CN213905562U - Cavity duplexer with additional zero point introduced - Google Patents
Cavity duplexer with additional zero point introduced Download PDFInfo
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- CN213905562U CN213905562U CN202120214701.0U CN202120214701U CN213905562U CN 213905562 U CN213905562 U CN 213905562U CN 202120214701 U CN202120214701 U CN 202120214701U CN 213905562 U CN213905562 U CN 213905562U
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Abstract
The utility model discloses a cavity duplexer introducing additional zero, including receiving cavity filter, transmission cavity filter and common port, receiving cavity filter and transmission cavity filter all are connected to the common port through input/output line and on traditional coaxial cavity filter basis, introduce additional zero (cross coupling technique) and reasonable overall arrangement to the resonance unit, realize the cavity duplexer in the optimization on indexes such as high selectivity, small-size, high isolation, low insertion loss of L wave band; the miniaturization, low insertion loss and high selectivity of the cavity duplexer are realized by loading a capacitor and introducing an additional zero point, specifically, a capacitive metal column is loaded in a resonant cavity of a direct coupling cavity filter, the length of the resonant cavity can be shortened, so that the miniaturization of the filter is realized, cross coupling is introduced to introduce a transmission zero point at a limited frequency point, the order of the filter is reduced on the premise of ensuring the suppression characteristic of the filter, and the miniaturization of the duplexer is realized.
Description
Technical Field
The utility model relates to a duplexer, concretely relates to introduce cavity duplexer at additional zero point.
Background
In recent years, the fastest growing and most widely used wireless communication technology in the information field is. Its application has been deep into all aspects of people's life and work. Among them, 3G, WLAN, UWB, bluetooth, and broadband satellite systems are the most popular applications of wireless communication technologies in the twenty-first century. Microwave filters, the most technologically sophisticated microwave passive devices, are generally used to separate or integrate signals in different frequency bands. Nowadays, the electromagnetic environment is increasingly complex and the spectrum resources are increasingly crowded, a microwave filter which realizes important functions such as frequency selection, denoising, high out-of-band rejection and the like becomes an important component in a microwave and wireless communication system, is widely applied to a communication system, a radar system and a remote measuring system, and the quality of the system can directly influence the quality of the whole communication system. The duplexer is developed on the basis of a filter, the microwave duplexer is one of important components in a modern communication system, and in a mobile communication system, wireless signals are received and transmitted through an antenna; if an antenna is allocated to each of the receiver and the transmitter, not only the cost and the volume are increased, but also the transmitting and receiving antennas interfere with each other, so that it is desirable to share one antenna for transmitting and receiving. Briefly, a duplexer is a microwave component designed to solve the problem of sharing one antenna for transmitting and receiving, and is generally divided into two types: a transmit-receive switch and a band duplexer. The former is mainly used in the time division multiplexing radar system, and when transmitting, it switches on the antenna and the transmitter, but switches off the receiver; after the pulse is transmitted, the antenna and the receiver are switched on immediately, and the transmitter is switched off; the latter transmits and receives signals of different frequency bands by the same antenna, which can improve reliability in communication system and has more outstanding effect on improving anti-interference and secrecy degree. Therefore, the frequency band duplexer has wider application range and can be used for microwave relay communication, satellite communication, microwave measurement and the like. With the rapid development of microwave technology and the increasing congestion of frequency spectrum, high performance filters and duplexers are becoming more and more important in microwave and wireless communication system applications. The traditional coaxial cavity filter uses a directly coupled cavity filter, and the traditional coaxial cavity filter needs to be continuously optimized on the indexes of high selectivity, small size, low insertion loss in a pass band, low cost and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that it is not high to solve traditional coaxial cavity filter selectivity, the size is great, the higher scheduling problem of insertion loss in the passband, aim at provides an introduce the cavity duplexer at additional zero point, through introducing annex zero point (cross coupling technique) and to the reasonable overall arrangement of resonance unit, realize that the cavity duplexer optimizes at indexes such as high selectivity, small-size, high isolation, the low insertion loss of L wave band.
