TW201308746A - Dual-band feed horn - Google Patents

Abstract

A dual-band feed horn includes an outer feed horn for receiving a satellite signal of a relatively lower band, and an inner feed horn for receiving a satellite signal of a relatively higher band. The outer feed horn has a first wave guiding space having an open end and a closed end. The inner feed horn is mounted to the outer feed horn and provided with a second wave guiding space having an end coaxially plugged with a dielectric waveguide. At least one part of the second wave guiding space is coaxial with the first wave guiding space and is located inside the outer feed horn, such that the first and second wave guiding spaces of the outer and inner feed horns can both be aimed at the focal point of a satellite dish, upon which the dual-band feed horn is mounted, for receiving two satellite signals of different band.

Description

Dual frequency waveguide

The present invention relates to a feed horn that is mounted at a reflective focus position of a dish antenna and that receives satellite signals of a particular frequency band, and more particularly to a satellite signal (eg, Ku) for receiving two different frequency bands, respectively. The Ku band signal and the S band signal are coaxially arranged with one of the waveguide and the outer waveguide of the dual frequency waveguide.

During the transmission and reception of satellite signals, a feed horn is used to receive signals from satellites and feed the received satellite signals to a signal processor (such as a low noise downconverter ( Low noise block downconvertor), hereinafter referred to as LNB), when the waveguide is used with a parabolic dish, the optimal position of the waveguide is at the reflection focus of the dish antenna. At this time, the waveguide can most effectively receive the satellite signal reflected by the dish antenna.

The early satellite TV signals sent to a single satellite were received by a set of satellite signal receiving devices including a dish antenna, a waveguide and an LNB. To receive satellite signals from two satellites, This is achieved by using two sets of satellite signal receiving devices. If the user wants to receive different satellite signals transmitted by two similar satellites at the same time, or two different frequency-frequency satellite signals from the same satellite, for example, one is the S-band and the other is the Ku-band satellite signal, the current practice The two waveguides respectively receiving different satellite signals are arranged side by side on the same dish antenna. However, the waveguide tube occupies a certain space, and the waveguides receiving different wave frequencies have different apertures, for example, receiving the S-band. The diameter of the waveguide is much larger than the diameter of the waveguide of the receiving Ku band, and the focusing range of the dish has a certain limit. Therefore, the current method of juxtaposing two waveguides on the same dish antenna will be Since the two waveguides cannot be surely disposed at the same time at the reflection focus of the dish antenna, the satellite signal strength that each waveguide can receive is degraded. Secondly, the juxtaposed waveguide has a relatively large volume, which relatively increases the shielding rate of the effective signal receiving area of the dish antenna. In other words, how to set up two kinds of waveguides that can effectively receive satellite signals of two different frequency bands emitted by adjacent satellites or the same satellite in a limited dish antenna space, the system strives to solve the problem.

In view of the above, one of the objectives of the present invention is to provide a dual-frequency waveguide having a satellite signal for receiving different frequency bands and coaxially arranging one of the first waveguide space and a second waveguide space. When the dual-frequency waveguide is mounted on a dish antenna, the first and second waveguide spaces can simultaneously correspond to the reflection focus position of the dish antenna to achieve a good satellite signal receiving effect.

Another object of the invention is to provide a dual frequency waveguide having first and second waveguides disposed substantially coaxially such that they have a smaller volume.

