A Tunable, High-Gain, Very Low-Profile Composite Monopole Antenna for Low-Frequency Applications

Rao, Menglou; Sarabandi, Kamal

doi:10.1109/tap.2018.2826653

Cited by 16 publications

(5 citation statements)

References 23 publications

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“…Thus, we were limited to utilizing baluns composed of conventional transformers due to their broadband operation and low losses at the frequencies of interest. The balun was constructed by cascading four transformers (as in [19]-see the inset of Figure 1b) and connected at the input and output of the system. Once connected, the system became balanced and immune to the aforementioned problems.…”

Section: Frequency Responsementioning

confidence: 99%

Characterization of a resonant capacitively coupled wireless power transfer system for communication purposes at 6 MHz

Belau

Domingos

Freitas

et al. 2021

IET Science Measure & Tech

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This work characterizes a wireless power transmission (WPT) system operating at the 6 MHz frequency band for wireless information transfer purposes. To perform the characterization, the channel is modelled using its 2-port network scattering parameters. Then, a long string of symbols encoded with on-off keying and modified Miller encoding is passed through the channel model at various data rates. The original data is recovered from the channel output signal using a software-defined receiver. Bit error rate curves and eye diagrams are created for each encoding scheme and data rate. To verify the simulated results, the aforementioned data strings are transferred through the actual WPT system and output signals are post-processed in the digital domain with the same software-defined receiver. For comparison purposes, the performance of the WPT channel is compared to that of a conventional wireless communication channel with a flat additive white Gaussian noise model. The simulation and measurement results demonstrate that the provided WPT system can be used for data transfer with an acceptable error rate. 1 INTRODUCTION With emerging advances in RFID, wireless sensor networks (WSN), and biomedical implants, there is a push for systems that are able to power up batteryless devices and enable bidirectional communication with them [1] in order to send control signals and receive sensor data. However, wireless power transfer (WPT) and wireless communication/information transfer (WIT) differ in the metrics that each attempts to maximize [2]. WPT attempts to transfer maximum power with high efficiency, which often requires highly resonant (high Q) structures to increase power output [3, 4]. On the other hand, WIT attempts to increase data rate, which requires large bandwidths. Thus, there are two opposing design parameters: highly resonant but narrowband designs for WPT and wideband designs for wireless communication. This trade-off motivates designs in which WPT and WIT are separated either spatially [5] (such that each purpose has its own set of antennas) or in frequency as in [6-8]. This separation in designs is effective but requires dedicated hardware for each purpose. Thus, there is merit in having a This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Frequency Responsementioning

confidence: 99%

Characterization of a resonant capacitively coupled wireless power transfer system for communication purposes at 6 MHz

Belau

Domingos

Freitas

et al. 2021

IET Science Measure & Tech

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“…However, when end-fire antennas are composed of traditional monopoles for VP, they usually exhibit a high profile close to λ 0 =4, which is extremely undesirable in low-profile applications. 6 Therefore, the design of a compact VP 433-MHz planar end-fire antenna becomes a big challenge. A combination of multiple top-hat monopoles with mixing electromagnetic properties could act as a suitable method to address the problems mentioned above.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, an end‐fire antenna with VP is increasingly demanded so as to combat propagation loss. However, when end‐fire antennas are composed of traditional monopoles for VP, they usually exhibit a high profile close to

{normalλ}_{0} / 4

, which is extremely undesirable in low‐profile applications 6 . Therefore, the design of a compact VP 433‐MHz planar end‐fire antenna becomes a big challenge.…”

Section: Introductionmentioning

confidence: 99%

Narrow transverse‐size compact vertically polarized end‐fire antenna using dual‐hat composite elements

Guo

2022

Int J RF Mic Comp-Aid Eng

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A narrow transverse-size compact end-fire antenna with vertical polarization (VP) is presented in this paper. The antenna working in the 433 MHz band is constructed based on a dual-hat composite element, which consists of a rectangular and a pentagon top hat. This is operated in terms of capacitive coupling and inductive loading. Two dual-hat composite elements are, respectively, applied as the driven and the reflector elements in a Yagi array layout, and they are arranged in a noncommon ground manner. The main radiators are the posts with VP radiation fields, which are readily affected by electromagnetic coupling from the adjacent elements. The radiation fields are constructively guided and overlapped to generate an end-fire radiation. The resonant length of the antenna is stretched due to a folded current path with a reduced profile height. The measured jS 11 j < À10 dB impedance bandwidth (IMBW) for the fabricated antenna ranges from 419 to 444 MHz (5.7%) and the measured end-fire peak gain can go up to 2.2 dBi at 433 MHz. The antenna dimensions can be maintained at 0.37λ 0 Â 0.16λ 0 Â 0.051λ 0 , where λ 0 is the free-space wavelength at the center frequency. It exhibits narrow transverse size and compact structure.

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“…The volume of work done for lower VHF band ESAs is relatively small. The available designs are mostly of the conventional monopole or loop type [11,12] having a low gain. As shown in [13], various techniques like slot loading, meander line, fractal, lumped element loading etc.…”

Section: Introductionmentioning

confidence: 99%

Electrically small hemi‐cylindrical‐shaped multilayered very high frequency antenna for underground mine communication

Dash

Kalva

Reddy

et al. 2020

IET Microwaves, Antennas & Propagation

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This study presents the design of an efficient, moderately high gain and portable antenna operating at 58.27 MHz. The proposed antenna is a multilayered hemi‐cylindrical shaped structure, which works on the principle of resonant inductive coupling using a multi‐turn loop. An equivalent circuit, which takes into account the near field coupling effects, is also developed. The proposed antenna is electrically small with a finite ground plane with ka≃0.28 and has an overall volume of 0.038λ0 × 0.058λ0 × 0.058λ0. The antenna exhibits a gain of 3.43 dBi and an efficiency of 92.5% as obtained from measured results at the resonant frequency. The measured fractional bandwidth and the Qratio of the antenna are 0.547 and 8.647%, respectively. The results obtained from electromagnetic simulation matches with that obtained from the equivalent circuit and the measured results. The antenna can operate at the lower very high frequency (VHF) frequency range for applications, which require electrically small portable antennas such as underground mine communication.

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A Tunable, High-Gain, Very Low-Profile Composite Monopole Antenna for Low-Frequency Applications

Cited by 16 publications

References 23 publications

Characterization of a resonant capacitively coupled wireless power transfer system for communication purposes at 6 MHz

Characterization of a resonant capacitively coupled wireless power transfer system for communication purposes at 6 MHz

Narrow transverse‐size compact vertically polarized end‐fire antenna using dual‐hat composite elements

Electrically small hemi‐cylindrical‐shaped multilayered very high frequency antenna for underground mine communication

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