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I know the short antenna is capacitive .
My question is
The short dipole and λ/2 dipole can has the same resonance frequency .
How can it do that ? (the same resonance frequency for short dipole and λ/2 dipole)
The physical structure is needed for resonance .
Why is the length for short...
Dear friends
The best length for resonance on dipole is λ/2 ,
but short dipole could be used λ/10 .
We know that performance for dipole in λ/2 is better .
In reality , we often need short dipole for mechanical design .
The short dipole and λ/2 dipole can has the same resonance frequency...
The high frequency spectrum get wide bandwidth .
On the view of wave propagation
The path loss of EM wave is large in high frequency .
So .. Why do the satellite still use high frequency ? (even in long distance)
welcome to any comments .
**broken link removed**
This link is't work .
I have some idea , but I don't know if it's right .
For example :
antenna operation for 2.4GHz band
1. Input 2.4GHz signal for an antenna
2. DC signal input for an antenna , and it gets 2.4GHz resonance frequency for operation
What's...
input power of antenna
May I ask a stupid question ?
An input power for antenna is DC or AC ?
Why is using this type of input ?
Thanks for any comments.
thanks for your reply .
The R meets my discription 1. , but
what is the relation between it and return loss ?
I think the return loss and R are different.
Dear all
characteristic for antennas
1. The quality factor (Q) is nagtive proportional to bandwidth (BW) .
The high loss leads to low quality factor , and it gets wide bandwidth.
2. But it views on return loss , the lower return loss can also get wide bandwidth.
What is the relation...
circular patch antenna using ansoft designer
HFSS is an another usual tool to design and simulate antennas .
but it's slower than IE3D
here fourm has its' handbook manual.
Re: Height of Antenna
I agree with vfone .
The length for small antennas is usually λ/4 or λ/2 due to the resonance structure.
But the antenna height is usually close to the ground because of the coupling.
Re: antenna design software
if you want run the antenna in high frequencies ,
the Ansoft HFSS is good for you.
It don't need to write codes , and easy to learn.
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