A waveguide-type left-handed transmission line is proposed. The transmission line is composed of a rectangular waveguide in the cuttoff frequency and periodic stubs filled with dielectric. The transmission line with short stubs filled with dielectric is expressed by series capacitance and parallel inductance. The operation of the left-handed transmission line is described using the equivalent circuit. Replacing the short stubs with open stubs, the transmission line can be used for a leaky-wave transmission line. The dispersion characteristic of the left-handed mode is shifted with respect to frequency by changing the stub length. As the result the band gap between the regions of the left-handed mode and the right-handed mode can be removed. The impedance of two modes gets close each other, so that it is excited in the wide frequency range. The beam scan from the backward direction to the forward direction can be obtained.%導波管型左手系線路が提案されている.線路は遮断領域矩形導波管と周期的に並べられた誘電体充填スタブで構成される.誘電体充填ショートスタブを持つ導波管は直列のキャパシタンスと並列のインダクタンスにより表現され，左手系線路の動作原理がその等価回路を用いて説明される.ショートスタブをオープンスタブに置き換えると，線路は漏洩波線路として使用することが出来る.左手系モードの分散特性はスタブの長さを変えることで周波数軸上を移動し，その結果左手系モードと右手系モードの間の遮断領域を取り除くことが出来る.また，2つのモードのインピーダンスは近づき広帯域な範囲で波が励振され，バックワード方向からフォワード方向のビームスキヤンが得られる.
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