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Chassis antenna cavities were recently introduced as large, hidden, antenna modules. Testing different antenna configurations inside the module would require cutting several holes into the cavity floor. Manufacturing of several prototypes is not feasible, especially for carbon-fiber reinforced polymer chassis; flexible solutions are desired. Exchangeable cavity bases for chassis antenna cavities are...
Composite reflector based radio telescopes are next generation instruments for radio astronomical observation which provide several benefits over traditional metal-based radio telescopes. These benefits include: improved thermal characteristics, increased surface efficiency, reduced structural weight, etc. One of the challenges in radio telescope design is maintaining the performance of the optical...
The calculation of the received energy is important to determine the interference for systems in frontier zones. The Amazonian region is a tropical rain forest, which propagation impairments are vaguely studied. Measured data concludes that in this region, the traditional propagation models like long-range and vegetation, do not explain the received power. This paper introduces a new propagation path...
A multi-band loop antenna with a band stop filter is proposed for the application of mobile communications devices. The antenna is compact in comparison with conventional mobile antennas as only one resonator is used to realize multi-resonance operation. It has been demonstrated that the proposed antenna can cover all the commonly used LTE (Long Term Evolution) frequency bands including 698–960 MHz...
We present a new circularly polarized microstrip antenna with an airgap for multiple Global Navigation Satellite System (multi-GNSS) receivers. The airgap structure substantially increases antenna gain and bandwidth. We examined the antenna properties by simulation and measurement. The measured results show the −10 dB bandwidth of 4.9% and the maximum antenna gain above 7.0 dBi over the whole multi-GNSS...
In this letter, the design of a novel irregular DNA-like left-handed meta-structure is presented. The meta-element consists of four Mirror symmetry helix, between which some intermittent metal rods are introduced. Based on the transmission line theory, an equivalent circuit of the left-handed unit is modeled. And then we design a multi-band antenna by applying the proposed left-handed meta-elements,...
For aperture sizes greater than 0.25λ the Vivaldi antenna design and implementation is quite easy. Criticality sets in, if the aperture size is less than 0.25λ. Keeping this aspect in view, in this paper, parametric studies have been carried out on a Vivaldi antenna with a novel taper with exponential plus sinusoidal function. For matching at the lower frequency end, a novel additional circular cavity...
A broadband positioning 2×1 rectangular patch array antenna, loaded with crescent-like slits near corner as phase control units, is proposed for GPS and Beidou applications. The proposed antenna consists of two ortho-placed square radiation patches, which provide the antenna with a wider band of circular polarization. Near the corners of the patches, each radiation edge is loaded with a crescent-like...
This paper presents a body-coupled ultra-wideband (UWB) antenna configuration for near-field microwave imaging applications. An UWB antenna is designed for wearable applications that will be require direct contract with the human body. In order to optimize antenna size and near-field radiation characteristics, to match the underlying body tissue, a stretchable dielectric spacer (a mixture of polydimethylsiloxane...
This paper presents a brief review of low THz antennas and discusses their corresponding manufacturing techniques. In addition, a new antenna is introduced for the 300 GHz frequency band. The design is an all-metal structure with interesting features such as compactness, high gain, and wide operational bandwidth. These characteristics make it a promising solution for future high-speed THz communication...
A 3D discrete mixed Fourier transform method is proposed for modeling the wave propagation over an impedance ground in 3D. The continuous and discrete formulations of the propagators are presented. The discrete formulation achieves self-consistency with respect to the discrete electromagnetic theory. Numerical tests are performed to compare the two propagators. Both are shown to be accurate. Therefore,...
The aim of this paper is to describe the current status and future utilization of multi band automotive radar sensors. One of the major struggles is to find a reasonable tradeoff between maximal ambiguity in range and range resolution. The content of the paper consists of the state-of-the-art as well as an application of a new approach using a multiband radar sensor. Measurement results of a multiband...
We report empirical observations for both small and large scale fading in urban street canyons at 60 GHz. The observed (average) de-correlation distance of small scale fades was less than 4λ, with spatial X-factors > 25 dB. We observed a path-loss exponent close to Friis (1.9). The shape of the normalized auto-correlation function of shadow fades was well described by exponential terms whose amplitudes...
In this paper we have introduced transparent wire-grid type conductive film antenna, made of Ag-paste. The wire-grid has wire-width of only a few microns and makes the conductive film almost invisible. The antenna is designed to cover an ultra-wide band (UWB) from 2 to 6 GHz and the radiating part is made with different mesh sizes of the conductive film and ground has been taken with continuous sheet...
In this paper, a split ring is proposed as a phasing element for wideband reflectarray design. A full 360° phase coverage is obtained through changing gap size of the split ring element. The phase curve is a straight line at central frequency and parallels to each other when the working frequency deviates from the central frequency. Then a reflectarray with a circular aperture of 300 mm in diameter...
New concepts of car antennas for terrestrial communication based on Long Term Evolution technology (LTE), 5G and Car2Car/Car2X are discussed with regard to their environment in different mounting positions. Aspects of mutual coupling and interaction with sensitive satellite services are investigated. Examples of measured data are shown for problems of interference towards Satellite Digital Audio Radio...
Due the implementation of Digital Dividend for the 4G/5G networks, several studies have considered the impact of the coexistence of DTT and LTE services. The coexistence scenarios on the frontier is a novel subject and the authors did not found technical studies relating two countries. Due the particular case of the frontier between Colombia and Brazil, where two DTT services are presented (DVB-T2...
In this paper we present a highly compact and low-cost antenna solution based on a dielectric lens and a waveguide horn array feed for operation in the 57–64 GHz frequency band. The antenna is targeted for applications in point-to-point backhaul systems for Small Cell mobile access networks and features a beamforming capability providing self-alignment for ease of installation and improved link stability.
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