A novel dual-band planar monopole mobile phone antenna for TD-LTE and TD-SCDMA applications

Zhang, Mei; Luo, Guilan; Feng, Libo; Kui, Liping

doi:10.1109/icsai.2017.8248414

Cited by 3 publications

(5 citation statements)

References 15 publications

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“…The performance parameters of the LSAW, including the phase velocity (V p ), electromechanical coupling coefficient (K 2 ) and temperature coefficient of frequency (TCF r ), are calculated when the thickness of three kinds of electrode materials, Al, Cu and Au, changes from 0.01 λ to 0.15 λ. V p determines the operation frequency and size of the SAW devices, which can be calculated from Equation (1), where f r is the resonance frequency. K 2 determines the excited LSAW energy and bandwidth of the SAW devices, which can be calculated from Equation (2), where f a is the anti-resonance frequency.…”

Section: Simulation Of Lsaw Characteristicsmentioning

confidence: 99%

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Band 40/41 Surface Acoustic Wave Filters on 42°YX-Lithium Tantalate Substrate with Suppression of Transverse Leakage

Xiao,

Gao,

Chu

et al. 2024

Micromachines

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The transverse leakage of leaky surface acoustic waves (LSAWs) occurs on 42°YX-lithium tantalate substrates (42LT), which increases the insertion loss, narrows the bandwidth and flattens the roll-off of band 40/41 SAW filters and duplexers. In this work, LSAW characteristics with different metal materials and thicknesses are calculated by the finite element method (FEM), which determines the IDT material and thickness used for band 40/41 SAW filter design. To deeply understand transverse leakage and suppress it, the effects of different gap and dummy lengths on transverse leakage are simulated and discussed. Then, a new technique of using a wider dummy without any additional lithographic or depositing processes is proposed to suppress the leakage. Its effectiveness is validated by both simulations and experiments. Then, the technique is extended to applications of band 40 and 41 SAW filters. The experimental results show that with the wider dummy structure, the band 40 and 41 SAW filters achieve a more than 0.2 dB improvement in the insertion loss, a wider bandwidth and a steeper roll-off characteristic. This technique may also be extended to the other band SAW filter applications.

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Section: Simulation Of Lsaw Characteristicsmentioning

confidence: 99%

“…Bands 40/41 are important bands for the CHINA MOBILE 4G communication of TD-SCDMA's long-term evolution (TD-LTE) [1]. Presently, surface acoustic wave (SAW) filters and duplexers are the main solution for bands 40 (2320 MHz-2370 MHz) and 41 (2515 MHz-2675 MHz) due to their small size, low cost and steady performance [2].…”

Section: Introductionmentioning

confidence: 99%

Band 40/41 Surface Acoustic Wave Filters on 42°YX-Lithium Tantalate Substrate with Suppression of Transverse Leakage

Xiao,

Gao,

Chu

et al. 2024

Micromachines

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“…This antenna has various advantages such as simple to design, easy to modify according to needs, inexpensive and lightweight. Even so, it suits low bandwidth and low power application [8,9].…”

Section: Introductionmentioning

confidence: 99%

Detection of Active Mobile Phone in Exam Hall

et al. 2019

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The use of mobile phone as a cheating tool in the examination hall among students have considerably increased a burden to invigilators to ensure integrity in examination hall. Many active mobile phone detection schemes had been proposed as the solution to this problem. However, the detection system function in a small detection range of 1.5 to 2 meters from the detection circuit and does not distinguish various frequency bands of radio frequency signals. In order to have diverse range of RF mobile phone signals detection for alerting the invigilators of their specified monitoring region, antenna is proposed to be used. This is done by antenna design simulation using Computer Simulation Technology (CST) software. Two types of antenna; single-dipole antenna and multi-band dipole antenna are simulated to know the characteristics of VSWR, gain and total efficiency. From the simulation results, multi-band dipole antenna shows acceptable VSWR value which are approximate to 2 V, gain is equal to 2.85 dB and total efficiency is equal to 2.484 dB for 2.4 GHz signal. The results imply positive event that multi-band antenna can be a preferable tool in elaborating accurate RF signal detection of active mobile phone in examination hall.

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“…However, it suits low bandwidth and low power application [21]. Another type of antenna is dipole antenna, which usually comprises two straight lines of the same length, lying on the same axis and separated by a small gap [22]. Dipole antenna in [23] has been appeared to have maximum directivity.…”

Section: Introductionmentioning

confidence: 99%

“…Considering that the most recent mobile phones are equipped with various frequency ranges, multiband antenna which can cover the frequency range of GSM, DCS, PCS, UMTS, Bluetooth, WLAN and Wi-MAX network [22,24,25] can be the best candidate to be employed in the detection system of active mobile phone in assisting invigilators during the examination period. Multi-band antenna can be designed using a single printed dipole incorporating Compact Resonant Cell (CRC) structures as CRC structures provide a simultaneous matching for different frequencies [25].…”

Section: Introductionmentioning

confidence: 99%

Optimization of RF signal detection and alert system for restricted area

Nordin

Nazari

Razif

et al. 2019

IJEECS

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<p>This paper presents study on optimizing RF signal detection and alert system for restricted area. Nowadays, mobile phone utilization is very common among youngsters. Despite of being very useful for educational purpose, it turns into a noteworthy issue while being smuggled into restricted area, such as examination hall and used as a cheating tool. To overcome this problem, an advancement on the detection and alert system of active mobile phone was proposed by implementing RF signal detection system optimization using multi-band dipole antenna and alert system utilizing LED and camera. The system demonstrated higher sensitivity to 3G signal followed by GSM and Wi-Fi with the decrease in voltage value across the LED when distinguishing 3G, GSM and Wi-Fi signal with the estimation of 2.316 V, 1.162 V and 1.054 V respectively. The alert system was improved by activating LED and camera instead of buzzer in displaying the region of the active mobile phone. The camera was able to effectively capture the conceivable cheating area when active mobile phone is present. The images of the potential cheating region can be recovered from the computer. This framework can assist the invigilators with being cautioned to the potential regions of cheating using mobile phone.</p>

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A novel dual-band planar monopole mobile phone antenna for TD-LTE and TD-SCDMA applications

Cited by 3 publications

References 15 publications

Band 40/41 Surface Acoustic Wave Filters on 42°YX-Lithium Tantalate Substrate with Suppression of Transverse Leakage

Band 40/41 Surface Acoustic Wave Filters on 42°YX-Lithium Tantalate Substrate with Suppression of Transverse Leakage

Detection of Active Mobile Phone in Exam Hall

Optimization of RF signal detection and alert system for restricted area

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