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arxiv: 2604.04521 · v1 · submitted 2026-04-06 · 💻 cs.IT · math.IT

Recognition: no theorem link

Pinching Antenna Systems (PASS): Enabling Reconfigurable and Controllable Wireless Channels -- A Comprehensive Survey

Elmehdi Illi , Marwa Qaraqe
Authors on Pith no claims yet

Pith reviewed 2026-05-10 19:31 UTC · model grok-4.3

classification 💻 cs.IT math.IT
keywords pinching antennasreconfigurable wireless channelswaveguide antennas6G networkschannel controlphysical layer securityintegrated sensing and communicationmovable antennas
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The pith

Pinching antenna systems link base stations to waveguides with pinch-point antennas to reconfigure wireless channels and bypass line-of-sight and path-loss limits.

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

This paper surveys pinching antenna systems (PASS), in which base-station radio-frequency chains connect to long waveguides carrying one or more radiating antennas pinched at chosen locations. The approach is presented as a way to reshape the wireless channel in response to problems that conventional multi-antenna arrays have not fully solved, such as missing line-of-sight paths and high free-space loss. The survey organizes existing studies by target objectives including coverage, data rate, physical-layer security, sensing, integrated sensing-and-communication, and energy efficiency. It compares the schemes, draws out their practical limits, and identifies open questions for deployment.

Core claim

The paper establishes that PASS extend base-station reach by attaching radio-frequency chains to long waveguides on which radiating antennas are pinched at custom positions. This geometry gives designers direct control over antenna locations and thereby over the resulting propagation channel. The survey reviews how such control supports improved coverage and rates, stronger secrecy, joint sensing and communication, and lower energy use, while cataloging the different system architectures proposed to date.

What carries the argument

Pinching Antenna System (PASS), the arrangement of base-station RF chains connected to extended waveguides with radiating elements pinched at selectable points along the waveguide to tune the wireless channel.

If this is right

  • Antenna placement along the waveguide can be chosen to reduce path loss by bringing radiating elements closer to intended receivers.
  • Channel control through pinch locations can be used to steer energy away from eavesdroppers and raise secrecy rates.
  • The same geometry supports simultaneous sensing and data transmission by shaping the radiated field for both functions.
  • Dynamic repositioning of pinch points offers a route to adaptive coverage without moving the entire base station.
  • Energy efficiency gains arise when shorter propagation distances lower the required transmit power for a target signal strength.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • PASS could be combined with reconfigurable intelligent surfaces to create hybrid channel-control architectures that jointly adjust both transmit and reflect paths.
  • Hardware prototypes would need to demonstrate low-loss waveguide feeds and fast, repeatable pinching mechanisms before large-scale trials become feasible.
  • Standardization work might focus on waveguide length limits, pinch-point precision, and control interfaces that integrate with existing base-station software.
  • Field trials in dense urban canyons or indoor factories would directly test whether the claimed coverage and sensing benefits survive real-world clutter and mobility.

Load-bearing premise

Traditional multi-antenna schemes are inherently unable to improve wireless channel quality without additional channel-altering hardware.

What would settle it

A side-by-side measurement campaign in a non-line-of-sight indoor or urban setting that shows no statistically significant improvement in received power, rate, or secrecy capacity when PASS configurations replace optimized fixed antenna arrays of comparable total aperture and power.

Figures

Figures reproduced from arXiv: 2604.04521 by Elmehdi Illi, Marwa Qaraqe.

Figure 1
Figure 1. Figure 1: Paper organization. as a material for presenting the required background, from an electromagnetic propagation and mathematical modeling perspective of the PA-aided transmission and/or reception. The section also presents the existing models considered so far in the surveyed literature to account for the in-waveguide loss. A. PASS: Electromagnetic Basics and Hardware Design A PASS is generally constituted o… view at source ↗
Figure 2
Figure 2. Figure 2: Illustration of a multi-waveguide multi-PA PASS. [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Illustration of the in-waveguide and free-space propagation phase in a [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗
Figure 5
Figure 5. Figure 5: Illustration of a Center-Fed PASS (C-PASS) [21]. [PITH_FULL_IMAGE:figures/full_fig_p006_5.png] view at source ↗
Figure 4
Figure 4. Figure 4: Illustration of a Segmented Waveguide Pinching Antenna (SWAN) [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗
Figure 6
Figure 6. Figure 6: A pinching-antenna-enabled ISAC system [83]. [PITH_FULL_IMAGE:figures/full_fig_p015_6.png] view at source ↗
read the original abstract

The evolution of wireless networks is driving new paradigms for consideration in upcoming generations. To this end, the 6G anticipates the development of several data-rate-hungry applications, in addition to a forecast growth in sensing-centric applications. Such an evolution, however, is unbalanced on the other side by the accentuated scarcity of spectrum, which opens up urgent needs to develop spectrum-efficient communication and sensing techniques. Due to the inability of the traditional multi-antenna schemes to enhance a wireless channel quality, increasing interest has been paid to wireless channel-altering schemes, such as reconfigurable intelligent surfaces and movable antennas. Recently, a new technique in this category, called pinching antennas (PAs), was introduced and tested. PA systems (PASS) are based on extending the reach of a base station by connecting its radio-frequency chains to long waveguides, on which one or many radiating antennas are pinched at custom positions of interest. Thus, such a technique can provide a means of overcoming several unfavorable channel conditions, such as the absence of a line-of-sight and increased free-space path loss. Importantly, such a channel-tuning feature can provide notable enhancements in terms of sensing, network coverage, data rate, and resilience against eavesdropping. In this work, we provide a comprehensive review of research on PASS, designed to meet various system design objectives, such as network coverage and data rate, information-theoretically secure transmission, sensing, integrated sensing and communication, and energy efficiency. A categorization of the surveyed work is established by comparing the various PASS schemes presented. Several takeaways are illustrated on the proposed schemes' potential and limitations, along with several directions forward discussed, in terms of future deployment and implementation.

