Three-Dimensional Equivalent Focused Feed for an Offset Paraboloidal Reflector Antenna

Yazgan, Erdem; Turgut-Sansal, Goksen

doi:10.1080/02726340490513329

Cited by 4 publications

(6 citation statements)

References 14 publications

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“…Also in recent years, some new techniques have been developed in the analysis of off-focus fed and array feeding in single and dual reflectors for preventing aperture blockage of feeds, struts and subreflectors. These techniques are called as equivalent feed [49,50] and equivalent parabola techniques [51]. By using the combination of these two techniques, it is possible to minimize side and back lobes [52,53] (Figure 27).…”

Section: Reflector Antennasmentioning

confidence: 99%

Antennas for Space Applications: A Review

Akan¹,

Yazgan²

2020

Advanced Radio Frequency Antennas for Modern Communication and Medical Systems

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It is well known that antennas are inevitable for wireless communication systems. After the launch of Sputnik-1 which was the first artificial satellite developed by USSR (Union of Soviet Socialist Republics), telecommunication technologies started to develop for space excessively. However, significance of the antennas as first or final RF-front end element has not been altered for the space communication systems. In this chapter, after introducing telecommunication and antenna technologies for space, which space environmental conditions are to be faced by these antennas are summarized. Then, frequency allocation that is a crucial design factor for antennas is explained and tabulated. And finally at the last part, different types of antennas used in different space missions are presented with their functional parameters and tasks.

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Section: Reflector Antennasmentioning

confidence: 99%

Antennas for Space Applications: A Review

Akan¹,

Yazgan²

2020

Advanced Radio Frequency Antennas for Modern Communication and Medical Systems

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“…However, thinner antennas are flexible. The antenna dimensions are designed to operate on the patient's body by using electromagnetic software [50]. The double-layer antenna is shown in Figure 1.…”

Section: Double-layer Printed Wearable Dipole Antennasmentioning

confidence: 99%

“…The compact, printed, loaded dipole antenna is horizontally polarized. The antenna dimensions have been designed to operate on the patient's body by employing electromagnetic software [50]. The antenna consists of two layers.…”

Section: Printed Wearable Dual-polarized Dipole Antennasmentioning

confidence: 99%

Advanced Radio Frequency Antennas for Modern Communication and Medical Systems

Sabban¹

2020

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Dr. Albert Sabban holds a Ph.D. in Electrical Engineering from the Faculty of Electrical and Computer Engineering, University of Colorado at Boulder, USA (1991), and an MBA from the Faculty of Management, Haifa University, Israel (2005). He is currently a Senior Lecturer and researcher at the Department of Electrical and Electronic Engineering at Kinneret and Ort Braude Engineering Colleges. From 2007 to 2010, Albert Sabban was an RF and Antenna specialist at biomedical hi-tech companies where he designed wearable compact systems and antennas for medical systems. In 1976 he joined RAFAEL in Israel where he worked as a senior researcher, group leader, and project leader in the electromagnetic department until 2007. From 2008 to 2010 he worked as a RF Specialist and project leader at hi-tech biomedical companies. He has published over 100 research papers and holds a patent in the antenna area. He wrote four books on wearable compact systems and antennas for communication and medical systems. He wrote a book on electromagnetics and microwave theory for graduate students, and a book on wide band microwave technologies for communication and medical applications. He also wrote two chapters in books on microstrips and wearable printed antennas for medical applications.

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“…Cassegrain ve Gregorian tipi ikili antenler için literatürde bulunan eşdeğer paraboloid anten yöntemi [9] ve iki boyutlu kaymış besleyici için yansıtıcı yüzeyi üzerinde oluşan yüzey akım yoğunluklarını veren odakta eşdeğer besleyici formulasyonunu [10], gerekli koordinat dönüşümleri kullanılarak [11], odaktan üç boyutlu (3-B) kaymış besleyici için geliştirilmiş bulunan odakta eşdeğer besleyici yöntemi [12] ile birleştirilerek FO yöntemi uygulanmıştır [13,14]. Eşdeğer paraboloid anten yönteminin kullanılabilmesi de bazı koşulların gerçekleşmesine bağlıdır.…”

Section: Bu çAlışmada Asimetrik Ve Odak Dışından Besleyiciliunclassified

“…Analiz ve formülasyon üç bölümde gerçekleştirilecektir. Bu üç bölümden ilki asimetrik Cassegrain ve Gregorian ikili antenler için eşdeğer parabolik antenin elde edilmesi [9], ikincisi literatürde odak dışı iki boyutlu biçimde kaymış besleyicili paraboloid anten için bulunan eşdeğer odaktan beslenmiş parabolik anten için bulunan formülasyonun [10], gerekli koordinat dönüşüm yöntemlerinin [11] kullanılarak, 3-B olarak odak dışına kaymış besleyici için eşdeğer besleyicinin elde edilmesi [12] ve son olarak eşdeğer yüzey akımlarının bulunarak FO yönteminin uygulanmasıdır. Bu yöntemle ikili yansıtıcı analiz problemi, aynı kaynak ile beslenen tekli yansıtıcı problemine dönüşür [13,14].…”

Section: Formülasyon (Formulation)unclassified

Odak dışı beslemeli asimetrik ikili reflektör anten sistemlerinde eşdeğer paraboloid anten ve eşdeğer besleyici yöntemlerinin uygulanması

Turgut¹,

Yazgan²

2019

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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Analysis of 3-D offfocus fed and asymmetric dual antenna systems  Equivalent paraboloid antenna and equivalent feed techniques  Radiation pattern calculations for asymmetric Cassegrain and Gregorian antenna systems Off-focus fed reflector antennas are preferred to prevent loss due to aperture blockage effect of secondary reflector and feed in the reflector antenna system. For this reason, it is important to calculate the radiation pattern in the direction of the main beam, especially for single and double reflector antennas with feeder antennas or antenna arrays shifted from the focal point. In this study, a new formulation is given for the acceleration of the calculation by applying the Physical Optics method is modeled by using and equivalent paraboloid reflector antenna and equivalent feed techniques in 3-D off-focus fed and asymmetric structures of dual antenna systems used in satellite-earth stations. Figure A. Application of Equivalent feed and Equivalent Paraboloid Techniques for 3-D off-focus fed and Asymmetric Cassegrain and Gregorian Antennas Purpose: Aimed to increase the speed of calculation by combining two different techniques which helps to obtain the radiation patterns of off-focus fed and asymmetric Cassegrain and Gregorian reflectors. Theory and Methods: It is possible to find an equivalent model for the radiation patterns of a Cassegrain or Gregorian antenna fed by an array, using equivalent feeding and equivalent paraboloid antenna methods. Results: Optimization methods and genetic algorithms for estimating the parameters required for the feed and reflector parts in calculations can be easily applied for different structures Conclusion: In the study given in detail above, two methods are combined to provide an easy and fast solution for the calculation of the radiation pattern in the complex physical structures for Cassegrain and Gregorian reflector antenna systems. This method saves time for calculating the radiation pattern in the main beam direction and for making the necessary optimizations, especially in using the PO integral.

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Three-Dimensional Equivalent Focused Feed for an Offset Paraboloidal Reflector Antenna

Cited by 4 publications

References 14 publications

Antennas for Space Applications: A Review

Antennas for Space Applications: A Review

Advanced Radio Frequency Antennas for Modern Communication and Medical Systems

Odak dışı beslemeli asimetrik ikili reflektör anten sistemlerinde eşdeğer paraboloid anten ve eşdeğer besleyici yöntemlerinin uygulanması

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