To conclude -1 ●●● ●●●● ●●●●● ●●●0 3.5 Noise Temperature and Noise Figure ●●●●0 ●●● No larger noise DUT N;=kToB- kB GkB G,Te,B small noise F=S./N=1+T=1+ S。/N。T Lossy Line: y=a+jB,L=e2l T.-(L-IyT F-1+(-D Cascaded Components =+会++ 十 GGG2GGG; F=F+ E-1F-1F4-1 十 GGG,GG,Gs 3.6 Noise Figure of Passive Networks N =kTB Ga-G. IS2Pa-r,P) T= 1-1 ① 11-Sr,P(1-Im) (S] (T) +1-G1T F=1 S2S2T G21 To 1-Sur 1
To conclude - 1 §3.5 Noise Temperature and Noise Figure §3.6 Noise Figure of Passive Networks larger noise small noise Lossy Line: Cascaded Components 1 0 0 0 i , , i i S S N N e DUT N kT B GT B i 0 e N N T kB GkB 00 0 / 1 1 / i i e added i SN T N F SN T N 2 , l j Le ( 1) T LT e 0 1 ( 1) T F L T 1 0 11 1 2 2 2 ,, , , i e e N kTB N N G FT G F T 23 4 1 1 12 123 2 4 3 1 1 12 123 1 1 1 ee e e e TT T T T G GG GGG F F F F F G GG GGG 2 2 21 21 a 2 2 11 | | (1 ) |1 | (1 | | ) s s out S G G S 21 21 0 1 1 G T F G T 21 1 ( 1) T T e G 12 21 22 11 1 s out s S S S S
To conclude 2 ●●● ●●●● ●●●●● ●●●0 For Wilkinson power divider:G T.=(-1T=(2L-1)T ●●●●0 21 (21 ●●●● ●●●● ● §3.7 Dynamic Range F-2L@To Nonlinear device %=(a+2a,)+(a%+4a6)cos@w1 or 43<0 network coscos3 10 P(referred to output) ldB IdB compression point 3 -10 Slope =I 6263646 -30 -20-10 0 1020 (dBm) EXAMPLE 3.5,page 92. 2
To conclude - 2 §3.7 Dynamic Range For Wilkinson power divider: EXAMPLE 3.5, page 92. 2 21 1 2 G L 21 1 ( 1) (2 1) T T LT e G 0 F 2 @L T 0 Nonlinear device v or vi network 2 0 0 20 0 2 3 1 3 20 0 30 0 0 30 1 ( ) ( )cos 2 1 1 cos 2 cos 2 4 3 3 4 v a aV t a aV t t V V a a V 3 a 0
To conclude 3 ●●● ●●●● ●●●●● ●●●0 S 3.7 Intermodulation Distortion ●●●●● ●●●● 7 ●●●色 p(ou) DRY *SWR p(ou) DR,=g阶 P 30 P 201-02 202-01 ldB 个 P= (a%2 0 02-01 0102 -30 For Cascaded Components: 60 2仙0” 11 B-G -90 Noise level -120-9060-30 030 P:(dBm) To continue Chapter 4 Antennas and Propagation for Wireless System 3
1 2 1 0 1 ( ) 2 P aV 1 2 3 2 2 30 1 3( ) 2 4 P aV V aa Ip 4 /3 1 3 To conclude - 3 §3.7 Intermodulation Distortion Chapter 4 Antennas and Propagation for Wireless System 2 1 1 2 2 1 2 2 1 2 0 For Cascaded Components: 1 3 ' " 23 3 1 1 P ( ) GP P 3 2 ( ) ( ) 3 1 3 0 0 * * out out l f P P DR DR N SNR N SNR To continue
●●● Microwave and RF Design of 888 Wireless Systems Chapter 4 Antennas and Propagation for Wireless System Dr.Xian Qi Lin 4
Microwave and RF Design of Wireless Systems Chapter 4 Antennas and Propagation for Wireless System Dr. Xian Qi Lin 4
球面 波前 龙伯透镜 平行 平行射线 ●● ●●● 喇叭 射线 ●●●● 铝射器 辐射器 ●●0 平面 月 ●●●0 平面●●● 波前 电场 波前●●● 方向 ●● 反射面 馈源 蔓形天线 引向天线 对数周期天线 切衡一留鸟在喻 房意迪份思连 间君相图悟欧隔 高的房脚绘脸伺 鞭形天线 nline.com.cn 年电丽网 美化天蛙 风页可
