Reconfigurable scan‐beam hollow patch reflectarray antenna loaded with tunable capacitor

Hajian, M.; Kuijpers, B.; Buisman, Koen; Akhnoukh, A.; Plek, M.; Vreede, L.C.N. de; Zijdeveld, J.; Ligthart, L.P.

doi:10.1002/mop.24050

Cited by 8 publications

(5 citation statements)

References 16 publications

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“…Second, it eliminates the complexities and losses associated with beamforming networks and expensive transmit/receive modules of phased array antennas . The multibeam, electronic scanning of a reflectarray can be achieved with good beam pattern properties and polarimetric isolations . However, compared to the reflector antenna, one of the most severe drawbacks of a reflectarray is the narrower bandwidth performance, which is limited by both the narrow bandwidth behavior of microstrip elements and the different spatial phase delays in a large aperture .…”

Section: Introductionmentioning

confidence: 99%

A X/Ku dual‐band reflectarray design with cosecant squared shaped beam

Pan

Zhang

2014

Micro & Optical Tech Letters

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low band, the left-handed transmission line is not very required. The measured isolation between the two pass bands is >54 dB at the low band and >41 dB at the high band.As shown in Figure 5, the quadplexer has the measured insertion losses at the low band (882-960 MHz) less than 3.0 dB. For high band (1.85-1.99 GHz), the insertion losses are less than 3.0 dB. The measured return losses are less than 10 dB at all the pass bands of the quadplexer. The isolation between the low and high bands is >60 dB, which is higher than that of the diplexer since the duplexers isolate between the bands further. CONCLUSIONThis letter presents a low-loss lowpass-highpass diplexer and quadplexer. A simple 50-X transmission line at the lowpass filter side maximizes the lowpass channel impedance at the highpass frequency band, resulting in low loss and high isolation (>54 dB). To minimize the diplexer size, high impedance meander lines and stepped impedance transmission lines are used. The measured and full-wave EM simulated results of the diplexer show a good agreement and the quadplexer has a designed transmission performances in all four low and high pass bands. ABSTRACT: A X/Ku dual-band center-fed microstrip reflectarray antenna with cosecant squared shaped beams has been developed. The circular reflectarray has a radius of 0.3 m and a flat aperture that emulates a cylindrical reflector antenna. The reflectarray is designed for two frequency bands: 10 GHz (X band) and 15 GHz (Ku band). Crossdipole elements and double-ring elements are uniquely applied on a dual-layer structure to achieve the desirable dual-band operations. As the two operation frequency bands are close to each other, the coupling effects of the dual-band reflectarray elements are investigated, and the unit cell design is optimized in simulations to suppress the interband interference. A phase-only synthesis technique for cosecant squared patterns is also discussed and realized. For demonstration purpose, prototype antenna is fabricated and measured and the measured results are compared with the simulation results.

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Section: Introductionmentioning

confidence: 99%

A X/Ku dual‐band reflectarray design with cosecant squared shaped beam

Pan

Zhang

2014

Micro & Optical Tech Letters

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“…In [92], a single varactor diode was used to load a transmission line stub in an aperture-coupled patch configuration. Capacitive loading of hollow patches with varactor diodes was studied in [93].…”

Section: Varactor Diodesmentioning

confidence: 99%

Beam-Scanning Reflectarray Antennas: A technical overview and state of the art

Nayeri

Yang

Elsherbeni

2015

IEEE Antennas Propag. Mag.

182

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A u g u s t 2 0 1 5 1045-9243/15©2015IEEE detailed overview of various design methodologies and enabling technologies for beam-scanning reflectarray antennas is presented in this article. Numerous advantages of reflectarrays over reflectors and phased arrays are delineated, and representative beam-scanning reflectarray antenna designs are reviewed. For limited field-of-view beam-scanning systems, utilizing the reflector nature of the reflectarray antenna and the feed-tuning technique can provide a simple solution with good performance. On the other hand, for applications where wideangle scan coverage is required, utilizing the array nature of the reflectarray and the aperture phase-tuning approach are the more suitable choices. There are various enabling technologies available for both design methodologies, making them a suitable choice for the new generation of high-speed, high-gain beam-scanning antennas. Microstrip reflectarraysSince the revolutionary breakthrough of printed antenna technology, microstrip reflectarrays have emerged as a new generation of high-gain antennas, combining many favorable features of both reflectors and printed arrays as well as offering an alternative design with low-profile and low-mass features [1], [2]. The aperture of a reflectarray antenna consists of elements arranged in a certain grid that are designed

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“…This was calculated as (5) where is expressed in dB and is calculated for the incidence angle of 22.2 .…”

Section: B Simulation Of Radiation Characteristicsmentioning

confidence: 99%

Reconfigurable Reflectarrays Based on Optimized Spiraphase-Type Elements

Rodriguez-Zamudio

Martinez-Lopez

Rodriguez-Cuevas

et al. 2012

IEEE Trans. Antennas Propagat.

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Reconfigurable spiraphase-type reflectarrays based on ring slot resonators with switchable radial stubs are presented. The mathematical model of the infinite array was used to optimize the spiraphase-type element at 36.5 GHz. The optimization goals were to minimize the dissipative loss in the p-i-n diode switches and to reduce the cross-polarization radiation. The mathematical model of the finite array was then used to simulate the radiation characteristics of a reconfigurable reflectarray with 277 optimized elements for different scanning elevation angles . The calculated aperture efficiencies were 0.42, 0.40, 0.36, 0.25, 0.16, and 0.12 for equal to 0 , 20 , 30 , 40 , 45 , and 50 , respectively. For validation of the numerical simulations, three 277-element reflectarrays for fixed of 0 , 20 , and 30 were designed. Metal strips and open circuits were used instead of the forward and reverse p-i-n diode states, respectively. These reflectarrays were then fabricated and tested, demonstrating aperture efficiencies equal to 0.41, 0.40, and 0.28 for equal to 0 , 20 , and 30 , respectively. Measured characteristics agreed satisfactorily with theoretical predictions.

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Reconfigurable scan‐beam hollow patch reflectarray antenna loaded with tunable capacitor

Cited by 8 publications

References 16 publications

A X/Ku dual‐band reflectarray design with cosecant squared shaped beam

A X/Ku dual‐band reflectarray design with cosecant squared shaped beam

Beam-Scanning Reflectarray Antennas: A technical overview and state of the art

Reconfigurable Reflectarrays Based on Optimized Spiraphase-Type Elements

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