Highly Transparent and Tunable Antenna Window Using Saltwater for UHF Band Applications

2021 ◽  
Author(s):  
Duy Tung Phan ◽  
Tien Dat Nguyen ◽  
Chang Won Jung
Keyword(s):  
Single Port ◽  
Optical Window ◽  
High Transparency ◽  
Salty Water ◽  
Conductive Medium ◽  
Directional Radiation ◽  
Measurement Results ◽  
Tunable Frequency ◽  
Basic Configuration ◽  
Uhf Band

Abstract This paper presents a highly optical transparent and tunable liquid antenna for applications on the UHF band. The antenna has high transparency (> 91%), which is achieved through its use of salty water as a conductive medium held within a clear and hollow acrylic rectangular prism, allowing its use as an optical window. To achieve frequency- and beam-tunable characteristics, two advanced configurations of the antenna using dual-port feeding are proposed. The antenna’s performance is simulated and then verified through experiments. Measurement results show that for a basic configuration using single-port feeding, the antenna has a −6 dB bandwidth ranging from 350 to 675 MHz and efficient radiation efficiency (> 60%) over the band. For advanced configurations, a tunable frequency and directional radiation pattern can be achieved with enhancing gain compared to the basic configuration. These results demonstrate the proposed antenna can be used as a bi-functional device, i.e., as atunable antenna and optical window.

scholarly journals A 3D-Printed Hybrid Water Antenna with Tunable Frequency and Beamwidth

Electronics ◽  
2018 ◽  
Vol 7 (10) ◽  
pp. 230 ◽  
Author(s):  
Zeng-Pei Zhong ◽  
Jia-Jun Liang ◽  
Guan-Long Huang ◽  
Tao Yuan
Keyword(s):  
Beam Steering ◽  
Ground Plane ◽  
Fixed Direction ◽  
Gain Variation ◽  
Measurement Results ◽  
Feeding Structure ◽  
Operating Bandwidth ◽  
3D Printed ◽  
Metallic Strip ◽  
Tunable Frequency

A novel hybrid water antenna with tunable frequency and beamwidth is proposed. An L-shaped metallic strip is adopted as the feeding structure of the antenna in order to effectively broaden the operating bandwidth. The L-shaped strip feeder and a rectangular water dielectric resonator constitute the driven element. Five identical rectangular water dielectric elements are mounted linearly with respect to the driven element, which act as the directors and contribute to narrow the beamwidth. By varying the height of the liquid water level in the driven element, the proposed antenna is able to tune to different operational frequencies. Furthermore, it is also able to adjust to different beamwidths and gains via varying the number of director elements. A prototype is fabricated by using 3-D printing technology, where the main parts of the antenna are printed with photopolymer resin, and then the ground plane and L-shaped strip feeder are realized by using adhesive copper tapes. Measurement results agree well the simulation ones. A tunable frequency ranging from 4.66 GHz to 5.65 GHz is obtained and a beam steering along a fixed direction with a gain variation less than 0.5 dB is realized.

scholarly journals A Dual-Band Compact Metamaterial Absorber with Fractal Geometry

Electronics ◽  
2019 ◽  
Vol 8 (8) ◽  
pp. 879 ◽  
Author(s):  
Francesca Venneri ◽  
Sandra Costanzo ◽  
Antonio Borgia
Keyword(s):  
Fractal Geometry ◽  
Metamaterial Absorber ◽  
Dual Band ◽  
Substrate Thickness ◽  
Dual Frequency ◽  
Full Wave ◽  
Measurement Results ◽  
Uhf Band

A fractal absorber based on a metamaterial configuration is proposed for dual-frequency operation within the UHF band. The miniaturization skills of the proposed fractal shape are used to design a dual-band metamaterial absorber cell with reduced size (<λ/2 at the two operating frequencies) and a very thin substrate thickness (≅λ/100). A metamaterial absorber panel is realized and experimentally validated. Good agreements between full-wave simulations and measurement results are demonstrated.

scholarly journals The the design of the microstrip array antenna with the rosette patch for WLAN 2.4 GHz and 5.2 GHz frequencies

2020 ◽  
Vol 30 (2) ◽  
Author(s):  
Mohammad Hamdani
Keyword(s):  
Microstrip Antenna ◽  
Return Loss ◽  
Single Layer ◽  
Array Antenna ◽  
Wifi Networks ◽  
Directional Radiation ◽  
Ansoft Hfss ◽  
Measurement Results ◽  
Microstrip Array ◽  
Microstrip Array Antenna

This research discusses the design of the microstrip array antenna with the rosette patch model that works on WLAN 2.4 GHz and 5.2 GHz frequencies which are used for WIFI networks. This microstrip antenna is made using a feedline feed or direct feed with a directional radiation pattern. The initial design used Ansoft HFSS v.13. Software, then fabricated the Microstrip Antenna using a PCB with a single layer FR4 type, and consisted of a patch, substrate, and groundplane. This antenna has dimensions of 94 mm in length and 63.3 mm in width. The measurement results in Laboratorium obtained VSWR 1.6, return loss -12.817, and 31.357 impedance, at a frequency of 2.4 GHz. While at a frequency of 5.2 GHz the VSWR value is 1.292, return loss is -18,210, and impedance is 46.417.  

scholarly journals Rancang Bangun Antena Bowtie pada Video Sender sebagai Pemancar TV Streaming

2018 ◽  
Vol 10 (2) ◽  
pp. 59-63
Author(s):  
Nabila Shaffa Bestari ◽  
Agus Wagyana
Keyword(s):  
Field Strength ◽  
Return Loss ◽  
Register Transfer Level ◽  
Line Of Sight ◽  
Dipole Antennas ◽  
Analysis Process ◽  
Directional Radiation ◽  
Bowtie Antenna ◽  
Measurement Results ◽  
Non Line Of Sight

