High efficiency reflectarray using smooth tapering in phase pattern on antenna surface

Abstract

measured S-parameter of the DUT, including the non-ideal characteristics of the test equipment and the parasitic effects of on-wafer probe pad and associated interconnection. The GaAs pHEMT device with the CB-CPW TL structure is examined to show the validity of the one-tier de-embedding approach up to 90 GHz. The proposed method and the measured results would be very useful for device characterization and modeling of RFIC designs.ABSTRACT: In this article, a novel method is introduced to design a high efficiency and broadband reflectarray. Several techniques will be introduced for designing wideband reflectarray. First, by using fractal ring unit cell with 700 phase range; second, by smoothing phase Figure 4 Measurement results for a GaAs pHEMT DUT biased at V GS ¼ À0.4 V and V DS ¼ 3.0 V for (a) input reflection, (b) forward transmission, (c) reverse transmission, and (d) output reflection. [Color figure can be viewed in the online issue, which is available at wileyonlinelibrary.com] ABSTRACT: A new wavelength initialization technique for WDM-PON (wavelength division multiplexed-passive optical network) system is proposed, where it uses allocated light path over optical link. Compared with other techniques, it is expected that the smallest size and the lowest cost for implementing this will be achieved in the real network. V C 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:753-755, 2013; View this article online at wileyonlinelibrary.com.

Efficiency enhancement techniques of microwave and millimeter‐wave antennas for 5G communication: A survey

“…Using a progressive phase distribution of unit cell elements of a reflect array, high efficiency and gain performance may be attained. Increased phase range is determined by the unit cell element's aperture size and focal length to diameter (f/D) ratio 24,48,75‐79 …”

“…Increased phase range is determined by the unit cell element's aperture size and focal length to diameter (f/D) ratio. 24,48,[75][76][77][78][79] Reflect array with fractal ring unit cell with 700% phase swing and smooth phase tapering delivers 66% radiation efficiency by offering complete 360 • phase swing. 75 To improve the efficiency of the reflect array, two or more elements might be used.…”

“…24,48,[75][76][77][78][79] Reflect array with fractal ring unit cell with 700% phase swing and smooth phase tapering delivers 66% radiation efficiency by offering complete 360 • phase swing. 75 To improve the efficiency of the reflect array, two or more elements might be used. Modified circular and square concentric rings are used as unit cells in paper.…”

A circular polarized reflectarray antenna with electronically steerable beam and interchangeable polarizations

“…The spillover and illumination taper efficiencies have the greatest effect on the total efficiency of the reflectarray antenna. Therefore, the antenna total efficiency can be estimated by equation (12), [22, 23]: where, q is exponent of the feed pattern in Cos q ( θ 0 ) and ϕ RA /2 is subtended angle between the center of the feed and the reflectarray aperture (Fig. 8(b)).…”

“…The spillover and illumination taper efficiencies have the greatest effect on the total efficiency of the reflectarray antenna. Therefore, the antenna total efficiency can be estimated by equation 12, [22,23]:…”