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The existing designs of Butler matrices are all based on microstrip lines, which may cause performance degradation when the operation frequency increases. To solve this problem, this article presents the design and realization of Butler matrix based on patch element. In order to achieve wideband and simple structure features, the circuit utilizes couplers with arbitrary phase difference and a novel...
In this paper, a novel inkjet printing technology is presented, which allows the fabrication of fully printed tunable RF components. A tunable phase shifter is fabricated to demonstrate the capabilities of this simple, flexible and low-cost method. The proposed phase shifter contains tunable ferroelectric varactors in metal-insulator-metal (MIM) configuration, which is fully inkjet-printed on top...
This paper presents a novel method of inkjet printed Barium-Strontium-Titanate (BST) material for low-cost RF application. To demonstrate its capability in phased array antenna application, a compact continuously tunable load line phase shifter in the frequency range from 8 GHz to 10 GHz is realized. The BST thick-film is printed at the areas which interdigital capacitors are later patterned. A phase...
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