GB2142481A - A wave guide to microstrip microwave transition - Google Patents

A wave guide to microstrip microwave transition Download PDF

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Publication number
GB2142481A
GB2142481A GB08317642A GB8317642A GB2142481A GB 2142481 A GB2142481 A GB 2142481A GB 08317642 A GB08317642 A GB 08317642A GB 8317642 A GB8317642 A GB 8317642A GB 2142481 A GB2142481 A GB 2142481A
Authority
GB
United Kingdom
Prior art keywords
waveguide
microstrip
substrate
slots
stub
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
GB08317642A
Other versions
GB8317642D0 (en
Inventor
Amitava Banerjee
Roger Hill
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Decca Ltd
Original Assignee
Decca 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 Decca Ltd filed Critical Decca Ltd
Priority to GB08317642A priority Critical patent/GB2142481A/en
Publication of GB8317642D0 publication Critical patent/GB8317642D0/en
Publication of GB2142481A publication Critical patent/GB2142481A/en
Withdrawn legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00Coupling devices of the waveguide type
    • H01P5/08Coupling devices of the waveguide type for linking dissimilar lines or devices
    • H01P5/10Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced lines or devices with unbalanced lines or devices
    • H01P5/107Hollow-waveguide/strip-line transitions

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  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

A waveguide to microstrip microwave transition comprises a rectangular waveguide 1 having broad-wall longitudinal slots 2 and 3 at an open end thereof. A substrate plate 4, carrying a microstrip array antenna 5 can be located in the slot so as to extend across the waveguide perpendicular to the broad walls thereof. A length of microstrip line 8 extends from the array antenna into the open end of the waveguide and terminates in a coupling stub 9. A ground plane 7 provided on the opposite face of the substrate to the microstrip line extends right across the narrow dimension of the waveguide and terminates at a distance from the stub chosen to maximise the energy coupling. The waveguide and substrate may have interengaging threaded rings. <IMAGE>