The utility model discloses a following technical scheme realizes:
a cavity duplexer for introducing additional zero point comprises a receiving cavity filter, a transmitting cavity filter and a common port, wherein the receiving cavity filter and the transmitting cavity filter are connected to the common port through input and output lines, the cavity duplexer also comprises a receiving coupling screw, a transmitting coupling screw, a capacitive coupling probe and an inductive coupling adjusting screw, wherein,
the receiving cavity filter comprises a first receiving resonant unit, a second receiving resonant unit, a third receiving resonant unit, a fourth receiving resonant unit and a fifth receiving resonant unit which are sequentially connected in a cross mode, wherein each receiving resonant unit comprises a receiving resonant cavity, the receiving resonant cavities of each receiving resonant unit are connected with one another through receiving coupling screws, and the cross parts of the receiving resonant cavities of two adjacent receiving resonant units form a coupling structure;
the transmitting cavity filter comprises a first transmitting resonant unit, a second transmitting resonant unit, a third transmitting resonant unit, a fourth transmitting resonant unit and a fifth transmitting resonant unit which are sequentially connected in a cross mode, wherein each transmitting resonant unit comprises a transmitting resonant cavity, the transmitting resonant cavities of each transmitting resonant unit are mutually connected through a transmitting coupling screw, and the cross parts of the transmitting resonant cavities of two adjacent transmitting resonant units form a coupling structure;
the capacitive coupling probe is arranged between the receiving resonant cavity of the second receiving resonant unit and the receiving resonant cavity of the fourth receiving resonant unit, and the inductive coupling adjusting screw is arranged between the transmitting resonant cavity of the second transmitting resonant unit and the transmitting resonant cavity of the fourth transmitting resonant unit.
The traditional coaxial cavity filter uses a directly coupled cavity filter, the scheme is that a cross coupling technology is introduced on the basis of the traditional coaxial cavity filter, a limited transmission zero point is generated in a stop band, the out-of-band rejection of the filter is improved, the order of the filter is reduced, the resonance point of each resonance unit in each cavity is adjusted by the receiving cavity filter and the transmitting cavity filter through respective tuning screws, the coupling quantity between the resonance units is adjusted through the coupling screws on a coupling structure, the coupling screws have a direct coupling effect on adjacent resonance cavities, the more the coupling part of each coupling screw is deep into the cavity is, the larger the coupling quantity is, and the wider the bandwidth of the corresponding cavity filter is; a capacitive coupling probe is arranged between a receiving resonant cavity of a second receiving resonant unit and a receiving resonant cavity of a fourth receiving resonant unit which are not adjacent to each other of the receiving cavity filter, additional electric coupling is introduced, a transmission zero point can be generated at a low frequency position to inhibit a transmitted signal, the electric coupling quantity is adjusted by adjusting the height of the capacitive coupling probe from the bottom of the receiving cavity, the radius of resonant rod cylinders at two sides of the probe and the length of the probe, the higher the height from the bottom of the receiving cavity, the larger the radius of the resonant rod cylinders at two sides of the probe and the longer the length of the probe, the larger the additional electric coupling quantity, the closer the transmission zero point is to a pass band, and the farther the transmission zero point is from the pass band; an inductive coupling adjusting screw is arranged between the transmitting resonant cavity of the second transmitting resonant unit and the transmitting resonant cavity of the fourth transmitting resonant unit which are not adjacent to the transmitting cavity filter, additional magnetic coupling is introduced, a transmission zero point can be generated at a high frequency position to inhibit received signals, the magnetic coupling amount is adjusted by adjusting the depth of the inductive coupling adjusting screw penetrating into the transmitting cavity, the more the inductive coupling adjusting screw penetrates, the larger the additional magnetic coupling amount is, the closer the transmission zero point is to the pass band, and otherwise, the transmission zero point is far away from the pass band. Therefore, a transmission zero is respectively introduced into the two cavity filters, so that the cavity filters are further optimized in the aspects of high-frequency selection, low insertion loss and high isolation characteristics.
Furthermore, the first receiving resonance unit and the second receiving resonance unit are respectively symmetrical with the fifth receiving resonance unit and the fourth receiving resonance unit along the axial extension line of the third receiving resonance unit, the first transmitting resonance unit and the second transmitting resonance unit are respectively symmetrical with the fifth transmitting resonance unit and the fourth transmitting resonance unit along the axial extension line of the third transmitting resonance unit, the first receiving resonance unit and the first transmitting resonance unit are both connected with a public port, the fifth receiving resonance unit is close to the fifth transmitting resonance unit, and the miniaturization of the cavity duplexer is realized through the reasonable layout of the resonance units in the cavities of the receiving cavity filter and the receiving cavity filter.
