Laterally Placed CDRA with Triangular Notches for Ultra Wideband Applications

A compact dual band cylindrical dielectric resonator antenna (CDRA) is designed and presented. The CDRA is excited by E-shaped aperture, which is located below the microstrip line feed on the ground plane. The defected ground plane has a conducting strip under the Dielectric Resonator Antenna (DRA) that causes the upper resonance at 5 GHz. The lower band at 2.45 GHz is achieved by applying a metallic top-loaded cylindrical dielectric antenna (CDRA). The experimental results show the antenna covers 2.45 GHz and 5 GHz with −10dB return loss, satisfying the desired standards of WLAN applications.

In this paper, two identical Cylindrical Dielectric Resonator Antennas (CDRA) are stacked together to achieve Circular Polarization (CP). Ultra wideband impedance bandwidth and wide axial ratio bandwidth is achieved by three factors: stacking of similar DRs, stepped conformal microstrip feed line which will generate orthogonal modes and new partial ground plane with circular rings. Measurement results show that the proposed stacked Cylindrical CPDRA achieves an Impedance Bandwidth (IBW) of (S11 < −10 dB) of 72.48% (3.65–7.8 GHz) and Axial Ratio Bandwidth (ARBW) (AR <3 dB) of 44.12% (4.38–6.86 GHz), respectively. In addition, the proposed antenna shows dominant Left Hand CP with gain ranges from 1.4 to 6.5 dBic with maximum radiation efficiency of 93.3%. The advantages and novel points of proposed research work is as follows: (i) The novel configuration of stacking CDRA's along with stepped microstrip feed enhances ARBW, (ii) New proposed partial ground plane with two circular rings provides enhancement in IBW, (iii) Simple design and small height of DRs produces enhanced IBW, ARBW, Gain and Efficiency. Furthermore, by changing the position of circular rings on ground plane, the proposed antenna provides dominant LHCP to RHCP conversion and achieves polarization reconfigurability. The proposed antenna configuration covers the frequency range of applications of C-band and military satellite communication.

A low-profile cylindrical dielectric resonator antenna (CDRA) with enhanced impedance bandwidth is proposed via sharing a single triple-mode dielectric resonator. Initially, the resonant frequencies of TM 01δ and TM 02δ modes of a conventional CDRA are maintained far away from each other under central probe feed. Next, a circular disk with an annular ring is loaded around the conventional CDRA, aiming to excite an additional mode between these dual modes. The electric fields demonstrate that the previous TM 02δ mode is transformed into the TM 03δ mode for the modified CDRA, and an additional TM 02δ mode is successfully excited between the TM 01δ and TM 03δ modes. As a result, the resonant frequencies of these three radiative modes are reallocated in proximity to each other, thus achieving the desired bandwidth enhancement. In addition, considering the small input impedance of the CDRA, a microstrip feeding line is introduced underneath the central probe for good impedance matching. With these arrangements, the resultant antenna can generate an extended bandwidth under simultaneous radiation of TM 01δ , TM 02δ , and TM 03δ modes. Finally, the proposed CDRA is designed, fabricated, and measured to validate the predicted performance. The simulated and measured results show that the impedance bandwidth (|S 11 | < −10 dB of the antenna is dramatically extended from 8% to about 62% (2.83∼5.36 GHz), while keeping a stable conical radiation pattern. In particular, a low profile property of about 0.15 free space wavelength is achieved as well.

In this article, the design and analysis of a double cylindrical dielectric resonator antenna (CDRA) of compact size 40 × 40 mm2 with extended wideband characteristics for C- and X-band applications is presented. A couple of CDRA is placed over the two adjoin rectangular slots which are excited by a modified microstrip feed line of 50 Ω. The proposed double CDRA resonates between frequency band 4.75 and14.43 GHz with 100.93% (9.68 GHz) impedance bandwidth. Two adjoin rectangularslots with a modified microstrip feed line generate two orthogonal degenerated hybrid modes (HEMx 11δ and HEMy 11δ), which are liable for the creation of circular polarization characteristics between the frequency band 6.62 and 8.5 GHz with 24.86% (1.88 GHz) 3-dB axial ratio bandwidth. The stable peak gain of 6.27 dB at frequency 12.62 GHz, whereas the gain of 3.31–6.27 dB and radiation efficiency of more than 86% in the entire operating band is obtained.

