PCB設計

単純なワイヤーアンテナには必要ありますか? 50 オーム伝送線路?

It depends.

  • If you’re talking about a “long wire” (more typically/accurately, a random wire antenna) used for receiving only, then the line impedance isn’t at all an issue. As long as it’s properly insulated at the right spots, you can run the wire right up to the receiver input and get excellent results. Using a 50 オーム線 (which would almost certainly be some type of coax) here would generally be mostly for convenience, because the receiver has an input connector best used with a coaxial cable (例えば, a BNC or SO-239).
  • If we’re talking about an antenna to be used for transmitting, けれど, the answer becomes more complicated. There are two primary concerns when connecting a transmitter to its antenna:
    1. Getting the most power transferred to the antenna and actually radiated.
    2. Protecting the transmitter’s output stages from the effects of high SWR.

Available choices of feedlines range from the typical coax cables at 50–75 ohms through “ladder lines” than can have characteristic impedances in the hundreds of ohms.

続きを読む: ケーブル & ワイヤーハーネスアセンブリ

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オリバー・スミス

オリバーは、PCB 設計に熟練した経験豊富なエレクトロニクス エンジニアです。, アナログ回路, 組み込みシステム, とプロトタイピング. 彼の深い知識は概略図のキャプチャに及びます, ファームウェアコーディング, シミュレーション, レイアウト, テスト, そしてトラブルシューティング. オリバーは、電気設計の才能と機械の適性を活かして、プロジェクトをコンセプトから量産まで進めることに優れています。.

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