In order to achieve the above object, a dual-frequency waveguide provided by the present invention includes an outer feed horn for receiving and feeding a first satellite signal to a low noise down-converter, and a Receiving and feeding a second satellite signal to an inner feed horn of the low noise down-converter, wherein the frequency of the second satellite signal is higher than the frequency of the first satellite signal. The outer waveguide has a first waveguide space, a horizontally polarized probe and a vertically polarized probe, and the probes respectively protrude in the first waveguide space and are projected on the first guide One of the wave spaces appears perpendicular to each other in the transverse section. The inner waveguide has a tube body, a dielectric waveguide disposed at one end of the tube body, a base connected to the other end of the tube body, and a waveguide member made of the dielectric material. The tube body and the second waveguide space defined by the base, and one of the horizontally polarized probes and a vertically polarized probe which are perpendicular to each other when projected on a lateral section of the second waveguide space. The base is connected to the outer waveguide, and is connected in such a manner that at least a portion of the tubular body and the dielectric material waveguide member are located coaxially with the first waveguide space in the outer waveguide. Therefore, when the dual-frequency waveguide is mounted on a dish antenna, the first guided waveguide space and the second guided waveguide space disposed coaxially can simultaneously reflect the reflected focus of the positive-disc antenna, and effectively receive the first respectively. Satellite signal and second satellite signal. Secondly, since the dielectric material waveguide member of the inner waveguide tube is disposed coaxially with the tube system in the outer waveguide tube, the overall volume of the dual-frequency waveguide tube of the present invention can be effectively reduced, thereby achieving a reduced dish shape. The antenna receives the shielding effect of the satellite signal.

In the dual frequency waveguide provided by the present invention, the first satellite signal is preferably (but not limited to) a S band satellite signal, and the second satellite signal is preferably (but not limited to) Ku. Ku band satellite signal.

In the dual-frequency waveguide of the present invention, the outer waveguide may include an open end, and a closed end having a central perforation, and the first guided space is between the open end Between the portion and the closed end. The base of the inner waveguide is fixed to the closed end, and the tube system of the inner waveguide passes through the central perforation of the closed end and at least a portion is coaxially located with the first waveguide space. In the first guided wave space.

Preferably, the base of the inner waveguide tube is provided with an arc-shaped slot, and the inner waveguide tube is fixed by a circular arc hole passing through the base and combined with the closed end portion of the outer waveguide tube. Pieces (such as screws or other suitable components) are combined with the outer waveguide. In this way, the base can be rotated and positioned relative to the outer waveguide in the range of the arc-shaped slot to adjust the azimuth of the inner waveguide tube relative to the outer waveguide, so that the inner guided wave The tube can effectively receive the second satellite signal.

In an embodiment provided by the present invention, the outer waveguide tube is composed of a wave collecting portion having the open end portion, and a tube body that is coupled to the wave collecting portion and has the closed end portion. However, the waveguide is not limited to the aforementioned configuration, and for example, the outer waveguide may be an integrally formed tubular member.

Preferably, the outer waveguide comprises a wave collecting portion and a tubular body, the tubular body having an open end that is coupled to the collecting portion, and a closed end portion having a central perforation; the inner waveguide The base is fixed to the closed end, and the tube system of the inner waveguide passes through the central perforation of the closed end and at least a portion is coaxially located with the outer waveguide of the outer waveguide In the tube body.

In the present invention, the structure of the wave collecting portion of the outer waveguide is not particularly limited. For example, the collecting portion may include a set of fixing rings provided at an open end of the tube fixed to the outer waveguide, and a The outer circumference of the fixing ring faces the outer trumpet-shaped guiding portion.

Alternatively, the concentrating portion may include a set of fixing rings provided at an open end of the tube body fixed to the outer waveguide tube, and at least one annular guiding portion surrounding the outer peripheral surface of the fixing ring.

Preferably, at least a portion of the dielectric material waveguide member of the inner waveguide is located in the guiding portion of the wave collecting portion. That is, the position of the dielectric material waveguide is located near the entrance end of the wave collecting portion to effectively guide the second satellite signal.

In an embodiment provided by the present invention, the inner surface of the closed end portion of the outer waveguide tube forms a reflecting surface, and the horizontally polarized probe and the vertically polarized probe of the outer waveguide The protrusions respectively protrude from the tube of the outer waveguide, and the distance between any one and the reflecting surface is 2N+1 times of a quarter wavelength of the satellite signal that the outer waveguide is intended to receive (N Is a positive integer). For example, one of the distances may be, but is not limited to, 1/4 λ or 3/4 λ, and the other distance may be, but is not limited to, 1/4 λ or 3/4 λ. Here "λ" represents the wavelength of the received satellite signal.

