An S / X dual-frequency dual-tracking feed network

Abstract

The present invention discloses an S / X dual-frequency dual-tracking feed network, belonging to the field of ring-focus dual-reflector antennas. The present invention includes an S / X dual-frequency feed and an S-band self-tracking feed network and an X-band self-tracking feed network connected to the S / X dual-frequency feed. The rightmost end of the S / X dual-frequency feed is an S-band signal open radiation cavity section. A circular choke groove centered on the open radiation cavity section is provided on the right surface of the S / X dual-frequency feed. The X-band self-tracking feed network is a TE21 mode coupler of a small-hole coupling type; the S-band self-tracking feed network includes a differential signal polarization synthesis network, eight cables and eight coaxial probes; one end of the coaxial probe is inserted into the circular choke groove; the other end is connected to the differential signal polarization synthesis network through a cable. The present invention can achieve the TE21 mode tracking function in the S / X bands, and also has the advantages of compact structure, easy processing, excellent electrical performance, etc., and can meet the requirements of the ring-focus dual-reflector antenna system.

Description

Technical Field

[0001] The present invention relates to the field of ring-focus dual-reflector antennas, and particularly to an S / X dual-band dual-tracking feed network. Background Art

[0002] In satellite communication, in order to maximize the utilization of communication capacity, satellites already have multi-band communication services. Multi-frequency shared antennas can enable an antenna-feeder system to operate simultaneously in two or more satellite communication frequency bands, achieving multi-purpose use of a single station and greatly reducing the construction cost of earth stations. Multi-band transceiver shared aperture antennas are a current research hotspot, and the key lies in developing a feed system that determines the electrical characteristics of the aperture antenna. The feed system is the core of the reflector antenna, and the performance of the feed largely determines the overall function and performance of the reflector antenna. The commonly used multi-band feed network systems mainly include the following three types:

[0003] 1) Coaxial-aperture horn feed network system

[0004] The coaxial-aperture horn feed network system consists of a multi-frequency feed and a backend network. Among them, the multi-frequency feed usually adopts the structure of a corrugated horn or a smooth-wall horn. This technology is relatively mature and can better solve the problem of multi-frequency reuse of the feed. However, signals of all frequency bands propagate in the common aperture of the horn, the modes in the horn are relatively complex, the antenna efficiency is limited, and the design difficulty of the backend network of the feed is relatively large.

[0005] 2) Multi-horn feed network system

[0006] This system is composed of multiple horns arranged in an array, mainly a five-horn feed network. Compared with the coaxial-aperture horn feed network system, this system eliminates the multi-frequency demultiplexing structure at the backend. However, when the high-low frequency interval is small, the spacing between the outer horn arrays is relatively large, and the efficiency of the feed irradiating the reflector is relatively low, affecting the overall performance of the antenna.

[0007] 3) Coaxial feed network system

[0008] This system consists of a coaxial feed and a backend feeding network, and can be divided into a metal nested coaxial feed and a dielectric rod loaded coaxial feed. Signals of different frequency bands propagate in relatively independent channels, and the isolation between frequency bands is relatively good. When the high-low frequency interval is large, the performance of both high and low frequency bands can be well balanced, and the overall performance of the feed is excellent. However, when the high-low frequency interval is small, the coaxial feed also has problems such as strong coupling between frequency bands and poor impedance matching characteristics of the low-frequency channel.

[0009] Satellite communication antennas usually have narrow beams with high gain. If the antenna pointing deviates from the satellite, its gain will decrease significantly, leading to a decline in communication quality. This requires that the maximum direction of the antenna gain always points to the satellite. The ways for the antenna to achieve satellite tracking are mainly divided into three types: manual tracking, program tracking, and monopulse tracking. Manual tracking and program tracking can no longer meet the increasingly high usage requirements. Monopulse tracking has high tracking accuracy and real-time performance. In the field of monopulse tracking antennas, TE21 mode tracking is often used. Traditionally, a TE21 mode tracker in the form of small-hole coupling is used to implement it, but this method is generally used for single-band tracking. Summary of the Invention

[0010] In view of this, the present invention proposes an S / X dual-frequency dual-tracking feed network, which is applied to a ring-focus dual-reflector antenna, has high efficiency, solves the deficiencies of co-nozzle feeds, multi-horn feeds, and coaxial feeds, can meet the signal reception and transmission working in the S band and the X band, and has the TE21 mode tracking function for the S band and the X band; the present invention also has the characteristics of compact structure, small volume, light weight, convenient operation, and low processing cost, and has a wide range of applications.

