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Recent developments in high frequency inductive wireless power transfer (WPT) mean that the technology has reached a point where powering small autonomous drones has become feasible. Fundamentally, drones can only carry very limited payloads and thus require light-weight WPT receiver solutions. The key to achieving light weight is operating the WPT system at high frequency: this allows both the coils...
A recently published paper presented a novel concept for obtaining frequency reconfigurable behavior by combining multiple antenna elements and weighting the feed signals for each element. In this paper, we clarify some concepts presented in that paper and analyze the antenna structure in more detail.
This paper presents the extraction of the modes resonating inside a mode-stirred reverberation chamber using the Matrix Pencil method. An increasing time-window technique is investigated as a process to discriminate the true modes and the spurious ones that appear due to the measurement noise.
We are presenting a new application of microwave microscopy for the diagnostic of the lightning strike protection mesh used in composite aircraft skin. With this new approach it is possible to resolve defects as small as one cut strand under the paint. We also discuss its ability to measure the paint thickness.
Metamaterial-inspired near-field resonant parasitic (NFRP) electrically small antennas (ESAs) have been designed and experimentally validated to have not only high radiation efficiencies, but also multi-functionality, large bandwidths, high directivities and reconfigurability. These expanded capabilities have been attained by introducing more complex meta-structures, i.e., multiple NFRP elements loaded...
The purpose of this draft is to introduce a compact CPW-fed antenna with WLAN band notched characteristics. For band notched characteristics, an inverted L-shaped structure is used on the surface of radiator. The proposed design has overall size of 25 × 25 × 1.6 mm3 and covers the entire UWB spectrum from 3.02 GHz to 11.34 GHz except the notch band from 4.9 GHz to 6.2 GHz. High concentration of surface...
A compact dual-wideband circular patch antenna is designed for implanted biomedical data telemetry systems. Several miniaturization techniques were applied to have the resonance at the desired frequencies. The antenna has a radius of 7.5 mm, a thickness of 1.92 mm and a total volume of 340 mm3. The antenna covers MedRadio (401–405 MHz), MICS (402–405 MHz), and ISM (433.2–434.8 MHz, 2.4–2.5 GHz) bands...
Two implantable antennas radiating at the Industrial, Scientific, and Medical (ISM) frequencies 868 and 915 MHz were proposed to be employed in a vaginal sensor. These structures were developed in the context of the industrial project “Vel'Phone sensor” funded by Medria, a French company for monitoring services. The compact antennas consist on a meander monopole and a metamaterial (MTM)-inspired monopole...
In this paper a ring resonator (RR) based band pass filter (BPF) is integrated in the power divider for simultaneous filtering and equal division functions. The proposed co-axial feeding mechanism for the RR ensures the BPF response. Exploiting band-pass characteristics and matching the filter to 70.7 Ω, the RR BPF is integrated in place of the conventional quarter wave transformer in the power divider...
By augmenting several classes of metamaterial-inspired near-field resonant parasitic (NFRP) electrically small antennas (ESAs) with active (non-Foster) circuits, we have achieved performance characteristics surpassing their fundamental passive bounds. The designs not only have high radiation efficiencies, but they also exhibit large frequency bandwidths, large beam widths, large front-to-back ratios,...
Characteristic mode control via partial coating of reactive components on top of conducting surfaces will be investigated in this study. The objective of the research is to lower the resonant frequency of a particular characteristic mode that has the desired radiation pattern, and excite it for radiation. The control can be implemented by loading capacitive and inductive components on top of conducting...
The authors have previously proposed a tunable meander-line loaded monopole antenna. In this paper, the antenna structure proposed by the authors is modified to operate as a dual-mode antenna with very good frequency bandwidth. Characteristic mode analysis is performed on the modified antenna structure to investigate the suitability of the novel structure for dual-mode operation. Then, a dual-mode...
High Frequency Radio Frequency Identification (HF RFID) system based on Magnetically Coupled Reader Resonator Coils (MCRRC) is reported. The proposed system consists of reader antenna including small resonant coil operating by magnetic coupling with the tag coil. In the proposed system, the reader and tag impedances are modified. The equivalent electrical model is used to express the equivalent impedance...
This paper proposes an HF (High Frequency) transmitting coil less sensitive to the angular and position misalignments of the small receiving coil. The DDC (Distributed Diameter Coil) shape and TLA (Twisted Loop Antenna) allow respectively minimizing the disturbance of the magnetic link due to the lateral misalignment and the relative tilting direction of the transmitting coil to the receiving coil...
We present in this paper a novel wideband circularly polarized dielectric resonator antenna (DRA) covering the complete Global Navigation Satellite System (GNSS) frequency band (1150–1620 MHz). This antenna, considering its simplicity, provides excellent performance in terms of gain, axial ratio and beamwidth across the entire operating bandwidth while being relatively low profile and with a design...
In this paper, a novel dual band compact antenna based on planar inverted-F antenna (PIFA), ceramic substrate and interdigital coupled structure are proposed. It has compact size with the dimensions of 10.2∗3∗2.5mm3. The operating mechanisms are illustrated and the study on the key dimension parameters is given. Both the simulation and measurement results are shown to verify the good performance of...
The main objective of this contribution is to introduce a novel multi-tag anti-collision protocol based on Look-Up-Table (LUT) scheme. The proposed protocol includes an enhancement for the spectrum utilization and coding capacity. This is accomplished by transferring the tag-ID to be stored in a table in the main memory of the reader (look-up-table). Moreover, the unique signature of each tag represents...
A design methodology based on the combination of the Theory of Characteristic Modes (TCM) with an Optimization Algorithm, to design a wideband Electrically Small Antenna (ESA) is presented. Unlike other design techniques, loads or matching networks are not needed at the input of the antenna. A design example of an Inverted-L Antenna (ILA) is presented to validate the effectiveness of this technique.
A new metamaterial based subwavelength resonators configuration for X-band hollow waveguides is proposed and its application as a filter and crack detection sensor is discussed. The structure is composed of a complementary rectangular split ring resonator embedding a T-type resonator. The filter has a 0.9 GHz bandwidth at 9.11 GHz resonance frequency. The comparison between a perfect surface and a...
A novel Phoenix cell for large band reflectarray antennas is presented here. The cell starts with a simple square patch whose phase shift is controlled by its sides' length. The size of the patch is then fixed and open-stubs with variable length are connected to it. To complete the phase range at the central frequency, the stub-loaded patch then shrinks gradually until it disappears completely allowing...
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