微带天线简介
微带天线简介
引言 √1953年G.A.Dcschamps:提出,但到70年代才得到 人们的注意。 √由介质、地板、馈电、贴片四部分构成。 √加工工艺有光刻和蚀刻等。 view showing coaxial feed feed at (xo,yo) Feed along the centerline is the most Note:L is the resonant dimension.The width W is usually common(minimizes chosen to be larger than L(to get higher bandwidth). higher-order modes However,usually W<2 L.W=1.5 L is typical. and cross-pol) L UESTC
UESTC 引言 1953年G.A. Dcschamps提出,但到70年代才得到 人们的注意。 由介质、地板、馈电、贴片四部分构成。 加工工艺有光刻和蚀刻等
优缺点 工作频率可从100M到100GHz 优点: √质量低; √低剖面; √易加工和批量生产; √易与微波电路集成; √易于实现双频或双极化; √易于组阵,馈电结构以及匹配网络易于设计; 缺点: ·带宽窄 效率低 功率容量小 UESTC
UESTC 优缺点 工作频率可从100M到100GHz 优点: 质量低; 低剖面; 易加工和批量生产; 易与微波电路集成; 易于实现双频或双极化; 易于组阵,馈电结构以及匹配网络易于设计; 缺点: • 带宽窄 • 效率低 • 功率容量小
分类 1、按形状分 Disk with Slot Semi Disk Disk Sector 明 &ao Elliptical Ring Semi Ring Ring Sector Square Disk Pentagon Hexagonal with Eccentric Inner Circle Circular Ring Rectangle Ellipse H-Shape U-Shape L-Shape Equilateral Triangle Ring Rectangular Rectangular with Right-Angled a Ring Inner Circle Isosceles Triangle Cross-Junction T-Shape Trapezoidal UESTC
UESTC 分类 1、按形状分
2、按应用分 √宽带微带天线 √小型化微带天线 √圆极化微带天线 √双频、多频微带天线 √双极化微带天线 √宽波束微带天线 UESTC
UESTC 2、按应用分 宽带微带天线 小型化微带天线 圆极化微带天线 双频、多频微带天线 双极化微带天线 宽波束微带天线
辐射机理 贴片镯射器 地板上向半空间辐射 锁线 的两个缝隙 一抱饭 Patch 基片 {o) ¥A2 Radiating Radiating slot #1 slot #2 e Substrate Ground plane 辐射缝隙 L→ t Er h W Ground plane (c) C
UESTC 辐射机理 地板上向半空间辐射 的两个缝隙
薄介质假设 On patch and ground plane,E=0=2E (x,y) Inside the patch cavity,because of the thin substrate,the electric field vector is approximately independent of z. Hence E≈2E.(x,y) E.(x.y) h UESTC
UESTC 薄介质假设
Magnetic field inside patch cavity: H=-1 V×E j04 =-1V×(E,(x,》 jou =-a-2xvE(》 Hence x,川=0(2xE(x) UESTC
UESTC
Hx)=jon(xVE.(》 Note:the magnetic field is purely horizontal. (The mode is TM..) E(x,y) h 。1 (x,y) UESTC
UESTC
磁壁假设 On edges of patch, y J·2=0 Hence, W 以,=0 x L Also,on lower surface of patch conductor we have J=(-2×H) n h UESTC
UESTC 磁壁假设