CN105141276A - Directional broadband efficient surface wave excitation device - Google Patents
Directional broadband efficient surface wave excitation device Download PDFInfo
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Abstract
The invention provides a directional broadband efficient surface wave excitation device. The directional broadband efficient surface wave excitation device comprises an input matching section, an excitation section and a cover plate, wherein the input matching section comprises a coaxial connector, a coaxial-ridge waveguide switch and a ridge waveguide-waveguide switch; the excitation section comprises a downwards excitation section and an upwards excitation section. Non-contact between an inner core of the coaxial connector and the single ridge waveguide can be realized by opening a pore on a ridge of the single ridge waveguide. The excitation section adopts a two-stage structure to realize the broadband efficient surface wave excitation. Compared with the existing excitation device, the excitation device provided by the invention obviously improves the bandwidth performance and excitation efficiency, and can flexibly move on the surface of the surface wave and enhance the flexibility of application. The directional broadband efficient surface wave excitation device provided by the invention is wide in frequency band, high in surface wave excitation efficiency, compact in structure, easy in processing and low in cost; a surface wave wireless transmission system is formed by the directional broadband efficient surface wave excitation device and the surface of the surface wave, so that the excitation device can flexibly access and remove from the surface of the surface wave, thus the wireless fast transmission application requirement for high speed big data by the millimeter wave frequency band in the future can be satisfied.
Description
Technical field
The present invention relates to a kind of directed broadband high-efficiency surface wave exciting bank, belong to high-speed radiocommunication and interconnection technique field.
Background technology
1907, Zenneck utilized Maxwell equation inference to go out the solution expression formula of surface wave, demonstrates the existence of surface wave in theory.Zenneck surface wave (be called for short " surface wave ") has following four unique characteristics:
Saving power: transmit relative to the three-dimensional sphere of space wave, surface wave is two dimensional surface transmission, and therefore surface wave power is with 1/r instead of 1/r
2ratio decay, reduce power demand, this is very important at millimeter wave frequency band;
Electro Magnetic Compatibility is good: the electric field exponential damping in vertical surface direction, illustrates unique non-radiative characteristic, avoids less desirable monitoring and interference, also can not disturb other link (for 60GHz,
the height that electric field is corresponding is only several millimeter);
Non-visual transmission: surface wave is close to body surface and is transmitted, and illustrates wave-guiding characteristic, allows the transmission in not visible path become possibility.In these situations, traditional wireless technology is faced with predicament;
Reliability is high: surface wave passage is reliable communication port, relative to the single point failure that the connector in wired network link or cable cause, although surface occurs to damage rear a part of surface wave be converted into space wave, cause loss, but, if reserve certain surplus when link budget, communication link would not interrupt, and can at the convenient time keep in repair.
The above-mentioned characteristic of surface wave makes it have saving power, multi-point and non line-of-sight communication, Electro Magnetic Compatibility is good (to be difficult to detect receipts, multi-path influence is little), there is the advantage such as larger flexibility and higher reliability, in recent years, these unique properties of surface wave cause the broad interest of many scholars, many application systems based on surface wave are as wireless human body Local Area Network, the wireless entertainment system of airline carriers of passengers, short distance broadband wireless data transmission network, wireless local multi-CPU wireless internet network, the health monitoring of platform, surface wave sea communication system, surface wave radar system and surface wave antenna are proposed successively.
