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Reliable yet fast surrogate models are indispensable in the design of contemporary antenna structures. Data-driven models, e.g., based on Gaussian Processes or support-vector regression, offer sufficient flexibility and speed, however, their setup cost is large and grows very quickly with the dimensionality of the design space. In this paper, we propose cost-efficient modeling of antenna structures...
In this paper, a study is conducted into using semiconductor materials in designing nanoantennas for solar energy harvesting. Different thin wire dipole nanoantennas made of carbon, heavily doped Ge and heavily doped Si are designed and their performance is compared with metal nanoantenna made of gold. Method of moments (MoM) is employed to numerically solve Hallen's integral equation in order to...
This paper presents a low cost Gaussian process (GP) modeling technique for antenna responses that exhibit highly oscillatory behavior as a function of frequency. Using a judiciously constructed composite covariance function that is able to capture the quasi-periodic behavior of the responses, an accurate interpolant could be established with far fewer training points than would normally be considered...
Geolocation of wireless emitters using Received Signal Strength Difference (RSSD) and site-specific propagation models offers the advantages of increased accuracy and operation with non-cooperative emitters (where emitted power level or positional information such as GPS from the emitter is unavailable) over more commonplace Received Signal Strength (RSS) systems. An important factor influencing the...
In this paper, the antennas performances for the 5.2 GHz 802.11n network are compared by three different access points with 3 antenna configurations based on the simulated throughput derived from measurements in a two-storey house. The aim here is to outline a methodology for access point performance taking account client orientation, MIMO data streams that can be supported and finally a total throughput...
In this paper a new compact planar monopole-like multiple-input-multiple-output (MIMO) handset antenna is proposed. The antenna system consists of two identical antennas with a defected ground arrangement for low correlation and high isolation characteristics. The antennas are oriented horizontally at the no-ground portion located at the top and bottom of the FR4 50 χ 102 mm2 circuit board. The proposed...
A novel concept for a dual-polarized microstrip antenna array with a center frequency of 23.75 GHz is introduced. The array is composed of ten single square patch elements having equal resonance frequencies in both directions. The microstrip patches are rotated by 45 ° and linearly aligned to obtain a fan beam antenna characteristic. The feed structure is in seriesparallel configuration with best...
A novel quadruple feeding mechanism for a rectangular patch antenna is proposed. A successive phase shift caused by path inequality between four possible symmetrical feeding points is introduced, in order to achieve wideband operation at the 2 GHz frequency band. This work is an extension to the idea of acquiring a pair of resonances and forcing them to behave in a consolidated way. This concept is...
A dual band antenna for machine-to-machine applications in ISM and GSM bands is presented. The antenna is compact and operates at 409–442 MHz and 800–1224 MHz, with good efficiency and gain across the frequency bands. A parametric investigation of key geometrical parameters is reported.
This paper deals with a method to miniaturize an artificial magnetic conductor using interdigital capacitances. An artificial magnetic conductor with a resonance frequency of 2.66 GHz is designed and manufactured. The size of a unit cell is 15 χ 15 mm2 or 0.13 × 0.13 λο. The measurement result shows a resonance frequency slightly higher than the simulated one. Two circuit models are proposed to model...
For high speed digital data connection such as WiMAX or WLAN, a good signal to noise ratio (S/N) is required. One way to keep up a good S/N-value while moving is the use of high gain antennas with a directive antenna beam. However, often there is insufficient room to place high gain antennas in a vehicle. On top if this, it is becoming increasingly difficult and more packed in the car, so that progressive...
This paper presents two innovative designs of miniature wearable microstrip antennas for biotelemetry in the Industrial, Scientific, and Medical (ISM) band (2.4–2.48GHz). The two proposed designs employ stacked triangular guiding patches as well as slotting of the patches. This results in a considerable size reduction of 60% with respect to the original antenna volume. Both designs have dimensions...
In this invited presentation I describe how we prepare for 5G in my research division. The background is that we have contributed to 3G and 4G developments with two commercial successes: the hat-fed reflector antenna for backhaul radio links, and Bluetest reverberation chambers for OTA (Oer-The-Air) characterization of devices with MIMO and OFDM. 5G means Gbit/s data rates, for which higher frequencies...
This paper discusses the feasibility of two multi-probe over-the-air antenna test methods at frequencies higher than 6 GHz. The two methods considered in this paper are prefaded signals synthesis (PFS) and plane wave synthesis (PWS) methods. Both methods suffer from huge challenges of the large number of dual-polarized probes required in emulating realistic standing waves in the antenna test zone,...
In this work, we propose a computationally efficient procedure for dimension scaling of antenna structures. The fundamental component of our methodology is an inverse surrogate model that relates geometry parameters of the antenna structure of interest to its operating frequency. The surrogate is constructed using several antenna designs obtained at the level of the coarse-discretization EM simulation...
The results of the comparative evaluation of thermal noise parameters of plasma, dielectric and metal microwave antennas in a wide frequency range are given.
In this paper, integration of one dimensional wire grid antennas and solar cells are investigated. In such a structure, solar cells are centered inside wire grid loops. Due to characteristics of wire grid antennas, we are able to minimize antenna shading on the solar cells to a negligible level while keeping the antenna efficiency within an acceptable range. First, a one dimensional wire grid antenna...
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