The eigenmode expansion method is used to evaluate the resonant frequency of a probe fed cylindrical dielectric resonator (DR) antenna, which radiates above an infinite conducting ground plane. A parallel grounded conducting plane is added above the DR, thus allowing the use of cylindrical harmonic field expansions in the regions between the two parallel ground planes. The eigenmode expansion coefficients are found by enforcing the boundary conditions at conducting surfaces and regional interfaces. Then, from the induced currents on the probe surface, the input impedance and the resonant frequency of the DR antenna are evaluated. The results are compared with those of a previous configuration which has no upper ground plane. It is found that the deviation of the calculated resonant frequency is less than 2% for epsilon εr>9.

Design and analysis of stacked cylindrical dielectric resonator antenna (CDRA) with partial ground plane for ultra-wideband applications is examined. Ultra wide band has been achieved with the help of stacking of CDRA, mode conversion in CDRA and higher order mode generation in annular shaped printed line. The proposed design covers the frequency range of 3.55–10.78 GHz with a fractional bandwidth of 100.9% that satisfies the bandwidth requirement of UWB applications.

Communication of present era involves Wi-Fi, Wimax and WLAN. Proposed antenna is designed keeping in mind for these particular requirements. Narrow beam may impart large amount of gain for one particular communication requirements. This paper investigates cylindrical dielectric resonator antenna with introducing band gap structure on the circular patch of DRA for imparting high gain. The application of this antenna can had in the field of WLAN. In this paper characteristics of cylindrical Dielectric Resonator Antenna (DRA) using BaZrO3 (er=27) material, are studied. The DRA antenna is designed by using HFSS software which employs the FDTD method for solution. The characteristics of these antennas are investigated with both co-axial feeding and used for exciting the DRA. The experiment is performed on cylindrical DRA shape fed by coaxial and BaZrO3 material of dielectric constant 27.

This paper demonstrates the comparison between two on-chip antennas, circular microstrip patch antenna (CMPA), and cylindrical dielectric resonator antenna (CDRA), planned for operation at 60 GHz and integrated into 0.18-µm CMOS integrated circuits. The antennas are fed with similar feeding networks. The bandwidth for a return loss below −10 dB is 17.9 % for CMPA and 21 % for CDRA. The simulated radiation patterns of both antennas exhibit similar properties. The gain of the CDRA is 2.2 dB higher than CMPA. Likewise, the results show that the radiation efficiency of CDRA is significantly higher than that of the CMPA at 60 GHz. A comparative study on the transmission gain for wireless interconnections using CMPA and CDRA in the cases of intra- and inter-chip interconnections is investigated. Transmission gain proves the superiority of CDRA compared to CMPA. The proton implantation technique is used to improve the transmission gain. The silicon substrate resistivity is increased from 10 Ω-cm up to 10 MΩ-cm.

In this article, low-profile and compact cylindrical dielectric resonator antenna along with circular slots and filtering structure for wireless application is reported. Proposed antenna is excited by annular-shaped microstrip line. Two ring-shaped resonators placed on opposite sides of feed line are working as a band-pass filter. These resonators are unified with wideband cylindrical dielectric resonator antenna and make it suitable for triple band operations with better isolation level. Dual ring-shaped parasitic slots on a partial ground plane are used to make CDRA more compact. The proposed triple band antenna has been analyzed, studied and optimized using Ansoft HFSS simulation software. Prototype of proposed geometry has been fabricated and tested. There is a better accord between simulated and measured results. The proposed design engenders three frequency bands i.e. 2.35–2.55 GHz; 3.35–3.65 GHz; and 5.1–5.42 GHz with a resonant frequency of 2.45, 3.55, and 5.35 GHz, respectively. Proposed antenna design may find suitable applications for WLAN (2.4/5.2 GHz) and WiMAX (3.5 GHz) bands. The proposed design shows an average measured gain of 4.71 dB in the three desired bands.

