WO2002067366A1 - Coupling structure for sma connector-nrd guide - Google Patents

Coupling structure for sma connector-nrd guide Download PDF

Info

Publication number
WO2002067366A1
WO2002067366A1 PCT/KR2002/000196 KR0200196W WO02067366A1 WO 2002067366 A1 WO2002067366 A1 WO 2002067366A1 KR 0200196 W KR0200196 W KR 0200196W WO 02067366 A1 WO02067366 A1 WO 02067366A1
Authority
WO
WIPO (PCT)
Prior art keywords
nrd guide
sma connector
guide
feed line
nrd
Prior art date
Application number
PCT/KR2002/000196
Other languages
French (fr)
Inventor
Cheon Woo Shin
Original Assignee
Nrdtech Co., Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nrdtech Co., Ltd filed Critical Nrdtech Co., Ltd
Publication of WO2002067366A1 publication Critical patent/WO2002067366A1/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
    • H01P5/10—Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced lines or devices with unbalanced lines or devices
    • H01P5/1022—Transitions to dielectric waveguide
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices

Definitions

  • the present invention provides a circuit for the high frequency range over 30GHz or for other desirable frequency ranges by connecting an NRD Guide (Non- Radiative Dielectric waveGuide) and an SMA connector with a feed line in a bridge form and by inserting a mode suppressor in the middle of the NRD Guide in order to suppress unnecessary modes.
  • NRD Guide Non- Radiative Dielectric waveGuide
  • the NRD Guide which is actively researched recently in accordance with the development in the communication equipment, has characteristics of non- radiativeness, lower transmission loss than micro strip lines and easier composition of transmission line and circuit than waveguides. Accordingly, the NRD Guide is attracting interests as a transmission line and a component circuit in the millimeter wave band.
  • MMIC Microwave Monolithic Integrated Circuit
  • the present invention provides a circuit for the high frequency range over 30GHz or for other desirable frequency ranges by connecting an NRD Guide (Non- Radiative Dielectric waveGuide) and an SMA connector with a feed line in a bridge form and by inserting a mode suppressor in the NRD Guide in order to suppress unnecessary modes.
  • NRD Guide Non- Radiative Dielectric waveGuide
  • the preferred embodiment of the present invention is implemented in the frequency range of 10GHz.
  • the present invention may also be implemented in other frequency ranges.
  • Figure 1 illustrates a perspective view of an SMA connector-NRD Guide combination structure according to the first preferred embodiment of the present invention for feeding millimeter waves inputted by the SMA connector to the NRD Guide.
  • Figure 2 illustrates the electromagnetic field distribution of the NRD Guide and the feed line located in between the upper and lower conducting plates.
  • Figure 3 illustrates a cross-sectional view of the structure of Figure 1 cut in the direction of line A- A', which is vertical to the feed line of Figure 1.
  • Figure 4 illustrates a cross-sectional view of the NRD Guide of Figure 1 cut in the direction of line B-B', which is horizontal to the upper and lower conducting plates.
  • Figure 5 illustrates a perspective view of an SMA connector-NRD Guide combination structure according to the second preferred embodiment of the present invention, wherein a mode suppressor is inserted in the middle of the divided NRD Guide of the first preferred embodiment of the present invention.
  • Figure 6 illustrates a cross-sectional view of the structure of Figure 5 cut in the direction of line C-C, which is vertical with the feed line of Figure 5.
  • Figure 7 illustrates a cross-sectional view of the NRD Guide of Figure 5 cut in the direction of line D-D', which is horizontal to the upper and lower conducting plates.
