scholarly journals Cylindrical Dielectric Resonator Antenna-Based Sensors for Liquid Chemical Detection

Sensors ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 1200 ◽  
Author(s):  
Amjad Iqbal ◽  
Amor Smida ◽  
Omar Saraereh ◽  
Qais Alsafasfeh ◽  
Nazih Mallat ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Dielectric Resonator ◽  
Microstrip Line ◽  
Chemical Detection ◽  
Dielectric Resonator Antenna ◽  
Rectangular Slot ◽  
Resonance Frequencies ◽  
Different Types ◽  
Radio Frequency Signals ◽  
Liquid Chemical

A compact, cylindrical dielectric resonator antenna (CDRA), using radio frequency signals to identify different liquids is proposed in this paper. The proposed CDRA sensor is excited by a rectangular slot through a 3-mm-wide microstrip line. The rectangular slot has been used to excite the CDRA for H E M 11 mode at 5.25 GHz. Circuit model values (capacitance, inductance, resistance and transformer ratios) of the proposed CDRA are derived to show the true behaviour of the system. The proposed CDRA acts as a sensor due to the fact that different liquids have different dielectric permittivities and, hence, will be having different resonance frequencies. Two different types of CDRA sensors are designed and experimentally validated with four different liquids (Isopropyl, ethanol, methanol and water).

Conical dielectric resonator antenna with improved gain and bandwidth for X-band applications

2017 ◽  
Vol 9 (8) ◽  
pp. 1749-1756 ◽  
Author(s):  
Sounik Kiran Kumar Dash ◽  
Taimoor Khan ◽  
Binod Kumar Kanaujia
Keyword(s):  
Dielectric Resonator ◽  
Microstrip Line ◽  
Ground Plane ◽  
Dielectric Resonator Antenna ◽  
Rectangular Slot ◽  
Wireless Applications ◽  
Feed Line ◽  
X Band

In this paper, a simple conical-shaped dielectric resonator antenna operating in HEM11δmode is presented for X-band wireless applications. A rectangular slot with a running microstrip line is used for excitation purpose. By placing a FR-4 based superstrate at 7 mm height from the ground FR-4 substrate and incorporating a set of modified ground plane on either side of the feed line, gain is improved by 42.85% and bandwidth by 68.92%, simultaneously. A prototype of designed antenna is fabricated and characterized. The measured results are found to be good in matching with the simulated ones.

scholarly journals Bandwidth Enhancement of Tri-band Rectangular Dielectric Resonator Antenna using Novel Offset Feed for WLAN/WIMAX Applications

2020 ◽  
Vol 9 (5) ◽  
pp. 2305-2308
Keyword(s):  
Dielectric Resonator ◽  
Microstrip Line ◽  
Return Loss ◽  
Radiation Efficiency ◽  
Antenna Design ◽  
Design Parameters ◽  
Dielectric Resonator Antenna ◽  
Bandwidth Enhancement ◽  
Frequency Bands ◽  
Rectangular Dielectric Resonator Antenna

In this article, a novel offset microstrip line feed Rectangular Dielectric Resonator Antenna is used for bandwidth enhancement. The parameters such as Bandwidth, Return Loss and Radiation efficiency are improved in the proposed antenna. A comparison is also shown for the proposed feed structure with and without conformal strips. The improvement in the bandwidth is observed from 25% to 65% by optimizing the antenna design parameters. It works in three frequency bands, that is, 2.03-3.69 GHz, 3.86-7.26 GHz, and 7.32-9.26 GHz. The proposed antenna is appropriate for WIMAX/WLAN applications.

