haydar said:I need to design branchline coupler for 63.87 MHz. Lambda/4 becomes 117.4 cm. by using dielectric substrate with epsilonr equals to 4.7, lambda/4 is 54.16 cm.
I fabricated a coupler with this value. however I get isolation equals to 0.3 and other S parameters are not as I expected.
Is there anybody who constructed a coupler before and knows how to design and what to do to obtain best results?
I have read some posts about coupler but my design is at low frequency and I want to learn design hints.
thanks.
PS:can you suggest some companies to buy coupler?
haydar said:this is the design. but gives error.
haydar said:ok, let's think I can use coax cables. how can I obtain Zo/sqrt(2)
impedance?
VSWR said:Here is the result using paralleled 75 ohm RG59 and 53 ohm RG58 cables. Just as an example. You have to replace them by cables with smaller outer diameter in order to fit on your board.
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