Preferably, the horizontally polarized probes respectively protruding in the body of the outer waveguide are not in the same plane as the vertically polarized probe system. For example, one of the probes has a distance of 3/4λ from the reflecting surface and the other is 1/4λ.

In an embodiment of the present invention, the base of the inner waveguide has an accommodating space, which is coaxially corresponding to the inner space of the inner tube of the inner waveguide, and the tube of the inner waveguide The internal space of the body forms the second guided wave space together. However, the structure of the second waveguide space is not limited to the foregoing, for example, the second waveguide space may be completely formed by the internal space of the tube of the inner waveguide.

In the embodiment mentioned in the preceding paragraph, the base of the inner waveguide has a reflecting surface at the bottom end of the accommodating space, and the horizontally polarized probe and the vertically polarized probe of the inner waveguide are respectively The protrusion protrudes into the accommodating space of the base, and one of the distances from the reflecting surface of the base is a quarter wavelength of the satellite signal that the inner waveguide is intended to receive.

Preferably, a reflective member protrudes from the accommodating space of the base of the inner waveguide, and the reflective member is located between the horizontally polarized probe and the vertically polarized probe, and is closer to the inner guide. One of the probes of the tube of the wave tube is at a quarter wavelength of the satellite signal that the inner waveguide is intended to receive.

In an embodiment of the present invention, the dielectric material waveguide of the inner waveguide has an outer end and an inner end opposite to the outer end and plugged in the tube of the inner waveguide unit.

Preferably, the outer end portion of the dielectric material waveguide has a central tapered portion, an annular portion coaxially surrounding the central tapered portion, and a central portion of the tapered portion and the ring. An annular groove between the segments. Thereby a good side wave suppression effect is achieved.

Preferably, the inner end portion of the dielectric material waveguide has a central tapered portion, an annular portion coaxially surrounding the central tapered portion, and a central portion of the tapered portion and the annular portion. An annular groove between the portions, and a fixing ring coaxially surrounding the central tapered portion on a circumference of the annular portion, the fixing ring being plugged in the tubular body of the inner waveguide.

The details and features of the dual-frequency waveguide provided by the present invention will be described in the detailed description of the subsequent embodiments. However, it should be understood by those of ordinary skill in the art that the present invention is not limited to the scope of the invention.

The technical content and features of the present invention will be described in detail below with reference to the accompanying drawings, wherein the first figure is the dual-frequency waveguide provided by the first preferred embodiment of the present invention. The second figure is a perspective view of another dual-frequency waveguide of the first preferred embodiment of the present invention; the third figure is a dual-frequency guide provided by the first preferred embodiment of the present invention. A perspective view of a dual-frequency waveguide provided by a first preferred embodiment of the present invention; and a fifth aspect of the present invention is a dual-frequency transmission provided by the first preferred embodiment of the present invention. A longitudinal cross-sectional view of the base of the waveguide in the waveguide; the sixth diagram is a partial end view of the base of the inner waveguide; and the seventh diagram is a dual-frequency waveguide provided by the second preferred embodiment of the present invention. 3 is a perspective view of a dual-frequency waveguide provided by a third preferred embodiment of the present invention; and a ninth diagram is a perspective exploded view showing another possible implementation of the inner waveguide base. kind.

Please refer to the first to seventh figures. The dual-frequency waveguide 10 provided by the first preferred embodiment of the present invention mainly includes a first satellite signal to receive and feed a low-frequency down-converter. a waveguide 20, and an inner waveguide 30 for receiving and feeding a second satellite signal to another low noise downconverter, wherein the frequency of the second satellite signal is higher than the frequency of the first satellite signal For example, the first satellite signal is a radio frequency satellite signal such as a lower frequency band of the S band, and the second satellite signal is a radio frequency satellite signal of a higher frequency band such as the Ku band. However, the types of the first and second satellite signals are not limited to the foregoing.

