The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents performance enhancement of a conventional circularly-polarized (CP) microstrip patch array using anisotropic metasurfaces. In addition to boresight gain, axial-ratio and impedance bandwidth amplifications, sidelobe levels suppression were also focused.
A fully integrated K band high power amplifier was designed and fabricated in 0.18 um CMOS technology. Some design and layout techniques are proposed to reduce the DC bias complexity of this 8-way combined high power amplifier. The measurement result shows that this amplifier achieves 20 dBm saturation output power, 6 GHz 3-dB bandwidth, and flat gain response from 20.4 GHz to 24.1 GHz.
Shortened far-field gain measurement method had been proposed for one of gain measurement methods that does not require replacement of antennas and measurement of distance between antennas. In this study, the shortened far-field gain measurement method was investigated by the simulation of a patch antenna in 2.5 GHz band. Because this antenna is narrow bandwidth and measured distance is relatively...
This paper reviews the past and current research progress in microwave antenna applications using 2D planar metamaterials or metasurfaces. Firstly, we revisit the definitions of metamaterial and metasurface, and the applications of the ultra-thin metasurfaces for low-profile printed antennas in microwave frequency regime, for the purposes of size reduction and performance enhancement. Then we summarize...
Loss evaluation is important in the link budget of the wireless system in the millimeter wavebands. In order to estimate the antenna gain reasonably, the loss factors of the antenna should be evaluated carefully. This report surveys the gains of the antennas, such as the standard horns, the waveguide slot arrays, the post-wall waveguide slot arrays and so on in the millimeter wavebands. As an example,...
This paper presents a high-linearity and high-gain power amplifier for 802.11p standard. The power amplifier is fabricated using InGaP/GaAs HBT technology and packaged in a 5×5mm QFN. A stand-alone integrated passive device (IPD) chip is exploited as the output matching network in the same package. The measured power gain is 25.8 dB at 5 V supply. With a 27 Mbps IEEE 802.11p signal at the center frequency...
This paper investigates a wideband dual-polarized rectangular dielectric resonator antenna (DRA). The DRA is simultaneously excited in its fundamental TE111 mode and higher-order TE113 mode to widen the bandwidth. Their degenerate fields are also excited to obtain a polarization diversity antenna. An overlapped bandwidth of 29.6% (2.88-3.88 GHz), antenna gains ranging from 4.8 dBi to 9.9 dBi, and...
This work presents a dual-band high-gain metamaterial radome which can increase antenna gain. This radome operates at the WiMAX (3.5GHz) band and the WiFi (5.8GHz) band. The refractive index of this radome is designed to near zero. The radiation beamwidth of antenna becomes small and the antenna gain is increasing. The size of this radome is 90 mm × 90 mm. This radome improves antenna gain 2.6 dB...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.