Wideband Rectangular Dielectric Resonator Antenna Research Articles

Frequency reconfigurable wideband rectangular dielectric resonator antenna for sub-6 GHz applications with machine learning optimization

This work presents frequency reconfigurable Wideband Rectangular Dielectric Resonator Antenna (RDRA) using a Machine Learning (ML) approach for 5G (Sub-6 GHz) applications. The concept of ML is integrated with reconfigurable DRA for the first time. A novel approach has been proposed to obtain wideband and frequency reconfigurability. Frequency reconfigurability is achieved electronically (PIN diode switches) and operates in four different configurations, offering a maximum of 76.84 % wide tuning range. Hybrid structure and higher order mode TE111 and TE211 modes excitation is responsible for wideband operation. The Extreme Gradient Boosting (XGB) ML algorithm provides more than 90 % accuracy in all configurations for S11 prediction.

Wideband Singly Fed Compact Circularly Polarized Rectangular Dielectric Resonator Antenna for X-Band Wireless Applications

This work focuses on a compact circularly polarized wideband rectangular dielectric resonator antenna (RDRA) for X-band wireless applications. The wideband response of the RDRA is initially generated by a coaxial probe, a compact RDR, an air gap in the DR and a slot of rectangular shape in the ground. The circular polarization is achieved via incorporation of a unique feeding mechanism. The edge feeding of the RDRA with a coaxial probe generates the orthogonal modes in RDRA that make the design polarized circularly. The axial ratio performance is improved by adding a copper strip on the top of the DR. To validate the simulated results, the prototype design is fabricated and measured results are noted. For −10 dB reference value, the prototype has 59.74% impedance bandwidth (8.45–14.09 GHz). For 3 dB reference value of the axial ratio, the prototype has 9.24% Circular Polarization (CP) performance (10.084–11.084 GHz). The design has 6.5 dBic peak gain and 95.5% peak efficiency. Results show that simulated results are in close agreement with the measured results.

A Novel Wideband RDRA for WBAN Applications

A Wideband Rectangular Dielectric Resonator Antenna (RDRA) is presented in this manuscript. The proposed RDRA is designed for wideband body area network (WBAN) applications due to its compact size and wideband characteristics. The proposed antenna can be effectively integrated with modern medical devices for transmitting biological signals. WBAN attract variety of applications in monitoring human health in the domains such as sports, entertainment, defense, and healthcare industry. This manuscript presents a novel RDRA to meet recent research challenges as well as applications for future generation wideband RF-device technology for BANs. The miniaturized RDRA Antenna is designed for biotelemetry using HFSS 13, FEM based 3D EM Simulation Software

A wideband dielectric resonator antenna with a cross slot aperture for 5G communications

This paper represents design of a wideband Rectangular Dielectric Resonator antenna fed by an aperture coupled technique. A bandwidth of 2.2 GHz has been achieved using a cross slot aperture in a ground plane for Dielectric Resonator Antenna (DRA). The simulated gain value achieved is 6.5dBi. The Rectangular Dielectric Resonator which has been designed in this paper can be used in 5G application frequency band of 24.25-27.5 GHz. The calculated percentage bandwidth is 15.38 %. An optimization of slot dimensions has also mentioned which can help to select a desired impedance match. The measured gain and bandwidth are efficient to use this design for various 5G applications. This unit cell wideband DRA can be used for millimeter wave frequencies of 5G.

Microstrip Line Fed Wideband Circularly-Polarized Dielectric Resonator Antenna Array for Microwave Image Sensing

A high-gain circularly-polarized (CP) wideband rectangular dielectric resonator antenna (DRA) array, fed by microstrip lines, has been proposed for microwave image sensing. Initially, two orthogonal microstrip lines have been used to feed a single element DRA for obtaining circular polarization. A four element linear array has been conceived with such CP-DRA for obtaining higher directive gain, as well as circular polarization. Both single element DRA and four elements DRA array have been fabricated with Arlon AD270 substrate and Emerson & Cuming make Eccostock HIK materials. A 17 (6.2-7.35 GHz) measured impedance bandwidth and 10 (6.26.85 GHz) measured axial-ratio have been noticed for the proposed DRA array. The peak gain of the proposed DRA array varies between 12.113.6dBi over the entire axial-ratio bandwidth with a maximum gain of 13.6dBi. The simulated and measured results show good agreement.

ENHANCED RADIATION PATTERNS OF A WIDE-BAND STRIP-FED DIELECTRIC RESONATOR ANTENNA

A simple wide-band rectangular dielectric resonator antenna (DRA) is designed for the X-band and Ku-band applications. The DRA is excited by a vertical strip placed on the middle of the DRA wide side wall through a coaxial probe attached to a finite size ground plane. Good agreement between measured and simulated results is obtained. The measured 10 dB return loss bandwidth of the antenna is about 7.8 GHz (63%). The simulated gain of the antenna is 6.1 dBi at 12 GHz. The antenna excites undesired modes that perturb the radiation patterns and increase the cross-polarization level. The dielectric resonator is wrapped by a conducting strip to suppress some modes and improve the radiation characteristics of the antenna. Adding the strip reduces the cross polarization level and improves the co-polarization radiation pattern.

A Compact Wideband Rectangular Dielectric Resonator Antenna using Perforations and Edge Grounding

A compact wideband rectangular dielectric resonator antenna (RDRA) is investigated and presented. Perforations improve bandwidth by lowering down the quality factor. The perforations are an array of symmetrical square-shaped slots drilled uniformly on the RDRA. On choosing the optimal size of slots and distance between two consecutive slots, the fundamental TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">111</sub> mode of the RDRA is preserved. This aids in making the geometry compact by employing edge grounding. The coaxial probe acts like a monopole that further improves bandwidth by matching, monopole, and higher-order TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">131</sub> -like mode of the RDRA in the frequency band (2.72-4.3 GHz). The proposed geometry offers a wide impedance bandwidth of 56% for . The measured results show that the radiation efficiency of the proposed antenna is above 85% for the complete bandwidth with the stable radiation pattern.

Bandwidth Enhancement and Radiation Characteristics Improvement of Rectangular Dielectric Resonator Antenna

Abstract-A simple, compact, wideband rectangular dielectric resonator antenna (RDRA) is presented. The bandwidth is enhanced using a proper tapered strip excitation from one side of the DR. The radiation characteristics are improved by adding a shorted narrow strip to the opposite side of the excitation. In addition, by using this shorted strip, further improvement of the bandwidth is obtained. A parametric study on the strip dimension is carried out. The proposed DRA with good radiation characteristics offers a measured bandwidth of 96% between 2.13 and 6.08 GHz for VSWR <; 2.

WIDEBAND RECTANGULAR DIELECTRIC RESONATOR ANTENNA (DRA) WITH SLOT-FED DESIGN

A novel wideband rectangular dielectric resonator antenna (DRA) is proposed in this paper. A hybrid structure with an isolated dielectric resonator (DR) and an equivalent air-dielectric DR is introduced by lifting the resonator from the ground plane. The hybrid structure is excited by a slot-fed mechanism to obtain a smooth transition between each resonant mode. The resonant modes of the isolated DR and the equivalent DR are merged together to form a wideband impedance bandwidth. It is found that the bandwidth of the proposed antenna can be greatly enhanced by using the hybrid DRA structure instead of the case mounted on the ground plane. A detailed parametric study is carried out to analyze the characteristics of the proposed antenna. Measured results show that the proposed DRA has a 10dB impedance bandwidth of 61% from 2.4GHz to 4.5GHz and the radiation pattern is stable through the operating frequency.