The outer waveguide 20 has an open end 20a, a closed end 20b, and a first waveguide space 20c interposed between the open end 20a and the closed end 20b. In detail, the outer waveguide 20 is mainly composed of a wave collecting portion 22 having the open end portion 20a, and a cylindrical tubular body 24 engaging with the collecting portion 22 and having the closed end portion 20b. The inner space of the pipe body 24 can form the first waveguide space 20c, or the inner space of the pipe body 24 and the inner space of the wave collecting portion 22 can define the first waveguide space. 20c. However, the outer waveguide 20 is not limited to the aforementioned configuration, and for example, the outer waveguide 20 may be an integrally formed tubular member. Next, a horizontally polarized probe 26 and a vertically polarized probe 28 are disposed in the tubular body 24, and the probes 26 and 28 are vertically passed through the wall of the tubular body 24 to be respectively suspended and suspended. In the first waveguide space 20c, and when the probes 26, 28 are projected on a lateral section of the first waveguide space 20c (for example, on the bottom of the tube), they are perpendicular to each other for Receiving two kinds of electromagnetic waves whose electric field vibration directions are perpendicular to each other in the same frequency band. In addition, a peripheral portion of the tube body is provided with a base 29 for processing the LNB of the first satellite signal, and the base 29 is provided with an LNB electronic circuit electrically connected to the probes 26 and 28 (Fig. Not shown). It should be noted that the location of the LNB is not limited to the foregoing, and the working principles of the probes 26, 28 and the LNB are conventional techniques, and thus are not described herein.

Further, the concentrating portion 22 has a fixing ring 22a fixed to the open end portion 24a of the tube body 24 of the outer waveguide tube 20, and a first diameter that surrounds the outer circumferential surface of the fixing ring 22a and sequentially increases in diameter. The annular guide portion 22b and the second annular guide portion 22c. However, the structural features of the concentrating portion 22 may be correspondingly changed to a rectangular shape, a circular shape, or an elliptical shape depending on the polarization type of the first satellite signal to be received, such as linear polarization, circular polarization, or elliptical polarization. Or gradually change from the elliptical outline to a circular shape, so it is not limited to the circular structure that receives the circular polarization; and the structural size is designed according to the specification of the signal gain or the side-wave suppression bandwidth, so For example, the dual-frequency waveguide 10 provided by the second preferred embodiment of the present invention disclosed in the seventh embodiment is exemplified, and the concentrating portion 22 is only provided with an annular guiding portion 22b. Alternatively, as shown in the eighth embodiment of the present invention, the dual-frequency waveguide 10 is provided as an example. The concentrating portion 22 has an outer trumpet extending from the outer circumferential surface of the fixing ring 22a (ie, The guide portion 22b is gradually enlarged in diameter. In other words, the wave collecting portions of the various shapes described above or the wave collecting portions of other shapes can be applied to the dual-frequency waveguide 10 provided by the present invention.

Secondly, the tubular body 24 is basically a cylindrical tubular body which is open at one end and closed at the other end. In detail, the tube body 24 has an open end portion 24a that is engaged with the wave collecting portion 22, and a closed end portion 24c (having a closed end portion 20b of the outer waveguide tube 20) having a central through hole 24b. And a cylindrical interior space between the open end 24a and the closed end 24c. Next, the inner surface 24d of the closed end of the tubular body forms a reflecting surface, and the horizontally polarized probe 26 of the outer waveguide and the distance between the vertically polarized probe 28 and the reflecting surface 24d are predetermined. An odd multiple of a quarter of the wavelength of the received first satellite signal; of course, to maintain the isolation of the vertical and horizontal polarization signals, and based on signal strength and space saving considerations, the horizontally polarized probe 26 can be The distance from the vertically polarized probe 28 and the reflecting surface 24d is respectively three-quarters and one-quarter of the wavelength of the first satellite signal to be received, that is, 3/4λ and 1/4λ. In other words, when the probes 26, 28 protrude into the inner space of the tubular body 24, there are high and low drops which are not in the same plane.

