Coaxial RF dual-polarized waveguide filter and method

Abstract

Polarization-preserving microwave RF filters having multiple resonators that are each operable for different Q factors for setting overall bandwidth. A coaxial dual-polarized waveguide filter may include a cable having a hollow circular body with ends formed by copper plates that each includes at least one iris. The irises may control the energy transfer into and out of the cavity and therefore set the Q factor for the body. The shape of the internal diameter of the body and the irises may provide for reception and propagation of differently polarized signals. Multiple segments may be cascaded in series to effect higher order filtering. Also described are methods of transmitting signals using these filters.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This patent application claims priority as a continuation-in-part to U.S. patent application Ser. No. 13 / 843,205, titled “RADIO SYSTEM FOR LONG-RANGE HIGH-SPEED WIRELESS COMMUNICATION”, and filed on Mar. 15, 2013. The entire contents of this application are herein incorporated by reference in its entirety.[0002]This patent application also claims priority to U.S. Provisional Patent Application No. 61 / 760,387, titled “DUAL POLARIZED WAVEGUIDE FILTER”, and filed on Feb. 4, 2013; U.S. Provisional Patent Application No. 61 / 760,381, titled “FULL DUPLEX ANTENNA”, and filed on Feb. 4, 2013; U.S. Provisional Patent Application No. 61 / 762,814, titled “RADIO SYSTEM FOR LONG-RANGE HIGH-SPEED WIRELESS COMMUNICATION”, and filed on Feb. 8, 2013; U.S. Provisional Patent Application No. 61 / 891,877, titled “RADIO SYSTEM FOR LONG-RANGE HIGH-SPEED WIRELESS COMMUNICATION”, and filed on Oct. 16, 2013; and U.S. Provisional Patent Application No. 61 / 922,741, ti...

AI Technical Summary

Benefits of technology

This patent describes devices and systems for transmitting high-bandwidth signals between points. Specifically, it describes radio devices with dual high-gain reflector antennas. These antennas have a fixed parallel alignment between them, which ensures that they are always aligned to send or receive information. This alignment is important for maintaining the efficiency of the antennas. The patent also suggests various ways to improve the rigidity of the overall device or system to prevent alignment disruption. The technical benefit of this invention is that it allows for more reliable and efficient point-to-point transmission of high-bandwidth signals.

Problems solved by technology

However, there are limitations to the application of optical fibers.

Because laying optical fibers in the field can require a large initial investment, it is not cost effective to extend the reach of optical fibers to sparsely populated areas, such as rural regions or other remote, hard-to-reach areas.

Moreover, in many scenarios where a business may want to establish point-to-point links among multiple locations, it may not be economically feasible to lay new fibers.

However, currently available wireless technologies for long-range, point-to-point connections encounter many problems, such as limited range and poor signal quality.

Conventional radio devices, including radio devices having parabolic reflectors, suffer from a variety of problems, including difficulty in aligning with an appropriate receiver, monitoring and switching between transmitting and receiving functions, avoiding interference (including reflections and spillover from adjacent radios / antennas), and complying with regulatory requirements without negatively impacting function.

The resonators on conventional filters are limited because a higher Q factor and increased performance stability may only be achieved by increasing the internal volume of the filter cavities.

While generating attenuation poles at specific frequencies in the filter response is well known in standard multi-pole filters, the polarization-preserving characteristic is not always fully realized.

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