插入馈电的微带贴片天线

这篇主要讲：为什么要使用插入式馈电，以及插入式馈电的特性，贴片天线的阻抗问题

 

 

i：贴片天线的自然输入阻抗取决于馈电在patch的位置，馈电点距离贴片的边界越近输入阻抗越大，越接近中心输入阻抗则越小

The natural input impedance of a patch antenna dependent on where within the patch
the feed is located. It is possible to match the patch antenna from below 30Ω to above
200Ω. If the feed is located closer to the edge of the patch the input impedance will be
high, if the feed is located closer to the center of the patch the impedance will be low.
Below is the standard input impedance of an inset fed patch antenna at 2.45GHz.

ii：另一部分部分是关于patch的性质

General Facts:
◦ Larger Patch = Lower Frequency
◦ Thicker Dielectric = More Bandwidth
◦ Center of patch = 0Ω
◦ Edge of patch >200Ω
◦ Pattern skewed by microstrip inset
◦ Patch radiates from two “slots” in ground plane

 

 

iii：patch设计要则

Design Guidelines:
◦ Patch Width
◦ Patch Length
◦ To Increase Frequency:
The patch antenna radiates from the side in which it is
fed and the opposite side.
◦ Decrease Patch Length
◦ Decrease dielectric constant
◦ Increase Bandwidth:
◦ Increase patch distance from ground
◦ To a lesser extent:
◦ Increase patch width
◦ Decrease dielectric constant
◦ Increase input impedance by reducing the feed inset
◦ Inset Spacing microstrip width

 

传送门： http://www.microwavetools.com/inset-fed-microstrip-patch-antenna/