[0011] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0012] An S / X dual-frequency dual-tracking feed network includes an S / X dual-frequency feed 1, an S-band self-tracking feed network 3 connected to the S / X dual-frequency feed 1, and an X-band self-tracking feed network. The rightmost end of the S / X dual-frequency feed 1 is an S-band signal open radiation cavity section 9. A circular choke groove 10 centered on the open radiation cavity section 9 is provided on the right surface of the S / X dual-frequency feed 1. The X-band self-tracking feed network is a TE21 mode coupler 2 in the form of small-hole coupling; the S-band self-tracking feed network 3 includes a differential signal polarization synthesis network 301, eight cables 302, and eight coaxial probes 303.

[0013] Among them, the differential signal polarization synthesis network 301 includes eight input ports and two output ports. The differential signal polarization synthesis network 301 is sleeved on the outer surface of the S / X dual-frequency feed 1. The eight coaxial probes 303 are distributed at 45° along the outer surface of the circular choke groove 10 of the S / X dual-frequency feed. One end of the coaxial probe 303 is inserted into the circular choke groove 10; the other end is connected to the differential signal polarization synthesis network 301 through the cable 302. The two output ports of the differential signal polarization synthesis network 301 respectively output the left-handed and right-handed tracking signals of the S-band signal.

[0014] Further, the coaxial probe 303 includes a flange and connectors located on both sides of the flange. The connector connected to the cable is an N-50K connector. The connector inserted into the inner part of the circular choke groove 10 includes a metal rod connected to the N-50K connector and a metal mushroom head connected to the end of the metal rod. The metal rod and the metal mushroom head are connected by threads.

[0015] Further, the S / X dual-band feed 1 includes a feed body 5; a waveguide cavity penetrating from left to right is provided in the feed body 5, and four waveguide slots 7 distributed at 90° are provided on the circumference of the waveguide cavity; a shaped dielectric rod 6 is provided on the central axis in the waveguide cavity; the shaped dielectric rod 6 includes a conical section 601, a cylindrical section 602, and a curve-shaped section 603 from left to right; the waveguide cavity includes a tapered cavity section 11, a circular cavity section 12, a shaped cavity section 8, and an open radiation cavity section 9 from left to right; the waveguide slots 7 are provided on the circumference of the shaped cavity section 8;

[0016] Among them, the specific shaped shape of the curve-shaped section 603 is fitted by the third-order least squares method;

[0017] The specific shaped shape of the shaped cavity section 8 is fitted by the fourth-order least squares method.

[0018] Further, the length of the conical section 601 is 3λ 1 -5λ 1 , the radius gradually increases from left to right, and the maximum radius is r 1 , r 1 The value of is:

[0019] r 1 = 1.3 * 300 / (2.06 * f 1 * sqrt(ε))

[0020] Among them, f 1 is the X-band frequency, λ 1 is the wavelength corresponding to f 1 , and ε is the dielectric constant of the shaped dielectric rod 6;

[0021] The radius of the cylindrical section 602 is the same as the maximum radius r 1 of the conical section 601, and the length of the cylindrical section 602 is 6λ 1 -8λ 1 ;

[0022] The length of the curve-shaped section 603 is λ 1 -2λ 1 , and the leftmost radius of the curve-shaped section 603 is the same as the radius of the cylindrical section 602;

[0023] Further, the length of the tapered cavity section 11 is 0.9λ 2 -1.5λ2 , the radius gradually decreases from left to right, and the maximum radius is r 2 , r 2 The value of is as follows:

