Low-loss bandpass antenna-filter-antenna arrays for applications in quasi-optical systems

Abbaspour-Tamijani, A.; Rebeiz, Gabriel M.

doi:10.1109/eumc.2005.1610104

Cited by 8 publications

(3 citation statements)

References 3 publications

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“…To enable a quantitative evaluation of the proposed topology, we consider a LEPA configuration where the PA is implemented as an array of x-directed electric dipoles and the LA is implemented as an array of slot-based antenna-filter-antenna (AFA) elements [12,13], with y-directed slot antennas on the side facing PA and x-directed slot antennas on the opposite side.…”

Section: Analysis Methodsmentioning

confidence: 99%

“…For analysis, Friis' formula and geometric distance between AFA elements and the feed antenna are used to calculate the complex amplitude of the incident wave at the input of each AFA cell and the simulated element transmission coefficients are utilized to reconstruct the aperture distribution over the output side of the LA and, in turn, the far field. For simple feed and LA systems, it has been shown that this hybrid analysis method produces accurate predictions of the overall gain and radiation pattern for observation angles within the main lobe and first two sidelobes [13]. In the case of LEPA, where the distance between LA and PA can be much smaller, the method can be modified by using a Green's function calculation instead of Friis' formula to find the input amplitude for each AFA element.…”

Section: Analysis Methodsmentioning

confidence: 99%

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Enhancing the Directivity of Phased Array Antennas Using Lens-Arrays

Abbaspour-Tamijani¹,

Zhang²,

Pan³

2013

PIER M

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Small phased-array antennas can be combined with dielectric lenses or planar lens-arrays to form directive beam-steering system. The use of the lens increases the size of the radiating aperture and enhances the directivity of the phased array, but it also reduces its scan field of view. However, the effect can be controlled by properly designing the phase delay profile across the lens. This paper presents the formulation and methodology for designing modified lenses that can allow the desired scan angle. The utility and limitations of the proposed approach will be illustrated by considering several design examples. Simulations suggest that a directivity enhancement of > 2 dB and wide scan field of view (up to 45 • off boresight) can be obtained for compact radiation systems employing small lenses and short separations between the lens and phased array. Larger directivity improvements in the range of tens of dB's are possible in systems with limited scanning capability by employing large lenses and greater phased array-lens separation. Ease of implementation and the ability of the proposed topology to adapt to the system requirements make this topology an interesting candidate for various millimeter-wave radio applications.

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Section: Analysis Methodsmentioning

confidence: 99%

Section: Analysis Methodsmentioning

confidence: 99%

Enhancing the Directivity of Phased Array Antennas Using Lens-Arrays

Abbaspour-Tamijani¹,

Zhang²,

Pan³

2013

PIER M

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show abstract

“…The advantage of utilizing slot antennas is their potential to result in very low-loss arrays [19]. The slot lengths are designed for resonance at the center of the operation band and the slot widths are adjusted for the required value of radiation bandwidth (equivalent to of the filter).…”

Section: B Design Methods and Circuit Modelmentioning

confidence: 99%

Study of 2-bit Antenna–Filter–Antenna Elements for Reconfigurable Millimeter-Wave Lens Arrays

Cheng

Abbaspour-Tamijani

2006

IEEE Trans. Microwave Theory Techn.

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This paper presents a new reconfigurable antenna-filter-antenna (AFA) element based on slot antennas and switchable resonators. This reconfigurable AFA can operate in four modes of operation as a three-or four-pole filter, and yields a 2-bit variable phase delay. As a result, the multimode AFA can be used as the building block of 2-bit adaptive lens arrays. This paper details design, modeling, and miniaturization of the reconfigurable AFA, and demonstrates its performance through preconfigured prototypes. The proposed AFA has a loss of 1.4-1.6 dB measured at 32 GHz in both three-and four-pole filter modes, and exhibits a frequency response that is almost insensitive to the angle of incidence. Several proof-of-concept fixed lens arrays have been also fabricated for output beams scanned to 0 , 15 , 30 , 45 , and 60 in the -and -plane. The measurement results show that the output beam can be scanned to 60 in both principle planes, with a worst case sidelobe level of less than 11 dB and a scan loss that hardly exceeds the theoretical limit.Index Terms-Antenna-filter-antennas, beam steering, frequency-selective surface (FSS), microelectromechanical systems (MEMS) antennas, phase shifters, reconfigurable antennas.

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Low-loss lens-array for wide-scan millimeter-wave beam-steering

Cheng

Abbaspour-Tamijani

2007

2007 IEEE Antennas and Propagation Society International Symposium

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Low-loss bandpass antenna-filter-antenna arrays for applications in quasi-optical systems

Cited by 8 publications

References 3 publications

Enhancing the Directivity of Phased Array Antennas Using Lens-Arrays

Enhancing the Directivity of Phased Array Antennas Using Lens-Arrays

Study of 2-bit Antenna–Filter–Antenna Elements for Reconfigurable Millimeter-Wave Lens Arrays

Low-loss lens-array for wide-scan millimeter-wave beam-steering

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