A Novel Approach Using an Inductive Loading to Lower the Resonant Frequency of a Mushroom-Shaped High Impedance Surface

Gu, Minyu; Vorobiev, Daniel; Kim, Woo Seok; Chien, H. H.; Woo, Hyun-Myung; Hong, Sung Cheol; Park, Sung Il

doi:10.2528/pierm19110607

Cited by 4 publications

(7 citation statements)

References 11 publications

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“…An Agilent E5062A network analyzer is connected to vertical and parallel pairs of the probe antennas to measure transmission coefficients of TM and TE waves propagating from the left end to the right end of the surface. Due to the nature of TM and TE surface waves, measurements of each wave require a different measurement setup [1,14]. In TM propagation, the electric field extends vertically out of the surface, and measurements of TM waves require a pair of monopole antennas normal to the surface, as shown in Figure 7(b).…”

Section: Experiments Resultsmentioning

confidence: 99%

“…As shown in Figure 1, a multi-turn SSLL is additionally inserted between sub vias. Simulated and experimental results reveal that the insertion of SSLL leads to a dramatic downward shift in the resonant frequency (the three-layered HIS [14]: 3.69 GHz, the proposed structure: 1.36 GHz) at given dimensions (5 mm by 5 mm). Here, we also provide an analytical model of the proposed HIS, and it is in good agreement with a numerical approach.…”

Section: Introductionmentioning

confidence: 97%

“…Moreover, reductions in resonant frequency of their structures are modest. In [14], we proposed a new approach, inductive loading, employing a 3-D inductor. Here, a long single via is replaced by short multiple sub-vias, and thereby current paths are extended.…”

Section: Introductionmentioning

confidence: 99%

“…Here, we also provide an analytical model of the proposed HIS, and it is in good agreement with a numerical approach. [14], and (c) the proposed HISs.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Design of an Inductive Spiral-Loop Loaded Unit Cell in a Mushroom-Shaped High Impedance Surface for Sub-GHZ Applications

Hong¹,

Kim²,

Park³

2021

PIER M

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A high impedance surface has far-reaching potential in wireless applications, but realization of the surface operating at sub-GHz ranges is challenging due to its size limits in practical applications. Here, we present a novel inductive technique based on multi-turn square spiral loops. The introduction of the spiral loops to a mushroom-shaped high impedance surface provides additional current path, thereby results in a dramatic increase in its total inductance at given dimensions, and therefore leads to a significant reduction in a resonant frequency of a high impedance plane. Electromagnetic simulation results reveal that a resonant frequency shifts downward 1 GHz at a given dimension, and they are in good agreement with results from an analytical model for the proposed structure. Experimental measurements suggest the feasibility of the proposed approach.

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Section: Experiments Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

“…Here, we also provide an analytical model of the proposed HIS, and it is in good agreement with a numerical approach. [14], and (c) the proposed HISs.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design of an Inductive Spiral-Loop Loaded Unit Cell in a Mushroom-Shaped High Impedance Surface for Sub-GHZ Applications

Hong¹,

Kim²,

Park³

2021

PIER M

Self Cite

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“…The devices resonate when the resonant frequency is matched to that of the TX system. This results in more efficient energy harvesting [ 30 , 31 , 32 ]. Moreover, the dual coil TX system offers high quality (Q) factors compared with the modest Q factor of the single-coil TX system ( Figure 4 a) [ 29 , 33 ].…”

Section: Resultsmentioning

confidence: 99%

Fully Implantable Low-Power High Frequency Range Optoelectronic Devices for Dual-Channel Modulation in the Brain

Kim

Jeong

Hong

et al. 2020

Sensors

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Wireless optoelectronic devices can deliver light to targeted regions in the brain and modulate discrete circuits in an animal that is awake. Here, we propose a miniaturized fully implantable low-power optoelectronic device that allows for advanced operational modes and the stimulation/inhibition of deep brain circuits in a freely-behaving animal. The combination of low power control logic circuits, including a reed switch and dual-coil wireless power transfer platform, provides powerful capabilities for the dissection of discrete brain circuits in wide spatial coverage for mouse activity. The actuating mechanism enabled by a reed switch results in a simplified, low-power wireless operation and systematic experimental studies that are required for a range of logical operating conditions. In this study, we suggest two different actuating mechanisms by (1) a magnet or (2) a radio-frequency signal that consumes only under 300 µA for switching or channel selection, which is a several ten-folds reduction in power consumption when compared with any other existing systems such as embedded microcontrollers, near field communication, and Bluetooth. With the efficient dual-coil transmission antenna, the proposed platform leads to more advantageous power budgets that offer improved volumetric and angular coverage in a cage while minimizing the secondary effects associated with a corresponding increase in transmitted power.

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Design and Analysis of Fractal-Shaped High-Impedance Surface Unit Cell Characteristics

et al. 2023

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Fractal geometries consistently provide solutions to several electromagnetic design problems. In this paper, fractal geometries such as Hilbert and Moore curves are used to design efficient High-Impedance Surfaces. Modern communication devices have many sensors that are needed to communicate wirelessly. The critical component of wireless communications is antennas. Planar microstrip patch antennas are popular due to their low profile, compactness, and good radiation characteristics. The structural disadvantages of microstrip antennas are that they have surface waves that propagate over the ground plane. High-Impedance Surface (HIS) planes are a prominent solution to minimize and eliminate surface waves. The HIS structures behave as active LC filters that suppress surface waves at their resonance frequency. The resonance frequency of the structure is obtained by its LC equivalent or by analyzing the reflection phase characteristics. This work presents conventional HIS structures similar to mushroom HIS and fractal HIS such as Hilbert curve and Moore curve HIS. The HIS reflection phase characteristics are obtained by applying periodic boundary conditions with plane wave illumination. The results were obtained in terms of the reflection phase angle. The conventional mushroom structures show narrow band characteristics at given dimensions of 10 mm × 10 mm and 20 mm × 20 mm. These structures are helpful in the replacement of PEC ground planes for patch antennas under sub-6 GHz. The Hilbert and Moore fractals are also designed and have a multiband response that can be useful for L, S, and C band applications. Another design challenge of HIS is protrusions, which make design difficult. The work also presents the effect of having vias and the absence of vias on reflection phase characteristics. The response shows the least and no significant effect of vias under the x-band operation.

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A Novel Approach Using an Inductive Loading to Lower the Resonant Frequency of a Mushroom-Shaped High Impedance Surface

Cited by 4 publications

References 11 publications

Design of an Inductive Spiral-Loop Loaded Unit Cell in a Mushroom-Shaped High Impedance Surface for Sub-GHZ Applications

Design of an Inductive Spiral-Loop Loaded Unit Cell in a Mushroom-Shaped High Impedance Surface for Sub-GHZ Applications

Fully Implantable Low-Power High Frequency Range Optoelectronic Devices for Dual-Channel Modulation in the Brain

Design and Analysis of Fractal-Shaped High-Impedance Surface Unit Cell Characteristics

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