3D multi-sector vivaldi antennas based on metallized plastic technology

Thevenard, Julian; Tong, Dominique Lo Hine; Louzir, Ali; Nicolas, C.; Person, Christian; Coupez, Jean-Philippe

doi:10.1109/aps.2007.4396882

Cited by 9 publications

(7 citation statements)

References 7 publications

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“…The simulated peak antenna gain is higher than EICITA/MBRAI recommendations. The next step will be the prototyping of the antenna by comparing several technologies such as 3D metal sheets and MID technology [9].…”

Section: Resultsmentioning

confidence: 99%

Ultra-miniature UHF antenna for nomadic device

Minard

Pintos

Louzir

2010

2010 IEEE Antennas and Propagation Society International Symposium

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IntroductionMore and more wireless applications, dedicated to nomadic and mobile devices, operating in the UHF frequency band, are expected in the coming years. They include digital terrestrial TV broadcast (DVB-T/H, MediaFlo) or new communication applications using the UHF spectrum resulting from the digital dividend and based on technologies such as WiMAX of future generation of cellular networks. [1,2]. However, considering the antenna recommendations from the EICTA/MBRAI [3], designing a compact antenna for small devices is a real challenge. Several technologies are already used to address such a problematic: 3D metallic shapes [4], use of substrate material with high dielectric constant, use of broadband or tunable matching network and tunable components [5]. In this paper, a new design based on the twisted slot antenna [6,7] is proposed covering the full UHF band . Realized on a 130*230mm 2 PCB board, the design combines artifacts such as folding the metallic shape using the third dimension and using a tunable component for frequency tunability in order to cover the full UHF band. The achieved ultra-miniature antenna size is lower than λ 0 /51* λ 0 /118* λ 0 /138 at the lowest frequency for a simulated peak antenna gain higher than EICTA/MBRAI recommendations. Principle of the Twisted Slot AntennaThe radiating slot antennas are now used in various applications [6,7]. One major advantage is their easy and low cost etching on a PCB in the same manufacturing flow than the RF part by removing a part of the ground plane. For portable/nomadic devices operating in the UHF band, a straight resonating slot (size ~λ g /2) is too long to be integrated on a PCB with a small size factor and including other electrical functions. As sketched in Figure 1a the meandering of the slot leads to the reduction of the antenna efficiency due to E field cancellation. In [6], it has been proposed to compact the slot antenna by meandering it while keeping good radiation efficiency. Indeed the radiated E field is associated to current orientations, reversing the current direction leads to reversing the radiated E field. A sort of bridge is added in the half guided wavelength slot (called the short circuit slot (SCS)) to reverse the electric fields of the slot, as shown in Figures 1b and 1c. A cut slot (called open circuit slot (OCS) is necessary in the ground plane on both sides of the SCS in order to not short-circuit the reversed E fields. Twisted Slot Antenna in UHF bandStarting from the U shaped twisted slot design shown in Figure 2, a more compact structure is proposed. Placed in a corner of the PCB, the SCS is folded along the length of the OCS. In addition, only one part of the OCS is extended (the other length of the OCS is very small). The U shaped slot is designed in the UHF band (with HFSS) on a 130*230mm 2 FR4 substrate ( Figure 2) with thickness of 1.4mm. The real and imaginary 978-1-4244-4968-2/10/$25.00 ©2010 IEEE parts of its impedance show two resonances (Figure 3-a /green curve). The best radiation efficiency is obta...

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Section: Resultsmentioning

confidence: 99%

Ultra-miniature UHF antenna for nomadic device

Minard

Pintos

Louzir

2010

2010 IEEE Antennas and Propagation Society International Symposium

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“…Monopole and slot Yagi-Uda arrays achieved high gain more than 10 dBi in [10]- [11]. A 4-sector Vivaldi antenna was designed to achieve a 50% bandwidth and a 6 dBi gain in [12]. Nevertheless, there is no suitable design of multi-sector antennas with wide bandwidth, high gain and low profile, that can be readily mounted on a moving platform.…”

Section: Introductionmentioning

confidence: 98%

“…Multi-sector antennas using a dedicated antenna for each sector can simply fulfil both requirements of coverage and high gain [10]- [12]. Monopole and slot Yagi-Uda arrays achieved high gain more than 10 dBi in [10]- [11].…”

Section: Introductionmentioning

confidence: 98%

A Four-Element Array of Wideband Low-Profile H-Plane Horns

Yang

Shen

et al. 2015

IEEE Trans. Veh. Technol.