  • Figure 8 illustrates a cross-sectional view of a disassembled mode suppressor which is inserted in the middle of the NRD Guide of Figure 5.
  • Figure 9 is a graph that illustrates the NSWR (Voltage Standing Wave Ratio) characteristic of the SMA connector- ⁇ RD Guide combination structure illustrated in
  • Figure 10 is a graph that illustrates the VSWR characteristic depending on the length (t) of the portion of the feed line, which is inserted into the ⁇ RD Guide.
  • Figure 1 illustrates a perspective view of an SMA connector-NRD Guide combination structure, for inputting microwaves and millimeter waves to an SMA connector (4) and feeding them to an NRD Guide (3).
  • the waves are inputted into the SMA connector (4), are propagated along a feed line (5) which connects the SMA connector (4) and the NRD Guide (3) and, then, are fed to the NRD Guide (3).
  • the fed waves are radiated through a rod antenna (7) after being propagated along the NRD Guide (3).
  • Figure 5 illustrates a perspective view of an SMA connector-NRD Guide combination structure, wherein the feed line (5) is used as illustrated in Figure 1 and a mode suppressor (8) is inserted in the middle of the divided NRD Guide (3) in order to suppress unnecessary modes of the fed waves.
  • Figure 2 illustrates electromagnetic field distribution of the NRD Guide (3) and the feed line(5) located in between the upper and lower conducting plates (1, 2) which maintain the pre-determined distance between them according to a certain frequency.
  • the electromagnetic field in the NRD Guide (3) is represented as LSM mode and LSE mode.
  • the electromagnetic field in the feed line(5) is represented as TE mode and TM mode.
  • the NRD Guide (3) may be connected with the feed line (5).
  • the minimum value of the NSWR (Voltage Standing Wave Ratio) 1.12 may be obtained when it is measured at the frequency range around 10GHz on the following conditions: as illustrated in Figure 3 and Figure 4, the feed line(5) is inserted into the ⁇ RD Guide (3) by the depth of 2mm; the feed line(5) is located 5mm apart from the end of the ⁇ RD Guide in the direction of the line's arrangement; the gap between the upper conducting plate and the lower conducting plate is 12.2mm; the ⁇ RD Guide has the permittivity of 2.56 and the width of 10.5mm; and the diameter of the feed line(5) is 3mm. It is found that the distance from the end of the ⁇ RD Guide (3) (5mm) and the insertion depth of the feed line (5) (t) into the ⁇ RD Guide (3) have meager influence. On the other hand, the feeding efficiency may be improved by adjusting the diameter (w) of the feed line (5).
  • the ⁇ RD Voltage Standing Wave Ratio
  • the mode suppressor (8) has a metal thin film (9) in the shape of a ⁇ /4 choke mounted between thin Teflons (10) as illustrated in Figure 8.
  • the gap between the notches of the metal thin film (9) is 4mm, equivalent to the length of ⁇ /4.
  • wl is 2mm and w2 is 12mm.
  • Figure 9 illustrates NSWR characteristics depending on the distance between the end of the ⁇ RD Guide and the feed line (5), for the respective lengths (t) of the portion of the feed line, which is inserted into the ⁇ RD Guide.
  • the NSWR is generally low when the feed line (5) is located 5mm apart from the end of the ⁇ RD Guide (3).
  • the VSWR characteristic is the best.
  • Figure 10 is a graph that illustrates VSWR characteristic depending on the length (t) of the portion of the feed line(5) inserted into the ⁇ RD Guide. As illustrated in Figure 9, when the length (t) is 2mm, the VSWR is the lowest.
  • the present invention it is made possible to transmit microwaves and waves in the millimeter wave band using the coaxial cable of the related art. Further, it is made possible to transmit waves of a desired frequency with low loss by adjusting the diameter of the feed line, because the smaller the diameter of the feed line, the better effect of suppressing unnecessary modes.

