Novel Miniature Dual-Band Rat-Race Coupler With Arbitrary Power Division Ratios Using Differential Bridged-T Coils
- 1 January 2021
- journal article
- research article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Microwave Theory and Techniques
- Vol. 69 (1), 590-602
- https://doi.org/10.1109/tmtt.2020.3035287
Abstract
In this article, a novel miniature dual-band rat-race coupler design is proposed. The proposed dual-band rat-race coupler employs differential bridged-T coils (DBTCs) as building blocks such that a very compact circuit size and a dual-band response can be achieved at the same time. Especially, through the proposed dual-band design of DBTC, arbitrary power division ratios over the two operating bands can also be realized. Explicit design equations of the proposed dual-band rat-race coupler are presented, and practical limitations on the achievable frequency ratio, power division ratio, and bandwidth are thoroughly investigated. As design examples, two 2.45-/5.5-GHz dual-band rat-race couplers with 0-/0- and 3-/0-dB power division ratios for the two bands are implemented in a silicon-based integrated passive device process. Very compact circuit sizes of less than 4.4 mm x 3.1 mm as well as good measured performance are achieved. To the best of our knowledge, these are the smallest dual-band rat-race couplers ever reported.Keywords
Funding Information
- Ministry of Science and Technology, Taiwan, R.O.C. (MOST 108-2221-E-008-012)
- National Center for High-performance Computing, Taiwan, R.O.C.
- Taiwan Semiconductor Research Institute, Taiwan, R.O.C.
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