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A wideband wide-coverage H-plane horn array with vertical polarization is proposed. Due to its light weight and low profile, the designed array is suitable for applications in spectrum monitoring systems on moving platforms. The switched-beam symmetrical array consists of four identical short H-plane horns. Pattern deterioration occurring in high frequency range is solved by inserting two pins in each horn. The measured impedance bandwidth is almost 100% for VSWR<2 owing to its fed structure with a thick-cylinder-loaded probe. The measured azimuth-plane beamwidth is about 90° over the entire frequency range from 860 MHz to 2500 MHz. Moreover, the measured results with the corresponding simulated ones are presented and discussed in this paper.Index Terms-H-plane horn, spectrum monitoring system, vehicular application, wide-band, wide-coverage. 0018-9545 (c)

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“…Ever since a variety of three-dimensional (3D) manufacturing processes, such as 3D printing, have been developed and commercialized, metallization of 3D workpieces has been in high demand. − A crucial research question to fulfill in this field is how to achieve metal coating at selected areas of 3D structures, such as the internal surfaces of hollow structures like capillary tubes. For area-selective metallization, conventionally, a mask is introduced over the workpiece (mostly polymers are used for this purpose) by photolithography or screen printing and metal coating over the mask is undertaken. − However, we cannot adopt these masking technologies for complex 3D workpieces because they are planar and adaptable only for external surfaces.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical System Encapsulated by Nanoscale Liposomes Enabling On-Demand Triggering of Electroless Deposition at Selected Areas

Zhan

Lin

Arai

et al. 2020

ACS Appl. Nano Mater.

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This study proposed and demonstrated an application for nanoscale thermosensitive liposomes: encapsulating chemicals (reducing agents or metal ions) to physically separate reducing agents from metal ions and temporarily prevent spontaneous reduction of the metal ion (i.e., deposition of the metal or electroless deposition). With such an electrochemical system encapsulated by nanoscale liposomes, we can trigger electroless deposition at areas of interest by heating on demand, which enables metallization at selected surface areas. We used 1,2dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) as the lipid to synthesize thermosensitive liposomes (gel-to-liquid-crystalline phase transition temperature at 40 °C) encapsulating hypophosphite (the reducing agent),and mixed it with a PdCl 2 solution. The liposomes stably held the reducing agent for 160 days as long as it was stored in a fridge at 3 °C. When the temperature exceeded the phase transition temperature, the reducing agent was released from the liposomes and induced Pd deposition. This electroless deposition system encapsulated by thermosensitive liposomes was applied to metalize selected spots of the internal surface of a glass capillary tube: the mixture was injected into the tube and several spots were heated externally, and Pd metal was deposited at the spots. Furthermore, we succeeded in microscopically visualizing a single liposome thermally releasing the reducing agent and inducing metal deposition locally. Overall, on-demand triggering of electroless deposition can be accomplished by applying thermosensitive liposomes was demonstrated to be feasible. This new electrochemical system using nanoscale liposomes can be used to achieve metal coatings on various surfaces of interest.

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3D multi-sector vivaldi antennas based on metallized plastic technology

Cited by 9 publications

References 7 publications

Ultra-miniature UHF antenna for nomadic device

Ultra-miniature UHF antenna for nomadic device

A Four-Element Array of Wideband Low-Profile H-Plane Horns

Electrochemical System Encapsulated by Nanoscale Liposomes Enabling On-Demand Triggering of Electroless Deposition at Selected Areas

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