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Institutionernas kurser för doktorander

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Kursplan för

Läsår
SSY100 - Antenna engineering
 
Kursplanen fastställd 2012-02-21 av programansvarig (eller motsvarande)
Ägare: MPWPS
7,5 Poäng
Betygskala: TH - Fem, Fyra, Tre, Underkänt
Utbildningsnivå: Avancerad nivå
Huvudområde: Elektroteknik, Teknisk fysik
Institution: 32 - ELEKTROTEKNIK


Undervisningsspråk: Engelska
Sökbar för utbytesstudenter
Blockschema: B

Modul   Poängfördelning   Tentamensdatum
Lp1 Lp2 Lp3 Lp4 Sommarkurs Ej Lp
0107 Tentamen 7,5hp Betygskala: TH   7,5hp   30 Maj 2013 fm V,  30 Aug 2013 fm M

I program

MPWPS WIRELESS, PHOTONICS AND SPACE ENGINEERING, MSC PROGR, Årskurs 1 (obligatoriskt valbar)
MPCOM COMMUNICATION ENGINEERING, MSC PROGR, Årskurs 1 (obligatoriskt valbar)

Examinator:

Professor  Per-Simon Kildal


Ersätter

EEM055   Antenna engineering

Kursutvärdering:

http://document.chalmers.se/doc/805d5aef-0ff2-4967-9d57-607d76c85c1f


  Gå till kurshemsida

Behörighet:

För kurser inom Chalmers utbildningsprogram gäller samma behörighetskrav som till de(t) program kursen ingår i.

Kursspecifika förkunskaper

The students need to have a basic theoretical knowledge of:
●electric circuit theory
●complex non-differential vector analysis
●theory of electromagnetic fields and waves

Syfte

This Antenna Engineering course gives an introduction to antenna theory and design for applications in both
a) traditional radar and communication systems based on Line-Of-Sight (LOS)
b) mobile communications systems with strong signal variations (fading) due to multipath propagation.
The course has a strong focus on system characterization for both these two applications, and treats the fundamental field theoretical part with compact engineering formulas that are easily interpretable and still well rooted in Maxwell's equations. These are applied to obtain classical formulas for the most common antenna types and thereby their basic principles of operation can be explained. Furthermore, the course contains lecture on materials for antenna design and fundamental limitations of antennas.

Lärandemål (efter fullgjord kurs ska studenten kunna)

The overall aim of the course is to provide an understanding of antennas for use in both traditional line-of-sight (LOS) systems and in modern wireless communication systems with multipath and Rayleigh fading, ranging from initial design with simple classical design formulas to numerical design and characterization with measurements. With this understanding you should be able to: a. Describe how antennas for line-of-sight (LOS) systems work and are characterized. Examples of LOS systems are radio telescopes, radar, radio links (point-to-point and point-to-multipoint communications) and satellite communication systems. b. Describe how antennas in multipath environment with fading behave and are characterized, such as antennas for mobile terminals, i.e. mobile phones, including also the characterization of the whole mobile terminal and user interaction. c. Describe the most common materials used in numerical antenna analysis as well as in practical antenna design. d. Explain the different factors contributing to the efficiency and gain of different types of antennas e. Explain the physical limitations of antennas; such as miniaturization and bandwidth limits of small antennas, maximum gain limits of large antennas including supergain, and correlation and efficiency limits of multiport/multibeam array antennas. f. Explain how different antennas can be analyzed in terms of classical incremental elementary sources, by using a modern and compact non-differential vector notation and numerical integration. The incremental elementary sources are the electric current, the equivalent magnetic current and the directive Huygen's source. g. Apply your knowledge about antenna analysis to design antennas using classical formulas and design curves for the most traditional antenna types; such as dipoles, slots, horns, reflectors and phased arrays. Good initial designs with classical formulas are important for a successful numerical design with a professional antenna CAD tool. h. Apply your knowledge about characterization of antennas for LOS and fading environment to measure antennas, both in classical anechoic chambers and in modern reverberation chambers, respectively. The reverberation chamber is a multipath emulator, in which also active mobile terminals such as mobile phones will be measured.