Landscapes

  • Waveguides (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

The present invention is to feed the millimeter wave input from an SMA connector to a non-radiative dielectric waveguide ('NRD guide').The present invention provides a coupling structure of an SMA connector and an NRD guide conversion mode, which uses a semi-rigid in order to propagate millimeter wave or microwave from the SMA connector to the NRD guide, connects the SMA connector and the NRD guide with the semi-rigid and includes a mode suppressor in order to suppress unnecessary modes.

Description

COUPLING STRUCTURE FOR SMA CONNECTOR-NRD GUIDE
TECHNICAL FIELD
The present invention provides a circuit for the high frequency range over 30GHz or for other desirable frequency ranges by connecting an NRD Guide (Non- Radiative Dielectric waveGuide) and an SMA connector with a feed line in a bridge form and by inserting a mode suppressor in the middle of the NRD Guide in order to suppress unnecessary modes.
BACKGROUND ART
In the modern society characterized as the information society, the need for high capacity communication is very strong as there occur frequent computer network experiments and implementations including the high speed data transmission, video conference, etc. In the optical communication field, mass communications have already been put to a practical use by the development of fiber or semiconductor laser. Also, in the wireless communication field, mass communications are made possible by the development of small-sized, light and highly reliable communication equipment used in the band of millimeter waves or quasi-millimeter waves.
The NRD Guide, which is actively researched recently in accordance with the development in the communication equipment, has characteristics of non- radiativeness, lower transmission loss than micro strip lines and easier composition of transmission line and circuit than waveguides. Accordingly, the NRD Guide is attracting interests as a transmission line and a component circuit in the millimeter wave band. However, in the MMIC (Microwave Monolithic Integrated Circuit) method which adopts the general NRD Guide theory, a drastic transmission loss of 60dB per lm is incurred at the usable frequency of 50GHz due to the decrease in the wavelength in the millimeter wave band. Thus, it is difficult to compose a circuit for high frequency using the technique such as the MMIC method.
DISCLOSURE OF THE INVENTION
The present invention provides a circuit for the high frequency range over 30GHz or for other desirable frequency ranges by connecting an NRD Guide (Non- Radiative Dielectric waveGuide) and an SMA connector with a feed line in a bridge form and by inserting a mode suppressor in the NRD Guide in order to suppress unnecessary modes.
The preferred embodiment of the present invention is implemented in the frequency range of 10GHz. The present invention may also be implemented in other frequency ranges.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 illustrates a perspective view of an SMA connector-NRD Guide combination structure according to the first preferred embodiment of the present invention for feeding millimeter waves inputted by the SMA connector to the NRD Guide. Figure 2 illustrates the electromagnetic field distribution of the NRD Guide and the feed line located in between the upper and lower conducting plates.
Figure 3 illustrates a cross-sectional view of the structure of Figure 1 cut in the direction of line A- A', which is vertical to the feed line of Figure 1.
Figure 4 illustrates a cross-sectional view of the NRD Guide of Figure 1 cut in the direction of line B-B', which is horizontal to the upper and lower conducting plates.
Figure 5 illustrates a perspective view of an SMA connector-NRD Guide combination structure according to the second preferred embodiment of the present invention, wherein a mode suppressor is inserted in the middle of the divided NRD Guide of the first preferred embodiment of the present invention.
Figure 6 illustrates a cross-sectional view of the structure of Figure 5 cut in the direction of line C-C, which is vertical with the feed line of Figure 5.
Figure 7 illustrates a cross-sectional view of the NRD Guide of Figure 5 cut in the direction of line D-D', which is horizontal to the upper and lower conducting plates.
Figure 8 illustrates a cross-sectional view of a disassembled mode suppressor which is inserted in the middle of the NRD Guide of Figure 5.
Figure 9 is a graph that illustrates the NSWR (Voltage Standing Wave Ratio) characteristic of the SMA connector-ΝRD Guide combination structure illustrated in
Figure 8, depending on the distance between the end of the ΝRD Guide and the feed line (5), for the respective lengths (t) of the portion of the feed line, which is inserted into the ΝRD Guide.
Figure 10 is a graph that illustrates the VSWR characteristic depending on the length (t) of the portion of the feed line, which is inserted into the ΝRD Guide.
**Description of the codes at important parts of diagrams**
1 : Upper Conducting Plate
2: Lower Conducting Plate
3: ΝRD Guide 4: SMA Connector
5: Feed Line
6: Fixing Metal Planar
7: Rod Antenna
8: Mode Suppressor
9: Metal (Copper) Thin Film