But as the critical component in surface wave wireless communication system, exciting bank is mainly divided into two types: a class is the surface wave exciting bank of omnidirectional, a class is directed surface wave exciting bank.Wherein, the simple driving source such as the main employing end-fire lap gating system/dipole/monopole of omnidirectional carrys out excitation table ground roll, the narrow-band characteristic in gap/dipole/monopole equal excitation source limits its extensive use, needs research to have omnidirectional's surface wave driving source of broadband character.For the exciting bank of Equations of The Second Kind orientation, document [1] (Turner, J., Jessup, M., Tong, K.-F., " ANovelTechniqueEnablingtheRealisationof60GHzBodyAreaNetw orks; " 2012NinthInt.Conf.WearableandImplantableBodySensorNetwor ks (BSN), pp.58 – 62, May2012.) adopt ripple to carry out the wireless transmission transmission experiment of surface wave as driving source with conversion, due to the bore of waveguide coaxial connecter and non-optimal, the efficiency therefore encouraged is lower.In addition, this exciting bank in surface wave movement flexibly on the surface, therefore cannot cannot meet actual mobile terminal to the requirement used, only can as the testing apparatus of surface wave performance.Document [2] [3] ([2] A.F.KayandF.J.Zucker " Efficiencyofsurfacewaveexcitation ", 1955IREConventionRecord, 21-25March1955, vol.3, NewYork, NY, USA, PP.1 ~ 5.[3] G.J.Rich, " TheLaunchingofaPlaneSurfaceWave ", ProceedingsoftheIEE-PartB:RadioandElectronicEngineering, Volume102, Issue2, March1955, PP.237 – 246.) adopt loudspeaker as directed exciting bank, only using the experimental provision of loudspeaker as narrowband excitation surface wave in literary composition, broadband character is not analyzed, owing to adopting the single bore of coaxial-waveguide feed to carry out excitation table ground roll, therefore its excitation bandwidth should about 2:1 octave.In addition, this exciting bank also exists and the mechanical Coupling Design in reactance surface, is not easy to the shortcomings such as flexible Application.To sum up, the research of existing surface wave exciting bank is also not enough to support above-mentioned application demand, lack wide band, high efficiency surface wave exciting bank, and emphasis of the present invention proposes a kind of novel directed broadband high-efficiency surface wave exciting bank.
Summary of the invention
Technology of the present invention is dealt with problems: overcome the deficiencies in the prior art, according to surface wave application characteristic, proposes a kind of novel directed broadband high-efficiency surface wave exciting bank, and achieves in surface wave movement flexibly on the surface, enhance the flexibility of application.This exciting bank can with surface wave surface composition surface wave wireless transmitting system, the wireless fast transport application demand of following millimeter wave frequency band at a high speed large data can be met.
Technical solution of the present invention is as follows:
A kind of directed broadband high-efficiency surface wave exciting bank, comprising: Input matching section, activation fragment and cover plate, and wherein Input matching section comprises coaxial connector, coaxial-ridge waveguide conversion and ridge waveguide-waveguide transitions; Activation fragment comprises upwards activation fragment and downward activation fragment;
Coaxial-ridge waveguide conversion adopts single ridged waveguides form, perforate on the ridge of coaxial-ridge waveguide conversion, coaxial connector is fixed in coaxial-ridge waveguide conversion, and the probe of coaxial connector inserts the hole on coaxial-ridge waveguide conversion ridge, forms the contactless feed of the single ridge in broadband;
One end of ridge waveguide-waveguide transitions is connected with coaxial-ridge waveguide conversion, realize the broadband transition from ridge waveguide to waveguide, the other end of ridge waveguide-waveguide transitions connects upwards activation fragment, and upwards the guide floor of activation fragment is opened downwards gradually, realizes zero elevation feed at the end of upwards activation fragment; Coaxial-ridge waveguide conversion, ridge waveguide-waveguide transitions and upwards activation fragment is one-body molded, cover plate is fixed on top, changes, ridge waveguide-waveguide transitions forms Electromagnetic Wave Propagation path together with upwards activation fragment with coaxial-ridge waveguide; Downward activation fragment is the second segment upwards opened upwards increased after activation fragment, and the described second segment upwards opened is directly using surface wave surface as bottom surface.
Described coaxial-ridge waveguide conversion adopts single ridged waveguides form, the width of coaxial-ridge waveguide conversion ridge is between 1.1 ~ 1.5mm, height is between 1.05 ~ 1.35mm, the bottom that the end of probe distance coaxial-ridge waveguide of coaxial connector is changed is 0.2 ~ 0.5mm, the short circuit face that probe distance coaxial-ridge waveguide is changed is 1.20 ~ 1.25mm, ridge between the short circuit face of coaxial-ridge waveguide conversion and the probe of coaxial connector, adopts the mode of ladder transition.
Ladder transition comprises two-stage, and the height of first order ladder is 0.1 ~ 0.3mm, and the height of second level ladder is 0.3 ~ 0.5mm, and length is 0.5 ~ 0.7mm.First order ladder refers to the ladder near short circuit face, and second level ladder refers to the ladder away from short circuit face.Zero elevation feed refers to that waveguide directly carries out feed using surface wave surface as bottom surface.The length of ridge waveguide-waveguide transitions is 30 ~ 34mm, and ridge transition adopts second-degree parabola form.Upwards the length of activation fragment is 3.2 ~ 4mm, is linear transitions.The length of downward activation fragment is 8 ~ 12mm, and subtended angle is 18 ° ~ 21 °.