A streaming television usually broadcasted through internet and can be watched on computer or mobile phone. However it can also be seen through television using video sender as the transmitter. To transmit it, of course, a suitable antenna is needed, in this case a bowtie antenna is selected. This research describe the design of a bowtie antenna that will be used as a transmitter antenna on a video sender. This bowtie antenna is designed by using an aluminum plate works on frequency of 655 MHz and has a return loss value of -21.127 dB, VSWR 1.192, 5.11 dB gain and bi-directional radiation pattern. The analysis process is carried out by analyzing the data taken from the audio and video results received in television as well as data from the measurement of signal strength captured by Register Transfer Level Software Define Radio (RTL SDR) and dipole antennas. Measurement results will be displayed in the sdrSharp software. The results of this measurement will be associated with field strength which is related to television signals. This bowtie antenna can transmit audio and video up to 30 m and has an average field strength value in Line of Sight (LOS) conditions of 120.3208 dBμV / m and at Non Line of Sight (NLOS) conditions of 123.5014 dBμV / m which is in accordance with the field strength standard in Indonesia that regulated in Perkominfo No. 31 Tahun 2014 which is above 70 dBμV / m in band V.

scholarly journals Design of Optically Transparent Antenna with Directional Radiation Patterns

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Yuan Yao ◽  
Wanzhong Chen ◽  
Xiaodong Chen ◽  
Junsheng Yu
Keyword(s):  
Radiation Pattern ◽  
Impedance Matching ◽  
Frequency Selective Surface ◽  
Radiation Patterns ◽  
Surface Acting ◽  
Dedicated Short Range Communication ◽  
Directional Radiation ◽  
Measurement Results ◽  
Optically Transparent ◽  
Frequency Selective

An optically transparent antenna with directional radiation pattern is proposed in this paper. This antenna consists of a radiation patch above the transparent glass substrate and a frequency selective surface acting as the ground of microstrip antenna on the back of the glass. The frequency selective surface (FSS) performs well as ground in the working frequency range to achieve directional radiation pattern. A SMA connector is used to feed the antenna. The antenna can operate at the on-board dedicated short-range communication band from 5.725 GHz to 5.85 GHz. Simulations and measurements are carried out to study the antenna performances in terms of impedance matching, gain, and radiation patterns. Both of the simulation and measurement results are shown to illustrate the good performance of the proposed antenna. It is very suitable for car network communication scene.

scholarly journals A novel LTCC differentially Fed UWB antenna for the 60 GHz band

2011 ◽  
Vol 3 (2) ◽  
pp. 171-177
Author(s):  
Bill Yang ◽  
Alexander G. Yarovoy ◽  
A. Shenario Ezil Valavan ◽  
Koen Buisman ◽  
Oleksiy Shoykhetbrod
Keyword(s):  
Integrated Circuits ◽  
Wide Band ◽  
Impedance Bandwidth ◽  
60 Ghz ◽  
Radiation Patterns ◽  
Uwb Antenna ◽  
Monolithic Microwave Integrated Circuits ◽  
Directional Radiation ◽  
Measurement Results ◽  
High Dielectric

In this paper a novel differentially fed Ultra-Wide Band (UWB) antenna in low-temperature co-fired ceramics (LTCC) technology to be used in the 60 GHz band for integrated RF front-ends is presented. The antenna is based on the aperture stacked patch fed via H-shaped aperture to achieve more than 10 GHz operational bandwidth. The antenna is fed by a parallel-wire transmission line which enables the antenna to be directly integrated with differential Monolithic Microwave Integrated Circuits (MMICs). To alleviate influence of the surface waves (efficiently excited in LTCC material due to its high dielectric constant) on the antenna radiation and realize uni-directional radiation patterns, a dedicated shield is added to the antenna. The measured results of the shielded antenna showed that the antenna has an operational bandwidth from 51 GHz to over 65 GHz, the gain is about 3.5–8 dBi, and −5 dB beamwidth is about ±30°. The measurement results also demonstrated that the shield indeed improves the antenna impedance bandwidth, gain, and radiation patterns substantially.

scholarly journals The Issue of Data Exchange in the UHF Band RFID System with an Semi-Passive Transponder

2016 ◽  
Vol 62 (2) ◽  
pp. 141-146
Author(s):  
Marek Gotfryd ◽  
Wojciech Lichoń ◽  
Bartosz Pawłowicz
Keyword(s):  
Data Exchange ◽  
Additional Data ◽  
Additional Source ◽  
Rfid Systems ◽  
Data Measurement ◽  
Rfid System ◽  
Measurement Results ◽  
Passive Transponders ◽  
Physical Quantities ◽  
Uhf Band

Abstract The article discusses the specifics of data exchange in the UHF band RFID systems using semi-passive transponders. In addition to the antenna and the RFID chip, there is also an additional source of energy (eg. battery) in the structure of such transponder. The battery may be used to implement additional functions such as the ability to measure physical quantities (eg. temperature, humidity). In this regard, particular attention was paid to the discussion of phases of communication between transponder and RWD associated with additional data (measurement results). An analysis of transmitted data frames has been presented. The preliminary results of the measurements have shown that the number of memory block transmitted from transponder has an impact on the effectiveness of RFID system.

Transanale Single Port Mikrochirurgie – eine Optimierung der TEM-Technik

2010 ◽  
Vol 48 (08) ◽  
Author(s):  
C Lorenz ◽  
M Back ◽  
TE Langwieler
Keyword(s):  
Single Port
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