Innehåll

1. Introduction: Course information. Examples of antenna and antenna types. Applications and brief history. Some existing and future antenna systems and their frequencies and antenna types. About antenna terminology. Repetition of dB and basic vector formulas (cross and scalar products). 2. Characterization of antennas for line-of-sight (LOS) systems: Plane waves. Linear and circular polarization. The radiation field function: Phase reference point, polarization, phase center, directivity, sidelobes, E- and H-planes. Rotationally symmetric antennas: BOR0 and BOR1 antennas (BOR = Bodies of Revolution). System characteristics: gain, efficiency, total radiated power, equivalent noise temperature and G/T. Equivalent circuits on transmit and receive. Antenna impedance and matching. Transmission between two antennas in free space. Antenna measurements. 3. Characterization of antennas for multipath environments: Multipath environment and Rayleigh fading. Single antennas: Mean effective gain, radiation efficiency. Multiport antenna systems: Embedded element patterns, embedded element radiation efficiency, mutual coupling and correlation. Antenna diversity: Apparent, actual and effective diversity gain. Maximum Shannon capacity of MIMO systems (Multiple Input Multiple Output). Characterization of active terminals: Total radiated power, receiver sensitivity and bit error rate (BER), realized diversity gain, and user interaction (head loss and specific absorption rate). Measurements in reverberation chamber. Transmission between two antennas in multipath 4. Materials for antenna design: Theoretical materials and surfaces used in analysis: Perfect electric conductor (PEC), perfect magnetic conductor (PMC), PEC/PMC strip grids (soft and hard surfaces). Practical materials: Good conductors, poor conductors, dielectrics, foam. Artificial materials / periodic surfaces: Corrugations, strip-loaded surfaces, frequency selective surfaces (FSS), electromagnetic bandgap (EBG) surfaces 5. Incremental elementary sources of radiation: The incremental electric current (Hertz dipole). The incremental equivalent magnetic current. The directive incremental Huygen s source 6. Small antennas: Electric monopole and dipole. Yagi antennas. Log-periodic and other ultra wideband antennas. Electric loop antenna. Helical and spiral antennas. Slot antennas. Microstrip patch antennas. Inverted F-antennas or quarterwave patch antennas. Examples of practical small antennas for mobile terminals. Miniaturization of antennas and its fundamental bandwidth limitations 7. Aperture antennas: Aperture theory: aperture distribution, directivity, sidelobes. Tolerances and fundamental gain limitations of large antennas (including supergain). Horn antennas: Pyramidal horns, conical horns, corrugated horns. Reflector antennas: Paraboloidal antennas, Cassegrain antennas, feeds, phase center, aperture illumination taper, diffraction, blockage, subefficiencies, sidelobes. Examples of antennas used in radio telescopes 8. Array antennas: Linear and planar phased arrays. Isolated and embedded element patterns. Array factor as element-by-element sum. Array factor as grating-lobe sum (aperture approach). Directivity, sidelobes and grating lobes. Mutual coupling, active antenna impedance and scan blindness. Fundamental efficiency and correlation limitations of multiport/multibeam arrays.

Organisation

Lectures and tutorials: Each double hour lecture is followed by a double hour tutorial class, in which the course assistants will teach how to use the lectured principles, formulas and design curves to analyze and design antennas.


3 Laboratory exercises: a) Measurements of radiation patterns of some antennas including planar phased array in anechoic chamber. b) Measurements of radiated power and bit error rate of mobile phone in free space and talk positions in reverberation chamber. Measurements of Rayleigh distribution and diversity gain in reverberation chamber. c) Design of microstrip antenna, realize it by metal tape and grounded substrate, and measurements of it.


Assignments: Four voluntary home assignments will be given. They give extra points at the exam, if solved and handed in.

Litteratur

The new extended edition of Prof Kildal’s textbook “Foundations of Antennas – A Unified Approach for Line-Of-Sight and Multipath” will be available for the course in 2011. The extension are new chapters about characterization of antennas in multipath and about fundamental limitations on antennas. The most theoretical parts in the present chapters 3-9 of the book are not compulsory. The notation in the book is compact, easily interpretable and well suited for this introductory course with emphasis on design and system performance of antennas.


The course material will also give references to alternative descriptions in other textbooks.

Examination

The written exam consists of two parts. During the first part the textbook is not allowed to be used, whereas during the second part the students are allowed to use the book including its graphs and tables. The exam consists of four problems that include several sub-problems. The limits of the 3, 4 and 5 grades are set to 40%, 60% and 80%, respectively, relative to a 100% reference value that is somewhere between 100 points, which is the maximum possible score on an exam, and number of points obtained by the best examinee. If the acquired scores of an examinee is closely below a grade limit, his answers will be re-evaluated and the grade limit may be lowered, but only if the distance to the scores of the next person on the list is large.


Sidansvarig Publicerad: må 13 jul 2020.