Design and Implementation of a Low-Profile Patch Antenna for Industrial NB-IOT Applications

Design and Implementation of a Low-Profile Patch Antenna for Industrial NB-IOT Applications

Muddineni Raveendra, Saam Prasanth Dheeraj Pedapalli, Bhoopalan S., Rajan A., Saravanakumar U.
Copyright: © 2022 |Pages: 14
DOI: 10.4018/978-1-7998-9315-8.ch005
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Abstract

For the requirement of NB-IOT applications, rectangular micro strip slot antennas have been developed with sufficient bandwidth of 112.5 MHz. The above 50% size of the antennas has been reduced by making multiple rectangular slots on the patch surface. Fr4 material has been utilized as a dielectric substrate. The position of the transmission line has been varied to match the perfect impedance matching. The proposed antenna model has been simulated on HFSS software. To check the practical behavior of the designed antenna, it has been fabricated and tested by using vector network analyzer. The proposed antenna has resonance frequency band from 1718.75 MHz – 1831.25 MHz with minimum return loss performance as below -20 dB.
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Proposed Antenna Design

The goal of this work is to design a simple and compact microstrip patch antenna at NB-IOT operating frequency band. The theoretical geometry calculations of the proposed antennas as follows below derivation. The width of the antenna can be calculated from equation (1). Later by substituting the height of the substrate 1.6 mm in equation (2), effective dielectric constant has been found to obtain the length of the antenna from the equation (3).f0= 1755 MHzDielectric constant = 4.4f0 = Resonant frequencyWidth calculation978-1-7998-9315-8.ch005.m01 mm(1)978-1-7998-9315-8.ch005.m02 mmW = 51.89 mmCalculation of the Effective Dielectric Constant978-1-7998-9315-8.ch005.m03 ] ……(2) Let height of the dielectric medium h = 1.6 mm.

978-1-7998-9315-8.ch005.m04
]
978-1-7998-9315-8.ch005.m05
𝜀eff = 2.7+(1.7×1.090547)𝜀eff = 4.152Calculation of effective length:978-1-7998-9315-8.ch005.m06 mm978-1-7998-9315-8.ch005.m07 mmLeff= 41.9455 mmCalculation of length extension:978-1-7998-9315-8.ch005.m08 mm ………….(3)978-1-7998-9315-8.ch005.m09mm978-1-7998-9315-8.ch005.m10mm∆L = 0.74150 mmCalculation of actual length of the patch

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