V-band directional tandem coupler of monolithic uniplanar structure |
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Institution: | Millimeter-wave Innovation Technology Research Center (MINT), Department of Electronics Engineering, Dongguk University, 3Ga 26 Phil-dong, Choong-gu, Seoul, South Korea |
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Abstract: | We present a uniplanar coplanar-waveguide 3-dB tandem coupler operating at V-band frequencies. The uniplanar structure is monolithically fabricated by using two-section parallel-coupled lines and air-bridge crossovers replacing the conventional multilayer or bonded structures. Due to an optimized tandem structure and non-bonded crossovers minimizing the parasitic components, a maximum coupling of 2.5 dB is measured at 62 GHz with a 2 dB bandwidth of 83%, while a high directivity factor of 33 dB is simultaneously obtained at 58–62 GHz. Over the entire design frequency range of 30–90 GHz, we achieve good phase unbalance of 90 ± 6.0°, as well as return loss and isolation lower than ?23 and ?16 dB, respectively. |
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