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One of the most relevant challenges of next generation in-body devices consists in enhancing the medical applications of wireless networks qualitatively. The current standard does not allow high data rate wireless connections between implanted nodes. UWB systems have been considered as a potential candidate for future in-body devices. To establish a proper link within UWB, antenna matching should...
The wireless link between an implant and an off-body gateway may be difficult to secure due to the fact that electromagnetic waves quickly attenuate as they propagate through human tissues. Depending on the depth of the implant within the body, the signal strength may be quite weak by the time the waves reach the skin. In order to address this problem, a digitally assisted repeater antenna has been...
A simple and wideband subarray for D-band applications is presented in this paper. The proposed multilayer subarray consists of 2 × 2 cavity-backed slot subarray fed by a ridge gap waveguide transmission line. The simulated results show that the proposed subarray has a relative impedance bandwidth of 22.5% with input reflection coefficient better than −10 dB over the 126–158 GHz frequency band. An...
Implantable medical devices are becoming smaller by the day, with more efficient electronics and smaller power demands. Nevertheless, there are some applications in which power demands are inherently high, and solutions must be found in order to keep the devices as small as possible. In this paper, we propose an antenna to be used in wirelessly powering a focal brain cooling implant based on a Peltier...
We present in this paper a design of a high gain antenna for radar-based non-contact measurement systems in the k-band frequency. The proposed antenna consists of a slot on a multi-grooved metal structure (flange) and a frequency selective surface (FSS) acting as a flat lens. Often, grooved (or corrugated) surfaces and frequency selective surfaces are used to enhance antenna gain features. The combination...
Retrodirective antennas used for radiative wireless power transfer (WPT) are typically resonant and exhibit strong backscatter, a limited field of view and small bandwidth. These limitations are here overcome by using an array of long slots fed by parallel plate waveguides (PPWs). It is shown that the array can collect the total power impinging from a remote source over a large field of view and bandwidth...
This paper proposes a new radio frequency (RF) energy harvesting system that operates over the Wi-Fi 802.11 b/g band at low input power levels. The system presented herein achieves good power conversion efficiencies (PCEs) over a power range that extends from (−20 dBm) to (3 dBm). A directive slot antenna is incorporated to drive the rectification process of the designed rectenna. The rectenna system...
An antenna system simultaneously providing a radar function and a secondary communication function with beam agility is proposed. The system is composed of a slotted waveguide (for the communication function) feeding a horn antenna (for the radar function). Direct modulation in four different directions can be obtained for communication provided each radiating slot is equipped with a simple switch.
This paper deals with the design of patch antenna arrays with Ridge Gap Waveguides (RGW) feed networks at 60-GHz band. An array of 64 radiating elements are designed and simulated to demonstrate the good performance of the proposed array. The proposed antenna shows the gain up to 22.6 dBi, efficiency higher than 80% and an impedance bandwidth of 13% covering 59–67 GHz. The results are valuable for...
Two dielectric resonators antenna (DRA) fed through slotted microstrip line for a wideband application is proposed. The two cylindrical DRs are asymmetrically situated with respect to the rectangular coupling aperture center with a defected ground plane. By optimizing the design parameters, two antenna configurations have been achieved: the first covering an impedance bandwidth of about 57%, from...
This paper proposes a dual-polarization parallel plate waveguide (PPW) slot antenna array which has the advantages of high efficiency and low-profile. The antenna array is realized in the multilayer structure. The H-plane waveguide arrays in the low layer and the 2×2-element subarray in the upper layer are employed as the feed networks and radiating part, respectively. An 8×8-element array with height...
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...
In this study, an electrically small, monopole slot antenna based on near-field resonant parasitic (NFRP) elements composed of metamaterial inspired capacitively loaded loop (CLL) elements is designed and analyzed via a commercial full wave electromagnetic solver. The proposed antenna has an operational frequency of 2.4 GHz and it satisfies the limits of an electrical small antenna (ESA) having a...
In this paper, a multilayer substrate integrated waveguide (SIW) cavity-backed slot antenna array with wideband performance is proposed. In order to broaden the operating bandwidth of SIW slot antenna, multilayer cavities with gradually decreased permittivity and expanded aperture sizes are loaded above the slot, which realizes a smooth transition between SIW slot and free space. A wideband feeding...
In this paper, a phased array antenna is designed at millimeter-wave frequency bands for future 5G based smartphone applications. The proposed antenna is a novel open slot-PIFA antenna made on a low cost FR4 board. The antenna array covers a frequency range of 26–32 GHz with a bandwidth of 6 GHz. The antenna exhibits a very good radiation pattern when integrated with the mobile phone chassis. The...
This paper describes the design, simulation and measurement of a dual-band slotted waveguide antenna array for adaptive 5G networks, operating in the millimeter wave frequency range. Its structure is composed by two groups of slots milled onto the opposite faces of a rectangular waveguide, enabling antenna operation over two different frequency bands, namely 28 and 38 GHz. Measured and numerical results,...
The recent progress in terahertz wireless data transmissions using resonant-tunneling-diode (RTD) oscillators is reported. RTD oscillators with wide modulation bandwidth (∼30 GHz) were fabricated, and wireless data transmissions in the 500-GHz range were demonstrated. An error-free transmission data rate up to 22 Gbps and a transmission with bit error rate less than the forward error correction limit,...
This paper describes a low-loss ridge gap waveguide (RGW) to groove gap waveguide (GGW) transition. Transitions from RGW to GGW and viceversa can be advantageously combined leading to very compact feeding networks. Interestingly, these transitions circumvent the 180 deg phase difference in E-plane power splitters, facilitating in-phase corporate feeding networks based on such dividers. Using these...
This paper presents a novel circular polarized slot antenna design using microstrip-ridge gap waveguide technology, it possesses the easy manufacturing since it realizes the gap waveguide with PCB process. The antenna is composed of two substrates, by using the ring slot with a shorted strip on the upper substrate and the EBG textures located on the lower substrate, the circular polarized characteristic...
A K-band slot array antenna is developed by using ridge gap waveguide technology in a single layer metal structure. A power divider of 1:4 is used to feed the ridge gap waveguide and the slots. The power divided itself is fed with a waveguide transition. Detail design of the antenna is presented. The antenna has the impedance bandwidth of 9% at the center frequency of 38.5 GHz, The antenna gain is...
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