Abstract: Microwave projectile communication apparatus comprises a microwave probe fixed to a gun barrel at its muzzle end. A microwave oscillator, having a reference frequency selected for exciting the single fundamental electromagnetic mode in the barrel, is connected to the probe, for example, through a hybrid mixer configured for extracting, from moving projectile-reflected microwaves, a true Doppler signal for projectile velocity measurements. Connected between the oscillator and the probe is a signal modulator for modulating the reference oscillator signal to the probe. Connected to the signal modulator is a driver signal generator which controls the modulator in a manner enabling information, such as fuse delay time or target range, to be communicated to the projectile fuse. A conventional fire control computer may be used to provide to the modulator the data to be transmitted to the projectile.

Abstract: A top-loaded low profile antenna for data transponders includes an antenna pin mounted vertically, affording vertical polarization for the antenna, an aluminum plate mounted in a horizontal plane and connected to an upper end of the pin, providing top-loading of the antenna, the plate being supported by a lucite frame mounted on an upper surface of the data transponder and which also dielectrically loads the antenna feed region. The load plate and lucite frame enclose the antenna pin so that the antenna is less susceptible to vandalism, and the top-loading results in a reduction in the height of the antenna structure improving the aesthetics of the antenna and data transponder installation.

Abstract: Projectile velocity measurement and communication apparatus comprises a microwave probe fixed to a projectile barrel near a muzzle end. An oscillator, having a reference frequency selected for exciting a fundamental electromagnetic mode in the barrel, is connected to the probe through a hybrid mixer configured for extracting, from moving projectile-reflected microwaves, a true Doppler signal having a varying frequency related to projectile barrel velocity. A processor, connected for receiving the Doppler signal, measures, by a clock oscillator, Doppler signal periods (half periods). A data presorter in the processor selects a last "N" number of period measurements before the projectile reaches an interference position relative to the probe, to be fed to a fire control computer interface for determination therein of projectile barrel and muzzle velocities, calibration means being provided to update barrel diameter values used in such determination.

Abstract: Insular waveguide band reject ring resonator filter and band pass ring resonator filter built for use in the frequency range from about 1 GHz to about 1,000 GHz, which filters may be used either with a single pole or multiple poles.

Abstract: An insular waveguide directional coupler for use in the frequency range from about 1 GHz to about 1,000 GHz including a conductive image plane, a first length of elongated high permittivity dielectric waveguide of finite cross section adjacent to the conductive image plane, a second length of elongated high permittivity dielectric waveguide of finite cross section adjacent to the conductive image plane and spaced from the first length of waveguide to provide a coupling region therebetween, and a thin film of synthetic organic resin disposed between and secured to the conductive image plane and the lengths of waveguide, the thin film being low loss in character and having a low permittivity compared with that of the lengths of waveguide, the first length of waveguide having an inlet port at one end of the coupling region and spaced away from the second length of waveguide a distance substantially greater than the distance between the lengths of waveguide in the coupling region, the first and second lengths of

Abstract: A receiver module including a mode launcher, a band pass filter, a local oscillator and a balanced mixer for use in the frequency range 1 GHz to 1,000 GHz, wherein the components are all connected by an insular waveguide transmission line having a conductive image plane, a dielectric waveguide attached to the image plane by a thin film of plastic, the thin film being low loss in character and having a low permittivity compared with that of the dielectric waveguide, the ratio between the thickness of the thin film and the square root of the cross-sectional area of the dielectric waveguide being in the range from about 0.02 to about 1.0.

Abstract: A receiver module including a mode launcher, a band pass filter, a local oscillator and a balanced mixer for use in the frequency range 1 GHz to 1,000 GHz, wherein the components are all connected by an insular waveguide transmission line having a conductive image plane, a dielectric waveguide attached to the image plane by a thin film of plastic, the thin film being low loss in character and having a low permittivity compared with that of the dielectric waveguide, the ratio between the thickness of the thin film and the square root of the cross-sectional area of the dielectric waveguide being in the range from about 0.02 to about 1.0.

Abstract: A ferrite circulator for use in the frequency range 1 GHz to 1,000 GHz, wherein a ferrite cylinder is disposed in a junction of three equiangularly arranged high permittivity dielectric waveguides that are adjacent to a conductive image plane with a plastic film therebetween and a magnet establishing magnetic field in the ferrite cylinder normal to the image plane; also disclosed is a ferrite isolator for use in the frequency range from 1 GHz to 1,000 GHz including a ferrite slab disposed adjacent to one side of a high permittivity dielectric waveguide disposed adjacent to a conductive image plane with a plastic film therebetween, a resistance film disposed adjacent to a conductive image plane, a resistance film disposed adjacent to the ferrite slab, and a magnet for establishing a magnetic field in the waveguide and the ferrite slab disposed normal to the image plane; there further are disclosed switches, modulators, phase shifters and transceivers incorporating such ferrite circulators and isolators.

Abstract: A receiver module including a mode launcher, a band pass filter, a local oscillator and a balanced mixer for use in the frequency range 1 GHz to 1,000 GHz, wherein the components are all connected by an insular waveguide transmission line having a conductive image plane, a dielectric waveguide attached to the image plane by a thin film of plastic, the thin film being low loss in character and having a low permittivity compared with that of the dielectric waveguide, the ratio between the thickness of the thin film and the square root of the cross-sectional area of the dielectric waveguide being in the range from about 0.02 to about 1.0.