Increase of Input Resistance of a Normal-Mode Helical Antenna (NMHA) in Human Body Application

Zainudin, Norsiha; Latef, Tarık Abdul; Aridas, Narendra Kumar; Yamada, Yoshıhıde; Kamardin, Kamilia; Rahman, Nurul Huda Abd

doi:10.3390/s20040958

Cited by 9 publications

(2 citation statements)

References 31 publications

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“…Figure 4 presents the high-impedance plot of the helical antenna, which causes the load mismatch attenuation. During the initial phase of the normal-mode helical antenna (NMHA) design, the focus was on evaluating its bandwidth as a passive radiator while considering the mismatch losses that reduce the gain of the antenna [15]. Measurements in a non-reflective environment were conducted at each desired frequency within the range 20-30 MHz using the Nano VNA-FV2 network analyzer [16].…”

Section: The Normal-mode Helical Antenna Design Considerationsmentioning

confidence: 99%

Low-Profile Circularly Polarized HF Helical Phased Array: Design, Analysis, and Experimental Evaluation

Constantinides,

Kousioumari,

Najat

et al. 2024

Applied Sciences

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This paper presents the design, development, and performance evaluation of a compact wideband phased array active helical antenna for monitoring HF interference. Traditional multi-element HF antenna designs are often subjected to size restrictions. The front-to-back ratio of the proposed circularly polarized phased array exceeds 20 dB across the operating range. This array enables the simultaneous monitoring of vertically and horizontally polarized signals, offering a practical alternative to larger antennas, particularly in space-constrained scenarios. Through advanced low-noise amplifier design, efficiency and bandwidth are optimized while mitigating mutual coupling effects. Optimal beamformer design enhances array performance with respect to more traditional array design approaches. The test results verify exceptional performance with an average axial ratio of 2 dB and a high front-to-back ratio beyond the desired frequency range. This study offers valuable insights into the design and deployment of compact wideband phased array antennas, providing an effective solution for monitoring HF interference.

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Section: The Normal-mode Helical Antenna Design Considerationsmentioning

confidence: 99%

Low-Profile Circularly Polarized HF Helical Phased Array: Design, Analysis, and Experimental Evaluation

Constantinides,

Kousioumari,

Najat

et al. 2024

Applied Sciences

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“…Conventional BLCs are characterized by large dimensions as they consist of two orthogonal pairs of 90° transmission lines (TLs). Miniaturization is an important pre-requisite to facilitate the application of couplers in modern communication systems, such as portable [ 9 , 10 ], or wearable electronics [ 11 , 12 ], but also Internet of Things (IoT) devices [ 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Low-Cost Automated Design of Compact Branch-Line Couplers

Bekasiewicz

2020

Sensors

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Branch-line couplers (BLCs) are important components of wireless communication systems. Conventional BLCs are often characterized by large footprints which make miniaturization an important pre-requisite for their application in modern devices. State-of-the-art approaches to design compact BLCs are largely based on the use of high-permittivity substrates and multi-layer topologies. Alternative methods involve replacement of transmission-line sections of the circuit, with their composite counterparts, referred to as compact cells (CCs). Due to the efficient use of available space, CC-based couplers are often characterized by small footprints. The design of compact BLCs is normally conducted based on engineering experience. The process is laborious and requires many adjustments of topology followed by manual or, semi-automatic tuning of design parameters. In this work, a framework for low-cost automated design of compact BLCs using pre-defined CCs is proposed. The low cost of the presented design technique is ensured using equivalent-circuit models, space mapping correction methods, and trust-region-based local optimization algorithms. The performance of the framework is demonstrated based on three examples, concerning the design of unequal-power split coupler, comparison of automatically generated compact BLCs, as well as rapid re-design of the coupler for different substrates. Furthermore, the approach has been benchmarked against the state-of-the-art methods for low-cost design of circuits.

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Implantable small ultra-wideband circularly polarized antenna design for continuous blood pressure monitoring

Song,

Zheng,

Shi

et al. 2024

Sci Rep

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Increase of Input Resistance of a Normal-Mode Helical Antenna (NMHA) in Human Body Application

Cited by 9 publications

References 31 publications

Low-Profile Circularly Polarized HF Helical Phased Array: Design, Analysis, and Experimental Evaluation

Low-Profile Circularly Polarized HF Helical Phased Array: Design, Analysis, and Experimental Evaluation

Low-Cost Automated Design of Compact Branch-Line Couplers

Implantable small ultra-wideband circularly polarized antenna design for continuous blood pressure monitoring

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