[0024] r 2 = 1.18 * 300 / (3.412 * f 2 )

[0025] where f 2 is the S-band frequency, and λ 2 is the wavelength corresponding to f 2 ; the minimum radius of the tapered cavity section 11 is the same as the radius of the cylindrical section 602;

[0026] The radius of the circular cavity section 12 is the same as the radius of the cylindrical section 602, and the length is 3λ 1 -5λ 1 ;

[0027] The length of the shaped cavity section 8 is 1.5λ 2 -2.5λ 2 , and the radius of the leftmost end of the shaped cavity section 8 is the same as the radius of the cylindrical section 602;

[0028] The length of the open radiation section 9 is λ 2 -2λ 2 , and the open radiation section 9 includes a plurality of cylindrical waveguide cavities with coincident central axes and gradually increasing radii from the rightmost end of the shaped cavity section 8 to the rightmost end of the feed source body 5.

[0029] Furthermore, the projection of the waveguide slot 7 is rectangular, and the long side of the rectangle is parallel to the shaped dielectric rod 6; an I-shaped filter 4 is provided outside the waveguide slot 7. The I-shaped filter 4 includes a plurality of rectangular waveguide cavities 401 with coincident central axes and gradually decreasing radii from the outer surface of the feed source body 5 to the inside of the feed source body 5, and I-shaped cavities 402 inserted between every two adjacent rectangular waveguide cavities 401. The I-shaped cavities 402 gradually decrease in the direction from the outer surface of the feed source body 5 to the inside of the feed source body 5, and the central axis coincides with the central axis of the rectangular waveguide cavity 401. Among them, the lower surface of the innermost rectangular waveguide cavity 401 is the shaped section cavity 4.

[0030] Furthermore. The radius of the circular cavity section (12) is the same as the radius of the cylindrical section (602), and the circular cavity section (12) plays a supporting role for the shaped dielectric rod (6).

[0031] The present invention has the following advantages compared with the background art:

[0032] 1. The present invention uses 8 coaxial probes to couple the S-band differential signal, which is connected through a cable and a differential signal polarization synthesis network to output two S-band TE21-mode circularly polarized signals. The X-band uses a TE21-mode coupler in the form of small-hole coupling to output two X-band TE21-mode circularly polarized signals, enabling the antenna to have the self-tracking function in both the S-band and the X-band.

[0033] 2. The present invention uses a shaped dielectric rod to transmit the X transceiver band signal. By changing the shape of the shaped section of the dielectric rod curve, the standing wave and radiation pattern of the feed in the X-band can be adjusted, thereby controlling the performance of the antenna.

[0034] 3. The present invention uses a shaped dielectric rod to transmit the X transceiver band signal. Through the conical section of the dielectric rod and the tapered section of the waveguide cavity, it transitions to the circular waveguide port and can be connected to the backend network devices with good adaptability.

[0035] 4. The present invention uses a shaped dielectric rod to transmit the X transceiver band signal. Due to the confinement effect of the dielectric rod on high-frequency signals, the X-band and the S-band have a strong isolation effect, avoiding mutual interference between the two bands.

[0036] 5. The present invention uses a waveguide cavity and an I-shaped filter to extract the S-band signal and can adjust the standing wave of the S transceiver band signal.

[0037] 6. The present invention uses a choke groove to adjust the radiation pattern of the feed in the S transceiver band.

[0038] 7. The present invention is small in size, light in weight, does not require debugging, can save a large amount of labor costs, and can quickly realize the assembly of the S / X-band feed system, making it suitable for mass production. Description of the Drawings

[0039] Figure 1 is a schematic structural diagram of an S / X dual-band and dual-tracking feed network in an embodiment of the present invention.

[0040] Figure 2 is Figure 1 the sectional view of.

[0041] Figure 3 is a schematic block diagram of the differential signal polarization synthesis network in an embodiment of the present invention.