Furthermore, the filter also comprises a probe supporting medium, wherein the probe supporting medium is used for supporting and fixing the capacitive coupling probe, the size and the dielectric material of the probe supporting medium can be changed, and the influence on the performance of the filter is small.
Further, the larger the resonant cavity is, the higher the Q value of the corresponding cavity filter is, the larger the borne power is, the larger the sizes of the receiving resonant cavity and the transmitting resonant cavity are matched with the size of the cavity duplexer, that is, the sizes of the receiving resonant cavity and the transmitting resonant cavity are selected according to the size requirement of the cavity duplexer.
Furthermore, each receiving resonance unit comprises a receiving resonance rod and a receiving tuning screw, the receiving resonance rod is positioned in the receiving resonance cavity, a receiving disc with a hole in the middle is arranged at the top end of the receiving resonance rod, and the receiving tuning screw passes through the hole of the receiving disc and is arranged on the receiving resonance rod; every transmission resonance unit all includes transmission resonance pole, transmission tuning screw, the transmission resonance pole is located the transmission resonant cavity, the transmission resonant pole top is equipped with the transmission disc that opens the hole in the middle, the transmission tuning screw passes on the transmission resonance pole is located to the hole of transmission disc, and 5 receiving resonance cavity that receive resonance unit corresponds and the receiving resonance pole that corresponds form corresponding resonance point, and the transmission resonant cavity that 5 transmitting resonance unit correspond and the transmission resonance pole that corresponds form corresponding resonance point, and the resonance frequency of resonance unit separately can be adjusted to the tuning screw of receipt and transmission, and the part that the tuning screw deepened the resonance pole is more, and the resonance frequency point that corresponds the resonance unit just moves toward the low frequency more.
Furthermore, the receiving resonant rods of each receiving resonant unit are consistent in size and height, and the transmitting resonant rods of each transmitting resonant unit are consistent in size and height, so that the processing is easy.
Further, the height of each receiving resonance unit receiving resonance rod is consistent with that of each transmitting resonance unit transmitting resonance rod, and the processing is easy.
Furthermore, the diameter of the transmitting disk is larger than that of the receiving disk, because the transmitting frequency band of the transmitting filter is lower than that of the receiving frequency band of the receiving filter, one ends of the resonant rods are grounded, and the other ends of the resonant rods are subjected to capacitance loading through the disk part at the top of the resonant rods, the height of the resonant rods is shortened, the height of the resonant rods can be reduced through the capacitance loading, the size of the cavity filter is reduced, and therefore the miniaturization of the filter is achieved.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
the utility model relates to a cavity duplexer of introducing additional zero point, on the basis of traditional coaxial cavity wave filter, introduce additional zero point (cross coupling technique) and reasonable overall arrangement to the resonance unit, realize the cavity duplexer in the optimization on indexes such as high selectivity, small-size, high isolation, low insertion loss of L wave band; the miniaturization, low insertion loss and high selectivity of the cavity duplexer are realized by loading a capacitor and introducing an additional zero point, specifically, a capacitive metal column is loaded in a resonant cavity of a direct coupling cavity filter, the length of the resonant cavity can be shortened, so that the miniaturization of the filter is realized, cross coupling is introduced to introduce a transmission zero point at a limited frequency point, the order of the filter is reduced on the premise of ensuring the suppression characteristic of the filter, and the miniaturization of the duplexer is realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a top view of the present invention;
FIG. 3 is a simulation curve of S-parameters of the receiving section;
fig. 4 is a simulation curve of the S-parameter of the transmitting part.
Reference numbers and corresponding part names in the drawings:
11-a first receiving resonance unit, 110-a receiving resonance cavity, 111-a receiving disc, 112-a receiving tuning screw, 12-a second receiving resonance unit, 13-a third receiving resonance unit, 14-a fourth receiving resonance unit, 15-a fifth receiving resonance unit, 21-a first transmitting resonance unit, 210-a transmitting resonance cavity, 211-a transmitting disc, 212-a transmitting tuning screw, 22-a second transmitting resonance unit, 23-a third transmitting resonance unit, 24-a fourth transmitting resonance unit, 25-a fifth transmitting resonance unit, 3-a common port, 4-a receiving coupling screw, 5-a transmitting coupling screw, 6-a capacitive coupling probe, 7-a probe supporting medium, 8-an inductive coupling adjusting screw.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the present invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, the terms "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the scope of the present invention.
