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Design of multisection LC‐ladder divider at VHF‐band

Microwave power dividers play important roles in microwave circuit systems. As an in‐phase divider, the Wilkinson power divider which consists of two quarter‐wavelength transmission lines and an isolation resistor connected between two output ports is well known. However, the circuit size becomes large because this divider is designed based on a distributed circuit theory. This problem is extremely serious at low frequency regions such as VHF/UHF bands. Although some lumped‐element power dividers utilizing Π‐ or T‐networks have been reported in order to overcome this problem, these dividers have relatively narrow bandwidths about 16%. On the other hand, authors have been also proposed broadband lumped‐element power dividers utilizing LC‐ladder circuits. This article describes a design method of a multisection LC‐ladder divider at VHF band. The multisection LC‐ladder divider is a broadband lumped‐element power divider composed of multisection LC‐ladder circuits and an isolation resistor. By designing the divider based on multisection impedance transformer and L‐type matching techniques, broadband characteristics of a relative bandwidth of over 100% can be obtained at VHF band. Electromagnetic simulation and experiment for the designed divider have been performed in order to verify the design procedure. The measured results of the fabricated LC‐ladder divider at a center frequency of 178 MHz utilizing commercial chip elements are good agreement with simulation results. It is analytically and experimentally clarified that broadband characteristics can be realized with lumped‐element power dividers using multisection LC‐ladder circuits.