Characteristic Analysis of Wide-Band Balun Transformer Having Delay Line Element For Phase Compensation

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  • 位相補償用遅延素子を接続した広帯域平衡•不平衡変成器の特性解析
  • 位相補償用遅延素子を接続した広帯域平衡・不平衡変成器の特性解析
  • イソウ ホショウヨウ チエン ソシ オ セツゾクシタ コウタイイキ ヘイコウ

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Abstract

In recent years, with the development of television and portable telephone, the wide-band transformer tends to be miniaturized. In this paper, the wide-band transformer is analized with the distributed coupled-line theory. As a main result of the analysis, the balance and unbalance transmission characteristics of the balun are remarkably improved in high-frequency range using delay line element for compensation. If the connected point Sw between coil winding and delay line is off the ground, the balance transmission band is increased about twice in low-frequency range. If the point Sw is grounded and if the impedance ratio m2 is the less, the higher degree of unbalance attenuation can be obtained. The better balance transmission characteristic can be get, When the matching factor K→1/2 (optimum).<br>In addition, we describe that the inphase or anti-phase transformer can be made on the basis of our isolation wide-band transformer. The equivalent circuits of inphase and anti-phase wide-band n:1 transformers are obtained with our theoretical analysis and these can be made of the same transformer. The transmission characteristics of inphase and anti-phase wide-band thansformers are analized and the improved characteristics are obtained in the high-frequency range. The theoretical and experemantal values agree well over the wide frequency range 100KHz-1000MHz.

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