Millimeter-Wave Lange Coupler Design and Its Application in the Monolithic Image Rejection Mixer Design |
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Authors: | Zi Qiang Yang Tao Yang and Yu You |
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Institution: | (1) Microwave Center, University of Electronic Science and Technology of China, 610054 Chengdu, People's Republic of China |
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Abstract: | This paper reports on the design of a Ka-band monolithic Lange coupler and its application in the monolithic fourth-harmonic
image rejection mixer. Detailed design and analysis using Ansoft-HFSS simulator have been carried out. The simulated results
of the Lange Coupler show the insert loss is better than −3.64 dB; the amplitude balance is less than 0.55 dB and the phase
balance is less than 0.65° from the 90° phase difference over the 30 to 40 GHz frequency range. The Lange Coupler is employed
in a monolithic image rejection mixer that is fabricated by a commercial 0.18-μm pseudomorphic high electron-mobility transistor
(pHEMT) process. The chip size is 1.4 mm × 1.9 mm. The image rejection ratio (IMR) is from 15 to 34 dB in the RF frequency
range of 30 to 40 GHz. |
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Keywords: | image rejection mixer Lange Coupler monolithic microwave integrated circuit (MMIC) |
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