (dB)
Matched antenna Return loss 877.1 −5.04 915.0 −26.1 954.2 −5.08
Path loss 857.32 −27.4 915.0 −23.7 951.93 −27.4
Gain (dBi) 857.32 2.08 915.0 5.71 951.93 2.10
−64% Ω mismatch Return loss 901.7 −4.95 928.7 −5.93 960.7 −5.03
Path loss 901.73 −26.9 928.7 −26.8 960.71 −27.2
Gain (dBi) 901.73 2.59 928.7 2.66 960.71 2.22
−32% Ω mismatch Return loss 870.8 −5.06 915.0 −14.2 959.7 −5.05
Path loss 849.58 −27.4 915.0 −24.4 955.92 −27.4
Gain (dBi) 2.01 915.0 5.01 955.92 2.06 2.01
+32% Ω mismatch Return loss 893.2 −5.07 918.0 −32.3 942.87 −5.04
Path loss 893.27 −25.3 918.0 −24.3 942.8 −25.9
Gain (dBi) 4.18 918.0 5.17 942.8 3.55 4.18

Measured Azimuth and Elevation radiation pattern.

Azimuth Beam-width Elevation beam-width
Antenna type Flow Fc Fhigh Flow Fc Fhigh
−32% mismatch 83° 87° 89° 85° 90° 87°

Measured RSSI for various assets.

Reader output Frequency (MHz) 902 915 928 902 915 928 902 915 928 902 915 928
10 dBm Material Free space Wood Plastic Glass
RSSI (dB) −51 −52 −49 −67 −68 −69 −82 −84 −85 −86 −84 −84
−20 dBm Material Free space Wood Plastic Glass
RSSI (dB) −54 −52 −49 −69 −68 −68 −79 −79 −80 −82 −83 −83
30 dBm Material Free space Wood Plastic Glass
RSSI (dB) −50 −48 −47 −67 −68 −70 −83 −84 −82 −83 −82 −84
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