The inner waveguide tube 30 mainly comprises a cylindrical body 32 having two ends open, a dielectric waveguide 34 disposed at one end of the tube 32, and a third connected to the tube 32. a base 36 fixed at one end and fixed to the closed end portion 24c of the outer tube 20 of the outer waveguide 20, whereby the dielectric material waveguide 34, the inner space of the tube 32, and the base 36 define a first The second guided wave space 30a.

In this embodiment, the base 36 of the inner waveguide 30 can be implemented by using a base of the LNB for processing the second satellite signal. In other words, the base 36 is used to connect the outer waveguide 20 and support the tube. The body 32 and the dielectric material waveguide 34 are disposed in the first waveguide space 20c, and an electronic circuit (not shown) of the LNB can be accommodated in the base. On the other hand, the base 36 has a cylindrical accommodating space 36a coaxially communicating with the inner space of the tubular body 32 of the inner waveguide 30, together with the internal space of the inner waveguide tube 32. The second waveguide space 30a is formed. However, the structure defining the second waveguide space 30a is not limited to the foregoing, for example, the second waveguide space 30a may be completely constituted by the internal space of the tube 32 of the inner waveguide.

Next, the inner waveguide 30 further includes a horizontally polarized probe that protrudes from the second waveguide space 30a and projects perpendicular to one of the second waveguide spaces 30a. 38 and a vertically polarized probe 40. In detail, the base 36 of the inner waveguide 30 has a reflective surface 36b at the bottom end of the accommodating space 36a, and the horizontally polarized probe 38 and the vertically polarized probe 40 of the inner waveguide 30 The protrusions are respectively protruded into the accommodating space 36a of the base 36, and the distance from the reflecting surface 36b of the base 36 (such as the vertically polarized probe 40 in this embodiment) and the reflecting surface 36b are predetermined. An odd multiple of a quarter of the wavelength of the received second satellite signal is one quarter of the wavelength of the second satellite signal, ie, 1/4 λ, in terms of signal strength and space saving considerations. In addition, a reflector 42 is disposed between the horizontally polarized probe 38 and the vertically polarized probe 40, and the distance between the reflector 42 and the horizontally polarized probe 38 is 1/4λ, which is the same as the above. The vertically polarized probe 40 is used for signal strength and space saving, and is used to enhance the signal reflection effect of horizontally polarized electromagnetic waves. In other words, when the probes 38, 40 protrude in the second waveguide space 30a, there are high and low drops which are not in the same plane. However, the configuration of the probes 38, 40 is not limited to the foregoing. For example, please refer to the ninth figure, which is another feasible guide wave provided by the applicant in Taiwan Patent Publication No. 511783. A perspective exploded view of the tube base 36', wherein the horizontally polarized probe 38' and the vertically polarized probe 40' are built on the circuit board 44 of the LNB and are on the same level.

In addition, please refer to the second and fourth to sixth figures, the base 36 has a circular flange 36c, and a plurality of arcuate slots 36d extending through the flange 36c in an equiangular manner, and the receiving portion The wall of the inlet end of the space 36a is provided with a thread 36e. In this way, the base 36 can be engaged with the tubular body 32 by the thread 36e, and the end portion 20b can be closed by respectively passing through the arc-shaped slots 36d of the base and locking to the outer waveguide 20. The fixing member such as the screw 36f allows the base 36 to be fixed to the outer waveguide 20. At this time, the tube body 32 of the inner waveguide tube 30 passes through the central through hole 24b of the closed end portion 20b of the outer waveguide tube 20, and is supported by the dielectric material waveguide member 34 in the first waveguide space. The axial position of 20c, that is, coaxially suspended in the tubular body 24 of the outer waveguide 20. In addition, when the base 36 is fixed to the closed end portion 20b of the outer waveguide 20 by the design of the arcuate slot 36d, the base 36 can be disposed at the left and right ends of the arcuate slot 36d. Within the defined range, the outer waveguide 20 is coaxially rotated to a specific azimuth of the corresponding second satellite signal transmitting end, and then the position of the base 36 is fixed by a screw 36f to ensure the horizontally polarized probe 38 and The vertically polarized probe 40 is capable of effectively receiving the second satellite signal. In other words, by the design of the arc-shaped slot 36d, the dual-frequency waveguide 10 provided by the present invention can adjust the azimuth angle of the inner waveguide 30 of the inner tube 28 with respect to the outer waveguide 20, so that the The inner waveguide 30 can effectively receive satellite signals. These designs, which adjust the azimuth of the inner waveguide 30, are particularly useful when the first and second satellite signals are transmitted by two different but similar satellites. If the first and second satellite signals are transmitted by the same satellite, the base 36 may be directly fixed to the outer waveguide 20 without the aforementioned adjustment mechanism, for example, using the base 36 shown in FIG. 'Design, the horizontally polarized probe 38' and the vertically polarized probe 40' are built on the circuit board 44, and the base 36' is directly inserted through a through hole of the base flange by a screw (not shown). It is fixed on the outer waveguide 20.