[0042] Among them, S / X dual-frequency feed - 1, TE21 mode coupler with small-hole coupling type - 2, S-band self-tracking feed network - 3, I-shaped filter - 4, feed body - 5, shaped dielectric rod - 6, waveguide slot - 7, shaped cavity section - 8, open radiation cavity section - 9, circular choke groove - 10, tapered cavity section - 11, circular cavity section - 12, differential signal polarization synthesis network - 301, cable - 302, coaxial probe - 303, rectangular waveguide cavity - 401, I-shaped cavity - 402, conical section - 601, cylindrical section - 602, curve-shaped section - 603. Specific Embodiment

[0043] The following combines specific embodiments and appendices Figures 1 - 3 to further describe the present invention:

[0044] As Figure 1 shown, a kind of S / X dual-frequency and dual-tracking feed network includes an S / X dual-frequency feed 1 and an S-band self-tracking feed network and an X-band self-tracking feed network connected to the S / X dual-frequency feed 1. The rightmost end of the S / X dual-frequency feed 1 is an S-band signal open radiation cavity section 9. A circular choke groove 10 centered on the open radiation cavity section 9 is provided on the right surface of the S / X dual-frequency feed 1. The X-band self-tracking feed network is a TE21 mode coupler 2 with a small-hole coupling type; the S-band self-tracking feed network 3 includes a differential signal polarization synthesis network 301, eight cables 302 and eight coaxial probes 303;

[0045] Among them, the differential signal polarization synthesis network 301 includes eight input ports and two output ports. The differential signal polarization synthesis network 301 is sleeved on the outer surface of the S / X dual-frequency feed 1. The eight coaxial probes 303 are distributed at 45° along the outer surface of the circular choke groove 10 of the S / X dual-frequency feed. One end of the coaxial probe 303 is inserted into the inside of the circular choke groove 10; the other end is connected to the differential signal polarization synthesis network 301 through a cable 302. The two output ports of the differential signal polarization synthesis network 301 respectively output the left-handed and right-handed tracking signals of the S-band signal.

[0046] Specifically, as Figure 3The figure shows the schematic diagram and principle block diagram of the differential signal polarization synthesis network. The differential signal polarization synthesis network adopts a circular ring design, making the feed network structure compact. Eight cables are connected to the differential signal stepped coaxial probes, and two ports are output. The internal uses the microstrip circuit design method to realize the output of the left-handed and right-handed signals of the differential signal through a 180-degree bridge, a 90-degree bridge, a load, etc. The shape of the differential signal polarization synthesis network is specially designed and can be closely connected to the feed body, reducing the volume of the feed network system. The X-band uses a TE21 mode coupler with a small hole coupling type to output two-way X-band TE21 mode circularly polarized signals, enabling the antenna to have the self-tracking function in the S-band and X-band. This S / X dual-frequency feed network system has a compact structure and does not require debugging, making the radiation pattern of the feed have a larger illumination angle for the illumination of the ring focus antenna. This feed system is small in size, light in weight, and does not require debugging, which can save a large amount of labor costs and is suitable for engineering promotion.

[0047] Further, the coaxial probe 303 includes a flange and connectors located on both sides of the flange. The connector connected to the cable is an N-50K connector. The connector inserted into the inner part of the circular ring choke groove 10 includes a metal rod connected to the N-50K connector and a metal mushroom head connected to the end of the metal rod. The metal rod and the metal mushroom head are connected by threads.

[0048] Further, as Figure 2 shown, the S / X dual-frequency feed 1 includes a feed body 5; a waveguide cavity penetrating from left to right is provided inside the feed body 5, and four waveguide slots 7 distributed at 90° are provided on the circumference of the waveguide cavity; a shaped dielectric rod 6 is provided on the central axis inside the waveguide cavity; the shaped dielectric rod 6 is a conical section 601, a cylindrical section 602, and a curve-shaped section 603 from left to right; the waveguide cavity is a tapered cavity section 11, a circular cavity section 12, a shaped cavity section 8, and an open radiation cavity section 9 from left to right; the waveguide slots 7 are provided on the circumference of the shaped cavity section 8;