The present invention compared with prior art beneficial effect is:
(1) orientation surface wave excitation device of the present invention can have higher surface wave launching efficiency in the octave of 5:1, and can with surface wave surface composition surface wave wireless transmitting system, and can access on the surface at surface wave and shift out (as shown in Figure 4) neatly, the wireless fast transport application demand of following millimeter wave frequency band to the large data of high speed can be met.
(2) the contactless feeding classification of single ridge is adopted, while realizing 5:1 octave Broadband Matching, compare traditional two ridge structures, eliminate the sensitive parameters such as two ridge gaps, reduce difficulty of processing, and be easy to the debugging of assembling and performance, and avoid the interference with surface wave surface, there is very high economic worth.This feeding classification also can the broadband feed of applied microwave parts;
(3) adopt the surface wave energisation mode of two-part, first paragraph is the section of opening downwards, meets the requirement of surface wave zero elevation feed, second segment upwards opens, and using surface wave surface as bottom surface, significantly improve the launching efficiency of surface wave in broadband, up to 60% in 5:1 octave.In addition, downward activation fragment and ridge waveguide-waveguide transitions integrated design, achieve the miniaturization of structure;
(4) exciting bank and reactance surface separate design, exciting bank can seamless access/shift out surface wave surface flexibly, can meet mobile radio telecommunications to the demand applied.
Accompanying drawing explanation
Fig. 1 is surface wave wireless transmitting system schematic diagram;
Fig. 2 is the structural representation of exciting bank;
Fig. 3 is the generalized section of exciting bank;
Fig. 4 is exciting bank Input matching section mucosal structure schematic diagram;
Fig. 5 is that exciting bank freely accesses on the surface at surface wave and shifts out schematic diagram;
Fig. 6 is the simulation model of surface wave wireless system;
Fig. 7 is the return loss characteristic of exciting bank;
Fig. 8 is the efficiency characteristic of exciting bank;
Fig. 9 is the transmission characteristic of exciting bank.
Embodiment
One of the present invention directed broadband high-efficiency surface wave exciting bank can with surface wave surface composition surface wave wireless transmitting system (as shown in Figure 1), and can access on the surface at surface wave neatly and shift out, the wireless fast transport application demand of following millimeter wave frequency band to the large data of high speed can be met.
Table 1 is depicted as the basic demand of surface wave to exciting bank.
Table 1 (TM) surface wave is to the basic demand of exciting bank
One of the present invention directed broadband high-efficiency surface wave exciting bank, comprise Input matching section a and activation fragment b two funtion parts and a cover plate 6 (as shown in figs. 2 to 4), wherein Input matching section comprises coaxial connector 1, coaxial-ridge waveguide conversion 2 and ridge waveguide-waveguide transitions 3; Activation fragment comprises upwards activation fragment 4 and downward activation fragment 5.This exciting bank, compared with existing exciting bank, significantly improves bandwidth performance and launching efficiency, and achieves the flexible movement (as shown in Figure 5) on surface wave surface, enhances the flexibility of application.
In order to expand bandwidth of operation, adopting ridge waveguide feeding classification, having two-sided pair of ridge contact feed and the two ridge noncontact feed two kinds of forms of one side at present.
The major defect of two-sided pair of ridge contact feeding classification comprises: have employed two ridge and load, difficulty of processing doubles above; Contact feeding classification is not easy to the adjustment of standing-wave ratio; Adopting contact feed, for ensureing the excellent electric contact of feed probes and opposite ridge, usually adopting in this side of ridge modes such as welding, be spirally connected, at millimeter wave frequency band, realize difficulty comparatively large, and do not utilize driving source to contact with the zero elevation on reactance surface.
The major defect of the two contactless feeding classification of ridge of one side comprises: the gap between two ridge is responsive to performance impact; Need processing two vallate, and ridge thickness is about single ridge half, at millimeter wave frequency band, the thickness of ridge is only several millimeter at zero point, and two so thin vallate processing are very difficult.
In order to overcome these shortcomings above-mentioned, the present invention adopts the contactless feeding classification of single ridge (referring to Fig. 3 and Fig. 4).
The exciting bank that the present invention proposes as shown in Figure 3, perforate on the ridge of coaxial-ridge waveguide conversion 2, coaxial connector 1 is fixed in coaxial-ridge waveguide conversion 2, and the probe insertion coaxial-ridge waveguide of coaxial connector 1 changes the hole on 2 ridges, forms the contactless feed of the single ridge in broadband.
