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arxiv: 1906.10554 · v1 · pith:X4WSKAWQnew · submitted 2019-06-24 · ⚛️ physics.med-ph · eess.SP

Design of a 1x4 CPW Microstrip Antenna Array on PET Substrate for Biomedical Applications

U. Farooq , A. Iftikhar , M. S. Khan , M. F. Shafique , Raed M. Shubair This is my paper

Pith reviewed 2026-05-25 17:07 UTC · model grok-4.3

classification ⚛️ physics.med-ph eess.SP
keywords CPW microstrip antennaPET substrateadhesive copper foilbiomedical applicationswearable antennawireless powering1x4 array2.68 GHz
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The pith

A 1x4 CPW microstrip antenna array on flexible PET substrate using adhesive copper foil resonates at 2.68 GHz with 10 dBi gain for body-worn biomedical use.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper presents a single-layer coplanar waveguide-fed microstrip patch antenna array with four radiating elements fabricated on transparent flexible PET substrate. The design measures 280 by 192 mm and employs cost-efficient adhesive copper foil for the conductive patterns rather than conventional deposition methods. Simulations show resonance at 2.68 GHz and a peak gain of 10 dBi, with a prototype confirming that measured results align closely with the simulated performance. The authors state that this low-profile construction has potential for wearable body-worn applications including wireless powering of implantable medical devices.

Core claim

The authors present a 1x4 CPW microstrip patch antenna array fabricated on PET substrate using adhesive copper foil. The structure resonates at 2.68 GHz with a simulated peak gain of 10 dBi. A prototype was built and measured results match the simulations, supporting the claim that this low-profile cost-efficient design can be used in wearable biomedical applications including wireless powering of implants.

What carries the argument

The 1x4 CPW-fed microstrip patch array realized on PET substrate with adhesive copper foil patterns.

Load-bearing premise

The adhesive copper foil maintains conductivity and adhesion when exposed to moisture, flexing, and skin contact in biomedical settings.

What would settle it

Fabricate the array and re-measure resonance frequency and gain after 24-hour exposure to saline solution or 100 bending cycles to determine whether performance remains at 2.68 GHz and near 10 dBi.

Figures

Figures reproduced from arXiv: 1906.10554 by A. Iftikhar, M. F. Shafique, M. S. Khan, Raed M. Shubair, U. Farooq.

Figure 2
Figure 2. Figure 2: Pictures of the fabricated prototype showing conformability of the proposed transmit antenna array [PITH_FULL_IMAGE:figures/full_fig_p006_2.png] view at source ↗
Figure 4
Figure 4. Figure 4: Simulated E- and H-plane radiation patterns of the proposed CPW microstrip antenna transmit array at 2.68 GHz [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
read the original abstract

In this paper, a single layer Coplanar Waveguide-fed microstrip patch antenna array is presented for biomedical applications. The proposed antenna array is realized on a transparent and flexible Polyethylene Terephthalate substrate, has 1x4 radiating elements and measures only 280 x 192 mm2. The antenna array resonates at 2.68 GHz and has a peak-simulated gain of 10 dBi. A prototype is also fabricated, and the conductive patterns are drawn using cost-efficient adhesive copper foils instead of conventional copper or silver nanoparticle ink. The corresponding measured results agree well with the simulated results. The proposed low profile and cost-efficient transmit antenna array has the potential for wearable born-worn applications, including wireless powering of implantable medical devices.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The manuscript presents the design, simulation, and fabrication of a 1x4 CPW-fed microstrip patch antenna array on a flexible PET substrate using adhesive copper foil. The array measures 280 x 192 mm², resonates at 2.68 GHz, achieves a simulated peak gain of 10 dBi, and the fabricated prototype shows measured S-parameters and radiation patterns that agree with simulations. The authors conclude that the low-profile, cost-efficient design has potential for wearable body-worn biomedical applications, including wireless powering of implantable medical devices.

Significance. If the material stability in biomedical environments is confirmed, the work would demonstrate a practical, low-cost fabrication route for flexible antennas suitable for body-worn telemetry. The direct simulation-to-measurement agreement provides basic validation of the design at 2.68 GHz, but the lack of environmental or on-body testing limits the significance for the stated biomedical claims.

major comments (2)
  1. [Abstract] Abstract and conclusion: the central claim that the array 'has the potential for wearable body-worn applications, including wireless powering of implantable medical devices' rests on the unverified assumption that adhesive copper foil conductivity and adhesion remain stable under moisture, repeated flexing, and skin contact. The manuscript reports only standard laboratory S-parameter and pattern measurements with no material characterization, environmental aging, or on-body tests, leaving the biomedical applicability unsupported.
  2. [Results] Results section (comparison of simulated vs. measured data): the statement that 'measured results agree well with the simulated results' is presented without error bars, fabrication tolerance analysis, or quantified discrepancy metrics, which weakens the support for the performance claim under realistic deployment conditions.
minor comments (2)
  1. [Abstract] Abstract: 'wearable born-worn' appears to be a typographical error and should read 'wearable body-worn'.
  2. [Simulation] The manuscript would benefit from explicit discussion of the PET substrate dielectric properties and copper foil conductivity values used in the simulation model, including any sensitivity analysis.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive comments. We address each major comment below, indicating where revisions to the manuscript are planned.

read point-by-point responses

  1. Referee: [Abstract] Abstract and conclusion: the central claim that the array 'has the potential for wearable body-worn applications, including wireless powering of implantable medical devices' rests on the unverified assumption that adhesive copper foil conductivity and adhesion remain stable under moisture, repeated flexing, and skin contact. The manuscript reports only standard laboratory S-parameter and pattern measurements with no material characterization, environmental aging, or on-body tests, leaving the biomedical applicability unsupported.

    Authors: We agree that the manuscript contains no material characterization, environmental aging, or on-body tests. The suggestion of potential for wearable biomedical use is based on the known flexibility and low cost of the PET substrate and adhesive copper foil fabrication method. To better align the text with the presented data, we will revise the abstract and conclusion to qualify the applicability statement, noting that further validation of material performance under relevant conditions would be needed. revision: yes

  2. Referee: [Results] Results section (comparison of simulated vs. measured data): the statement that 'measured results agree well with the simulated results' is presented without error bars, fabrication tolerance analysis, or quantified discrepancy metrics, which weakens the support for the performance claim under realistic deployment conditions.

    Authors: The referee is correct that the comparison is presented qualitatively without error bars or quantified metrics. The agreement is based on visual correspondence of the S-parameter and radiation pattern curves. In the revised manuscript we will add a discussion of observed discrepancies (e.g., any resonant frequency shift or gain difference) together with an estimate of fabrication tolerances arising from manual placement of the adhesive copper foil. revision: yes

Circularity Check

0 steps flagged

No circularity; standard antenna design and measurement with independent sim/meas comparison

full rationale

The paper describes a CPW microstrip array design on PET, fabricated with adhesive copper foil, simulated at 2.68 GHz with 10 dBi gain, and validated by prototype measurements that agree with simulation. No equations, fitted parameters, predictions, or derivation chain are present. Claims rest on direct fabrication and testing rather than any self-referential reduction. No self-citations or ansatzes are invoked in a load-bearing way. This is a self-contained engineering report against external benchmarks (measured S-parameters and patterns).

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

No free parameters, axioms, or invented entities are introduced; the work relies on standard electromagnetic simulation and basic fabrication assumptions common to antenna design.

pith-pipeline@v0.9.0 · 5683 in / 1100 out tokens · 26786 ms · 2026-05-25T17:07:25.720447+00:00 · methodology

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