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[temmy7764]

Hello all, please i need urgent help to the following 3 questions:

Question1
I designed 6 single band antennas: 2 PIFA antennas for LTE 3 and LTE 20. Likewise for 2 Monopole antennas for LTE 3 and 20, and the last are 2 monopole for LTE 3 and 20.

From my simulation reults, I had high fractional bandwdith in deigned for LTE 3 antennas while low fractional bandwidth for LTE 20 antennas. Based on the fundamental limitation of electrically small antennas, I thought the antennas for lower frequency (LTE band 20) should be higher than the antennas designed for higher frequency (LTE band 3). The result is depicted on the table below:

Antenna LTE Return Realiz radiation total fractional
types bands loss gain efficiency efficiency bandwidth

ILA 3 -12.72 3.64 99.63 94.25 20.42
Monopole

Folded 20 -10.51 0.99 98.20 73.93 12.90
Monopole

PIFA I 3 -10.01 3.88 99.00 89.13 11.81

PIFA II 20 -29.20 2.26 98.62 98.44 11.01

Folded 3 -14.15 3.76 99.67 95.83 14.58
Loop

Meander 20 -32.62 -32.62 2.26 99.15 98.95 12.65
Loop

Question 2
Please how do I evaluate the differences between different antenna types in results: e.g., what causes the difference between two monopoles or two loops

Question 3
Please how do I analyse the current distributions for different antenna types: especially, how antenna for LTE20 exploits the ground plane in comparison with LTE3 antenna! Why?




















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[temmy7764]

Can anyone tell me how to post picture

[temmy7764]

http://d.yimg.com/hd/answers/i/c51df1bb562e49bfa985c6bdcfc11665_A.jpeg?a=answers&mr=0&x=1383920383&s=afaef4d761795dbac1dff03cea4903fb


This is the link to the table[/url]