Example 1
As shown in fig. 1 and fig. 2, the cavity duplexer introduced with an additional zero in embodiment 1 includes a receiving cavity filter, a transmitting cavity filter, a common port, a receiving coupling screw 4, a transmitting coupling screw 5, a capacitive coupling probe 6, and an inductive coupling adjusting screw 8, where,
the receiving cavity filter comprises a first receiving resonant unit 11, a second receiving resonant unit 12, a third receiving resonant unit 13, a fourth receiving resonant unit 14 and a fifth receiving resonant unit 15 which are sequentially connected in a cross mode through a coupling structure, wherein each receiving resonant unit comprises a receiving resonant cavity 110, the receiving resonant cavities of each receiving resonant unit are connected with one another through receiving coupling screws 4, and the cross parts of the receiving resonant cavities of two adjacent receiving resonant units form the coupling structure;
the transmitting cavity filter comprises a first transmitting resonant unit 21, a second transmitting resonant unit 22, a third transmitting resonant unit 23, a fourth transmitting resonant unit 24 and a fifth transmitting resonant unit 25 which are sequentially connected in a cross mode through a coupling structure, wherein each transmitting resonant unit comprises a transmitting resonant cavity, the transmitting resonant cavities of each transmitting resonant unit are connected with one another through transmitting coupling screws 5, and the cross parts of the transmitting resonant cavities of two adjacent transmitting resonant units form the coupling structure;
the capacitive coupling probe 6 is arranged between the receiving resonant cavity of the second receiving resonant unit 12 and the receiving resonant cavity of the fourth receiving resonant unit 14, and the inductive coupling adjusting screw 8 is arranged between the transmitting resonant cavity of the second transmitting resonant unit 22 and the transmitting resonant cavity of the fourth transmitting resonant unit 24.
The first receiving resonant unit 11 and the second receiving resonant unit 12 are respectively symmetrical to the fifth receiving resonant unit 15 and the fourth receiving resonant unit 14 along the axial extension line of the third receiving resonant unit 13, the first transmitting resonant unit 21 and the second transmitting resonant unit 22 are respectively symmetrical to the fifth transmitting resonant unit 25 and the fourth transmitting resonant unit 24 along the axial extension line of the third transmitting resonant unit 23, the first receiving resonant unit 11 and the first transmitting resonant unit 21 are both connected to the common port 3, the fifth receiving resonant unit 15 is close to the fifth transmitting resonant unit 25, and the cavity duplexer is miniaturized by reasonably arranging the resonant units in the cavities of the receiving cavity filter and the receiving cavity filter.
The filter further comprises a probe supporting medium 7, the probe supporting medium 7 is used for supporting and fixing the capacitive coupling probe 6, the size and the medium material of the probe supporting medium can be changed, and the influence on the performance of the filter is small.
The larger the resonant cavity is, the higher the Q value of the corresponding cavity filter is, the higher the borne power is, and the sizes of the receiving resonant cavity and the transmitting resonant cavity are selected according to the volume requirement of the cavity duplexer.
Each receiving resonance unit comprises a receiving resonance rod and a receiving tuning screw 112, the receiving resonance rod is positioned in the receiving resonance cavity 110, the top end of the receiving resonance rod is provided with a receiving disc 111 with a hole in the middle, and the receiving tuning screw 112 penetrates through the hole of the receiving disc 111 and is arranged on the receiving resonance rod; each transmitting resonance unit comprises a transmitting resonance rod and a transmitting tuning screw 212, the transmitting resonance rod is positioned in the transmitting resonance cavity 210, a transmitting disc 211 with a hole in the middle is arranged at the top end of the transmitting resonance rod, the transmitting tuning screw 212 penetrates through the hole of the transmitting disc 211 and is arranged on the transmitting resonance rod, the receiving resonance cavities corresponding to 5 receiving resonance units and the corresponding receiving resonance rods form corresponding resonance points, the transmitting resonance cavities corresponding to 5 transmitting resonance units and the corresponding transmitting resonance rods form corresponding resonance points, the receiving and transmitting tuning screws can respectively adjust the resonance frequency of the respective resonance units, the more the tuning screws penetrate into the resonance rods, the more the resonance frequency points of the corresponding resonance units move towards low frequency.
