2016
DOI: 10.7567/jjap.56.011701
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High figure-of-merit compact phase shifters based on liquid crystal material for 1–10 GHz applications

Abstract: A liquid crystal (LC) based tunable microstrip line (ML) phase shifter featuring high performance is presented. The experimental results show an electrically tunable differential phase up to 360° at 10 GHz with an overall insertion loss <8.5 dB. The device possesses a high figure-of-merit (FoM) of 64°/dB at 9.8 GHz and 60°/dB between 7–10 GHz. This is achieved by simultaneously considering both of the LC tuned phase and overall loss in the design. The proposed device utilizes the inverted meander ML technol… Show more

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Cited by 37 publications
(24 citation statements)
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“…The main ML and bent stubs have equal widths 1 , which are carefully designed to ensure that the characteristic impedance of the whole device, including the impedance adaptors and SMA connectors, thoroughly matches for minimising the device reflection and insertion loss [17,18]. Alignment layer made of polyimide mixture nylon with 0.2% concentration was coated on the Rogers and ground surfaces that are in contact with the LC material.…”
Section: Design Of the Liquid Crystal Based Band-stop Filtermentioning
confidence: 99%
“…The main ML and bent stubs have equal widths 1 , which are carefully designed to ensure that the characteristic impedance of the whole device, including the impedance adaptors and SMA connectors, thoroughly matches for minimising the device reflection and insertion loss [17,18]. Alignment layer made of polyimide mixture nylon with 0.2% concentration was coated on the Rogers and ground surfaces that are in contact with the LC material.…”
Section: Design Of the Liquid Crystal Based Band-stop Filtermentioning
confidence: 99%
“…The ground plane is etched to insert the SMA contact and for ease of fabrication. Due to the liquid-like state of the LC, the SMA contact doesn't touch the LC layer directly, hence the impedance adaptors at both ends with width W 3 shown in Figure 1 are designed to eliminate the impedance mismatch caused by the change in substrate between the air and the LC material [19]. The best impedance match that could be obtained by simulation has a width of W 3 = 2.5mm, and W 1 = 0.245mm.…”
Section: Filter Structure and Design Proceduresmentioning
confidence: 99%
“…more stringent requirement regarding phase shifting range and resolution, insertion loss, operating bandwidth, linearity, signal-to-noise figure, power consumption, response time, robustness, size, large-scale integration, manufacturing tolerance, and cost, etc. We have explored the use of LC as low-loss tunable media for passive microwave analog components [11,12] and extended our phase shifter design into 60-90 GHz [3]. Different approaches of electrically-tunable device configurations combining with LC were studied for the millimeter-wavelength range, among which coplanar waveguide (CPW) was desirable as compared with other transmission lines [5,13,14] or waveguide structures [15][16][17][18] in terms of overall performance, ease of control, and circuit size.…”
Section: Introductionmentioning
confidence: 99%