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# Electromagnetics

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Study of electromagnetics is for electric and magnetic fields. To understand those fields, we need to know the concept of vector and differential operators.

Study of electromagnetics is for electric and magnetic fields. To understand those fields, we need to know the concept of vector and differential operators.

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### Transcript

• 1. Antenna Engineering CHO, Yong Heui Electromagnetics
• 2. 1. Maxwell’s equations Basic equations ( 기본방정식 )  <ul><li>: Gauss( 가우스 )’s law </li></ul><ul><li>: Faraday( 패러데이 )’s law </li></ul><ul><li>: Biot-Savart( 비오 - 사바르 )’s law </li></ul><ul><li>: Ampere( 앙뻬르 )’s law </li></ul>
• 3. 1. Maxwell’s equations Explanations
• 4. 2. Explanations Vector ( 벡터 )  <ul><li>Vector: magnitude + direction </li></ul><ul><ul><li>Coordinate ( 좌표계 ): </li></ul></ul><ul><li>Scalar: magnitude </li></ul><ul><ul><li>Real number ( 실수 ) </li></ul></ul>Temperature Velocity
• 5. Electric field ( 전기장 ) 2. Explanations  <ul><li>: electric field [V/m] </li></ul><ul><ul><li>Force: </li></ul></ul><ul><li>: electric flux ( 전속 ) density [C/m 2 ] </li></ul><ul><li>: electric potential [V] </li></ul><ul><ul><li>(static) , gradient ( 경사 ) </li></ul></ul><ul><ul><li>Energy: </li></ul></ul><ul><li>: permittivity ( 유전율 ) [F/m] </li></ul>Electricity
• 6. Magnetic field ( 자기장 )  <ul><li>: magnetic field intensity [A/m] </li></ul><ul><li>: magnetic flux ( 자속 ) density [Wb/m 2 ] </li></ul><ul><ul><li>Force: </li></ul></ul><ul><li>: vector potential [Wb/m] </li></ul><ul><ul><li>, curl ( 회전 ) </li></ul></ul><ul><ul><li>Energy </li></ul></ul><ul><li>: permeability ( 투자율 ) [H/m] </li></ul>Magnet 2. Explanations
• 7. Product ( 곱 )  <ul><li>Dot product, inner product </li></ul><ul><li>Cross product, outer product </li></ul>Right screw Projection 2. Explanations
• 8. Gradient ( 경사 , 구배 )  <ul><li>Nabla (del), </li></ul><ul><li>(static field) </li></ul><ul><li>Peak detector </li></ul>Map 2. Explanations
• 9. Divergence ( 발산 )  <ul><li>Source detector, hole detector </li></ul>2. Explanations Tap
• 10. Divergence ( 발산 ) Electric field Magnetic field 2. Explanations
• 11. Principle of divergence 2. Explanations
• 12. Curl ( 회전 )  <ul><li>Rotation detector </li></ul>2. Explanations
• 13. Principle of curl 2. Explanations
• 14. Boundary conditions ( 경계조건 )  <ul><li>: continuity of normal D </li></ul><ul><li>: continuity of tangential E </li></ul><ul><li>: continuity of normal B </li></ul><ul><li>: continuity of tangential H </li></ul>Sourceless system 2. Explanations 
• 15. Continuity of E fields  <ul><li>: continuity of normal D </li></ul><ul><li>: continuity of tangential E </li></ul>Gauss’ divergence theorem Stokes’ theorem 2. Explanations
• 16. Continuity of H fields  <ul><li>: continuity of normal B </li></ul><ul><li>: continuity of tangential H </li></ul>Biot-Savart’s law Ampere’s law 2. Explanations