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. This survey paper reviews Pinching Antenna Systems (PASS), a technique that extends base-station RF chains via long waveguides with one or more radiating antennas pinched at custom positions. It categorizes existing work on PASS for objectives including network coverage and data rate, information-theoretically secure transmission, sensing, integrated sensing and communication, and energy efficiency; the paper also provides comparative takeaways on the schemes' potential and limitations plus directions for future deployment.

Significance. If the literature coverage is complete and the analysis balanced, the survey would be a useful early reference for an emerging 6G channel-reconfiguration approach that offers positional flexibility beyond fixed arrays or RIS. The explicit categorization and listed takeaways could help organize subsequent research on coverage, secrecy, and ISAC use cases.

major comments (2)
  1. [Abstract] Abstract: The opening claim that interest in channel-altering schemes stems from 'the inability of the traditional multi-antenna schemes to enhance a wireless channel quality' is overstated. MIMO beamforming, massive MIMO, and adaptive arrays are established to deliver array gain, combat fading, and raise capacity under the same conditions (no LoS, path loss) that the survey attributes to PASS. Because this premise frames the entire motivation and categorization of PASS as addressing otherwise intractable gaps, the survey should qualify or correct the statement and explicitly delineate what PASS uniquely enables versus conventional MIMO.
  2. [Categorization and takeaways] Categorization and takeaways sections: The paper must supply a systematic comparison table or matrix that places each surveyed PASS scheme against both (i) conventional multi-antenna baselines and (ii) other channel-altering methods (RIS, movable antennas) on the same performance metrics (coverage probability, secrecy rate, sensing accuracy). Without such side-by-side quantification, the claim that PASS provides 'notable enhancements' remains qualitative and the proposed categorization loses discriminatory power.
minor comments (2)
  1. [Abstract / Introduction] The abstract and introduction should define 'pinching' and the waveguide architecture with a simple diagram or equation (e.g., position-dependent radiation pattern) on first use, rather than deferring the description.
  2. [References] Ensure the reference list is exhaustive for the 2023-2024 PASS literature; any omitted early works on waveguide-based pinching should be added with a brief justification.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive and detailed feedback on our survey paper. We agree that the abstract requires qualification and that a quantitative comparison table would strengthen the analysis. We address each major comment below and will incorporate the suggested revisions.

read point-by-point responses

  1. Referee: [Abstract] Abstract: The opening claim that interest in channel-altering schemes stems from 'the inability of the traditional multi-antenna schemes to enhance a wireless channel quality' is overstated. MIMO beamforming, massive MIMO, and adaptive arrays are established to deliver array gain, combat fading, and raise capacity under the same conditions (no LoS, path loss) that the survey attributes to PASS. Because this premise frames the entire motivation and categorization of PASS as addressing otherwise intractable gaps, the survey should qualify or correct the statement and explicitly delineate what PASS uniquely enables versus conventional MIMO.

    Authors: We acknowledge that the abstract phrasing is overstated and could imply that conventional MIMO provides no benefits, which is incorrect. MIMO and massive MIMO are established techniques for array gain and fading mitigation. PASS, however, provides a distinct form of channel reconfiguration through the flexible positioning of pinched antennas along waveguides, enabling dynamic optimization of antenna locations to address specific non-LoS or high path-loss scenarios without requiring physically large arrays. We will revise the abstract to qualify the original statement, acknowledge the strengths of traditional multi-antenna schemes, and explicitly delineate PASS's unique contributions, such as positional flexibility and reduced hardware overhead for certain deployments. revision: yes

  2. Referee: [Categorization and takeaways] Categorization and takeaways sections: The paper must supply a systematic comparison table or matrix that places each surveyed PASS scheme against both (i) conventional multi-antenna baselines and (ii) other channel-altering methods (RIS, movable antennas) on the same performance metrics (coverage probability, secrecy rate, sensing accuracy). Without such side-by-side quantification, the claim that PASS provides 'notable enhancements' remains qualitative and the proposed categorization loses discriminatory power.

    Authors: We agree that a side-by-side comparison table would make the analysis more rigorous and help readers assess the relative merits of PASS. Although the original works do not always report identical metrics, we will add a new table in the categorization section that aggregates the performance figures (e.g., coverage probability, secrecy rate, sensing accuracy) reported for each PASS scheme and contrasts them with representative values from conventional MIMO, RIS, and movable-antenna literature. This will render the 'notable enhancements' more quantitative while preserving the existing textual takeaways. revision: yes

Circularity Check

0 steps flagged

Survey paper contains no derivations or fitted predictions

full rationale

This is a literature review surveying existing PASS research with no original equations, models, or predictions. The abstract motivation statement regarding traditional multi-antenna schemes is a framing claim, not a derivation that reduces to its own inputs by construction. No self-citations, ansatzes, or fitted parameters are used in a load-bearing circular manner. The paper is self-contained as a summary of prior work.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

As a survey paper the work introduces no free parameters, axioms, or invented entities; it summarizes prior literature on PASS without adding new theoretical constructs.

pith-pipeline@v0.9.0 · 5610 in / 1111 out tokens · 37747 ms · 2026-05-10T19:31:48.969099+00:00 · methodology

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Reference graph

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