Superior Modes in High Permittivity Cylindrical Dielectric Resonator Antenna Excited by a Central Rectangular Slot

2012 ◽  
Vol 60 (11) ◽  
pp. 5032-5038 ◽  
Author(s):  
Ovidiu Gabriel Avadanei ◽  
Marian Gabriel Banciu ◽  
Ioan Nicolaescu ◽  
Liviu Nedelcu
Keyword(s):  
Dielectric Resonator ◽  
Dielectric Resonator Antenna ◽  
High Permittivity ◽  
Rectangular Slot

scholarly journals A Comparison of RFID Anti-Collision Protocols for Tag Identification

2018 ◽  
Vol 8 (8) ◽  
pp. 1282 ◽  
Author(s):  
Nikola Cmiljanic ◽  
Hugo Landaluce ◽  
Asier Perallos
Keyword(s):  
Radio Frequency ◽  
Radio Frequency Identification ◽  
Communication Channel ◽  
Tag Identification ◽  
Collision Problem ◽  
Key Technologies ◽  
Different Types ◽  
Radio Frequency Signals ◽  
Frequency Identification ◽  
The Internet Of Things

Radio Frequency Identification (RFID) is a technology that uses radio frequency signals to identify objects. RFID is one of the key technologies used by the Internet of Things (IoT). This technology enables communication between the main devices used in RFID, the reader and the tags. The tags share a communication channel. Therefore, if several tags attempt to send information at the same time, the reader will be unable to distinguish these signals. This is called the tag collision problem. This results in an increased time necessary for system identification and energy consumption. To minimize tag collisions, RFID readers must use an anti-collision protocol. Different types of anti-collision protocols have been proposed in the literature in order to solve this problem. This paper provides an update including some of the most relevant anti-collision protocols.

scholarly journals Hybrid Dielectric Resonator Antenna Composed of High-Permittivity Dielectric Resonator for Wireless Communications in WLAN and WiMAX

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Yih-Chien Chen
Keyword(s):  
Wireless Communications ◽  
Dielectric Resonator ◽  
Simulation Software ◽  
Dielectric Resonator Antenna ◽  
High Permittivity ◽  
Resonant Frequencies ◽  
Rectangular Slot ◽  
Measurement Results ◽  
Simulation Results ◽  
Good Agreement

The-hybrid dielectric resonator antenna consisted of a cylindrical high-permittivity dielectric resonator, a rectangular slot, and two-rectangular patches were implemented. The hybrid dielectric resonator antenna had three resonant frequencies. The lower, middle, and higher resonant frequencies were associated with the rectangular slot, rectangular patches, and dielectric resonator, respectively. Parametric investigation was carried out using simulation software. The proposed hybrid dielectric resonator antenna had good agreement between the simulation results and the measurement results. The hybrid dielectric resonator antenna was implemented successfully for application in 2.4/5.2/5.8 GHz of WLAN and 2.5/3.5/5.5 GHz of WiMAX simultaneously.

A dual-band rectenna using broadband DRA loaded with slot

2017 ◽  
Vol 10 (1) ◽  
pp. 59-66 ◽  
Author(s):  
Sachin Agrawal ◽  
Manoj Singh Parihar ◽  
Pravin N. Kondekar
Keyword(s):  
Energy Harvesting ◽  
Dielectric Resonator ◽  
Electromagnetic Coupling ◽  
Dual Band ◽  
Impedance Bandwidth ◽  
Dielectric Resonator Antenna ◽  
Load Impedance ◽  
Rf Energy Harvesting ◽  
Rectangular Slot ◽  
Rf Energy

This paper presents a broadband hybrid slot-dielectric resonator antenna for radiofrequency (RF) energy-harvesting application. The antenna geometry consists of a simple pentagon-shaped dielectric resonator antenna (PDRA) excited by a microstrip feed underlying rectangular slot with narrow notch. It is investigated that the bandwidth of the proposed PDRA is improved significantly owing to electromagnetic coupling between feeding slot and the dielectric resonator. The measured results demonstrate that the proposed PDRA achieves an impedance bandwidth of 110.8%, covering the frequency range from 0.86 to 3 GHz in addition of stable radiation pattern with peak gain of 6.8 dBi and more than 90% radiation efficiency throughout the band, showing its suitability for RF energy harvesting application. For this to be feasible, the developed antenna is matched with the rectifier at two public telecommunication bands of GSM-900 and GSM-1800 using a compact dual-band hybrid matching network. The measured result demonstrates that the proposed dual-band rectenna system provides the peak efficiency of 63 and 59% for a load impedance of 4.7 kΩ at 0.9 and 1.8 GHz, respectively.

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