Showing papers on "Dielectric resonator antenna published in 2016"

Closely packed millimeter-wave MIMO antenna arrays with dielectric resonator elements

Abstract: The design of a millimeter-wave (mm-wave) dielectric resonator (DR) multiple-input-multiple-output (MIMO) antenna system is presented. The MIMO structure consists of four arrays each radiating in one of four opposite directions. Each array is composed of four cylindrical DR antenna elements (cDRAs) operating at 30 GHz with a fractional bandwidth of at least 6.7%. The elements are fed via slot coupling which isolates the radiating elements from the feeding network. Also, each array in the MIMO system has a fixed and tilted beam enabling good MIMO operation which results from a passive microstrip-based feed network. The four arrays are closely packed in two pairs with each pair occupying only 20 × 10 × 3.1 mm3 on the top layer of the PCB. The proposed antenna can be used for compact mobiles that support 5G data links.

A Low-Profile Stacked Dielectric Resonator Antenna With High-Gain and Wide Bandwidth

Abstract: A wideband, low profile and high gain dielectric resonator antenna is investigated in this letter. The antenna consists of two dielectric layers with different permittivities and it is centrally fed by a rectangular slot. By placing the dielectric layer of low permittivity (2.2) below that of high permittivity (15), the antenna with low profile of $0.1{\lambda _0}$ can obtain a 10-dB impedance bandwidth of $\sim 40\% $ and an average gain of $\sim 9~\hbox{dBi}$ .

A Compact Filtering Dielectric Resonator Antenna With Wide Bandwidth and High Gain

Abstract: A rectangular filtering dielectric resonator antenna (FDRA) with low profile, wide bandwidth, and high gain is first investigated in this communication. It is fed by a microstrip-coupled slot from bottom, with open stub of the microstrip feedline elaborately designed to provide two radiation nulls at band edges for a filtering function. A separation is introduced in the slot to provide a good suppression level in lower stopband, while two parasitic strips are parallelly added to the microstrip feedline to offer good suppression in the upper stopband, and consequently, a compact FDRA with a quasi-elliptic bandpass response is obtained without involving specific filtering circuits. Based on the design, a modified DRA fed by a pair of separated slots is proposed to further enhance the gain by $\sim 4$ dB. A prototype operating at 5 GHz has been fabricated and measured for demonstration. The reflection coefficient, the radiation pattern, and the antenna gain are studied, and reasonable agreement between the measured and simulated results is observed. The prototype has a 10-dB impedance bandwidth of 20.3%, an average gain of 9.05 dBi within passband, and an out-of-band suppression level of more than 25 dB within a wide stopband.

Spoof Plasmon-Based Slow-Wave Excitation of Dielectric Resonator Antennas

Abstract: A spoof plasmon (SP)-based slow-wave feeding configuration is proposed, experimentally verified and exploited to excite the fundamental horizontally polarized mode of dielectric resonator antennas (DRAs). As an example, a cylindrical DRA operating at 3 GHz is fed by the proposed feeding structure. The simulation and measurement evidence the unique features of ${\rm TE}_{01\updelta}$ mode such as lower thickness-dependency of the resonant frequencies, superb miniaturization and ultra-compactness, and omnidirectional radiation for horizontally polarized waves. We anticipate that the ground-free SP-based feeding technique could be applied to effectively excite the more “unusual” modes of the isolated DRAs.

Gain Enhancement of Circularly Polarized Dielectric Resonator Antenna Based on FSS Superstrate for MMW Applications

Abstract: In this communication, a high gain circularly polarized (CP) dielectric resonator antenna (DRA) is proposed. The radiating DR is coupled to a $50~\Omega $ microstrip line through an X-shaped slot etched off the common ground plane. Using a frequency selective surface superstrate layer, a gain enhancement of 8.5 dB is achieved. A detailed theoretical analysis is given and used to optimize the superstrate size and the air gap height between the antenna and superstrate layer. The proposed DRA is designed, simulated, implemented, and tested. The high gain CP DRA has the potential to be used for millimeter wave wireless communication and imaging systems.

Mutual coupling reduction between closely placed microstrip patch antenna using meander line resonator

Abstract: An approach of reducing Mutual Coupling between two patch antennas is proposed in this paper. Here, a meander line resonator is placed in between the radiating elements. By inserting the meander line resonator between the patch antennas with the edge-to-edge distance less than λ/18, about 8 dB reduction of Mutual Coupling throughout the 10-dB bandwidth has been achieved without degrading the radiation pattern. The circuit model of the proposed configuration is carried out in this paper. The envelope correlation coefficient investigation has been done and the results are presented. The proposed structure has been fabricated and measured.

