Design and Characterization of Meshed Microstrip Transmission Lines

Silva, Zachary J.; Valenta, Christopher R.; Durgin, Gregory D.

doi:10.1109/mwsym.2019.8700894

Cited by 12 publications

(7 citation statements)

References 9 publications

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“…The effective dielectric constants can be calculated as described in [23], however they need to be modified to account for the meshing. To do this the filling factor Ψ is used [24]. It is defined by;…”

Section: Surface Current Distribution and Equivalent Circuitmentioning

confidence: 99%

Meshed Stacked LTCC Antenna for Space Application

Ahmad

Olule

2022

IEEE Access

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Meshed conductors have been used to realize antenna systems. Previous studies have concentrated on single layer patch designs. In this paper, different mesh configurations of stacked meshed patch antennas are studied; when both patches are meshed, when only the top patch is meshed, when only the bottom patch is meshed and when both patches are continuous solid metal. In addition, the effect of conventional slot loading on stacked mesh patches is also investigated through parametric studies. The designs are fed by coaxial feed probe in the lower patch. The results showed that the stacked mesh performance in terms of the resonant frequency, return loss, gain and radiation efficiency can be comparable to that of a typical continuous metal stacked design. Both patches are 20.86 mm x 21.46 mm. The maximum absolute gain and radiation efficiency of the solid stacked patch were 5.05 dBi and 91.6% while those of the meshed stacked patch were 5.22 dBi and 91.8% respectively. The measurements of the antenna with two stacked meshed patches showed that the antenna was resonant at 2.52 GHz with a reflection coefficient in dB of -23.69 dB. It has a 40 MHz -10 dB impedance bandwidth (1.5%) from 2.50 GHz to 2.54 GHz. The antenna exhibited a maximum measured gain of -0.12 dBi and cross polarization of 10 dB at boresight. An equivalent circuit model for the design is also proposed. The antenna is developed for space application and therefore it was implemented using Low Temperature Co-fired Ceramic (LTCC) technology as the LTCC properties can withstand the harsh environment of space. Although the meshed lines increase the line impedance and therefore can results in increased losses, this can be mitigated by careful mesh selection. Lastly, the meshed design allows for better bonding between the LTCC tape layers.

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Section: Surface Current Distribution and Equivalent Circuitmentioning

confidence: 99%

Meshed Stacked LTCC Antenna for Space Application

Ahmad

Olule

2022

IEEE Access

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“…The non-linear region corresponds to the effective range of characteristic impedances from 52  to 129 , i.e., between 60 m and 420 m. Note that this non-linear variation occurs because rhombus-shaped pixels create zigzag patterns along the edges of transmission lines, which can be distinguished from the square mesh case in [29]. This filling factor  also defines transparency as T = 1   and plays a key role in our empirical formulas to characterize electromagnetic properties of thin-metal mesh transmission lines.…”

Section: Characteristic Impedance Adjustment a Empirical Formulasmentioning

confidence: 99%

Characteristic Impedance Adjustment of Thin-Metal Mesh Transmission Lines for mmWave Display-Integrated Antennas

et al. 2021

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This paper proposes four methods and empirical formulas of adjusting characteristic impedances for thin-metal mesh transmission lines. The characteristic impedances are discretely adjusted by changing the number and the size of unit meshes, which provides macro-tuning capability, and the discrete values can be tuned more precisely by varying the thin-metal line width and the aspect ratio of mesh geometry. The validity of proposed methods is confirmed by full-wave numerical simulations, and the simulated impedance variations are well-described by our empirical formulas. For further verifications, 26 distinguished samples of thin-metal mesh transmission lines and a 28-GHz thin-metal mesh antenna are fabricated, and their characteristics are measured in millimeter-wave spectrums. The measured results confirm that the proposed methods and empirical formulas can provide accurate and more flexible design rules for impedance adjustment, which allows potential advances in display-integrated antenna applications.

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“…where W t is the trace width and W G is the size (length and width) of the gaps. This definition of an antenna's transparency is widely used and represents the ratio of metal-to-gaps [24]- [26], [29], [34], [35]. Therefore, the transparency of the antenna (mesh density) can also be regarded as the percentage of material reduction compared to a solid antenna.…”

Section: B Meshed Antenna Designmentioning

confidence: 99%

“…In addition, the effects of solar cell parameters on a microstrip patch were investigated using a meshed patch [28]. Furthermore, the impact of mesh fill-factors on a microstrip line's impedance, over a solid ground plane, were analyzed [29]. Nevertheless, there has been no investigation of a high-impedance antenna, typical for antenna-rectifier codesign [30] or RFID applications [23], based on a meshed geometry.…”

Section: Introductionmentioning

confidence: 99%

Meshed High-Impedance Matching Network-Free Rectenna Optimized for Additive Manufacturing

Wagih

Weddell

Beeby

2020

IEEE Open J. Antennas Propag.

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Additive manufacturing using direct-write or screen printing represent low-waste methods for fabricating antennas on low-cost flexible substrates. To realize rectennas using low-resolution printing methods, high-impedance antennas with simple printable geometries are required. This article proposes an electrically-small (0.212×0.212λ 2 ) folded dipole antenna design with a scalable impedance for directly matching energy harvesting rectifiers. The antenna is demonstrated in a high-efficiency sub-1 GHz rectenna, with varying mesh fill-factors for optical transparency. The proposed solid (non-transparent) and meshed (70%-transparent) rectennas achieve a Power Conversion Efficiency (PCE) of over 70% and 60% from sub-1 μW/cm 2 power densities, at 940 and 920 MHz, respectively. This represents a 37% improvement in the PCE over state-of-the-art flexible rectennas while maintaining the smallest electrical size and simplest design by not requiring a matching network. The 70%-transparent rectenna's performance is investigated in real-life use-cases showing its suitability for ambient RF energy harvesting with over 500 mV DC output from a phone-call.INDEX TERMS Antennas, dipole antennas, microstrip antennas, printed antennas, rectennas, rectifiers, RF energy harvesting, transparent antennas, wireless power transfer.

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Design and Characterization of Meshed Microstrip Transmission Lines

Cited by 12 publications

References 9 publications

Meshed Stacked LTCC Antenna for Space Application

Meshed Stacked LTCC Antenna for Space Application

Characteristic Impedance Adjustment of Thin-Metal Mesh Transmission Lines for mmWave Display-Integrated Antennas

Meshed High-Impedance Matching Network-Free Rectenna Optimized for Additive Manufacturing

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