Dual-band antenna feed system and dual-band antenna

Abstract

The invention discloses a dual-band antenna feed system. The feed system includes a dual-band combiner and a dual-band feed source. The dual-band combiner includes a common waveguide, a balanced typeorthogonal mode coupler and a high band input round waveguide. The common waveguide is a round waveguide adaptive to low frequency band and one end of the common waveguide is connected with the high band input round waveguide through a conical transition waveguide. The balanced type orthogonal mode coupler is used for dividing low band signals in a horizontal polarization direction and a perpendicular polarization direction into two channels and feeds the signals into the common waveguide through two orthogonal ports arranged opposite to each other in pairs on the side wall of the common waveguide. The dual-band feed source includes a corrugated horn. A dielectric medium rod having two conical ends is arranged in the cavity of the common waveguide. One end of the dielectric medium rod is inserted into the high band input round waveguide in an interference fit manner while the other end extends outside the horn outwards along the axis of the corrugated horn. The invention also disclosesa double band antenna. By adopting the system provided by the invention, the antenna can be shared by an E band and a common low band, so that the communication capacity is increased and system costis reduced.

Description

technical field [0001] The invention relates to a dual-frequency antenna, in particular to a dual-frequency antenna feeding system. Background technique [0002] E-band (E frequency band) refers to a section of spectrum resources whose frequency band is 71--76GHz / 81--86GHz. Because of its wide frequency bandwidth, its spectrum resources are very rich, especially suitable for high-speed data transmission and communication Therefore, it is a popular research direction in the communication field at present, and the mature E-band communication system is gradually applied to the commercial field. To develop the E-band communication system, the antenna of this frequency band is a key component that must be developed. [0003] If a set of antennas for the E-band system is developed independently, it will inevitably lead to tighter resources of antenna towers, increase the difficulty of electromagnetic compatibility, and increase additional tower rental fees for communication opera...

AI Technical Summary

Problems solved by technology

[0005] For the dual-frequency antenna that can work in E-band, the design difficulty of its feed system lies in: 1. The E-band frequency is very high, which is 4 times or even 5 times higher than the commonly used point-to-point communication frequency, the difference is so It is very difficult to implement a combiner in two large frequency bands. With the commonly used duplexer scheme, the low-frequency low-pass filter for E-band frequency signals cannot be realized in the conventional way; 2. The diameter of the feed circular waveguide commonly used for point-to-point communication It is much larger than the maximum size of the waveguide that can suppress the E-band high-order mode. Therefore, when the E-band frequency band signal is transmitted in the ordinary circular waveguide, the complex high-order mode will inevitably be excited. The existence of the high-order mode will seriously reduce the antenna feed. At the same time, many resonance points will be formed in the E-band frequency band. At the resonance point, the signal cannot be transmitted at all, forming a transmission zero point. At this frequency point, it cannot work at all, and too many high-order modes will also reduce The performance of the antenna radiation pattern makes it unable to meet the standard of class-3; 3: The frequency of E-band is very high, which requires high design accuracy and processing accuracy. If the form of coaxial waveguide is used, the inner waveguide conductor Due to the small size and high processing precision, it is difficult to realize in practical engineering applications

Images