A 1.4-2.3-GHz Tunable Diplexer Based on Reconfigurable Matching Networks

作者：Ko Chih Hsiang^*; Rebeiz Gabriel M

来源：IEEE Transactions on Microwave Theory and Techniques, 2015, 63(5): 1595-1602.

DOI：10.1109/TMTT.2015.2411605

• Combline filter
• reconfigurable matching network
• tunable filter
• tunable diplexer

An idea for implementing reconfigurable matching networks to realize a tunable diplexer is investigated and demonstrated. The reconfigurable matching networks ensure that the rejection band impedance of every filter is transformed to an open circuit over a wide range of frequencies, allowing two tunable filters to be connected together to form a tunable diplexer without affecting each other. The tunable diplexer is built using Schottky diodes and combline resonators on Duroid substrates, and can operate from 1.4 to 2.3 GHz with a closest frequency separation of 110 MHz. Measurements show virtually no difference in the frequency response between a standalone filter and a filter placed in the tunable diplexer. The work shows that a wideband tunable diplexer can therefore be realized using tunable bandpass filters and reconfigurable matching networks.

• 出版日期2015-5