Jaroslav Lacik

Influence of car panorama glass roofs on Car2Car communication (poster)

The Car2Car communication will use a reserved frequency band at 5.9 GHz. One of the key requirements for a Car2Car antenna is that the gain is concentrated in the horizontal plane, which is a problem due to the limited ground plane of a car roof. The influence of roof curvature, roof racks and panorama glass roofs were investigated to quantify them. To the authors knowledge such measurements have not been published yet. Three different antennas were simulated and measured on round ground planes and real car roofs in different configurations. The configuration with a panorama glass roof showed an unexpected high loss of gain in the direction of the glass roof in the range of 15 to 20 dB which result in a drastically reduced communication range to the front direction. This phenomenon is still under investigation.

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A 2 × 2 microstrip patch antenna array fed by a substrate integrated waveguide (SIW) feeding network for 24-GHz radar applications is proposed in this letter. The microstrip patches are aperture-coupled with the feeding network consisting of a perpendicular coax-to-SIW transition and two Y-junction power dividers. The antenna design is performed in the full-wave electromagnetic solver ANSYS HFSS and verified by measurement. At the operation frequency 24 GHz, a fabricated prototype has a gain of 11.1 dBi and a low sidelobe level below -22 dB in the E-plane and -33 dB in the H-plane.

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A microstrip patch antenna fed by Substrate Integrated Waveguide (SIW) is presented in this paper. The antenna operates in centimeter-waveband, at 9 GHz frequency. In the first step, the antenna is modeled in Ansoft HFSS. Influence of the most important parameters on the return loss of the antenna is investigated. In the second step, the final model of the antenna is simulated, fabricated and measured. At the operating frequency, the antenna reaches 8.8% impedance bandwidth (for s 11 better than −10 dB) and 8.2 dBi gain.

2 Microstrip Patch Antenna Array Fed by Substrate Integrated Waveguide for Radar Applications

In this letter, a novel concept of a high-gain Vivaldi antenna operating in the Ka frequency band is proposed. The antenna is fed by the substrate integrated waveguide. The concept overcomes shortcomings of conventional antipodal Vivaldi antenna using dielectric load with printed metal transition and transverse ripples. The added parts are optimized to obtain a wideband high-gain antenna with low cross polarization. The fabricated antenna shows very good performance over the entire Ka band where the measured gain is more than 10.5 dBi.

Microstrip patch antenna fed by Substrate Integrated Waveguide

In this letter, a wideband semisolid skin-equivalent phantom with dielectric properties close to human skin in the V- and W-band is proposed. The constituents of the phantom are deionized water, agar, and gelatin powder. The phantom has been fabricated and validated by an open-ended waveguide method. Since it comprises low-cost constituents and its fabrication does not require special equipment, the phantom can be easily reproduced. The proposed skin-equivalent phantom can be used in the field of on-body antenna and propagation measurement at millimeter waves.

High-Gain Dielectric-Loaded Vivaldi Antenna for

In this letter, we describe the design and simulation of on-body antennas for wireless body area network (WBAN) communication operating in the 61-GHz ISM frequency band. We developed a disc-like concept of an antenna. Instead of a direct connection between a circular disc and a feeding pin, the electromagnetic coupling is used. This concept enables us to obtain relatively broadband characteristics with omnidirectional radiation pattern and vertical polarization suitable for on-body communication. Impedance properties and radiation of the antenna were studied in open space and on a tissue-equivalent phantom representing the human body. Fabricated prototype is well matched from 59.3 to 63.4 GHz. The bandwidth of the antenna is about 7%. An antenna analyzed close to body tissue exhibits efficiency of at least 25% and the maximum gain 5.2 dB in the horizontal plane.

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In this paper, a substrate integrated waveguide linearly polarized rectangular ring slot antenna is presented for centimeter wave applications. Its basic properties are described. The designed antenna at the frequency 10 GHz achieves the impedance bandwidth 4.3 % (the measured value), and the gain 8.2 dBi (the simulated value in Ansoft HFSS).

-Band Applications

This paper deals with the stabilization of MOT method by digital filters. We propose how to design such a filter with using the optimization techniques. The proposed procedure takes into account the important part of the spectrum of excitation signal, so the designed filter do not degrade the accuracy of MOT method. Further, the issue of successful stabilization of MOT method by set of filters is discussed.

Wideband Skin-Equivalent Phantom for V- and W-Band

This paper deals with problems concerning variable impedance of power lines in the measurement of insertion loss of EMI filters. A circuit which represents variable power line impedance was designed and was added into the normal measuring structure of EMI filters. This was applied to an asymmetrical and a non-symmetrical measurement technique. The design, structure of measurement and results obtained are explained in this paper

Wearable Disc-Like Antenna for Body-Centric Communications at 61 GHz

In this paper, a novel low profile 2 × 2 SIW rectangular ring slot antenna array for 60 GHz band is proposed. It radiates linearly polarized wave with maximum radiation in the perpendicular direction to the antenna plane. Experimental results prove that the proposed antenna achieves the impedance bandwidth of 5.7 % for the reflection coefficient less than -10 dB and the gain of 13 dBi.