Description

SPECIFICATION A waveguide to microstrip microwave transition This invention relates to a waveguide to microstrip microwave transition, and more specially wherein the microstrip is connected to a microstrip array antenna.
Microstrip array antennas offer a cheap and relatively simple method of producing both omni directional and wide beam radiators. It is known to connect a microstrip array antenna to a microwave waveguide by a coaxial cable. The coaxial cable has a connection in a broad wall of the waveguide and includes a stub member which is positioned so as to couple microwave energy between the waveguide and the microstrip array antenna. With use of this form of connection it is important that radiation is not radiated from the waveguide end with a conse quent energy loss. In addition the form of connection is not particularly robust thereby restricting its usage.
It is an object of the invention to provide a waveguide to a microstrip microwave transition which is both convenient and easy to use, and has a robust construction.
According to the invention there is provided a waveguide to microstrip microwave transition com prising a rectangularwaveguide having provided in an open end thereof longitudinal slots extending from the end into the broad walls of the waveguide; a microstrip substrate plate locatable into said slots so as to extend across the waveguide perpendicular to said broad walls; a length of microstrip line provided on one face of the substrate so as to extend into the open end of the waveguide and terminating in a stub located in the waveguide and capable of coupling microwave energy between the waveguide and the microstrip line; and a conducting plane provided on the opposite face of the substrate so as to extend right across the narrow dimension of the waveguide between said slots; an inner edge of the said plane extending perpendicularly to said broad walls at a predetermined distance from said stub to maximise said energy coupling. Conveniently the microstrip line is connected to a microstrip array antenna, and the stub is L shaped and located centrally with respect to the waveguide broad dimension. In this way the substrate plate carrying the microstrip can be easily removed and easily located within the waveguide end. By mounting the substrate plate into said slots it is convenient to orientate the array vertically to provide thereby wide beam azimuth coverage over a limited elevation, for example as an automatic transponder in a naviga tional aid system.Furthermore the conducting plane extending right across the narrow dimension of the waveguide acts as a reflector to substantially elimin ate radiation of microwave energy from the wave guide end. Preferably the waveguide end is sealed with a non-electrically conductive material to pre vent ingress of moisture into the waveguide. The substrate plate can be maintained in its position in the slots by including a connecting means compris ing a threaded flange provided at the waveguide end and a threaded ring associated with the substrate and capable of screwing on to the flange to urge thereby the substrate into the slots. Consequently a stable and robust waveguide to microstrip microwave transition is produced.
Examples of the present invention will now be described with reference to the accompanying drawings in which: Figure 1 illustrates a waveguide to microstrip microwave transition; Figure 2 illustrates a waveguide to microstrip microwave transition including connecting means.
Referring to the drawings a rectangular microwave waveguide 1 has two longitudinal slots 2 and 3 extending from the end of the waveguide into the broad walls thereof. A substrate plate 4 is located into the slots.
The plate 4 has provided thereon a microstrip line 8 connecting to a microstrip array antenna 5 also provided on the substrate plate. The microstrip array antenna can be of various types, for example, a Derneryd Array (reference Derneryd, A.G., 'Linearly Polarised Microstrip Antennas', IEEE Trans. on Antenna and Propagation, 846 - 850, (Nov. 1976)).
However that shown was described in 'A twin line omnidirectional aerial configuration', 8th European Microwave Conference, Paris, September 1978 p.p.
307-311. The microstrip line terminates at its lower end with a L shaped stub 9. The line 8 is arranged so that when the plate 4 is located in the slots the line extends into the open end of the waveguide. The stub 9 is thereby located approximately centrally within the waveguide.
A conducting plane 7 is provided on the opposite face of the substrate to the microstrip line and is located such that when the substrate is positioned within the slots the conducting plane extends right across the narrow dimension of the waveguide between the slots and an inner edge of the plane extends perpendicularly to the broad walls of the waveguide. The stub ending is then located at a predetermined distance from the inner edge of the plane in orderto maximise the coupling of microwave energy between the waveguide and the microstrip line. The predetermined distance is preferably one quarter of the wavelength of the microwave radiation to be radiated.
As a consequence of the location of the plane microwave radiation is prevented from radiating from the waveguide end and microwave radiation is coupled from the waveguide to the microstrip array antenna by means of the microstrip line. In this way the microstrip substrate plate 4 can easily be removed from the waveguide end and easily replaced.
Furthermore the loss of energy by radiation of microwaves from the waveguide end is prevented by the conducting plane 7. The waveguide to microstrip microwave transition is secure and robust and allows quick assembly by insertion cf the substrate into the slots. The end of the waveguide can also be sealed with a non-electrically conducting material to seal the waveguide against entry of water.
Referring to Figure 2 a waveguide 1 is connected at its end to a threaded flange 12. The waveguide includes slots 2 and 3 to allow the location of the substrate plate. A threaded flange ring 10 includes a central aperture 11 through which the substrate plate can be inserted. The substrate plate is formed to be T shaped and the substrate plate is inserted through aperture 11 so that when the flange ring 10 is located above the flange 12 the section of the plate having a broader width is located between the ring and the flange. The broader section of the substrate plate includes the microstrip line and is consequently located with slots 2 and 3. When the flange ring 10 is screwed on to the flange 12 the flange ring urges the substrate into the slots and maintains the substrate plate therein. In this way the substrate plate is held into its position in the waveguide end in a secure and robust manner which allows quick assembly and disassembly.
It will be apparent that other forms of stub ending can be provided and it is not essential that the microstrip array antenna and conducting plane are provided on a common substrate. The conducting plane is provided to extend across the narrow dimension of the waveguide end between said slots and can be connected to the microstrip array antenna. As an alternative to a substrate carrying the microstrip antenna which is removeable and held in place as shown in Figure 2, it will be apparent that the substrate may conveniently be connected to the waveguide slots 2 and 3 by means of an adhesive.

