Broadband antenna design method based on rotary feed source

Abstract

The invention relates to a broadband antenna design method based on a rotary feed source, which relates to the field of antennae and comprises the following steps of: dividing a working frequency band to enable octaves of two feed sources to be equivalent; selecting a reflecting surface with a proper aperture and a focal diameter ratio according to a gain requirement; the irradiation angle of each section of feed source is designed according to the selected focal diameter ratio; based on the distances between the phase centers of the two sections of feed sources and the respective mounting bottom surfaces, the distance between the rotation center and the bottom of the paraboloid on the center symmetry axis of the paraboloid is calculated, so that the phase center of each feed source can fall on the focus of the reflecting surface when the feed source is used; the antenna has the advantage that the problems of large low-frequency and high-frequency beam width difference and low high-frequency efficiency caused by one-section feed source coverage of a broadband antenna are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of antennas, and particularly to a broadband antenna design method based on a rotating feed source. Background Art

[0002] The front-feed parabolic antenna has a simple form and good performance control, and is often used as the preferred form of the antenna. With the increasing requirements for broadband antennas, problems such as large differences in beam widths between low-frequency and high-frequency bands and low high-frequency efficiency caused by the coverage of a single feed source under a large bandwidth will occur. Therefore, a segmented form needs to be adopted to achieve large-bandwidth coverage. However, segmentation will increase the overall number of antennas and the occupied space size.

[0003] Therefore, in view of the above deficiencies, a broadband antenna design method based on a rotating feed source needs to be provided. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] The technical problem to be solved by the present invention is to solve the problems of large differences in beam widths between low-frequency and high-frequency bands and low high-frequency efficiency under a large bandwidth.

[0006] (II) Technical Solutions

[0007] To solve the above technical problems, the present invention provides a broadband antenna design method based on a rotating feed source, including the following steps:

[0008] I. Divide the working frequency band so that the octave bandwidths of the two feed sources are equivalent;

[0009] II. Select a suitable aperture reflector and focal ratio according to the gain requirements;

[0010] III. Design the irradiation angle of each feed source according to the selected focal ratio;

[0011] IV. Based on the distances between the phase centers of the two feed sources and their respective mounting bottoms, calculate that the rotation center is at a distance L from the bottom of the parabolic surface on the central symmetry axis of the parabolic surface, so that the phase center of each feed source can fall on the focus of the reflector when in use; where

[0012]

[0013] F is the focal ratio;

[0014] D is the reflector aperture;

[0015] L1 and L2 are the distances between the phase centers of the two feed sources and their respective mounting bottoms.

[0016] As a further description of the present invention, preferably, the reflector aperture D satisfies:

[0017]

[0018] Among them,

[0019] λ is the wavelength;

[0020] G is the antenna gain.

[0021] (III) Beneficial effects

[0022] The above technical solutions of the present invention have the following advantages:

[0023] When designing a large bandwidth front-feed parabolic antenna, the present invention reduces the difference in beam widths at low and high frequencies and makes the beam change relatively uniformly by adopting a rotating feed form. At the same time, the feed is designed in sections to improve the high-frequency efficiency and maximize the aperture utilization rate. Description of the drawings

[0024] Figure 1 is the design logic block diagram of the present invention. Specific implementation manners

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] A broadband antenna design method based on a rotating feed, as Figure 1 shown, includes the following steps:

[0027] Ⅰ. Divide the operating frequency band so that the octave bandwidths of the two sections of the feed are equivalent; taking the operating frequency as f1 GHz to f2 GHz as an example, it is recommended to divide the frequency band according to Divide the frequency band.

[0028] Ⅱ. Select a suitable aperture reflector and focal ratio according to the gain requirement; among them, the reflector aperture D satisfies:

[0029]

[0030] Among them,

[0031] λ is the wavelength;

[0032] G is the antenna gain.

[0033] Ⅲ. Design each section of the feed and design the irradiation angle of each section of the feed based on the focal ratio of the selected reflector.

[0034] Ⅳ. Based on the distances L1 and L2 between the phase centers of the two-segment feeds and their respective mounting bottoms, the rotation center is calculated to be at a distance L from the bottom of the paraboloid on the central symmetry axis of the paraboloid, so that the phase center of each feed can fall on the focus of the reflector when in use; where

[0035]

[0036] F is the focal ratio;

[0037] D is the reflector aperture;

[0038] L1 and L2 are the distances between the phase centers of the two-segment feeds and their respective mounting bottoms.

[0039] In summary, the broadband antenna designed by the above method can reduce the difference in beam widths at low and high frequencies, make the beam change relatively uniformly, and at the same time, the feed is designed in segments, which can improve the high-frequency efficiency and maximize the aperture utilization rate.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A broadband antenna design method based on a rotating feed, characterized in that: It includes the following steps: Ⅰ. Divide the working frequency band so that the octave of the two feeds is equivalent; Ⅱ. Select an appropriate aperture reflector and focal diameter ratio according to the gain requirement; Ⅲ. Design the illumination angle of each feed according to the selected focal diameter ratio; Ⅳ. Based on the distances between the phase centers of the two feeds and their respective mounting bottoms, calculate that the rotation center is at a distance L from the bottom of the paraboloid on the central symmetry axis of the paraboloid, so that the phase center of each feed can fall on the focus of the reflector when in use; where F is the focal diameter ratio; D is the aperture of the reflector; L1 and L2 are the distances between the phase centers of the two feeds and their respective mounting bottoms respectively.

2. The broadband antenna design method based on a rotary feeder according to claim 1, characterized in that: The aperture D of the reflector satisfies: Wherein, λ is the wavelength; G is the antenna gain.

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