The dielectric material waveguide 34 of the inner waveguide 30 is used to guide the high frequency satellite signal, since the waveguide 34 is made of, for example, polycarbonate, polyethylene, polypropylene. ), polystyrene, and a dielectric material such as acrylonitrile-butadiene-styrene, and thus the low frequency satellite received by the outer waveguide 20 The signal will not have an effect. Structurally, the dielectric material waveguide 34 has an outer end portion 34a and an inner end portion 34b opposite to the outer end portion 34a and plugged into the tube body 32 of the inner waveguide tube 30. The second satellite signal is introduced into the second waveguide space 30a. Further, the outer end portion 34a has a central tapered portion 34a1, an annular portion 34a2 coaxially surrounding the central tapered portion 34a1 coaxially with the central tapered portion 34a1, and a central tapered portion 34a1 and the ring. An annular groove 34a3 between the portions 34a2. By the design of the annular portion 34a2 and the annular groove 34a3, a good side wave suppression effect can be achieved. Similarly, the inner end portion 34b of the dielectric material waveguide member 34 has a central tapered portion 34b1, and an annular portion 34b2 which is coaxial with the central tapered portion 34b1 at the periphery of the central tapered portion 34b1. An annular groove 34b3 between the tapered portion 34b1 and the annular portion 34b2, and a fixing ring 34b4 coaxial with the central tapered portion 34b1 around the circumference of the annular portion 34b2. During assembly, the fixing ring 34b4 is plugged into the tube 32 of the inner waveguide 30, so that the dielectric material waveguide 34 and the tube 32 can be coaxially coupled. At this time, a part of the dielectric material waveguide 34 is located in the guiding portion 22b of the wave collecting portion 22. That is, the dielectric material waveguide 34 is disposed adjacent to the entrance end of the wave collecting portion 22 to effectively guide the second satellite signal. However, the structural features of the outer end portion 34a and the inner end portion 34b of the dielectric material waveguide member 34 are required to receive polarization types of the second satellite signal such as linear polarization, circular polarization, or elliptical polarization. Differently, the corresponding change can be rectangular, circular, elliptical or gradually turned from circular to circular, so it is not limited to the circular structure of receiving circular polarization; and depending on its signal gain or side wave suppression frequency The structural dimensions are designed in a wide gauge, and thus are not limited to the number of rings of the annular portions 34a2, 34b2 of the coaxial double-ring configuration.

With the above structural design, the inner waveguide 36 is fixed to the closed end portion 20b of the outer waveguide 20 such that the inner waveguide 30 body 32 and the dielectric material waveguide 34 are compatible with each other. The first waveguide space 20c is coaxially located in the outer waveguide 20, and therefore, when the dual-frequency waveguide 10 provided by the present invention is mounted on a dish antenna (not shown), the coaxial arrangement is The first guided wave space 20c and the second guided wave space 30a can simultaneously face the reflected focus of the positive dish antenna, and effectively receive the first satellite signal and the second satellite signal, respectively. Next, since the dielectric material waveguide 34 of the inner waveguide 30 is disposed coaxially with the tube 32 in the outer waveguide 20, it is similar to the conventional dual-frequency waveguide provided by the parallel configuration. In contrast, the dual frequency waveguide 10 of the present invention has a smaller overall volume.

