Moreover, this maximum value of the velocity ratio will be reduced if the impedance ratio is decreased. In the circumstance that the impedance ratio is fixed, the transmission-zero position can be tuned to be at a lower frequency by increasing the velocity ratio. Furthermore, when thevelocity ratio is fixed, the lower the impedance ratio, the shorter the average electrical length for a transmission zero. In other words, the created transmission zero will move to a lower frequency.
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