High gain/bandwidth off-chip antenna loaded with metamaterial unit-cell impedance matching circuit for sub-terahertz near-field electronic systems

Alibakhshikenari, Mohammad; Virdee, Bal S.; Mariyanayagam, Dion; Vadalà, Valeria; Naser‐Moghadasi, Mohammad; See, Chan Hwang; Dayoub, Iyad; Aı̈ssa, Sonia; Livreri, Patrizia; Burokur, Shah Nawaz; Pietrenko‐Dabrowska, Anna; Falcone, Francisco; Koziel, Slawomir; Limiti, Ernesto

doi:10.1038/s41598-022-22828-3

Cited by 5 publications

(5 citation statements)

References 26 publications

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“…Namun pada penelitian tersebut tag RFID bisa saja disalahgunakan oleh pihak yang tidak bertanggung jawab, karena pemilik tag yang asli tidak dapat diketahui oleh sistem. RFID juga dapat di-extend dengan radio extender atau antenna (Alibakhshikenari, dkk, 2022), sehingga perlu penambahan two-factor authentication (Ghaffari, dkk, 2021) (Ignacio, dkk, 2022). Hal tersebut dapat diatasi dengan menambahkan fitur capture citra yang dapat dilakukan oleh ESP32-Cam.…”

Section: Pendahuluanunclassified

Sistem Presensi dengan Fitur RFID dan Capture Citra menggunakan NodeMCU dan ESP32-Cam

PRAKASA¹,

SYAFITRI²

2023

ELKOMIKA

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ABSTRAKPada masa pandemi COVID-19, presensi dengan kontak fisik sangat tidak disarankan karena dapat meningkatkan penularan virus. Penelitian ini bertujuan untuk merancang dan merealisasikan sistem presensi dengan fitur RFID yang contactless dan capture citra untuk menambah validasi data presensi agar tidak terjadi kecurangan. Hasil penelitian menunjukkan bahwa tag dapat teridentifikasi hingga jarak 4 cm dari permukaan casing. Pada jarak 5 cm tag tidak dapat teridentifikasi karena jarak pancar efektif gelombang radio dari sensor berkurang akibat dari ketebalan casing dan celah jarak antara sensor dengan casing. Proses presensi dapat dilakukan oleh sistem rata-rata 5,58 detik dengan waktu paling singkat 4,88 detik dan paling lama 8,44 detik. Sistem mampu melakukan ketepatan presensi sesuai event pada Google Calendar dan formulir dapat menampilkan data yang lengkap. Kesesuaian data tag dengan seseorang yang melakukan presensi dapat dicek dengan cara membandingkan foto pada formulir. Formula pada Spreadsheet dapat dimanfaatkan untuk rekapitulasi hasil data presensi. Kata kunci: Presensi, RFID, Spreadsheet, Capture Image, Jadwal ABSTRACTDuring the COVID-19 pandemic, physical presence is not recommended because it can increase the transmission of the virus. This study aims to design and realize presence system with contactless RFID features and image capture to increase attendance data validation so that fraud does not occur. The results showed that the tag can be identified up to a distance of 4 cm from the surface of the casing. At a distance of 5 cm the tag cannot be identified because the effective transmitting distance of radio waves from the sensor is reduced due to the thickness of the casing and the gap between the sensor and the casing. The attendance process that can be done by the system is an average of 5.58s with the shortest time of 4.88s and the longest being 8.44s. The system is able to perform precise attendance according to events on Google Calendar and the form can display complete data. The suitability of the tag data with someone who is present can be checked by comparing the photos on the form. The formula in the Spreadsheet can be used to recapitulate the results of attendance data.Keywords: Presence, RFID, Spreadsheet, Capture Image, Schedule

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Section: Pendahuluanunclassified

Sistem Presensi dengan Fitur RFID dan Capture Citra menggunakan NodeMCU dan ESP32-Cam

PRAKASA¹,

SYAFITRI²

2023

ELKOMIKA

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“…For the Eplane, the main-lobe direction is −0.6 • , so we used the angular range −5.4 • ≤ θ ≤ 4.2 • of the phase pattern shown in Fig. 4(c) to evaluate (5). Likewise, for the H-plane, the main-lobe direction is 1.4 • , hence, we used the angular range −3.4 • ≤ θ ≤ 6.2 • of the phase pattern shown in Fig.…”

Section: B Determination Of the Phc And Acmentioning

confidence: 99%

“…Likewise, for the H-plane, the main-lobe direction is 1.4 • , hence, we used the angular range −3.4 • ≤ θ ≤ 6.2 • of the phase pattern shown in Fig. 4(d) to evaluate (5). The minimum SSD is attained at (x dE , z dE ) = (0.3 mm, −6.1 mm) for the E-plane and (y dH , z dH ) = (0.1 mm, −11.7 mm) for the H-plane; these are the most suitable points for the PhCs.…”

