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Tham khảo tài liệu 'electromagnetic waves propagation in complex matter part 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Electrodynamics of Multiconductor Transmission-line Theory with Antenna Mode 247 We can write the integrated change rate in a compact form. pantenna fl dpenn x dx 1 m iI l 2 1 Mc2 QI l 2 63 pt J0 dx dx 2W l 2Mc Q l 63 It is clear that the total change rate due to the antenna mode consists of the emission and absorption terms which are indicated by the minus sign term and the plus sign term. We would like to comment here which process as emission or absorption occurs. When a power supply is connected at the middle of one-conductor transmission-line this antenna operates for radiation-emission as a transmitter because the emission term is larger than the absorption term. When a passive lumped circuit element is connected at the middle of one-conductor transmission line this antenna operates for radiation-absorption as a receiver because the absorption term is larger than the emission term. 5. Three-conductor transmission-line system We consider now the three-conductor transmission-line theory with emission and absorption through the antenna mode. This is a very interesting case where the two-conductor transmission-lines include the effect of the circumstance. In our previous publication Toki Sato 2009 we have discussed the case where the total current is zero and hence the case without the antenna mode. The present situation with the antenna mode corresponds to the realistic case. In this case we introduce the normal common and antenna modes. They are written with the currents and potentials of the three lines. Here we consider that the lines 1 and 2 are the main lines and the line 3 denotes the circumstance. In 1 2 I1 I2 Ic 1 2 I1 I2 I3 Ia 1 2 I1 I2 I3 Vn V1 - V2 Vc 2 V1 V2 V3 Va 1 2 V1 V2 V3 64 We work out the coupled integro-differential equations for the TEM mode with the retardation term treated explicitly. There is a factor two difference between the antenna mode current and the total current It 2Ia. We write the results here for the normal common and .