A Wideband Circularly Polarized Cubic Dielectric Resonator Antenna Excited With Modified Microstrip Feed

Abstract: A wideband circularly polarized cubic-shaped dielectric resonator antenna (DRA) was excited with a new question-mark-shaped microstrip feed, which provides two orthogonal modes with a quadrature phase difference, hence generating circular polarization. The proposed antenna offers measured - 10-dB impedance bandwidth of 35.35% (at center frequency 3.14 GHz) and measured 3-dB axial-ratio bandwidth of 20.62% (centered on 3.29 GHz) in the broadside direction. The proposed DRA shows the maximum gain and radiation efficiency of 1.51 dB and 90.65%, respectively, in the operating band. It was observed that the proposed antenna is left-hand circular polarized. This antenna is useful for WiMAX (3.3-3.7 GHz) applications.

Microstrip Patch versus Dielectric Resonator Antenna Bearing All Commonly Used Feeds: An experimental study to choose the right element.

Abstract: Microstrip patches and dielectric resonators (DRs) are two low-profile variants of modern microwave and wireless antennas. However, the DR antenna (DRA) is relatively new and still passing through the stages of development. Both variants are quite similar in terms of performance and characteristics. This article focuses on a meaningful comparative study where we have considered all commonly used feed mechanisms such as coaxial probe, microstrip line, and rectangular aperture for both antennas operating near the same frequency. Circular geometry, i.e., cylindrical DRA (CDRA) and circular microstrip patch antenna (CMPA), have been chosen, and a systematic investigation based on thorough experiments has been executed. Multiple sets of prototypes have been fabricated and measured at 4 GHz. All available data have been furnished and compared, indicating relative advantages and disadvantages. This comparative study should provide qualitative and quantitative instructions to a designer for choosing the right element and corresponding feed based on design requirement and feasibility.

Compact Highly Integrated Planar Duplex Antenna for Wireless Communications

Abstract: This paper proposes a novel concept of an integrated duplex antenna for realizing a compact multifunction RF front end by integrating a duplexer and a dual-band patch antenna. First, an all-resonator-based duplexer is designed. It is composed of two sets of split-ring resonators as channel filters, which are joined by a dual-mode stub-loaded resonator as the junction resonator. Then, a novel dual-band patch antenna is achieved by coupling a patch with a hairpin resonator through a slot in the ground. Uniform radiation characteristics have been achieved across the two bands. Finally, the duplexer is integrated with the dual-band patch antenna to form a highly integrated duplex antenna by coupling the hairpin resonator to the junction resonator of the duplexer directly. In this process, the 50- $\Omega $ interface and matching network between them are removed, contributing to a compact footprint. The details of codesign approach have been discussed in this paper. Compared with the traditional cascaded duplexer and antennas, this paper is much more compact and integrated but with an improved frequency response. A prototype of an integrated duplex antenna at S-band is fabricated and measured, showing two operation channels of 2.52–2.65 GHz for transmitting and 2.82–2.94 GHz for receiving with an isolation of over 32 dB. The measured results agree well with the simulation results.

System for wireless energy distribution in a vehicle

Abstract: Described herein are improved capabilities for a system and method for wireless energy distribution to a mechanically removable vehicle seat, comprising a source resonator coupled to an energy source of a vehicle, the source resonator positioned proximate to the mechanically removable vehicle seat, the source resonator generating an oscillating magnetic field with a resonant frequency and comprising a high-conductivity material adapted and located between the source resonator and a vehicle surface to direct the oscillating magnetic field away from the vehicle surface, and a receiving resonator integrated into the mechanically removable vehicle seat, the receiving resonator having a resonant frequency similar to that of the source resonator, and receiving wireless energy from the source resonator, and providing power to electrical components integrated with the mechanically removable vehicle seat.

