The Experimental System PALES: Signal Separation with a Multibeam-System Based on a Rotman Lens

Worms, Josef; Knott, Peter; Nuessler, Dirk

doi:10.1109/map.2007.4293939

Cited by 11 publications

(2 citation statements)

References 18 publications

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“…The purpose of these dummy ports is to absorb the reflected unwanted energy from the sides of the cavity and reduce the incident reflections to prevent distortion effects from affecting the phase performance . However, the process of energy absorption at the side walls of the lens can also be achieved by using radial stubs for the microstrip model and a special lossy material for the parallel‐plate waveguide model . Generally, the feeding ports are used to excite the lens with the operating frequency.…”

Section: Introductionmentioning

confidence: 99%

“…12 However, the process of energy absorption at the side walls of the lens can also be achieved by using radial stubs 8 for the microstrip model and a special lossy material for the parallel-plate waveguide model. 13,14 Generally, the feeding ports are used to excite the lens with the operating frequency. They also have a 50 Ω characteristic impedance.…”

Section: Introductionmentioning

confidence: 99%

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A new impedance matching approach for microstrip Rotman lens based on analyzing the standing wave pattern of an electric field

Al-Obaidi

Abdullah

Dahlan

et al. 2019

Micro & Optical Tech Letters

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This article proposes a new impedance matching method to provide an energy transformer between 50 Ω beam ports and the cavity of a Rotman lens. The model is derived from a quarter length transition line impedance transformer. The suggested matching technique is based on determining and analyzing standing wave patterns of electric field signals underneath feeding lines of the beam ports when they are excited with a designed frequency of 2.45 GHz. The proposed approach demonstrates the ability of the model to achieve an acceptable return loss compared to traditional taper line model matching methods, even though it increases the operating bandwidth frequency based on the measured results. Moreover, it solves the optimization iteration time consuming that is required to determine the tapering line length used in the conventional impedance matching techniques. The predicted results of the return loss are validated by measurements of the fabricated prototype microstrip lens printed on an FR‐4 substrate that is designed to work in the industrial, scientific, and medical (ISM) band in order to form five beams in the directions −26°, −13°, 0°, 13°, and 26°.

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Section: Introductionmentioning

confidence: 99%