[0049] Among them, the specific shaped shape of the curve-shaped section 603 is fitted by 5 discrete control points using the third-order least squares method, and the horizontal and vertical axis coordinates of the 5 control points are optimized through an optimization algorithm;

[0050] The specific shaped shape of the shaped cavity section 8 is fitted by 7 discrete control points using the fourth-order least squares method, and the horizontal and vertical axis coordinates of the 7 control points are optimized through an optimization algorithm;

[0051] The optimization algorithms for the curve-shaped section 603 and the shaped cavity section 8 both take the shaped shape with a standing wave better than 1.5:1, the illumination level of the feed radiation pattern illumination angle between -8 dB and -15 dB, and the equalization better than 3 dB within the illumination angle as the best optimization result.

[0052] Further, the length of the conical section 601 is 3λ 1 -5λ 1 , and the radius gradually increases from left to right, with the maximum radius being r 1 , r 1 The value of r is as follows:

[0053] r 1 = 1.3 * 300 / (2.06 * f 1 * sqrt(ε))

[0054] where f 1 is the X-band frequency, λ 1 is the wavelength corresponding to f 1 , and ε is the dielectric constant of the shaped dielectric rod 6;

[0055] The radius of the cylindrical section 602 is the same as the maximum radius r of the conical section 601 1 , and the length of the cylindrical section 602 is 6λ 1 -8λ 1 ;

[0056] The length of the curve-shaped section 603 is λ 1 -2λ 1 , and the leftmost radius of the curve-shaped section 603 is the same as the radius of the cylindrical section 602;

[0057] Specifically, the direction from the conical section to the curve-shaped section is the direction of X-band signal transmission, and the direction from the curve-shaped section to the conical section is the direction of X-band signal reception. In this embodiment, the above data is calculated using f 1 = 7.7 GHz, λ 1 = 38.96 mm, and ε = 2.5. The diameter of the conical section of the shaped dielectric rod gradually decreases in the direction of X-band signal reception, matching the air waveguide, so that the feed system has a low reflection coefficient. The curve-shaped section is fitted using the least squares method, and the diameter gradually decreases in the direction of X-band signal transmission, so that the feed has a large irradiation angle, and the irradiation level at about 50° half-irradiation angle is between -12 dB and -16 dB, which can maximize the X-band efficiency of the antenna and obtain the maximum antenna gain.

[0058] Further, the length of the taper-changed cavity section 11 is 0.9λ 2 -1.5λ 2 , and the radius gradually decreases from left to right, with the maximum radius being r 2 , r 2 The value of r is as follows:

[0059] r 2 = 1.18 * 300 / (3.412 * f 2 )

[0060] where f2 is the S - band frequency, and λ 2 is f 2 is the corresponding wavelength; the minimum radius of the tapered cavity section 11 is the same as the radius of the cylindrical section 602;

[0061] The radius of the circular cavity section 12 is the same as the radius of the cylindrical section 602, and its length is 3λ 1 - 5λ 1 ; The circular cavity section 12 cooperates with the cylindrical section 602 to support the shaped dielectric rod 6;

[0062] The length of the shaped cavity section 8 is 1.5λ 2 - 2.5λ 2 , and the radius of the left - most end of the shaped cavity section 8 is the same as the radius of the cylindrical section 602;

[0063] The length of the open - ended radiation section 9 is λ 2 - 2λ 2 , and the open - ended radiation section 9 includes a plurality of cylindrical waveguide cavities with coincident central axes, and the radii gradually increase from the right - most end of the shaped cavity section 8 to the right - most end of the feed body 5.

[0064] Specifically, the diameter of the tapered cavity section gradually increases in the direction of X - band signal reception, transitioning to the size of the X - band air - filled circular waveguide, and the rear end can be connected to an X - band air - waveguide device, such as a TE21 - mode tracker in the form of small - hole coupling, with good adaptability; the diameter of the shaped cavity section gradually increases in the direction of S - band signal transmission, so that the S - band signal pattern has a larger irradiation angle.