One end and the coaxial-ridge waveguide of ridge waveguide-waveguide transitions 3 are changed 2 and are connected, realize the broadband transition from ridge waveguide to waveguide, the other end of ridge waveguide-waveguide transitions 3 connects upwards activation fragment 4, upwards the guide floor of activation fragment 4 is opened downwards gradually, realizes zero elevation feed (zero elevation feed refers to that waveguide directly carries out feed using surface wave surface as bottom surface) at the end of upwards activation fragment 4; Coaxial-ridge waveguide conversion 2, ridge waveguide-waveguide transitions 3 and upwards activation fragment 4 is one-body molded, cover plate 6 is fixed on top, changes 2, ridge waveguide-waveguide transitions 3 forms Electromagnetic Wave Propagation path together with upwards activation fragment 4 with coaxial-ridge waveguide; Downward activation fragment 5 is the second segment upwards opened of the upwards rear increase of activation fragment 4, and the described second segment upwards opened is directly using surface wave surface as bottom surface.
Coaxial-ridge waveguide changes the width of 2 ridges between 1.1 ~ 1.5mm, height is between 1.05 ~ 1.35mm, between the bottom 0.2 ~ 0.5mm of the end of probe distance coaxial-ridge waveguide conversion 2 of coaxial connector 1, between the short circuit face 1.20 ~ 1.25mm of probe distance coaxial-ridge waveguide conversion 2, ridge between the short circuit face of coaxial-ridge waveguide conversion 2 and the probe of coaxial connector 1, adopts the mode of ladder transition; Ladder transition comprises two-stage, and the height of first order ladder is 0.1 ~ 0.3mm, and the height of second level ladder is 0.3 ~ 0.5mm, and length is 0.5 ~ 0.7mm, and first order ladder refers to the ladder near short circuit face, and second level ladder refers to the ladder away from short circuit face.The length of ridge waveguide-waveguide transitions 3 is 30 ~ 34mm, and upwards the length of activation fragment 4 is 3.2 ~ 4mm, and the length of downward activation fragment 5 is 8 ~ 12mm, and subtended angle is 18 ° ~ 21 °.
Exciting bank of the present invention, first loads the bandwidth of operation requirement meeting 5:1 by single ridge.Then, the probe of coaxial connector 1 and the noncontact of ridge waveguide is achieved by perforate on the ridge of coaxial-ridge waveguide conversion 2, form the contactless feed of the single ridge in broadband, and this form feed design is convenient to the processing of probe, the debugging of assembling and standing wave performance, avoids the interference with surface wave surface simultaneously.In order to improve wide band matching performance further, the ridge waveguide changed by coaxial-ridge waveguide near 2 short circuit faces adopts stepped-style, defines an effective wide-band short circuit chamber.Finally, the broadband transition of feed section to activation fragment is achieved by the broadband conversion of ridge waveguide-waveguide transitions 3.In order to the miniaturization of implementation structure, adopt integrated design to the upwards excitation 4 sections of ridge waveguide-waveguide transitions 3 and activation fragment, structure is more compact.Coaxial-ridge waveguide conversion 2, ridge waveguide-waveguide transitions 3 and upwards activation fragment 4 is one-body molded in structural design, cover plate 6 is fixed on top, changes 2, ridge waveguide-waveguide transitions 3 forms Electromagnetic Wave Propagation path together with upwards activation fragment 4 with coaxial-ridge waveguide.
Activation fragment adopts two-part structure (referring to Fig. 3 and Fig. 4), first paragraph upwards activation fragment 4 opens until be close to reactance surface downwards, its function realizes, with the seamless feed of zero elevation on reactance surface, to obtain good surface wave conversion efficiency near center bin; The downward activation fragment 5 of second segment upwards opens, and directly using surface wave surface as bottom surface, thus do not affect the conversion of guided wave to surface wave of center bin, and the reflected wave of lower side frequency can be made again to project surface wave surface, be converted to surface wave further, thus the surface wave launching efficiency that can further improve in broadband, launching efficiency is better than more than 60% in the frequency range of 5:1.
Embodiment:
As shown in Figure 3 and Figure 4, first, the main mould signal of ridge waveguide is become, then further by the main mould signal being converted to waveguide of ridge waveguide-waveguide by the broadband signal of probe feed through coaxial-ridge waveguide conversion.Meanwhile, in order to the miniaturization of implementation structure, by the conversion of ridge waveguide-waveguide and downward activation fragment integrated design, therefore this conversion transits directly to the best surface wave excitation bore needed for centre frequency.Now, the guided wave from the center bin of coaxial interface can be converted to surface wave with higher efficiency.But to upper lower side frequency, this excited aperture is difficult to accomplish the best, in order to expand bandwidth of operation further, turn increase the upwards section of opening, this activation fragment is directly using surface wave surface as bottom surface, and therefore for center bin, upwards activation fragment works hardly.But, for lower side frequency, upwards open Duan Ze and be equivalent to add excited aperture, meet the requirement of lower side frequency to higher excited aperture; For upper side frequency, then space wave part can not being transferred to surface wave reflexes to reactance surface again, thus can improve the launching efficiency of surface wave further.