The receiving resonant rods of the 5 receiving resonant units are all identical in size and height, and the transmitting resonant rods of the 5 transmitting resonant units are all identical in size and height, so that the processing is easy. The height of each receiving resonance unit receiving resonance rod is consistent with that of each transmitting resonance unit transmitting resonance rod, and the processing is easy. The diameter of the transmitting disc 211 is larger than that of the receiving disc 111, because the transmitting frequency band of the transmitting filter is lower than that of the receiving frequency band of the receiving filter, one ends of the resonant rods are grounded, and the other ends of the resonant rods are loaded with capacitance through the disc part at the top of the resonant rods, so that the height of the resonant rods is shortened, the height of the resonant rods can be reduced through the loading of the capacitance, the size of the cavity filter is reduced, and the miniaturization of the filter is realized.
The traditional coaxial cavity filter uses a directly coupled cavity filter, the scheme is that a cross coupling technology is introduced on the basis of the traditional coaxial cavity filter, a limited transmission zero point is generated in a stop band, the out-of-band rejection of the filter is improved, the order of the filter is reduced, the resonance point of each resonance unit in each cavity is adjusted by the receiving cavity filter and the transmitting cavity filter through respective tuning screws, the coupling quantity between the resonance units is adjusted through the coupling screws on a coupling structure, the coupling screws have a direct coupling effect on adjacent resonance cavities, the more the coupling part of each coupling screw is deep into the cavity is, the larger the coupling quantity is, and the wider the bandwidth of the corresponding cavity filter is; a capacitive coupling probe is arranged between the receiving resonant cavity 2 of the non-adjacent receiving resonant unit of the receiving cavity filter and the receiving resonant cavity of the fourth receiving resonant unit, additional electric coupling is introduced, a transmission zero point can be generated at a low frequency position to inhibit a transmitted signal, the electric coupling quantity is adjusted by adjusting the height of the capacitive coupling probe from the bottom of the receiving cavity, the radius of the resonant rod cylinders at two sides of the probe and the length of the probe, the higher the height from the bottom of the receiving cavity, the larger the radius of the resonant rod cylinders at two sides of the probe and the longer the length of the probe, the larger the additional electric coupling quantity, the closer the transmission zero point is to a pass band, and the farther the pass band is vice versa; an inductive coupling adjusting screw is arranged between the transmitting resonant cavity of the second transmitting resonant unit and the transmitting resonant cavity of the fourth transmitting resonant unit which are not adjacent to the transmitting cavity filter, additional magnetic coupling is introduced, a transmission zero point can be generated at a high frequency position to inhibit received signals, the magnetic coupling amount is adjusted by adjusting the depth of the inductive coupling adjusting screw penetrating into the transmitting cavity, the more the inductive coupling adjusting screw penetrates, the larger the additional magnetic coupling amount is, the closer the transmission zero point is to the pass band, and otherwise, the transmission zero point is far away from the pass band. Therefore, a transmission zero is respectively introduced into the two cavity filters, so that the cavity filters are further optimized in the aspects of high-frequency selection, low insertion loss and high isolation characteristics.
The frequencies of a receiving cavity filter and a transmitting cavity filter of the cavity duplexer are respectively determined by the heights of a resonant cavity and a resonant rod respectively, in order to realize the miniaturization of the cavity duplexer, a disc at the top end of the resonant rod adopts a capacitance loading mode, the radius of the disc is larger, the loaded capacitance value is larger, the resonant frequency is jointly determined by the height of the resonant cavity, the radius of the disc at the height of the resonant rod and the radius of the disc at the top end of the resonant rod, and a tuning screw is required to be added to adjust the resonant frequency of each resonant unit according to the height of the tuning screw penetrating into the cavity, so that the height of an input/output tap can be calculated by required group delay, namely the height of an input/output silvered wire connected to the resonant rods of the first receiving resonant unit, the fifth receiving resonant unit, the first transmitting resonant unit and the fifth transmitting resonant unit, the higher the height is, namely the closer to the top of the resonance rod is, the larger the direct coupling is, the smaller the group delay is, otherwise, the larger the direct coupling is, and the required cavity filter can be obtained after the tuning screw and the coupling screw are added for fine tuning.
It can be understood that, in this embodiment, the cavity duplexer implements miniaturization, low insertion loss, and high selectivity of the cavity duplexer by loading a capacitor and introducing an additional zero, specifically, by loading a capacitive metal pillar in a resonant cavity of a directly coupled cavity filter, the length of the resonant cavity can be reduced, thereby implementing miniaturization of the filter, and introducing cross coupling to introduce a transmission zero at a limited frequency point, thereby reducing the order of the filter and implementing miniaturization of the duplexer on the premise of ensuring the suppression characteristics of the filter.