10: Thin Teflon t: Length of Feed Line (Conductor), as inserted into NRD Guide w: Diameter of Feed Line
BEST MODE FOR CARRYING OUT THE INVENTION
Figure 1 illustrates a perspective view of an SMA connector-NRD Guide combination structure, for inputting microwaves and millimeter waves to an SMA connector (4) and feeding them to an NRD Guide (3). The waves are inputted into the SMA connector (4), are propagated along a feed line (5) which connects the SMA connector (4) and the NRD Guide (3) and, then, are fed to the NRD Guide (3). The fed waves are radiated through a rod antenna (7) after being propagated along the NRD Guide (3).
Figure 5 illustrates a perspective view of an SMA connector-NRD Guide combination structure, wherein the feed line (5) is used as illustrated in Figure 1 and a mode suppressor (8) is inserted in the middle of the divided NRD Guide (3) in order to suppress unnecessary modes of the fed waves.
Figure 2 illustrates electromagnetic field distribution of the NRD Guide (3) and the feed line(5) located in between the upper and lower conducting plates (1, 2) which maintain the pre-determined distance between them according to a certain frequency. The electromagnetic field in the NRD Guide (3) is represented as LSM mode and LSE mode. On the other hand, the electromagnetic field in the feed line(5) is represented as TE mode and TM mode. Upper/lower conducting plates (1, 2) have a linkage with the wave, a propagation wave in the feed line, of TEM mode of which electric field is in the direction of y- axis and magnetic field on a plane of y=height/2 is in the direction of x- axis. Thus, the NRD Guide (3) may be connected with the feed line (5).
The minimum value of the NSWR (Voltage Standing Wave Ratio) 1.12 may be obtained when it is measured at the frequency range around 10GHz on the following conditions: as illustrated in Figure 3 and Figure 4, the feed line(5) is inserted into the ΝRD Guide (3) by the depth of 2mm; the feed line(5) is located 5mm apart from the end of the ΝRD Guide in the direction of the line's arrangement; the gap between the upper conducting plate and the lower conducting plate is 12.2mm; the ΝRD Guide has the permittivity of 2.56 and the width of 10.5mm; and the diameter of the feed line(5) is 3mm. It is found that the distance from the end of the ΝRD Guide (3) (5mm) and the insertion depth of the feed line (5) (t) into the ΝRD Guide (3) have meager influence. On the other hand, the feeding efficiency may be improved by adjusting the diameter (w) of the feed line (5). In the second preferred embodiment of the present invention, the ΝRD
Guide (3) is divided and a mode suppressor (8) is inserted into the ΝRD Guide (3) as illustrated in Figure 5 for the purpose of the propagation of LSM mode of waves fed by the feed line (5), by suppressing unnecessary modes which arise in the ΝRD Guide (3). The mode suppressor (8) has a metal thin film (9) in the shape of a λ/4 choke mounted between thin Teflons (10) as illustrated in Figure 8. The gap between the notches of the metal thin film (9) is 4mm, equivalent to the length of λ/4. wl is 2mm and w2 is 12mm. By inserting a mode suppressor (8) as in the second preferred embodiment of the present invention, unnecessary modes which arise in the NRD Guide (3) at the frequency range around 10GHz may be suppressed.
Figure 9 illustrates NSWR characteristics depending on the distance between the end of the ΝRD Guide and the feed line (5), for the respective lengths (t) of the portion of the feed line, which is inserted into the ΝRD Guide. The NSWR is generally low when the feed line (5) is located 5mm apart from the end of the ΝRD Guide (3). When the length (t) of the portion of the feed line (5) inserted into the ΝRD Guide (3) is 2mm, the VSWR characteristic is the best.
Figure 10 is a graph that illustrates VSWR characteristic depending on the length (t) of the portion of the feed line(5) inserted into the ΝRD Guide. As illustrated in Figure 9, when the length (t) is 2mm, the VSWR is the lowest.
INDUSTRIAL APPLICABILITY
As explained in the foregoing, according to the present invention, by connecting an SMA connector and an NRD Guide with a feed line (3) and by inserting a mode suppressor (8) into the divided NRD Guide, it is possible to effectively suppress unnecessary modes in the NRD Guide (3).
Also, according to the present invention, it is made possible to transmit microwaves and waves in the millimeter wave band using the coaxial cable of the related art. Further, it is made possible to transmit waves of a desired frequency with low loss by adjusting the diameter of the feed line, because the smaller the diameter of the feed line, the better effect of suppressing unnecessary modes.
The foregoing embodiments and advantages of the present invention are merely exemplary and are not to be construed as limiting the present invention. The present teaching can be readily applied to other types of apparatuses. The description of the present invention is intended to be illustrative, and not to limit the scope of the claims. Many alternatives, modifications, and variations will be apparent to those skilled in the art. The claims are intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures.

