Silicon-on-insulator Slot-waveguide Design Trade-offs
Waveguide-slot Array Antenna Designs For Low-average-sidelobe Specifications

2320MHz (13cm) Slotted waveguide Ant.

Omnidirectional Sector Waveguide SLOT Antenna
L and C Band (1296 & 2320 MHz)

The slotted waveguide has achieved most of its success when used in an omnidirectional role. It is the simplest way to get a real 10dB gain over 360 degrees of beamwidth.
The Slotted waveguide antenna is a Horizontally Polarized type antenna and light in weight.
3 Tuning screws are placed for tweaking the SWR and can be used to adjust the center frequency of your choice.
Each Slot antenna is supplied incl measurement plot from our RF network analyzer following your center frequency assignment.
2 Model avaiable:

1296MHz Slot antenna 23cm (1296MHz) Slot antenna

Circuit model of slotted waveguide antenna. The last slot is a distance d from the end (which is short-circuited, as seen in Figure 2), and the slot elements are spaced a distance L from each other. Before we discuss choosing the sizes, they will be given in terms of the guide-wavelength, which is the wavelength within the waveguide.
If the waveguide slot antenna is designed in this manner, then all of the slots can be viewed as being in parallel. Hence, the input admittance and input impedance for an N element slotted array can be quickly calculated: The input impedance of the waveguide is a function of the slot impedance.

Abstract—In this paper, the design of slots array antennas based on Substrate Integrated waveguide (SIW) has been analyzed and simulated. A waveguide slot antenna has a vertical row of slots along the length of a vertical waveguide, with the array of slots increasing the gain by flattening the vertical beam. Silicon-on-insulator slot-waveguide design trade-offs Abstract: Silicon-on-insulator slot-waveguide structures are designed and analysed numerically. We present our theoretical investigation of field confinement factors and effective nonlinear areas for different waveguide structures in order to find optimized geometrical dimensions.

2320MHz Slot antenna 13cm (2320MHz) Slot Antenna

Modes of Slot Waveguides

Silicon-on-insulator Slot-waveguide Design Trade-offs

Simulation of silicon cross-slot waveguide with FIMMWAVE software

Waveguide-slot Array Antenna Designs For Low-average-sidelobe Specifications

FIMMWAVE's mode solvers were used to calculate the modes of a silicon cross-slot waveguide; slot waveguides use a combination of high-index and low-index layers to generate light confinement.

FIMMWAVE can be used to model any slot waveguide geometry built from any materials, including silicon, polymer and hybrid slot waveguides. The silicon cross-slot waveguide presented here is taken from an article from Helsinki University of Technology [1], featuring FIMMWAVE simulations. The paper also presents results for waveguide geometries with angled sidewalls.

See also [2], also featuring FIMMWAVE simulations for the modelling of slot waveguides.

Silicon slot waveguide designed in FIMMWAVE

The modes of the silicon slot waveguide were calculated using FIMMWAVE's fully vectorial FDM Solver. The calculation only took a few seconds, and the solver was able to take advantage of the waveguide symmetry.

This waveguide is a single-mode waveguide, and the fundamental TE-like mode and TM-like mode are shown below. You can see clearly how the cross-slot geometry generates a 90-degree rotation of the field distribution between the two polarisations. FIMMWAVE can also provide a large number of mode properties, including effective index, propagation constant, group index, dispersion, polarisation, effective mode area, confinement factor etc.

Properties of the fundamental TE-like mode of the silicon cross-slot waveguide:
(clockwise from top-left) intensity profile, Ex field profile and horizontal section, mode properties

Properties of the fundamental TM-like mode of the silicon cross-slot waveguide:
(clockwise from top-left) intensity profile, Ey field profile and horizontal section, mode properties

FIMMWAVE allows you to check the accuracy of your calculation as it features three independent fully-vectorial Cartesian mode solvers: the FMM, FDM and FEM Solvers. We ran the simulation with all three solvers and found the results to be in excellent agreement.

FIMMPROP, the propagation tool associated with FIMMWAVE, can also be used to model light propagating within slot-waveguide structures.

References

[1] A. Khanna, A. Säynätjoki, A. Tervonen and S. Honkanen, 'Control of optical mode properties in cross-slot waveguides', Applied Optics 48, 34, pp. 6547-6552 (2009)

[2] M.P. Hiscocks, C. Su, B. Gibson, A.D. Greentree, L.C.L. Hollenberg, and F. Ladouceur, 'Slot-waveguide cavities for optical quantum information applications', Optics Express 17, 9, p7295-7303 (2009)

More publications

Click here to find publications that include FIMMWAVE simulations of slot waveguides on Google Scholar.

Slot Waveguide Design