Comparison of hollow waveguide and dielectric fibre based SPDT switches for W-band

Jost, Matthias; Reese, Roland; Pauls, J.; Gautam, Jay S. K.; Gemble, R.; Weickhmann, C.; Karabey, Onur Hamza; Jakoby, Rolf

doi:10.1109/gemic.2016.7461576

Cited by 4 publications

(7 citation statements)

References 7 publications

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“…Due to this maximum difference in permittivity, the field is confined better and the evanescent fields are nearly facing no dielectric loss. Compared to [9,11], the fibre has a cross-section of 1.8 mm × 1.8 mm. The fundamental E 11 y mode is a hybrid, rotationally symmetrical mode (see Fig.…”

Section: Dielectric Waveguide Componentsmentioning

confidence: 99%

“…In [9], the first comparison between two static, non-tuneable SPDTs, one in the hollow waveguide and one in dielectric fibre technology has already been presented by our group. For this, wellknown components of the hollow waveguide technology were adapted to the dielectric fibre technology, such as the Y-shaped power divider and the coupled line combiner.…”

Section: Introductionmentioning

confidence: 99%

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Fully dielectric interference‐based SPDT with liquid crystal phase shifters

Jost

Reese

Nickel

et al. 2018

IET Microwaves, Antennas & Propagation

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This study presents the first continuously tuneable, interference‐based W‐band single‐pole double‐throw (SPDT), fully implemented in subwavelength (sWL) dielectric fibre topology. Key components are the phase shifters in the two branches of the SPDT, which are realised as line sections filled with liquid crystal. They allow not only to adjust the signal ratios at the two output ports but also to tune the operating frequency between 93 and 110 GHz with isolation >25 dB. The first proof‐of‐concept SPDT demonstrator is realised and characterised at W‐band. However, concept and technology are scalable to higher frequencies. The complete SPDT with the WR10‐to‐sWL fibre transitions exhibits an insertion loss (IL) at the thru‐port between 5 and 7 dB in the frequency range from 85 to 110 GHz, where back‐to‐back measurements of the transitions itself already indicate an IL of up to 1.6 dB. The measurements at the isolated port of the SPDT exhibit transmission coefficients of less than −25 dB between 93 and 110 GHz with a minimum of −40 dB.

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Section: Dielectric Waveguide Componentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fully dielectric interference‐based SPDT with liquid crystal phase shifters

Jost

Reese

Nickel

et al. 2018

IET Microwaves, Antennas & Propagation

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“…Theoretically, it is clearly observed that infinite isolation S 21 can be achieved if Z S = 1 and θ = π/2. From (8) and (12), an ideal infinite attenuation (notch) was produced if the electrical length of the transmission line stub was a quarter wave (λ/4). This attenuation characteristic was used to produce multiband high isolation in SPDT switch.…”

Section: Switchable Transmission Line Stub Resonatorsmentioning

confidence: 99%

“…amplifiers, filters, switches and antennas) are highly desired, and they were developed to support several RF front-end systems [5][6][7]. Meanwhile, SPDT switch (which is a part of RF switches) is ordinarily used in RF front-end system to switch between up-link (transmitter mode) and downlink (receiver mode) [8][9][10][11] or, in general, to switch between two different signal paths [12]. From the literature, SPDT switches could be designed and used in applications such as time division duplex (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…In SPDT switch design, high isolation plays an important role in preventing unwanted leakage signal [26]. Furthermore, to increase the switch's isolation, researchers have reported different techniques such as series PIN diode with compensation parasitic capacitance [27], a lumped λ/4 transformer [8], hollow waveguide [12], resistive bias network [10], and other techniques reported in [28]. However, for the solution of discrete circuit design using standard discrete PIN diode packages, there are trade-offs in these high isolation techniques such as increasing the overall circuit size, a higher number of PIN diodes and a limited choice of lumped component values.…”

Section: Introductionmentioning

confidence: 99%

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Selectable multiband isolation of single pole double throw switch using transmission line stub resonator for WiMAX and LTE applications

Zakaria

Shairi

2017

IET Microwaves, Antennas & Propagation

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A selectable multiband isolation of single pole double throw (SPDT) switch with switchable transmission line stub resonators for applications of WiMAX and LTE in 2.3 and 3.5 GHz bands is presented. Two SPDT switches are presented. (Design 2) either allows selecting only one band while unselecting the other or selecting both of them. However, (Design 1) does not allow so. The transmission line stub resonator used in this design is an open stub resonator with quarter wave of the electrical length. By using a simple mathematical model, the theory of the transmission line stub resonator was discussed where it can be cascaded and resonated at centre frequencies of 2.3 and 3.5 GHz. Moreover, the cascaded transmission line stub resonators can be reconfigured between all‐pass and band‐stop responses using discrete PIN diodes. The key advantage of the proposed SPDT with switchable transmission line stub resonators is a multiband high isolation with a minimum number of PIN diodes. Therefore, the simulated and measured results showed the followings: <3 dB of insertion loss, >10 dB of return loss and >30 dB of multiband isolation in 2.3 and 3.5 GHz bands.

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