[0065] In this embodiment, the above data is calculated using f 2 = 2GHz, λ 2 = 150mm, and the shaped dielectric rod is adhesively fixed to the circular cavity section.

[0066] Furthermore, the projection of the waveguide slot 7 is rectangular, and the long side of the rectangle is parallel to the shaped dielectric rod 6; an I - shaped filter 4 is provided outside the waveguide slot 7. The I - shaped filter 4 includes a plurality of rectangular waveguide cavities 401 with coincident central axes and gradually decreasing in size from the outer surface of the feed body 5 to the inside of the feed body 5, and I - shaped cavities 402 inserted between every two adjacent rectangular waveguide cavities 401. The I - shaped cavities 402 gradually decrease in size from the outer surface of the feed body 5 to the inside of the feed body 5, and the central axis coincides with the central axis of the rectangular waveguide cavity 401. Among them, the lower surface of the innermost rectangular waveguide cavity 401 is the shaped cavity section 8.

[0067] Specifically, the waveguide slot and the I - shaped filter interact to couple out the S - band signal, making the feed system have a low reflection coefficient.

[0068] The receiving process of the S-band sum signal (the receiving and transmitting processes of the sum signal are reciprocal) is as follows: The S-band sum signal irradiates into the open radiation cavity section of the waveguide cavity, exciting two degenerate TE11 modes. After passing through the shaped cavity section, one of the modes is coupled out by a pair of waveguide slots corresponding to 180 degrees and a pair of I-shaped filters, and the other mode is coupled out by another pair of waveguide slots corresponding to 180 degrees and I-shaped filters.

[0069] The receiving process of the X-band sum signal (the receiving and transmitting processes of the sum signal are reciprocal) is as follows: The X-band sum signal irradiates into the shaped dielectric rod, exciting two degenerate TE11 modes through the curved shaping section of the dielectric rod, coupling into the dielectric rod and propagating backward through the cylindrical section. Through the combined action of the conical section and the tapered cavity section of the waveguide cavity, the energy is coupled into the air waveguide.

[0070] In summary, the present invention can achieve the TE21 mode tracking function in the S / X band, and also has the advantages of compact structure, easy processing, excellent electrical performance, etc., and can meet the requirements of the ring focus antenna system.

[0071] It should be noted that the above description and examples are helpful for those skilled in the art to understand the present invention, but do not limit the protection scope of the present invention. Any implementation made by various deformations, scalings, modifications, improvements and / or simplifications without departing from the essential content of the present invention shall fall within the protection scope of the present invention.