A Novel Single-Fed Wide Dual-Band Circularly Polarized Dielectric Resonator Antenna

Abstract: A new single-fed wide dual-band circularly polarized (CP) dielectric resonator antenna (DRA) is presented in this letter. The DRA is excited by a microstrip line through the narrow underneath rectangular aperture, and its HE 111 and HE 11δ (2 <; δ <; 3 ) modes are utilized for the dual-band design. To achieve CP fields, two notches are truncated from the cylindrical DRA at φ = 45 ° and 225 ° . A pair of equal arc-shaped slots are used to improve the axial-ratio (AR) and impedance bandwidths. The antenna features impedance bandwidths (|S 11 | <; -10 dB ) of 26.25% and 11.17%, and 3-dB AR bandwidths of 15.8% and 5.02% in the lower and upper bands, respectively. To verify the simulation, the antenna is designed and measured. Reasonable agreement between measured and simulated results is obtained.

Design of an MIMO Dielectric Resonator Antenna for 4G Applications

Abstract: A two-port MIMO Dielectric Resonator Antenna (DRA) has been proposed and studied. The antenna consists of a single Rectangular DRA (RDRA) element housed in a thin FR4 substrate, that is fed by two microstrip feed lines. Both the feeding lines excite $${\text{TE}}_{\updelta 11}^{\text{X}}$$TE?11X mode in the RDRA. The mutual coupling between the ports has been decreased by employing two symmetrical slits in the ground plane. The proposed antenna has been fabricated and a parametric study has been carried out to obtain the optimum parameters. The presented antenna with acceptable MIMO characteristics, covers a measured bandwidth of 80 MHz (2.56---2.64 GHz) for |S11| < ?10 dB, which is able to operate on LTE band 38. The measured isolation between the two ports for the desired frequency band is better than 20 dB. The presented antenna has been examined by calculating and measuring the Envelope Correlation Coefficient, Mean Effective Gains and the Diversity Gain. Based on the study that has been carried out, the antenna offers easy fabrication, feeding and good MIMO characteristics. Therefore, the presented antenna can be a suitable candidate for LTE applications.

Near-field characterization of a Bloch-surface-wave-based 2D disk resonator

Abstract: We present, to the best of our knowledge, the first experimental investigation of a two-dimensional disk resonator on a dielectric multilayer platform sustaining Bloch surface waves. The disk resonator has been patterned into a few tens of nanometer thin (∼λ/25) titanium dioxide layer deposited on the top of the platform. We characterize the disk resonator by multi-heterodyne scanning near-field optical microscopy. The low loss characteristics of Bloch surface waves allowed us to reach a measured quality factor of 2×103 for a disk radius of 100 μm.

Multiple Band Notched Filter Using C-Shaped and E-Shaped Resonator for UWB Applications

Abstract: In this letter, a highly selective ultra wide band (UWB) band pass filter (BPF) with triple notch bands is proposed using C-Shaped and E-Shaped resonators along with a triangular ring loaded stub resonator (TRLSR) resting on a multi-mode resonator (MMR). The MMR is constructed using a uniform transmission line and parallel coupled lines connected to 50 $\Omega$ feed lines at both ends. Five even and odd modes are created to achieve an UWB passband response. Additionally, two transmission zeros at lower and upper cutoff frequencies of the passband are formed by TRLSR which helps to get a high skirt factor (SF) of 0.975. In addition, multiple notch bands are created using $\lambda_\mathrm{g}/2$ resonators to reject three interfering frequency bands named as WiMAX, WLAN, and X-Band. The center frequency of each notch can be controlled by tuning the length of the resonator. The proposed filter is simulated, fabricated, and tested experimentally. Both the predicted and the measured results are in good agreement and replicating the behavior of the proposed filter.

A Novel Pattern-Reconfigurable Cylindrical Dielectric Resonator Antenna With Enhanced Gain

Abstract: A cylindrical dielectric resonator antenna with switchable beams is proposed in this letter. The high-order HEM 21(1 + δ) mode of cylindrical dielectric resonator is excited at 5.8 GHz for high gain and quasi-endfire radiation pattern for the first time. Eight switches, whose locations are carefully optimized, are used to control the beam directions. By turning on one of the eight PIN diodes, the proposed antenna can rotate the beam to the opposite direction of the switch. For each direction, the antenna exhibits high gain (7.27 dBi), high efficiency (86.1%), low cross-polarization level, and similar radiation patterns. With these advantages, the antenna can be widely applied in wireless communication systems, especially for multiple-input-multiple-output (MIMO) systems.