Example 2
The difference between this embodiment and embodiment 1 lies in that, the cavity duplexer of the present invention is applied to a communication transceiving system, the cavity duplexer works at the front end of a radio frequency signal, and is connected to an antenna, after a signal received from the antenna is processed by a receiving filter to filter out an interference signal, the signal is amplified by a low noise amplifier, and after down-conversion is performed by a mixer, a converted intermediate frequency received signal is sent to an intermediate frequency processing end, which is opposite to a received signal processing process, an intermediate frequency transmitting signal from the intermediate frequency processing end is converted to a radio frequency signal by an up-conversion mixer, and the radio frequency signal is power-amplified by a high power amplifier, however, a signal output by the high power amplifier contains various interference signals, which must be filtered out by a transmitting filter and then transmitted by the antenna, a basic function of the transmitting filter is to reduce stray radiation signals from the transmitting end to avoid interference to other wireless communication systems, the main components of these useless signals are the second and third harmonics of the transmitted signal frequency and the image frequency generated during frequency conversion, and the second is to attenuate the noise in the receiving frequency band in the transmitted signal and suppress it below the sensitivity of the receiver. The transmit filter must therefore maintain a wide stop band to suppress spurious signals while maintaining low in-band insertion loss and handling large signal levels at the output. The basic functions of the receive filter are to avoid interference to the receiver due to leakage of the output signal from the transmit side and to reduce power leakage from the local oscillator of the antenna. The best performance of the filter includes high attenuation and interference removal.
The common end of the cavity duplexer is directly connected with the antenna, the common end connects the transmitting filter with the receiving filter by using a matched transmission line, so that the antenna can be freely switched between a transmitting port and a receiving port, communication channels can be freely selected, the using number of the antenna is reduced, and mutual interference between the transmitting antenna and the receiving antenna is avoided.
The utility model discloses introduce the cross coupling technique on the basis of traditional coaxial cavity filter, produce limited transmission zero point at the stop band, improve the outband suppression of wave filter and reduce the order of wave filter, the same with the waveguide duplexer, the electromagnetic field is whole to be sealed in coaxial cavity among the resonant circuit, does not have radiation loss. If air is used as a medium and the surfaces of the coaxial inner and outer conductors are plated with silver, the dielectric loss and the ohmic loss are small. The no-load quality factor can reach thousands, the cavity has good passband low insertion loss, the energy loss of signals in transmission can be effectively reduced, and meanwhile, the cavity often has higher power capacity, is not easy to break down, has the advantages of high stability, good shielding property, strong production reproducibility and the like, and is smaller than a waveguide duplexer.
In order to show more directly the utility model discloses a cavity duplexer ' S advantage, fig. 3 has shown this cavity duplexer receiving part ' S S parameter simulation curve, can see from the picture that the receiving frequency band is 1.62-1.68GHz, the passband bandwidth has a transmission zero for the low side of 60MHz, it is greater than 75dB to transmit frequency band suppression, fig. 4 has shown transmitting part ' S S parameter simulation curve, can see from the picture that the transmitting frequency band is 1.51-1.54GHz, the bandwidth is 30MHz, it has a transmission zero to lead to the high end, it is greater than 90dB to receive frequency band suppression.
