The tuner of claim 4 wherein the conductive tip region is defined by first and second layers of conductive material formed on opposite sides of said flat vane structure.Ħ. The tuner of claim 1 wherein the dielectric probe structure comprises a flat vane structure fabricated of a low loss, low dielectric constant material.ĥ. The tuner of claim 1 wherein said probe comprises a dielectric probe structure having a conductive tip region, the conductive tip region for disposition into the waveguide through the slot, wherein the dielectric probe structure suppresses propagation of coaxial mode electromagnetic energy from the waveguide through the slot.Ĥ. The tuner of claim 1 wherein the tuner is adapted for an operating frequency band covering 75 GHz to 110 GHz.ģ.
Wherein the reduced height waveguide provides higher cut-off frequencies for higher order modes excited in the waveguide due to discontinuities, thereby widening a bandwidth of the tuner.Ģ. An RF waveguide tuner for impedance matching, comprising:Ī reduced height waveguide section comprising a conductive wall and having a slot formed in the wall along a waveguide tuning area, the reduced height waveguide section having a reduced height dimension and a width dimension Īn input waveguide section adjacent a first end of said reduced height waveguide section which transitions from an input waveguide height dimension which is larger than said reduced height dimension, the input waveguide section having a width dimension equal to the width dimension of the reduced height waveguide section Īn output waveguide section adjacent a second end of said reduced height waveguide section which transitions from said reduced waveguide height dimension to said an output waveguide height dimension which is larger than the reduced height waveguide dimension, and wherein the reduced height dimension is from about 5% to about 40% smaller than the input waveguide height dimension and the output waveguide height dimension, the output waveguide section having a width dimension equal to the width dimension of the reduced height waveguide section Ī probe extendable into the waveguide through the slot Īpparatus for selectively positioning the probe at positions at variable depths within the waveguide to vary the reflection coefficient and within a tuning range of movement along the slot to vary the phase of the reflections from the probe Product Data Manual, "Automated Tuner Systems", Maury Microwave Corporation, Ontario, California, Nov. Product Data Sheet "75-100 GHz Programmable Tuner" Focus Microwaves Jun. 1996) "Millimeter Wave Tuners" Focus Microwaves. Snowden, "A 75-110 Ghz Automated Tuner with Exceptional Range and Repeatability", IEEE Microwave and Guided Wave Letters, vol. "Reflections and Matching", Microwave Measurements, Second Edition, pp. Hunter, "Microwave Impedance Measurement", pp. 11, pp.478-496, New York and London: McGraw-Hill Book Company, Inc., 1947. "Technique of Microwave Measurements", M.I.T. Radiation Laboratories Series, vol.9, pp. "Microwave Transmission Circuits", M.I.T.
SLOTTED LIN ETUNER SERIES
A series of slots is formed in the waveguide housing perpendicular to the main slotted line, to form a multi-choke filter that prevents the propagation of parallel plate modes within the slot area thus further reducing leakage and excessive insertion loss. The non-conductive probe structure assures that the propagation of the coaxial guided wave modes, and especially the coaxial TEM mode, within the slot area are suppressed, thus eliminating a typical source of leakage. The position and depth of this gradual probe penetration creates a continuously variable tuning of the complex impedance, ranging from a very low reflection state up to high reflection states together with an unlimited capability of phase change in its reflection.
The tuner utilizes a non-conductive rectangular bar vane made out of low loss, low dielectric constant material as the probe, with special gold plated areas, that is inserted through the slot of the line into a reduced height waveguide. The electrical tuner is adapted to match the impedance of two waveguide media, or enhance or modify the characteristic impedance of a media relative to that of another one. A slotted line tuner, also capable of operation as a fully automated tuner, to provide arbitrary termination in high frequency waveguide media for use with frequencies of interest between GHz is disclosed.
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