Claims

WHAT IS CLAIMED IS:
1. An SMA coimector-NRD Guide combination structure for feeding microwaves and millimeter waves inputted into the SMA connector to the NRD Guide, wherein: the SMA connector and the NRD Guide are connected by using a feed line(5); and the NRD Guide is divided and a mode suppressor is inserted in the middle of the divided NRD Guide.
2. The SMA connector-NRD Guide combination structure of claim 1, wherein it is possible to regulate a desirable frequency by adjusting the diameter of the feed line.
3. The SMA connector-NRD Guide combination structure of claim 1, wherein the SMA connector and the NRD Guide are connected by using a feed line.
4. The SMA connector-NRD Guide combination structure of claim 1, wherein the NRD Guide is divided and the mode suppressor is inserted in the middle of the divided NRD Guide.
PCT/KR2002/000196 2001-02-20 2002-02-07 Coupling structure for sma connector-nrd guide WO2002067366A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020010008338A KR100358979B1 (en) 2001-02-20 2001-02-20 Coupling Structure for SMA Connector -NRD Guide
KR2001-0008338 2001-02-20

Publications (1)

Publication Number Publication Date
WO2002067366A1 true WO2002067366A1 (en) 2002-08-29

Family

ID=19705984

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2002/000196 WO2002067366A1 (en) 2001-02-20 2002-02-07 Coupling structure for sma connector-nrd guide

Country Status (3)

Country Link
KR (1) KR100358979B1 (en)
CN (1) CN1491457A (en)
WO (1) WO2002067366A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040041565A (en) * 2004-04-27 2004-05-17 엔알디테크 주식회사 NRD Guide Strip Line Converter
KR100725445B1 (en) * 2004-09-07 2007-06-12 엔알디테크 주식회사 NRD guide-Microstrip line Transition
CN104064852A (en) * 2013-03-19 2014-09-24 德克萨斯仪器股份有限公司 Horn Antenna For Transmitting Electromagnetic Signal From Microstrip Line To Dielectric Waveguide
CN108172962B (en) * 2017-12-21 2021-03-26 电子科技大学 Broadband circular waveguide directional coupler for microwave power measurement

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0738312A (en) * 1993-07-16 1995-02-07 Japan Energy Corp Manufacture of millimeter wave device
JPH09219601A (en) * 1996-02-14 1997-08-19 Nissan Motor Co Ltd Connection/installation structure of diode mounted substrate in nrd guide diode circuit
JP2000059114A (en) * 1998-08-04 2000-02-25 Sharp Corp Frequency adjusting device for nrd guide millimeter wave band oscillator
JP2000114823A (en) * 1998-10-08 2000-04-21 New Japan Radio Co Ltd Nrd guide gun oscillator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0738312A (en) * 1993-07-16 1995-02-07 Japan Energy Corp Manufacture of millimeter wave device
JPH09219601A (en) * 1996-02-14 1997-08-19 Nissan Motor Co Ltd Connection/installation structure of diode mounted substrate in nrd guide diode circuit
JP2000059114A (en) * 1998-08-04 2000-02-25 Sharp Corp Frequency adjusting device for nrd guide millimeter wave band oscillator
JP2000114823A (en) * 1998-10-08 2000-04-21 New Japan Radio Co Ltd Nrd guide gun oscillator

Also Published As

Publication number Publication date
CN1491457A (en) 2004-04-21
KR100358979B1 (en) 2002-11-01
KR20010044427A (en) 2001-06-05

Similar Documents

Publication Publication Date Title
US5867073A (en) Waveguide to transmission line transition
US4463324A (en) Miniature coaxial line to waveguide transition
Rahali et al. Design of K-Band substrate integrated waveguide coupler, circulator and power divider
WO2012051521A1 (en) Radio frequency (rf) microwave components and subsystems using loaded ridge waveguide
WO2016186136A1 (en) Coaxial microstrip line conversion circuit
CN114188686B (en) H-face waveguide/microstrip probe conversion device
JP2000101311A (en) Transformer for microstrip line-to-waveguide
Kazemi et al. Design of a wide band eight-way compact SIW power combiner fed by a low loss GCPW-to-SIW transition
WO2002067366A1 (en) Coupling structure for sma connector-nrd guide
CN114156658B (en) Broadband transmission line
Yoneyama Millimeter‐wave integrated circuits using nonradiative dielectric waveguide
Tikhov et al. Compact broadband transition from double-ridge waveguide to coaxial line
Tang et al. A dielectric based waveguide integrated in a multilayer PCB for ultra high speed communications
CN114050407B (en) Waveguide mode excitation structure, method and application thereof
KR102683851B1 (en) Metallic line mode converter
Sun et al. A Low-loss CPW-DWG-CPW Transition
CN113937450B (en) Coupler, transceiver module and communication system
Dong et al. Broadband stripline to rectangular waveguide transition
Debnath et al. Substrate integrated non-radiative dielectric waveguide and its applications
CN114759331B (en) Low-loss broadband transmission line and transmission structure
Zhang et al. A flexible non-radiative dielectric waveguide with a 1-dB loss PCB-to-NRD coupler for mm-wave array applications
Simion Partially dielectric-filled rectangular waveguide configuration, proposed for broadband and low loss substrate integrated waveguides design
Dolatsha et al. Power divider based on grounded dielectric slab waveguide operating in E 11 x mode
KR100333133B1 (en) NRD Guide TE Mode Antenna System
JPH02213201A (en) Waveguide-microstrip line converter

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ OM PH PL PT RO RU SD SE SG SI SK SL TJ TM TN TR TT TZ UA UG US UZ VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
WWE Wipo information: entry into national phase

Ref document number: 02805010X

Country of ref document: CN

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP