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Phase shifter vs simple delay5/26/2023 ![]() ![]() ![]() The phase shifter of claim 2, further comprising: (a) a first ground section along a first of two longitudinal sides of the first central trace, the first ground section being coupled to the second terminal of each switch of a first subset of the first plurality of switches (b) a second ground section along a first of the two longitudinal sides of the second central trace, the second ground section being coupled to the second terminal of each switch of a first subset of the second plurality of switches (c) a third ground section along a second of the two longitudinal sides of the first central trace, the third ground section being coupled to the second terminal of each switch of a second subset of the first plurality of switches and (d) a fourth ground section along a second of the two longitudinal sides of the second central trace, the fourth ground section being coupled to the second terminal of each switch of a second subset of the second plurality of switches.ĥ. The phase shifter of claim 2, further comprising: (a) a first ground section along a first of two longitudinal sides of the first central trace, the first ground section being coupled to the second terminal of each switch of the first plurality of switches and (b) a second ground section along a first of the two longitudinal sides of the second central trace, the second ground section being coupled to the second terminal of each switch of the second plurality of switches.Ĥ. The phase shifter of claim 1, wherein for each switch among the first plurality of switches, there is a corresponding switch among the second plurality of switches, the distance between each switch of the first plurality of switches and the proximal end of the first central trace being the same as the distance between the corresponding switch of the second plurality of switches and the proximal end of the second central trace.ģ. A phase shifter comprising: (a) a radio frequency coupler having an input port, direct port, coupled port and isolation port (b) a first central trace coupled between the direct port and ground (c) a second central trace coupled between the coupled port and ground (d) a first plurality of switches each switch having a first terminal, a second terminal and a control terminal, the first terminal of each of the first plurality of switches coupled at intervals to the first central trace and the second terminal of each switch of the first plurality of switches coupled to ground and (e) a second plurality of switches each switch having a first terminal, a second terminal and a control terminal, the first terminal of each of the second plurality of switches coupled at intervals to the second central trace and the second terminal of each switch of the second plurality of switches coupled to ground.Ģ. To the best of the authors' knowledge, this is the first reported MEMS 3-bit phase shifter in the literature that has used a minimum number of switching elements per phase state.1. Reliability of the phase shifter is extensively characterized with different incident RF powers at room temperature (25☌) and discussed in detail. SP8T switches are capable of handling 0.1–1 W of power up to 100 million cycles which is sufficient power handling capability for wireless communication systems. The total area of the fabricated 3-bit phase shifter is 5.95 mm 2. Measured average phase error is less than 0.98° at 35 GHz. ![]() Finally, the phase shifter provides average return loss of better than 14 dB and average insertion loss of 4.4 dB over the 34.75–35.25 GHz. Later, two SP8T switches are connected back to back to develop the 3-bit phase shifter using different delay lines at 35 GHz. The SP8T switch results in isolation levels of 31–15 dB, return loss of 33–18 dB and insertion loss of 0.6–1.9 dB, respectively, at 26–40 GHz. The symmetric and compact SP8T switch is the primary building block of the 3-bit phase shifter. Single switch dimensions are 0.14 × 0.23 mm 2 which is much smaller than Si-on-insulator switches. Devices are fabricated on 635 µm alumina substrate utilizing on the coplanar waveguide (CPW) transmission line. This paper presents a radio frequency micro-electromechanical system (RF MEMS) based 3-bit phase shifter using MEMS single-pole-eight-throw (SP8T) switches. ![]()
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