Designing microstrip transitions into parallel-plate regions using the FDTD method

Uyguroğlu, Rasime; Niazi, A.Y.

doi:10.1002/(sici)1098-2760(19990705)22:1<81::aid-mop21>3.0.co;2-d

Cited by 5 publications

(10 citation statements)

References 8 publications

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“…In this part, a line section transition to match the beam ports to the lens cavity instead of the taper line is explained in detail. Uyguroğlu and Niazi formed a method to match a high‐impedance microstrip line to the aperture of the parallel plate with a lower impedance . The suggested method is based on the calculation of the dimensions of the transition sections that are connected to the parallel plate region terminated by three absorbing boundary conditions in order to eliminate the edge reflections .…”

Section: Impedance Transformer Sectionsmentioning

confidence: 99%

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: Impedance Transformer Sectionsmentioning

confidence: 99%

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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“…Uyguroğlu and Niazi developed a method [2] for matching microstrip line into parallel plate region. They have calculated the capacitive reactance due to discontinuities and taken into account for the calculation of section lengths by using FDTD method.…”

Section: Mictostrip Rotman Lens Designmentioning

confidence: 99%

“…The microstrip line has a characteristic impedance Z 0 =50Ω and is to be matched to an aperture width which has an impedance Z A [2]. This is achieved by an additional section with impedance Z B with a certain length, as shown by Fig.…”

Section: Mictostrip Rotman Lens Designmentioning

confidence: 99%

“…A design was used to match a 50Ω transmission line to the parallel plate region of the lens, which has a very low resistance. Uyguroğlu and Niazi used a similar approach to design microstrip transitions into parallel plate regions by using FDTD [2]. In this study a complete Rotman lens strucure was designed and simulated at 2.45GHz center frequency.…”

Section: Introductionmentioning

confidence: 99%

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Microstrip Rotman lens fed array using multisection transition

Al-Obaidi

Uyguroğlu

2015

2015 23nd Signal Processing and Communications Applications Conference (SIU)

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Özetçe-Rotman Lens, çok girişli bir yapıya sahiptir. Giriş ve çıkış noktaları arasında, dalganın değişik yollar takip etmesinden kaynaklanan faz farkından ötürü, hüzmenin yönü kontrol edilebilir. Paralel metal levhalardan oluşan mikroşerit Rotman lensin performansı, levhalarla iletim hatlarının iyi uyumlaştırılmasına bağlıdır. Bu çalışmada, çok kesimli bir uyumlaştırma yöntemi önerilmiş ve mikroşerit Rotman lensin orta besleme iletim hattına uygulanmıştır. Geri dönüş kayıpları, miktoşerit ve Rotman lens arasındaki uyumlaştırmanın çok iyi olduğunu göstermektrdir. Anahtar Kelimeler-Rotman lens, mikroşerit geçiş, uyumlaştırma, faz farklı dizi anten, paralel metal bölge. Abstract-The Rotman lens is a multi-input device whichcontrols the beam scan angle, depending on the phase shift corresponding to the path length between the input source positions and the radiator elements. The matching between the transmission lines and the parallel plate region of the lens is one of the important factors of the performance of a Rotman lens built on a microstrip. A matching method is suggested and applied between the center feed line and the parallel plate region of the lens. The return loss show a very good matching between the feed line and the microstrip Rotman lens.

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“…This work focuses on the accurate estimation of the phase centers of commonly used linearly tapered and multistep transitions of Uyguroğlu and Niazi . Only a few reports have been traced on the phase center positions of the linearly tapered transitions but no reports has been traced on the phase centers of the multistep transitions.…”

Section: Introductionmentioning

confidence: 99%

An accurate determination of the phase center position of transitions into 2‐dimensional regions

Uyguroğlu

Embais

2018

Int J Numerical Modelling

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Correct estimation of the phase centers of the input and output ports is important in Rotman‐type bootlace lens applications. Any shift in the position of the phase center of a port used as a transition between the feed lines and the 2‐dimensional region will cause phase errors, which will create adverse effects on the radiation patterns. This paper introduces a method for determining the phase centers of the transitions radiating into parallel plate regions. A study has been conducted for linearly tapered and multistep transitions (ie, radiators). The results of the study show that the estimated phase centers are displaced from the aperture of the transitions. This displacement is smaller for the multistep transitions compared with the linearly tapered transitions. The simulation results of these transitions also show that, the use of the estimated phase center position reduces the phase errors significantly over wide coverage angles. The results also show that the phase errors do not change with the distance from the aperture. On the other hand, phase errors varies with frequency. These errors are smaller for the stepped transitions compared with the linearly tapered transitions. A separate simulation study of radiation patterns of a linear array fed by a Rotman lens has shown that deterioration occurs in sidelobes and minima levels and a small shift in the off‐axis beam positions when short transitions are used without phase center position correction.

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Designing microstrip transitions into parallel-plate regions using the FDTD method

Cited by 5 publications

References 8 publications

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

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

Microstrip Rotman lens fed array using multisection transition

An accurate determination of the phase center position of transitions into 2‐dimensional regions

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