In this paper, a compact two-element cylindrical dielectric resonator antenna (CDRA) array with corporate feeding is proposed for X-band applications. The dielectric resonator antenna (DRA) array is excited by a microstrip feeder using an efficient aperture-coupled method. The designed array antenna is analyzed using a CST microwave studio. The fabricated sample of the proposed CDRA antenna array showed bandwidth extending from 10.42GHz to 12.84GHz (20.8%). The achieved array gain has a maximum of 9.29dBi at frequency of 10.7GHz. This is about 2.06dBi enhancement of the gain in comparison with a single pellet CDRA. The size of the whole antenna structure is about 5050mm2.

In this paper, a compact omnidirectional circularly polarized (CP) cylindrical dielectric resonator antenna (DRA) is presented. The DRA is excited in its TM01δ mode by a probe located at the center, giving linearly polarized (LP) omnidirectional radiation patterns. Four interleaved strips serving as a wave polarizer are placed on the top of the DRA. By tuning the strips, the LP fields can be changed into CP fields. The idea was verified at ∼ 2.4 GHz for WLAN applications. The impedance bandwidth (|S11|<−10 dB) and the 3-dB axial-ratio (AR) bandwidth are 14.5% (2.36-2.73 GHz) and 8.6% (2.33-2.54 GHz), respectively. Their overlapping bandwidth is 7.3% (2.36- 2.54 GHz), which can entirely cover the designed frequency band.

The paper discusses the experimental analysis on a cylindrical dielectric resonator antenna (DRA) with a parasitic conducting strip, loaded coplanar with the 50Ω microstripline feed. The antenna offers an impedance bandwidth as high as 17.33% at a centre frequency of 2.77 GHz, as a result of the enhanced coupling produced by the coplanar strip. The return loss, impedance, polarization and radiation characteristics of the antenna are studied. The radiation patterns are broad and the low cross-polarisation levels confirm that the antenna is linearly polarised over the entire impedance bandwidth.

Single-structure dual and triple linearly polarised cylindrical dielectric resonator antennas (CDRAs) with respective excitation sets of two orthogonal modes and three degenerate modes at 120° to each other are investigated for operation as compact multiport antennas. The diversity performance of these multiport CDRAs is evaluated using theoretical expressions of envelope correlation coefficient, mean effective gain (MEG) and MEG ratio in conjunction with simulation and experimental S-parameter results. The multiport CDRAs portray low mutual coupling (<−6.5 dB), different feed radiation pattern and polarisation directions, low envelope correlation coefficients (<0.27) between feed points and near-equal branch MEG ratios (within±1.8 dB). Thus, they satisfy the diversity performance benchmarks for application as compact multi-polarised diversity or multiple-input multiple-output antennas.

This paper presents a novel dual-band cylindrical dielectric resonator antenna (DRA) integrated with concentric slot rings, designed for advanced wireless systems. The antenna operates over two distinct frequency ranges: 8–16 GHz (microwave) and 24–30 GHz (6G mmWave), offering wide impedance bandwidths of 8 GHz and 6 GHz, respectively, with reflection coefficients below −10 dB across both bands. The unique integration of the cylindrical DRA and concentric slot rings enables independent excitation of multiple resonant modes, ensuring stable E θ - and H ϕ -plane radiation characteristics and efficient mode separation. Simulation and measurement results show excellent agreement, with stable radiation patterns and peak gains of 5.5–6 dB in the microwave band and 7.5–8.5 dB in the mmWave band. The compact and easily integrable structure represents a significant improvement over conventional dual-band antennas, offering versatile multiband operation well-suited for high-capacity microwave links and emerging 6G mmWave communication applications.

A cylindrical dielectric resonator antenna with nested structure is designed. The antenna is nested by cylindrical dielectric resonators and ring dielectric resonators with different dielectric constants and fed by microstrip lines and cross slots. Simulation results show that when S11<-10dB, the antenna center frequency is about 25.56GHz, fractional bandwidth reaches 21.9% (23.75GHz-29.35GHz), gain reaches 6.43dBi, and circular polarization radiation exists in the passband. The bandwidth of the axial ratio less than 3dB is 7.57%(25.68GHz-27.71GHz).