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mrp
Antenna-Theory.com Newbie
Joined: 19 Nov 2018
Posts: 1
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 Posted: Mon Nov 19, 2018 4:19 am Post subject: What is down side of wide band antenna? |
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I want to make a broadband dipole to cover 440 - 470 mhz. If I use 3/4 in. diameter tube and feed it with 75 ohm coax, EZNEC software shows very low VSWR for entire range, and the gain is just a high as thin wire antenna.
What is the down side of a fat diameter antenna?
I thought a wide band antenna is a compromise. I don't see it, other than the extra expense in metal and increased wind resistance. |
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admin
Site Admin
Joined: 03 Jan 2007
Posts: 247
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| Posted: Mon Nov 19, 2018 7:01 am Post subject: |
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There is no performance downside
more volume = more bandwidth
If you have the volume, use it |
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hagster
Antenna Theory Regular
Joined: 09 May 2015
Posts: 34
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| Posted: Mon Nov 19, 2018 10:09 pm Post subject: |
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A narrowband antenna can act as a filter against strong out of band signals that could saturate the first amplification stage of your rx. A narrow band antenna may give you more options to select a cheaper/lower power better NF LNA.
Not that I am an expert in them(before my time), but I beleive that ealry crystal radios very much needed a narrow band antenna(narrow band impedence match) to tune to radio broadcasts. |
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