Alternative surface integral equation-based characteristic mode analysis of dielectric resonator antennas

Abstract: Dielectric resonator antennas are widely used in wireless communication systems. A theory of characteristic modes (CMs) for modal analysis of dielectric resonators is highly demanded. Although a few earlier studies had proposed CM theory for modelling scattering from dielectric bodies, the physical characteristics of these CMs and their eigenvalues are not as clear as that of those for conducting bodies. This study revisits the CM theory for dielectric resonators. Following the Poynting's theorem and the PMCHWT (Poggio, Miller, Chang, Harrington, Wu, and Tsai) equation, two generalised eigenvalue equations are formulated. The resultant eigenvalues possess clear physical meanings that are the same as those of perfectly electrically conducting problems. In addition, other possible CM formulations based on the PMCHWT equation are also discussed. Mathematical proofs are given in the Appendix to show how to formulate CM theory to physically describe the fundamental resonant modes of dielectric resonators. Numerical results are given to show the proposed CM formulations are effective in solving resonant frequencies and modal fields for dielectric resonators.

Wideband Circularly Polarized Antenna With Stair-Shaped Dielectric Resonator and Open-Ended Slot Ground

Abstract: A novel wideband circularly polarized (CP) antenna with a stair-shaped dielectric resonator and an open-ended slot ground is introduced. By adjusting parameter values of the hybrid structure, wideband CP characteristics can be realized. In order to improve the impedance matching and enhance the axial-ratio (AR) bandwidth, the open-ended slot is also inserted in the ground plane. The antenna is fully studied and manufactured. Measured results show that the proposed antenna has 10-dB return loss of 71.7% (3.844–8.146 GHz) and 3-dB AR bandwidths of 46.0% (4.15–6.63 GHz), respectively, and a peak gain of 3.9 dBic. In addition, more than 92% antenna radiation efficiency is obtained.

Rectangular dielectric resonator antenna array for 28 GHz applications

Abstract: In this paper, a Rectangular Dielectric Resonator Antenna (RDRA) with a modified feeding line is designed and investigated at 28 GHz. The modified feed line is designed to excite the DR with relative permittivity of 10 which contributes to a wide bandwidth operation. The proposed single RDRA has been fabricated and mounted on a RT/Duroid 5880 (er = 2.2 and tanδ = 0.0009) substrate. The optimized single element has been applied to array structure to improve the gain and achieve the required gain performance. The radiation pattern, impedance bandwidth and gain are simulated and measured accordingly. The number of elements and element spacing are studied for an optimum performance. The proposed antenna obtains a reflection coefficient response from 27.0 GHz to 29.1 GHz which cover the desired frequency band. This makes the proposed antenna achieve 2.1 GHz impedance bandwidth and gain of 12.1 dB. Thus, it has potential for millimeter wave and 5G applications

Miniaturized Quasi-Lumped Resonator for Dielectric Characterization of Liquid Mixtures

Abstract: A novel miniature sensor operating at 150 MHz for real-time sensing of fluid concentrations is presented. The core of the sensor is a planar double-sided spiral split-ring resonator (DSS-SRR). At resonance, a strong electric field will be established mainly in the interdigital region of the DSS-SRR, producing a very sensitive area to a change in liquid concentration. A prototype is fabricated on RT/Duroid 5880 substrate and calibrated using deionized water/ethanol mixture. A mathematical model is derived to establish a relationship between resonance frequency and permittivity for sensor calibration. Good agreement has been reached between the actual and estimate values of permittivity. The proposed sensor offers other advantages, as high sensitivity, small sample volume, short assay time, low cost, and lab-on-a-chip compatibility. The major potentials are set in evidence from comparison with the state-of-the-art sensors.

Compact Linearly and Circularly Polarized Unidirectional Dielectric Resonator Antennas

Abstract: The linearly polarized (LP) and circularly polarized (CP) unidirectional dielectric resonator (DR) antennas (DRAs) with compact ground planes are investigated. Both designs make use of the broadside DR ${\text{HEM}}_{11{{\delta}}}$ mode to obtain the required equivalent magnetic dipoles. The required electric dipoles are provided by the currents on the small ground planes. To demonstrate the idea, both LP and CP unidirectional DRAs operating at 2.4 GHz were designed, fabricated, and tested. Reasonable agreement between the measured and simulated results is observed. It was found that the front-to-back ratio (FTBR) of the LP design is more than 15 dB over the frequency range 2.30–2.55 GHz (10.1% bandwidth). For the CP design, the FTBR is over 15 dB across the frequency range 2.40–2.55 GHz (6.1% bandwidth).