Can see from the above-mentioned description the utility model discloses cavity filter improves on the basis of the coaxial cavity filter of traditional direct coupling, through the electric capacity loading, additional coupling introduces transmission zero point, and to the miniaturization that cavity duplexer was realized to the reasonable overall arrangement of resonance unit, two cavity filters introduce a transmission zero point separately and realize cavity filter's high frequency selection, low insertion loss, high isolation characteristic, can realize current communication system to the requirement of duplexer, can be applied to in ground communication and the satellite communication.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The cavity duplexer with the additional zero introduced comprises a receiving cavity filter, a transmitting cavity filter and a common port, wherein the receiving cavity filter and the transmitting cavity filter are connected to the common port through input and output lines, and is characterized by further comprising a receiving coupling screw (4), a transmitting coupling screw (5), a capacitive coupling probe (6) and an inductive coupling adjusting screw (8), wherein,
the receiving cavity filter comprises a first receiving resonance unit (11), a second receiving resonance unit (12), a third receiving resonance unit (13), a fourth receiving resonance unit (14) and a fifth receiving resonance unit (15) which are sequentially connected in a cross mode, wherein each receiving resonance unit comprises a receiving resonant cavity, the receiving resonant cavities of each receiving resonance unit are connected with one another through receiving coupling screws (4), and the cross parts of the receiving resonant cavities of two adjacent receiving resonance units form a coupling structure;
the transmitting cavity filter comprises a first transmitting resonant unit (21), a second transmitting resonant unit (22), a third transmitting resonant unit (23), a fourth transmitting resonant unit (24) and a fifth transmitting resonant unit (25) which are sequentially connected in a cross mode, wherein each transmitting resonant unit comprises a transmitting resonant cavity, the transmitting resonant cavities of each transmitting resonant unit are mutually connected through a transmitting coupling screw (5), and the cross parts of the transmitting resonant cavities of two adjacent transmitting resonant units form a coupling structure;
the capacitive coupling probe (6) is arranged between the receiving resonant cavity of the second receiving resonant unit (12) and the receiving resonant cavity of the fourth receiving resonant unit (14), and the inductive coupling adjusting screw (8) is arranged between the transmitting resonant cavity of the second transmitting resonant unit (22) and the transmitting resonant cavity of the fourth transmitting resonant unit (24).
2. The cavity duplexer with the additional zero introduced according to claim 1, wherein the first receiving resonant unit (11), the second receiving resonant unit (12), the fifth receiving resonant unit (15), and the fourth receiving resonant unit (14) are respectively symmetric with the fifth receiving resonant unit (15) and the fourth receiving resonant unit (14) along an axial extension line of the third receiving resonant unit (13), the first transmitting resonant unit (21), the second transmitting resonant unit (22), the fifth transmitting resonant unit (25), and the fourth transmitting resonant unit (24) are respectively symmetric with an axial extension line of the third transmitting resonant unit (23), the first receiving resonant unit (11) and the first transmitting resonant unit (21) are both connected to the common port (3), and the fifth receiving resonant unit (15) is close to the fifth transmitting resonant unit (25).
3. The cavity duplexer with the introduction of additional zeros as recited in claim 1, further comprising a probe supporting medium (7), wherein the probe supporting medium (7) is used for supporting and fixing the capacitive coupling probe (6).
4. The cavity duplexer with the introduction of the additional zero point, according to claim 1, wherein the sizes of the receiving resonant cavity and the transmitting resonant cavity are matched with the size of the volume of the cavity duplexer.
5. The cavity duplexer with the introduction of the additional zero point, according to claim 1, wherein each receiving resonant unit comprises a receiving resonant rod and a receiving tuning screw, the receiving resonant rod is located in the receiving resonant cavity, a receiving disc with a hole in the middle is arranged at the top end of the receiving resonant rod, and the receiving tuning screw is arranged on the receiving resonant rod through the hole of the receiving disc; each transmitting resonance unit comprises a transmitting resonance rod and a transmitting tuning screw, the transmitting resonance rod is located in the transmitting resonance cavity, a transmitting disc with a hole in the middle is arranged at the top end of the transmitting resonance rod, and the transmitting tuning screw penetrates through the hole of the transmitting disc and is arranged on the transmitting resonance rod.
6. The cavity duplexer with the additional zero introduced according to claim 5, wherein the receiving resonant rods of each receiving resonant unit have the same height and size as each other, and the transmitting resonant rods of each transmitting resonant unit have the same height and size as each other.
7. The cavity duplexer with the introduced additional zero point, according to claim 5, wherein the height of each receiving resonant unit receiving resonant rod is identical to the height of each transmitting resonant unit transmitting resonant rod.
8. The cavity duplexer incorporating an additional zero point, according to claim 5, wherein the transmitting disk diameter is larger than the receiving disk diameter.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115714247A (en) * | 2022-11-23 | 2023-02-24 | 中国电子科技集团公司第二十六研究所 | Miniaturized high-rectangular cavity filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115714247A (en) * | 2022-11-23 | 2023-02-24 | 中国电子科技集团公司第二十六研究所 | Miniaturized high-rectangular cavity filter |
| CN115714247B (en) * | 2022-11-23 | 2024-04-12 | 中国电子科技集团公司第二十六研究所 | Miniaturized high-rectangular cavity filter |
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