Claims (8)

1. A waveguide to microstrip microwave transition comprising a rectangular waveguide having provided in an open end thereof longitudinal slots extending from the end into the broad walls of the waveguide; a microstrip substrate plate locatable into said slots so as to extend across the waveguide perpendicular to said broad walls; a length of microstrip line provided on one face of the substrate so as to extend into the open end of the waveguide and terminating in a stub located in the waveguide and capable of coupling microwave energy between the waveguide and the microstrip line; and a conducting plane provided on the opposite face of the substrate so as to extend right across the narrow dimension of the waveguide between said slots; an inner edge of the said plane extending perpendicularlyto said broad walls at a predetermined distance from said stub to a maximise said energy coupling.
2. A waveguide to microstrip microwave transition as claimed in claim 1 wherein the microstrip line is connected to a microstrip array antenna.
3. A waveguide to microstrip microwavetransition as claimed in claim 1 or 2 wherein the stub is L shaped and located centrally with respect to the waveguide broad dimension.
4. A waveguide to microstrip microwave transition as claimed in any preceding claim wherein the waveguide end is sealed with a non-electrically conductive material.
5. A waveguide to microstrip microwavetransition as claimed in any preceding claim including connecting means arranged to hold the substrate in said slots.
6. A waveguide to microstrip microwavetransition as claimed in claim 5 wherein the connecting means comprises a threaded flange provided at the waveguide end and a threaded ring associated with the substrate and capable of screwing on to the flange to urge thereby the substrate into the slots.
7. A waveguide to microstrip microwave transition as claimed in claim 5 wherein the connecting means comprises an adhesive.
8. A waveguide to microstrip microwavetransition substantially as herein described with reference to the accompanying drawings.
GB08317642A 1983-06-29 1983-06-29 A wave guide to microstrip microwave transition Withdrawn GB2142481A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08317642A GB2142481A (en) 1983-06-29 1983-06-29 A wave guide to microstrip microwave transition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08317642A GB2142481A (en) 1983-06-29 1983-06-29 A wave guide to microstrip microwave transition

Publications (2)

Publication Number Publication Date
GB8317642D0 GB8317642D0 (en) 1983-08-03
GB2142481A true GB2142481A (en) 1985-01-16

Family

ID=10544976

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08317642A Withdrawn GB2142481A (en) 1983-06-29 1983-06-29 A wave guide to microstrip microwave transition

Country Status (1)

Country Link
GB (1) GB2142481A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991013473A1 (en) * 1990-03-01 1991-09-05 Agence Spatiale Europeenne Horn radiator for electromagnetic waves
US5095292A (en) * 1990-08-24 1992-03-10 Hughes Aircraft Company Microstrip to ridge waveguide transition

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110741273B (en) * 2016-12-29 2024-02-02 雷达视科技有限公司 Antenna array

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1494024A (en) * 1974-02-28 1977-12-07 Philips Electronic Associated Microwave device
GB1586784A (en) * 1976-09-07 1981-03-25 Philips Nv Waveguide/microstrip line mode transducer
GB1596429A (en) * 1977-04-28 1981-08-26 Hollandse Signaalapparaten Bv Microwave mixer assembly

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1494024A (en) * 1974-02-28 1977-12-07 Philips Electronic Associated Microwave device
GB1586784A (en) * 1976-09-07 1981-03-25 Philips Nv Waveguide/microstrip line mode transducer
GB1596429A (en) * 1977-04-28 1981-08-26 Hollandse Signaalapparaten Bv Microwave mixer assembly

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991013473A1 (en) * 1990-03-01 1991-09-05 Agence Spatiale Europeenne Horn radiator for electromagnetic waves
FR2659172A1 (en) * 1990-03-01 1991-09-06 Europ Agence Spatiale RADIANT ELEMENT FOR ELECTROMAGNETIC COUPLING WAVES GUIDE.
US5095292A (en) * 1990-08-24 1992-03-10 Hughes Aircraft Company Microstrip to ridge waveguide transition

Also Published As

Publication number Publication date
GB8317642D0 (en) 1983-08-03

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)