USA As Represented by Secretary of the Navy

Sentel Corporation

James H Schukantz, Jr

Peder M Hansen

Daniel W Tam

John W Rockway

Michael A Maiuzzo

Shing Ted Li

Robert S Abramo

James C Logan

David Earl Hurdsman

Robert D Prince

A multi-band antenna comprising a conductive structure and a plurality of current probes coupled around the conductive structure. Each current probe is designed to receive and transmit in a substantially different frequency band than the other current probes. The current probes are positioned on the conductive structure so as to effectively create a plurality of transmit/receive antennas such that each respective antenna has a voltage standing wave ratio (VSWR) of less than or equal to approximately 3:1 for a given range within each respective frequency band.

Multiband current probe fed antenna

A comb limiter combiner for frequency-hopped communications includes an input signal coupler for coupling to a receiving antenna and distributing the antenna signal to a bank of input bandpass filters. The input bandpass filters have contiguous passbands that comprise the total receiver bandwidth. Each input bandpass filter is connected to a limiter having a threshold substantially equal to the limiting threshold of the receiver. Each limiter is connected to an output bandpass filter similar to the corresponding input bandpass filter to remove out-of-band intermodulation products generated by the limiter. The bank of output bandpass filters is connected to an output signal coupler for coupling to the front end of the receiver.

Comb limiter combiner for frequency-hopped communications

The present invention is a Comb linear amplifier combiner (CLAC) apparatus that allows one or more transmitters to transmit through one transmit antenna. The CLAC apparatus passes low powered transmit signals through a bank of bandpass filters. The transmit signals then pass through Class A amplifiers which amplify the transmit signals to the full transmit power. The full transmit power signals then pass through a second bank of bandpass filters. The transmission signals are then transmitted through a single transmission antenna.

Comb linear amplifier combiner (CLAC)

In an umbrella top-loaded monopole (UTLM) antenna, the charge distribution n top-load radials increases approximately linearly from the top of the antenna because the activated top-load wires are separating from the tower and each other at the same time they are getting closer to ground. The UTLM antenna of the invention incorporates a top-load configuration in which top-load elements, whether they be radiating or receiving, are arranged in sections of rhombic-shaped frames that originate at the top of the antenna and that extend away from the antenna towards the antenna's base where, at those points of the configuration furthest from the antenna tower and closest to ground at least two top-load elements converge to shield each other and hence reduce charge density. The top-load sections are disposed between the vertical guy wire planes of an antenna to ease their installation, repair and maintenance. The self-shielding effect of the invention permits an antenna to operate at considerably higher voltage. This top-load configuration can also show superior effective height and static capacitance as compared to the traditional UTLM antenna. Because of the efficiency offered by the invention, intrinsic bandwidth and radiated power can be superior to the typical UTLM antenna even with the same top-load voltage limit. Such results can be achieved with half of the traditional number of top-load high voltage insulators.

Split rosette-shaped monopole antenna top-load for increased antenna

A compact transmitting and receiving antenna has dual feeds permitting magnetic and electric dipole radiation. The antenna includes a loop antenna disposed within a loop shield and a mast. The loop shield is insulated from ground and a feed is provided to it and the mast to excite these as an electric monopole. The shield becomes part of the monopole antenna and provides the benefits of top-loading. An isolation transformer permits the simultaneous transmission of monopole and dipole radiation. The transformer converts an unbalanced coaxial feed line to the balanced loop antenna and isolates the monopole feed voltage from the loop antenna feed. To eliminate the affect of the monopole feed on the loop feed, and vice versa, the components on the high side of the monopole feed (the loop shield and mast) are driven in common mode (voltage) by the monopole feed, and will not couple the loop antenna feed through the transformer windings. Thus, with respect to the monopole feed voltage, both sides of the transformer windings connected to a loop antenna will be at the same voltage. No voltage drop across the transformer windings due to the monopole feed voltage will occur and hence no coupling to the loop feed transmitter will take place. The voltage insulation requirements are concentrated at the monopole feed point so that the isolation feed transformer takes all the voltage, making the loop, loop shield and monopole driven in common mode.

Dual-feed, dual-mode antenna for mono-directional pattern

In a cable for conveying information signals of selected frequencies and simultaneously conveying a selected amount of electric power, a central conducting means is surrounded by a dielectric material. An outer conducting means is positioned around the dielectric, and cooperates with the central conducting means to provide a first path, through which the information signals are conveyed, and one of the conducting means provides a second path, through which the electric power is conveyed.

Growing community of inventors

San Diego, CA, United States of America

James H Schukantz, Jr