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apaptive antenna array is widely reasearched by all country,but it mainly concerned on mobile communication,why the can not be used in the HF freauency? i can not find any product about adaptive shortwave antenna array! why?
how to express a helix using math equation?I find a paper "An efficient curved-wire integral equation solution technique" which can be used to solve the current distributing for helix antenna,but i need know the helix curve equation.anybody can help me? anybody know how to use MOM to solve...
i want to design a helix antenna which work at 6MHZ. I want to know what decide the frequency in all parameter of the helix.turn spacing?length?
how to get the size?please help me!
i need to design a wideband 90 degree phase splitter for 2~30Mhz,anybody can give some advice for it? i can not find any information for quadrature phase splitter from book and internet.please help me!thanks!
constant-k filter
can you list the transfer function for me?
i only can get two equation:
v1=i1*jwL1+(i1-i2)/(jwC1)
v1-v2=(i1+i2)jwL1
please tell me how to get the transfer function.
and the constant K filter can be use in AC? i want to design it for HF communication.
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