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ku_band_directional coupler

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lorna_li

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there is a ku_band directional couplers , the vswr is below -20,and the il<1.5dB,isolation>-24,but coupling is between -17dB~-11dB.I simulation in ads ,the coupling is -15dB~-16dB, could you tell me hou can i solution it??
 

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