Enhanced-Gain Dielectric Resonator Antenna Based on the Combination of Higher-Order Modes

Abstract: The combination of two higher-order hybrid electromagnetic modes ( ${{\rm HEM}_{133}}$ and ${{\rm HEM}_{123}}$ ) in a simple cylindrical dielectric resonator is exploited in the presented letter to enhance antenna gain. Both modes were excited by the same feeding aperture in the ground plane of a microstrip line. A linearly polarized, broadside radiation pattern with maximum realized gain of about 11.6 dBi was successfully obtained. The antenna was designed for the ISM band with central frequency 5.8 GHz and relative bandwidth of at least 2.6%. For fabrication, we used a layered Arlon AR600 substrate of relative permittivity 6.15. Experimental results showed reasonable agreement with simulations and validated the new concept of the high-gain dielectric resonator antenna.

A Compact Wideband Dielectric Resonator Antenna With a Meandered Slot Ring and Cavity Backing

Abstract: We design a compact cavity-backed antenna structure where a dielectric resonator (DR) element is surrounded by a meandered circular slot ring to enhance radiation efficiency. The DR for the antenna is cylindrical in shape, and four degenerate HE 11δ modes are excited and driven by four, quadrature-fed aperture-coupled slots. Such a compact implementation hybridizes operation of the DR with the miniaturized ring as well as the four aperture-coupled slots for circular polarization. Measured realized gain values are greater than 5 dBic from 1.14 to 1.55 GHz defining a bandwidth of more than 30%. In addition, the half-power and 3-dB axial-ratio beamwidths were measured to be more than 100 ° and 200 °, respectively. The proposed design technique to employ such a secondary meandered slot ring may also be useful to improve antenna gain, bandwidth, and efficiency for other antenna and array structures.

A Novel Low-Profile Dual Circularly Polarized Dielectric Resonator Antenna

Abstract: A novel dual-port dual-sense circularly polarized (CP) T-shaped dielectric resonator antenna is introduced. The antenna consists of a T-shaped dielectric resonator, a pair of microstrip-fed stubs printed on a substrate with a truncated ground plane, and a decoupling network. Circular polarization is obtained by the structure to excite multiple orthogonal modes. The antenna can radiate left-hand CP (LHCP) or right-hand CP (RHCP) fields depending on the feed port selected. The measured RHCP (LHCP) field at the boresight direction is more than 26 dB (25 dB) stronger than the LHCP (RHCP) counterpart at the center operating frequency. The measured results show that the antenna has usable bandwidths of 17.2% (4.98–5.92 GHz) and 17.9% (5.02–6.03 GHz) and peak gains of 3.2 and 3.3 dBic at two feed ports, respectively. The isolations between two feed ports are better than 22.5 dB over the whole operating band. In addition, the antenna has peak radiation efficiencies of about 89% and 91% for Ports 1 and 2, respectively.

A High-Gain Wideband Low-Profile Fabry–Perot Resonator Antenna With a Conical Short Horn

Abstract: A compact wideband high-gain antenna is proposed and developed by using various performance enhancement structures. First, a Fabry–Perot resonator antenna (FPRA) is investigated with a single truncated superstrate that achieves increased reflection phase, low profile, compact size, and wide bandwidth. A conical horn is then incorporated with the FPRA to enhance its gain without compromising other performances such as input impedance matching and gain bandwidth. Both simulations and experiments were carried out to validate the designs, and good agreements are obtained. A final antenna with a peak gain of 19.1 dBi and a 3-dB gain bandwidth of more than 26% is developed.

Fiber ring resonator with nanofiber section for chiral cavity quantum electrodynamics and multimode strong coupling

Abstract: We experimentally realize an optical fiber ring resonator that includes a tapered section with subwavelength-diameter waist. In this section, the guided light exhibits a significant evanescent field which allows for efficient interfacing with optical emitters. A commercial tunable fiber beam splitter provides simple and robust coupling to the resonator. Key parameters of the resonator such as its out-coupling rate, free spectral range, and birefringence can be adjusted. Thanks to the low taper- and coupling-losses, the resonator exhibits an unloaded finesse of F=75+/-1, sufficient for reaching the regime of strong coupling for emitters placed in the evanescent field. The system is ideally suited for trapping ensembles of laser-cooled atoms along the nanofiber section. Based on measured parameters, we estimate that the system can serve as a platform for optical multimode strong coupling experiments. Finally, we discuss the possibilities of using the resonator for applications based on chiral quantum optics.

