30 dB microstrip coupler with high directivity
Due to the inhomogeneous structure of microstrip directional couplers, i.e. partly dielectric substrate, partly air, they mostly present property of poor directivity and low coupling level. The high directivity is achieved by a capacitive compensation by gap coupling of open stub formed in a sub-coupled line. Nevertheless, these couplers have the advantage of easy fabrication, lightweight, and incorporation with other microwave devices and are validated via design using Sonnet software. The main goal was to obtain coupling around -30 dB, meaning that almost all power is passed to the output, with a wide band; from around 3.5GHz to nearly 9GHz. Desired values have been obtained, including isolation and input match reaching -70 dB.
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Copyright (c) 2020 Azra Yildiz
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