The Input matching section of exciting bank as shown in Figure 3, primarily of coaxial connector, change by coaxial-ridge waveguide, ridge waveguide-waveguide transitions composition.Wherein coaxial connector adopts the KPC100F311 connector (as shown in the figure) of KMCO company, be 1mm/0.434mm with the coaxial interface of cut cable, be 1.115mm/0.483mm with the coaxial interface of waveguide end, its cut-off frequency 119.5GHz, inner wire is detachable, is convenient to standing wave performance adjustment.
For coaxial-ridge waveguide conversion, as shown in Figure 3 and Figure 4, probe inserts from waveguide broadside center, and the electromagnetic electric field of therefore radiation to be parallel to probe, thus encourages TE10 mould effectively.Near probe, have multiple pattern to exist, therefore waveguide dimensions ensures only main mould transmission usually, effectively can suppress the higher modes such as TE11/TM11/TE30, so select waveguide dimensions to be 4.2mm × 1.5mm, the size that single ridge loads is optimized design by bandwidth requirement.Because probe is equivalent to a miniature antenna, in the waveguide to surrounding emittance.In order to make the energy of TE10 mould only transmit to one end of waveguide, the other end of waveguide of being everlasting is about the position short circuit of λ/4 (1.21mm) apart from probe, ensures that probe is in electric field antinode place in waveguide, realizes the strongest coupling.In order to improve wide band matching performance further, the ridge waveguide near short circuit face being adopted stepped-style, defines an effective wide-band short circuit chamber.By suitably selecting the degree of depth of probe, with the position of road section surface, and the parameter equidimension of ridge waveguide ladder can obtain low return loss coaxial-ridge waveguide switching.After optimization, coaxial-ridge waveguide changes the width of 2 ridges into 1.3mm, and be highly 1.2mm, the height of two-stage ladder is respectively 0.2mm and 0.4mm, and length is 0.6mm.The bottom 0.35mm of the end of probe distance coaxial-ridge waveguide conversion 2 of coaxial connector 1, the short circuit face 1.21mm of probe distance coaxial-ridge waveguide conversion 2.
For ridge waveguide-waveguide transitions 3, as shown in Figure 3 and Figure 4, in order to the size of shortening structure, directly from Ridge Waveguide Transitions to downward activation fragment.Metal ridge can adopt different curves to realize the conversion of ridge waveguide-waveguide, although linear excessively simple, because the ridge height loaded declines very fast, cut-off frequency raises, and does not meet the demands.Final selection second-degree parabola form, transform length 32.4mm.
Activation fragment adopts two-part structure, primarily of downward activation fragment and upwards activation fragment, as shown in Figure 3 and Figure 4, first paragraph is activation fragment 4 and ridge waveguide-waveguide transitions 3 integrated design upwards, downward subtended angle degree is consistent with the lower surface subtended angle of ridge waveguide-waveguide transitions 3, and adopt linear transformation, length is 3.6mm, both be conducive to the distribution of excited aperture field, in turn simplify the requirement to processing.The subtended angle form of the downward activation fragment 5 of second segment, can the difformity such as trade-off curve figuration, to seek best arousal effect.Final optimization pass have selected linear subtended angle, and the length of downward activation fragment 5 is 10mm, and subtended angle is 19.8 °.
As shown in Figure 6, establish surface wave wireless transmitting system model, the return loss emulated, launching efficiency and transmission performance, respectively as shown in Fig. 7,8,9, present broadband and higher efficiency, be about 5:1 octave boundary inner surface wave excitation efficiency at 20 ~ 100GHz and be better than more than 60%, achieve the good excitation from guided wave to surface wave.
Frequency range of the present invention is wide, surface wave launching efficiency is high, compact conformation, be easy to processing, cost is lower.This exciting bank can with surface wave surface composition surface wave wireless transmitting system, can access on the surface at surface wave neatly and shift out, meet broadband (20GHz ~ 100GHz) short-distance wireless communication at a high speed and interconnected application demand.