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●●● ●●●● ●●●● ●●●0 ●●●●0 ●●●0 ●●●● S 4.1 Antenna system parameters ●● 天线系统参数 §4.2 The Friis equation Friis方程 $4.3 Antenna noise temperature 天线噪声温度 §4.4 Propagation传播 4.5 Fading 衰落 6
§4.1 Antenna system parameters 天线系统参数 §4.2 The Friis equation Friis 方程 §4.3 Antenna noise temperature 天线噪声温度 §4.4 Propagation 传播 §4.5 Fading 衰落 6
●●● ●●●● ●●●●● ●●●0 S 4.1 Antenna system parameters ●●●●0 ●●●0 ●●●● ● Function of Antenna:converting a guided electromagnetic wave on a transmission line to a plane propagating in free space. 天线的功能：将传输线上的导行电磁波转化为自由空间传播的平面波 Parameter:radiation pattern(辐射方向图)，directivity(方向性)， gain(增益)，efficiency(效率)，polarization(极化) Spherical Plane wave wave Transmit Receive antenna antenna 7
§4.1 Antenna system parameters Function of Antenna: converting a guided electromagnetic wave on a transmission line to a plane propagating in free space. 天线的功能：将传输线上的导行电磁波转化为自由空间传播的平面波 Parameter: radiation pattern（辐射方向图）, directivity（方向性）, gain（增益）, efficiency（效率）, polarization（极化） Operation ： 7
●●● ●●●0 ●●●● ●0 1.Fields and Power Radiated by an Antenna ●●●● 天线的辐射场与功率 ●●0 ● ●2.Far-zone field distance远区场距离 ●3.Radiation Intensity辐射密度 ●4.Radiation Patterns辐射方向图 5.Directivity ●6.Radiation Efficiency辐射效率 ●7.Gain ●8.Aperture efficiency口径效率 ●9.Effective Area有效面积 ●l0.Antenna polarization天线极化 8
1.Fields and Power Radiated by an Antenna 天线的辐射场与功率 2. Far-zone field distance 远区场距离 3. Radiation Intensity 辐射密度 4. Radiation Patterns 辐射方向图 5. Directivity 6. Radiation Efficiency 辐射效率 7. Gain 8. Aperture efficiency 口径效率 9. Effective Area 有效面积 10. Antenna polarization 天线极化 8
●●● ●●●● 1.Fields and Power Radiated by an Antenna ●●●●● ●●●● ●●●●0 ●●●0 ●●● The radiated electric field of arbitrary antenna. 任意天线的辐射电场(at large distance,near-zone fields are negligible)在远距离，近区场可忽略时： .i where:0,are unit vectors,ko=2 Fo(0)F(0,)are Pattern functions 9
The radiated electric field of arbitrary antenna. 任意天线的辐射电场(at large distance, near-zone fields are negligible)在远距离，近区场可忽略时： 1.Fields and Power Radiated by an Antenna V m （ ） 0 ,, , , jk r e Er F F r where: are unit vectors, 0 2 k , F , F , are Pattern functions 9
●●● ●●●● ●●●●● ●●●0 Conclusion: ●●●●0 ●●●● ●●● ● ● DPhase variation:e-/kor 相位变化 amplitude variation:1/ 幅度变化 3transverse electromagnetic (TEM)waves: polarized in either0or中directions.在p和OL的极化 The associated magnetic field:H EaH。= -E6 70 170 7=120-3779 The wave impedance of free space. 自由空间波阻抗 10
Conclusion: 0 jk r e ① Phase variation: ②amplitude variation: 1 r ③transverse electromagnetic (TEM) waves: polarized in either or directions. 0 E H 0 E H The associated magnetic field: ＝ ＝ 120 377 The wave impedance of free space. 10 相位变化 幅度变化 在 和 上的极化 自由空间波阻抗