Section: B Determination Of the Phc And Acmentioning

confidence: 99%

“…However, the gain measurements wherein the distance between antenna apertures is 2D 2 /λ (where D represents the maximum dimension of the radiator and λ represents the operating wavelength) lead to underestimates of the antenna gain on the order of 1 dB despite the fact that the far-field (FF) condition assumed in the Friis equation is satisfied [3], [4]. This underestimation occurs owing to the prevalent practice of considering the antenna aperture as a reference point for establishing the antenna separation distance in the measurements [5], [6]. In scenarios involving such physical reference points, the measurements must be performed at a minimum separation distance of 16×2D 2 /λ between the antenna apertures to restrict the gain reduction within 0.05 dB [4].…”

Section: Introductionmentioning

confidence: 99%

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Accurate Determination of Antenna Gain in the 300-GHz Band Using Amplitude Center Estimated From Electrooptic Near-Field Measurements

Hayashi,

Katsuue,

Tanaka

et al. 2023

IEEE Open J. Antennas Propag.

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Antenna gain determination using the Friis equation typically employs the geometrically determined physical distance between antenna apertures, which often underestimates the gain. Herein, we propose and demonstrate an accurate antenna-gain determination method using the distance between the amplitude centers (ACs) of the antennas determined from the spatial phase distribution of the near field measured based on an electrooptic technique. Employing a WR-3.4 horn antenna, we show that at 286 GHz, the proposed method determines antenna gain with the same level of error even when the antenna separation distance is 1/5 shorter than that obtained using the conventional method that employs the physical distance between the antenna apertures in the Friis equation. Furthermore, the gain calculated using the proposed method achieves an error margin of <0.08 dB compared with that determined using the extrapolation method, which also utilizes the geometric physical distance between the antenna apertures. Notably, as the AC can be directly measured from the near-field distribution, the proposed method enables accurate antenna gain measurements without requiring prior knowledge of the characteristics and structural details of the antenna.

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“…[11][12][13][14][15][16][17][18] Furthermore, different designs for quad-band metamaterial-based antennas are introduced over the last few years. [19][20][21] Metamaterials have been proposed for a range of emerging applications such as metasurface, [22][23][24][25] electromagnetic filtering, 26,27 5 G beam steering, [28][29][30] antennasensor, [31][32][33] and artificial intelligence approaches. 34,35 In Abdelaziem et al, 25 a compact printed twolayer metasurface is placed on top of a microstrip single-band patch antenna to achieve dual-band operation at 27 GHz for 5 G millimeter-wave applications, lowlevel cross-polarization, and high radiation efficiency.…”

Section: Introductionmentioning

confidence: 99%

Miniaturized tri‐wideband antenna loaded with metamaterial meander lines

Ghasri

Nourinia

Ghobadi

et al. 2022

Micro & Optical Tech Letters

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Here presents a new miniaturized tri‐wideband antenna loaded with metamaterial meander lines. The antenna consists of a rectangular radiation patch loaded with two compact metamaterial components. The three frequency bands are the results of resonances of a rectangular patch at 5.5 GHz, interdigital meander slit at 3.6 GHz, and virtual grounded thin meander stub at 7.5 GHz. More size miniaturization is accomplished by a compact virtual ground structure and cutting the upper and left edges of the substrate. Furthermore, matching at all bands is improved by taking advantage of stepped microstrip feed line and truncated rectangular ground plane. Measured results shows the frequency ranges of 3.32–4.06 GHz (20%), 5.17–6.06 GHz (16%), and 7.17–10.32 (36%). The antenna is analyzed with an equivalent circuit model. In comparison to previous works, this antenna has a simple design, very compact size of 10 mm × 15 mm × 0.8 mm, three wide working bands, and matching levels better than −20 dB at all resonant frequencies.

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High gain/bandwidth off-chip antenna loaded with metamaterial unit-cell impedance matching circuit for sub-terahertz near-field electronic systems

Cited by 5 publications

References 26 publications

Sistem Presensi dengan Fitur RFID dan Capture Citra menggunakan NodeMCU dan ESP32-Cam

Sistem Presensi dengan Fitur RFID dan Capture Citra menggunakan NodeMCU dan ESP32-Cam

Accurate Determination of Antenna Gain in the 300-GHz Band Using Amplitude Center Estimated From Electrooptic Near-Field Measurements

Miniaturized tri‐wideband antenna loaded with metamaterial meander lines

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