Experimental Investigations on Wideband Triangular Dielectric Resonator Antenna

Abstract: An isosceles 30°–75°–75° triangular dielectric resonator antenna (TDRA) is excited using coaxial probe. The antenna gives a measured 47.4% impedance bandwidth, which is much wider than the earlier reported work (5.5%) covering 4.33–7.02 GHz. The wideband is due to the multimode excitation of the ${\mathbf {TM}}_{\mathbf {101}}^{\mathbf {z}}$ and ${\mathbf {TM}}_{\mathbf {103}}^{\mathbf {z}}$ modes. Radiation patterns at different $\vphantom {^{\int }}$ frequencies (5.2, 5.3, 5.8, and 6.5 GHz) are given to show its broadside radiating property. It is found that the TDRA gives good differences between copol and cross-pol (approximately 20 dB) in the broadside direction. This antenna is suitable for IEEE 802.11a/h/j/n, U-NII band applications.

3d ceramic mold antenna

Abstract: An antenna include a resonator element configured to radiate a wireless signal and a substrate embedding the resonator. The resonator element may be a 3D resonator element. The 3D resonator element may be a helical resonator element.

Dielectric Resonator Working as Feed as Well as Antenna: New Concept for Dual-Mode Dual-Band Improved Design

Abstract: A new and physically realizable feed employing a dielectric resonator (DR) has been conceived and demonstrated for ${\rm HEM}_{12\delta}$ mode in a cylindrical dielectric resonator antenna (CDRA). This indeed enables in realizing an improved version of dual-band dual-mode dielectric resonator antenna (DRA) with attractive broadside radiation along with wide bandwidth characteristics. It comprises of a two-element stacked geometry, where the lower element is excited by an aperture and the upper element is excited by the lower DR. The upper element is responsible for generating the higher mode $({\rm HEM}_{12\delta})$ , whereas the lower mode $({\rm HEM}_{11\delta})$ resonates in the entire composite mass. The conjecture has been verified with an S/C-band design using simulated and measured results indicating three different variants. The most improved geometry comprising of a “cone on top of a cylinder” promises 6.5 and 10.3 dBi gains in the lower and upper operating bands with, respectively, 8.3% and 13% matching bandwidth. This newly addressed technique can be of potential use for newer innovations in DRA feed and design.

Wide Dual-Band Circularly Polarized Stacked Rectangular Dielectric Resonator Antenna

Abstract: A wide dual-band circularly polarized (CP) stacked rectangular dielectric resonator antenna (DRA) is presented. The stacked rectangular dielectric resonator (DR) has two layers, and it is excited by an asymmetrical cross-slot. Three sets of degenerate orthogonal modes in the stacked rectangular DR and the slot modes are utilized to realize dual-band CP radiation. It is found that the quasi- ${TE}_{111}$ mode and slot modes are for the lower band, and the quasi- ${TE}_{113}$ and quasi- $ {TE}_{115}$ modes are for the upper band. The proposed antenna was simulated and measured, and the measured results agree well with the simulated ones. The measured 3-dB axial-ratio (AR) bandwidths of the two bands are 9.7% and 20.0%, respectively.

High-Resolution, Far-Field, and Passive Temperature Sensing up to 700 °C Using an Isolated ZST Microwave Dielectric Resonator

Abstract: This paper presents a high-resolution, wireless and passive temperature measurement system up to 700 °C. The sensor is based on a metallization-free monolithic microwave dielectric resonator composed of zirconium tin titanate (Zr0.8Sn0.2TiO4) operating at 2.37 GHz. The external electromagnetic fields of the tracked single mode are adequate for the far-field coupling without the need to use any conducting part on the sensor surface. The measurements are conducted in a light weight refractory bricks oven at a distance of 1.20 m between the sensor and a reader planar antenna connected to a time-domain RADAR-based interrogation unit. This method allows to retain a quality factor ( $Q$ ) higher than 670 at 700 °C, while the $Q$ -factor from other electromagnetic cavity or microwave dielectric resonators degrades below 100, hence limiting the sensing resolution and increasing the sensitivity to the environmental echoes. The effect of temperature on the tracked sensor resonance frequency, signal-to-noise ratio, $Q$ -factor, thermal expansion, and sensing resolution is presented. The concept is suitable for applications working in extreme environments, such as aerospace applications.