Claims

1. An S / X dual-frequency dual-tracking feed network, comprising an S / X dual-frequency feed (1), an S-band self-tracking feed network (3) and an X-band self-tracking feed network connected to the S / X dual-frequency feed (1). The rightmost end of the S / X dual-frequency feed (1) is an S-band signal open radiation cavity section (9). A circular choke groove (10) centered on the open radiation cavity section (9) is provided on the right surface of the S / X dual-frequency feed (1). The X-band self-tracking feed network is a TE21 mode coupler (2) of a small hole coupling type; It is characterized in that the S-band self-tracking feed network (3) includes a difference signal polarization synthesis network (301), eight cables (302) and eight coaxial probes (303); the coaxial probe (303) includes a flange and connectors located on both sides of the flange. The connector connected to the cable is an N-50K connector. The connector inserted into the circular choke groove (10) includes a metal rod connected to the N-50K connector and a metal mushroom head connected to the end of the metal rod. The metal rod and the metal mushroom head are connected by threads; wherein, the difference signal polarization synthesis network (301) includes eight input ports and two output ports. The difference signal polarization synthesis network (301) is sleeved on the outer surface of the S / X dual-frequency feed (1). The eight coaxial probes (303) are distributed at 45° along the outer surface of the circular choke groove (10) of the S / X dual-frequency feed. One end of the coaxial probe (303) is inserted into the circular choke groove (10), and the other end is connected to the difference signal polarization synthesis network (301) through a cable (302). The two output ports of the difference signal polarization synthesis network (301) respectively output the left-handed and right-handed tracking signals of the S-band signal; the S / X dual-frequency feed (1) includes a feed body (5); a waveguide cavity body penetrating from left to right is provided in the feed body (5). Four waveguide slots (7) distributed at 90° are provided on the circumference of the waveguide cavity body. A shaped dielectric rod (6) is provided on the central axis in the waveguide cavity body; the shaped dielectric rod (6) is a conical section (601), a cylindrical section (602) and a curve-shaped section (603) from left to right. The waveguide cavity body is a tapered cavity section (11), a circular cavity section (12), a shaped cavity section (8) and an open radiation cavity section (9) from left to right. The waveguide slot (7) is provided on the circumference of the shaped cavity section (8); wherein, the specific shaped shape of the curve-shaped section (603) is fitted by using the third-order least squares method; the specific shaped shape of the shaped cavity section (8) is fitted by using the fourth-order least squares method; The projection of the waveguide slot (7) is rectangular, and the long side of the rectangle is parallel to the shaped dielectric rod (6); an I-shaped filter (4) is provided outside the waveguide slot (7). The I-shaped filter (4) includes a plurality of rectangular waveguide cavities (401) with coincident central axes and gradually decreasing from the outer surface to the inside of the feed body (5), and I-shaped cavities (402) inserted between every two adjacent rectangular waveguide cavities (401). The I-shaped cavities (402) gradually decrease in the direction from the outer surface to the inside of the feed body (5), and the central axis coincides with the central axis of the rectangular waveguide cavity (401). Among them, the lower surface of the innermost rectangular waveguide cavity (401) is the shaped cavity section (8).

2. A kind of S / X dual-frequency and dual-tracking feed source network according to claim 1, characterized in that, The length of the conical section (601) is 3λ 1 -5λ 1 , the radius gradually increases from left to right, and the maximum radius is r 1 , r 1 The value range of is: r 1 = 1.3 * 300 / (2.06 * f 1 * sqrt(ε)) Among them, f 1 is the X-band frequency, λ 1 is the wavelength corresponding to f 1 , and ε is the dielectric constant of the shaped dielectric rod (6); The radius of the cylindrical section (602) is the same as the maximum radius r of the conical section (601). 1 The length of the cylindrical section (602) is 6λ 1 -8λ 1 ; The length of the curve profiling section (603) is λ 1 -2λ 1 , and the radius of the leftmost end of the curve profiling section (603) is the same as the radius of the cylindrical section (602).

3. A kind of S / X dual-frequency and dual-tracking feed source network according to claim 2, characterized in that, The length of the tapered cavity section (11) is 0.9λ 2 -1.5λ 2 , and the radius gradually decreases from left to right, with the maximum radius being r 2 , r 2 The value of r is as follows: r 2 ＝1.18*300 / (3.412*f 2 ) where f 2 is the S-band frequency, λ 2 is the wavelength corresponding to f 2 ; the minimum radius of the tapered cavity section (11) is the same as the radius of the cylindrical section (602); The radius of the circular cavity section (12) is the same as that of the cylindrical section (602), and the length is 3λ 1 -5λ 1 ; The length of the shaped cavity section (8) is 1.5λ 2 -2.5λ 2 , and the radius of the leftmost end of the shaped cavity section (8) is the same as the radius of the cylindrical section (602); The length of the open radiation cavity section (9) is λ 2 -2λ 2 , and the open radiation cavity section (9) includes a plurality of cylindrical waveguide cavities with coincident central axes and gradually increasing radii from the rightmost end of the shaped cavity section (8) to the rightmost end of the feed body (5).

4. A kind of S / X dual-frequency and dual-tracking feed source network according to claim 3, characterized in that, The radius of the circular cavity section (12) is the same as that of the cylindrical section (602), and the circular cavity section (12) plays a supporting role for the shaped dielectric rod (6).

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