Finally, it should be noted that the dual-frequency waveguide structure disclosed in the foregoing embodiments of the present invention is merely illustrative, and is not the only way to implement the technical features of the present invention, and is not intended to limit the scope of the present invention.

10. . . Dual frequency waveguide

20. . . External waveguide

20a. . . Open end

20b. . . Closed end

20c. . . First guided space

twenty two. . . Set wave department

22a. . . M

22b. . . First annular guide

22c. . . Second annular guide

twenty four. . . Tube body

24a. . . Open end

24b. . . Center perforation

24c. . . Closed end

24d. . . The inner surface

26. . . Horizontally polarized probe

28. . . Vertically polarized probe

29. . . Pedestal

30. . . Inner waveguide

30a. . . Second guided wave space

32. . . Tube body

34. . . Dielectric material guide

34a. . . Outer end

34a1. . . Central cone

34a2. . . Ring

34a3. . . Annular groove

34b. . . Inner end

34b1. . . Central cone

34b2. . . Ring

34b3. . . Annular groove

34b4. . . M

36. . . Base

36a. . . Housing space

36b. . . Reflective surface

36c. . . Flange

36d. . . Arc-shaped slot

36e. . . Thread

36f. . . Screw

38, 38’. . . Horizontally polarized probe

40, 40’. . . Vertically polarized probe

42. . . Reflector

44. . . Circuit board

The first figure is a perspective view of a dual frequency waveguide according to a first preferred embodiment of the present invention.

The second figure is a perspective view of another view direction of the dual-frequency waveguide provided by the first preferred embodiment of the present invention.

The third figure is an exploded perspective view of the dual-frequency waveguide provided by the first preferred embodiment of the present invention.

Figure 4 is a longitudinal cross-sectional view of a dual frequency waveguide according to a first preferred embodiment of the present invention.

Figure 5 is a longitudinal cross-sectional view showing the inner waveguide tube base of the dual-frequency waveguide according to the first preferred embodiment of the present invention.

The sixth figure is a partial end view of the inner waveguide tube base.

Figure 7 is a perspective view of a dual frequency waveguide according to a second preferred embodiment of the present invention.

Figure 8 is a perspective view of a dual-frequency waveguide according to a third preferred embodiment of the present invention.

The ninth figure is a perspective exploded view showing another possible implementation of the inner waveguide tube base.

10. . . Dual frequency waveguide

20. . . External waveguide

20a. . . Open end

20b. . . Closed end

twenty two. . . Set wave department

30. . . Inner waveguide

34. . . Dielectric material guide

Claims (17)

