Bandwidth enhancement for thin substrate UHF RFID patch antenna Cover

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Bandwidth enhancement for thin substrate UHF RFID patch antenna

International Journal on Smart Sensing and Intelligent Systems

Volume 12 (2019): Issue 1 (January 2019)

By: Prabakar Parthiban

Open Access

|May 2019

Figures & Tables

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.

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

Radiation pattern of −32% mismatched patch antenna.

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

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	F_low (MHz)	Loss (dB)	F_c (MHz)	Loss (dB)	F_high (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	F_low	F_c	F_high	F_low	F_c	F_high
−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

DOI: https://doi.org/10.21307/ijssis-2019-003 | Journal eISSN: 1178-5608

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Language: English

Page range: 1 - 8

Submitted on: Dec 22, 2018

Published on: May 2, 2019

Published by: Professor Subhas Chandra Mukhopadhyay

In partnership with: Paradigm Publishing Services

Publication frequency: 1 issue per year

Keywords:

UHF RFID reader antennas,

Antenna sensors,

Impedance bandwidth,

Related subjects:

Introductions and overviews,

Engineering, other

© 2019 Prabakar Parthiban, published by Professor Subhas Chandra Mukhopadhyay
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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