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- W1971917526 abstract "A new 3 dB branch line coupler with a sharp roll-off slope characteristic is introduced. The bandpass characteristic with a good out-of-band rejection property reduces noise, intermodulation, and interference problems. The filter characteristics have been obtained with four asymmetrical λ/4 open circuited coupled lines above four DGSs (Defected Ground Structure) in microstrip configuration. Also the sharp selectivity has been obtained by using four λ/2 open circuited shunt stubs. Theoretical model for the circuit is derived based on a TEM approximation. The coupler has been simulated and fabricated. Measurement results show excellent roll-off slopes in lower transition band for |S 21 | and |S 31 | such as 60dB/700MHz and 40dB/550MHz, respectively, at around 3.5 GHz. And insertion losses for |S 21 | and |S 31 |, both better than 4.1 dB have been obtained. Power and phase imbalances are 0.4 dB and ± 60, respectively. Return loss and isolation characteristics are both better than 20 dB over 42% fractional bandwidth." @default.
- W1971917526 created "2016-06-24" @default.
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- W1971917526 date "2012-12-01" @default.
- W1971917526 modified "2023-09-26" @default.
- W1971917526 title "Branch line coupler with sharp roll-off slope and good out-of-band rejection" @default.
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- W1971917526 doi "https://doi.org/10.1109/apmc.2012.6421537" @default.
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