Abstract
A band-selective power divider is demonstrated for the first time. By replacing lumped element right-handed (RH) and left-handed (LH) transmission lines (TL) in a conventional Wilkinson power divider, it is possible to achieve both power division and filtering simultaneously. By utilizing the positive phase propagation property of an RHTL, which works as a low-pass filter, and the negative phase propagation property of an LHTL, which works as a high-pass filter, the band-selective quarter-wave sections required to construct a Wilkinson power divider are implemented. The fabricated circuit shows an insertion loss in the range 1.7 dB–2.5 dB in the passband, with the circuit dimensions of merely 12 mm by 10 mm.
Highlights
Many radio-frequency and microwave systems require power dividing and combining processes
As there are many articles regarding the structures and analysis of right-handed transmission line (RHTL) and left-handed transmission lines (LHTLs), we briefly review the theories to explain the operation of a band-selective power divider
We presented a band-selective divider based on the RH, LHTL structure and demonstrated our idea through experimental results
Summary
Many radio-frequency and microwave systems require power dividing and combining processes. E author of reference [11] used a series connected band-pass filter and a low-pass filter to replace the quarter-wave section of the Wilkinson power divider, and the author of reference [12] suggested a power divider using a coupled microstrip line structure. Our main idea is to combine a synthetic RHTL and a synthetic LHTL to realize quarter-wave sections in a conventional Wilkinson power divider. With this method, it is possible to achieve effective power division and band-pass. International Journal of Antennas and Propagation filtering simultaneously As this circuit is made with lumped elements only, it is compact in size especially when the circuit is designed for low-frequency band. Due to this advantage, proposed circuit is a good candidate for many compact and portable microwave systems
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