A dual-frequency waveguide includes: an outer feed horn having a first waveguide space and protruding in the first waveguide space and projected in the first waveguide space One of the horizontally polarized probes and one of the vertically polarized probes in a lateral cross section; and an inner feed horn having a tube body disposed at one end of the tube body a dielectric waveguide, a base connected to the other end of the tube, a second waveguide space defined by the dielectric material waveguide, the tube body and the base, and a projection Forming a horizontally polarized probe and a vertically polarized probe perpendicular to each other in a lateral section of the second waveguide space; the base is coupled to the outer waveguide, and at least a portion of the base The tube body and the dielectric material waveguide are coaxial with the first waveguide space, and at least a portion of the tube and the dielectric material waveguide are located in the outer waveguide. The dual frequency waveguide according to claim 1, wherein the outer waveguide is for receiving a first satellite signal, and the inner waveguide is for receiving a second satellite signal, and the second satellite The frequency of the signal is greater than the first satellite signal. The dual frequency waveguide of claim 1, wherein the outer waveguide comprises an open end, a closed end having a central perforation, and between the open end and the closed end The first waveguide space; the base of the inner waveguide is fixed to the closed end, and the tube system of the inner waveguide passes through the center of the closed end and at least a portion is coupled to the first The guided wave space is coaxially located in the first guided waveguide space. The dual-frequency waveguide of claim 3, wherein the base of the inner waveguide has an arc-shaped slot, and the inner waveguide is passed through an arc-shaped slot of the base and The outer waveguide is coupled to the outer waveguide by a fixed end of the closed end. The dual-frequency waveguide according to claim 3, wherein the outer waveguide comprises a wave collecting portion having the open end portion, and a tube body coupled to the wave collecting portion and having the closed end portion. The dual-frequency waveguide according to claim 1, wherein the outer waveguide comprises: a wave collecting portion, and a tubular body having an open end that is coupled to the collecting portion, and a center a closed end of the perforation; the base of the inner waveguide is fixed to the closed end, and the tube system of the inner waveguide passes through the center of the closed end and at least a portion is attached to the outer waveguide The tube body is coaxially located in the tube of the outer waveguide. The dual-frequency waveguide according to claim 6, wherein the concentrating portion comprises a set of fixing rings provided at an open end of the tube fixed to the outer waveguide, and an outer horn facing from the outer circumference of the fixing ring a guiding portion extending in a shape. The dual-frequency waveguide according to claim 6, wherein the concentrating portion comprises a set of fixing rings provided at an open end of the tube fixed to the outer waveguide, and at least one surrounding the outer circumference of the fixing ring The annular guide. The dual-frequency waveguide of claim 7 or 8, wherein at least a portion of the dielectric material waveguide of the inner waveguide is located in the guiding portion of the concentrating portion. The dual-frequency waveguide according to claim 6, wherein the outer surface of the outer waveguide of the outer waveguide forms a reflecting surface, and the horizontally polarized probe and the vertical polarization of the outer waveguide The probe system protrudes from the tube of the outer waveguide, and the distance between the probe and the reflector is 2N+1 times the wavelength of the satellite signal that the outer waveguide is intended to receive. (N is a positive integer). The dual-frequency waveguide of claim 10, wherein the horizontally polarized probes respectively protruding in the body of the outer waveguide are not in the same plane as the vertically polarized probes. The dual-frequency waveguide of claim 1, wherein the base of the inner waveguide has an accommodating space, and coaxially communicates with the inner space of the inner tube of the inner waveguide, and the base is accommodated. The space and the inner space of the inner tube of the inner waveguide form the second guided wave space. The dual-frequency waveguide according to claim 12, wherein the base of the inner waveguide has a reflecting surface at a bottom end of the receiving space, and the horizontally polarized probe and the vertical polarization of the inner waveguide The probes respectively protrude from the accommodating space of the base, and one of the distances from the reflective surface of the base is a quarter wavelength of the satellite signal that the inner waveguide is intended to receive. The dual-frequency waveguide according to claim 13, wherein a reflecting member is further protruded in the accommodating space of the base of the inner waveguide, and the reflecting member is located at the horizontally polarized probe and the vertically polarized probe. The distance between one of the probes and the one of the tubes closer to the inner waveguide is the quarter wavelength of the satellite signal that the inner waveguide is intended to receive. The dual-frequency waveguide according to claim 1, wherein the dielectric material waveguide of the inner waveguide has an outer end portion and a tube opposite to the outer end portion and located in the inner waveguide tube The inner end. The dual-frequency waveguide according to claim 15, wherein the outer end portion of the dielectric material waveguide has a central tapered portion, and an annular portion coaxially surrounding the central tapered portion around the central tapered portion And an annular groove between the central cone and the annular portion. The dual-frequency waveguide of claim 16, wherein the inner end of the dielectric material waveguide has a central tapered portion, and a central portion of the inner end portion is coaxially surrounding the inner end portion. An annular portion of the circumference of the central tapered portion, an annular groove between the central tapered portion of the inner end portion and the annular portion, and a coaxial portion surrounding the central tapered portion of the inner end portion a fixing ring around the circumference of the annular portion of the portion, the fixing ring being plugged in the tube body of the inner waveguide.