Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
A simple circularly polarized (CP) antenna array is proposed for millimeter-wave applications. The proposed CP antenna array has a two-layer structure, which is easy for fabrication. A circular loop with a parasitic element is used as the radiation element for wideband operation. It is shown that the proposed 4×4 CP antenna array can achieve a gain of 13–16 dBi from 28.5 to 31.5 GHz.
In this paper, a miniaturized wideband dual-polarized antenna loaded with parasitic loops and straight dipoles has been proposed for 2G/3G/4G base-station applications. Firstly, by loading four parasitic loops to the corners of regular crossed loop dipoles, a miniaturized structure and enhanced impedance bandwidth can be obtained. Then, based on the miniaturized structure, two straight dipoles are...
The important factors increased the efficiency of the antenna to support users in the current technology are necessary wide impedance bandwidth, high gain, and low back radiation. In this paper, the antenna composed of the curved strip electric dipole and the vertically-oriented short patch is presented. The measured impedance bandwidth of 60.9% (SWR<2) from the frequency range of 1.62–2.9 GHz...
This paper will present a series of novel polarization reconfigurable antennas for modern wireless applications. First, three multi-linear polarization reconfigurable antennas with the switchable 0°, +45°, 90° and −45° polarizations are investigated for mitigating the polarization mismatching problem in wireless biomedical applications. Three distinctive techniques were adopted to realize the same...
This paper proposes a new low-profile high-gain wideband gradient refractive index (GRIN) lens fed by a magnetic-electric (ME) dipole antenna. As a constituent part of this lens, a novel sub-wavelength nonresonant metamaterial unit cell composed of 3-layer substrates is also proposed. By applying Rogers 5880 and air as the top and bottom layers, high and low refractive indexes can be achieved for...
We present an ultra-wideband antenna for mm-wave applications. The antenna consists of a bowtie patch integrated with the feeding network. The feeding network is implemented as a multilayer substrate structure. The differential excitation of the bowtie is performed in a similar way to Magneto-Electric Dipoles and Marchand baluns. The simulated antenna shows a relative bandwidth of 2.6 : 1 with a reflection...
The design of a single layer wideband circularly polarized 2 × 2 microstrip array at X-band frequencies is described. The antenna elements are shorted annular patches and the array is driven with a sequential-phase feeding network. The array is modelled on a 1U CubeSat. The performance of the array is compared to a single element microstrip antenna.
A broadband linear to circular polarization reflector is proposed. To suppress the radiation from surface wave (SW), four corners of the square metasurface (MS) reflector is removed. By this modification, the 3-dB axial ratio (AR) bandwidth of 27% can be obtained at the center frequency of 8.8 GHz. In this paper, the detail discussion about the principle of SW resonance suppression and the guideline...
Recently, a cloaking technology using reflecting elements has been marked. Cloaking devices using reflectarray have simple and very thin structure, so they are especially suitable for cloaking. This paper proposes a carpet cloaking using wideband reflectarray.
The steps to design a 4 by 4 Butler matrix in groove gap waveguide technology are presented. The operation frequency has been selected as one of the bands candidates for future 5G systems (26 GHz). The different components of the matrix are designed and optimized to be wideband and low loss.
This paper proposes a novel design of low profile wideband artificial magnetic conductor (AMC) surface structure. The ±90° reflection phase bandwidth of the AMC surface is 7.93–12.23 GHz (S11≤ −10 dB), while the 0° reflection phase center frequency is 10 GHz. With the utilizing of the 6 × 6 AMC surface, a patch antenna can achieve a bandwidth enhancement of 233% and increased gain of more than 2 dB...
For the first time, we propose a novel quasi-yagi end-fire antenna for wideband applications such as high resolution biomedical imaging, wireless backhaul communication and chip to chip communication in millimeter wave frequency band (67.5–107GHz). The designed antenna covers a wideband of 39.5 GHz by achieving a fractional bandwidth of more than 45%. The gain of the antenna ranges from 4–6.58 dBi...
In this letter, a Vivaldi antenna with wideband RCS reduction using Electromagnetic Band Gap Absorbing Structure (EBGAS) is designed. The EBGAS coveres on the antenna ground. The EBGAS constructed by split rectangular ring loaded with resistors and dielectric spacer. Compared with the metal ground Vivaldi antenna, RCS has reduced about 15 dB in the frequency band of 4–18 GHz and almost without gain...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.