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Bandwidth enhancement for thin substrate UHF RFID patch antenna

Prabakar Parthiban

Prabakar Parthiban

Auckland University of TechnologyAuckland, New Zealand
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Parthiban, Prabakar
  
02 may 2019
Bandwidth enhancement for thin substrate UHF RFID patch antenna's Cover Image
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Categoría del artículo: research-article
Publicado en línea: 02 may 2019
Páginas: 1 - 8
Recibido: 22 dic 2018
DOI: https://doi.org/10.21307/ijssis-2019-003
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© 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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