Exciting bank of the present invention, for can be applied in kinds of surface communi-cation system, particularly promotes and has opened up related application, and the design of other close for application, index is similar band table ground roll exciting bank, has reference.For the application of arrowband, the such as application of 2:1 octave, the form that can directly adopt coaxial-waveguide to change, can save the larger metal ridge of difficulty of processing and ridge waveguide-waveguide transitions 4, thus can implementation structure compacter, simpler high efficiency surface wave exciting bank.
Claims (8)
1. a directed broadband high-efficiency surface wave exciting bank, it is characterized in that comprising: Input matching section, activation fragment and cover plate (6), wherein Input matching section comprises coaxial connector (1), coaxial-ridge waveguide conversion (2) and ridge waveguide-waveguide transitions (3); Activation fragment comprises upwards activation fragment (4) and downward activation fragment (5);
Coaxial-ridge waveguide conversion (2) adopts single ridged waveguides form, perforate on the ridge of coaxial-ridge waveguide conversion (2), coaxial connector (1) is fixed on coaxial-ridge waveguide conversion (2), the probe of coaxial connector (1) inserts the hole on coaxial-ridge waveguide conversion (2) ridge, forms the contactless feed of the single ridge in broadband;
One end of ridge waveguide-waveguide transitions (3) is changed (2) and is connected with coaxial-ridge waveguide, realize the broadband transition from ridge waveguide to waveguide, the other end of ridge waveguide-waveguide transitions (3) connects upwards activation fragment (4), upwards the guide floor of activation fragment (4) is opened downwards gradually, realizes zero elevation feed at the end of upwards activation fragment (4); Coaxial-ridge waveguide changes (2), ridge waveguide-waveguide transitions (3) and upwards activation fragment (4) is one-body molded, cover plate (6) is fixed on top, changes (2), ridge waveguide-waveguide transitions (3) and upwards form Electromagnetic Wave Propagation path together with activation fragment (4) with coaxial-ridge waveguide; Downward activation fragment (5) is the upwards second segment upwards opened that increases afterwards of activation fragment (4), and the described second segment upwards opened is directly using surface wave surface as bottom surface.
2. one according to claim 1 directed broadband high-efficiency surface wave exciting bank, it is characterized in that: the width of coaxial-ridge waveguide conversion (2) ridge is between 1.1 ~ 1.5mm, height is between 1.05 ~ 1.35mm, between the bottom 0.2 ~ 0.5mm of end of probe distance coaxial-ridge waveguide conversion (2) of coaxial connector (1), between the short circuit face 1.20 ~ 1.25mm of probe distance coaxial-ridge waveguide conversion (2), ridge between the short circuit face of coaxial-ridge waveguide conversion (2) and the probe of coaxial connector (1), adopt the mode of ladder transition.
3. one according to claim 2 directed broadband high-efficiency surface wave exciting bank, it is characterized in that: described ladder transition comprises two-stage, the height of first order ladder is 0.1 ~ 0.3mm, and the height of second level ladder is 0.3 ~ 0.5mm, and length is 0.5 ~ 0.7mm.
4. one according to claim 3 directed broadband high-efficiency surface wave exciting bank, is characterized in that: described first order ladder refers to the ladder near short circuit face, and second level ladder refers to the ladder away from short circuit face.
5. one according to claim 1 directed broadband high-efficiency surface wave exciting bank, is characterized in that: described zero elevation feed refers to that waveguide directly carries out feed using surface wave surface as bottom surface.
6. one according to claim 1 directed broadband high-efficiency surface wave exciting bank, is characterized in that: the length of described ridge waveguide-waveguide transitions (3) is 30 ~ 34mm, and ridge transition adopts second-degree parabola form.
7. one according to claim 1 directed broadband high-efficiency surface wave exciting bank, is characterized in that: the length of described upwards activation fragment (4) is 3.2 ~ 4mm, is linear transitions.
8. one according to claim 1 directed broadband high-efficiency surface wave exciting bank, is characterized in that: the length of described downward activation fragment (5) is 8 ~ 12mm, and subtended angle is 18 ° ~ 21 °.
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| CN103516327A (en) * | 2013-09-26 | 2014-01-15 | 西北核技术研究所 | High-power coaxial structure over-mode surface wave oscillator and terahertz wave generating method |
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| CN103516327A (en) * | 2013-09-26 | 2014-01-15 | 西北核技术研究所 | High-power coaxial structure over-mode surface wave oscillator and terahertz wave generating method |
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