microwave p s ive comp nents, of IEC tec nical commit e 4 : Ca les, wires, waveg ides, RF con ectors, RF an microwave p s ive comp nents an ac es ories This third edition can els an re l
Standardized types
The series of flanges for ordinary rectangular waveguides covered by this standard are shown in Tables 5 to 9 and Figures 1 to 29
Flat flanges can be used with metal plate air seal gaskets or shims (an example is shown in Figure 1 3).
Flange designation
Waveguide flanges covered by the standard shall be indicated by a reference number comprising the following information:
– 8 – IEC 601 54-2:201 6 © IEC 201 6 a) the number of the present IEC Publication (601 54); b) the letters “IEC"; c) a dash; d) a letter relating to the basic construction of the flange, flange style, viz:
P = a flange having a gasket groove but no choke groove (formerly called pressurizable)
C = a choke flange with a gasket groove (formerly called choke, pressurizable)
U refers to a flange that lacks both a gasket groove and a choke groove, previously known as unpressurizable 1 This designation indicates the flange type as specified in the drawing Flanges sharing the same letter and waveguide size are compatible for mating Additionally, the letter and number indicate the specific waveguide for which the flange is intended.
"601 54 IEC − UDR 1 20" denotes a flange without a gasket groove of Type D, for use with rectangular waveguide
Dimensions
Alignment holes, clearly marked in the drawings, must be precision drilled and positioned closest to the narrow side of the waveguide.
Unintended holes may have less precise locations compared to alignment holes; however, they should be larger in diameter to guarantee proper flange mating.
5.1 2 Shank diameter of fixing bolts used for alignment
The basic values and deviations thereon are specified in Tables 1 to 5 and Figures 1 5 to 21
5.1 3 Relation between shank and alignment hole diameters
To ensure the proper mating of individual flanges, it is essential to specify the location and basic diameters of the holes along with their deviations, as well as the basic diameters of the coupling bolt shanks with the appropriate fit.
For practical reasons, the ISO fits given in Table 1 are recommended:
1 AII flat flanges shall have this designation, including those that can be made pressure tight by using gaskets as indicated in 4.1
Type of fl ang e Rang e of size Fi t
Rectang ul ar flang es for type R waveguide
Circul ar flang e for type R waveg uide All B9
When electrical requirements make it necessary, the hole position tolerance should be reduced and the hole diameter fit to the shank should be improved accordingly
Actual values are shown in the respective drawings and tables
5.1 4 Overall dimensions and thickness of flanges
The values provided are derived from established designs and primarily pertain to brass; however, different materials may require alternative values for accuracy.
5.1 5 Surface roughness of contact area of flanges
The flatness of contact area shall be better than the values given in Table 2:
Table 2 – Requirements of root mean square of roughness on the contact area
Rang e of sizes Requirement of root mean square of roughness mm
R 1 2 and larg er di mensi ons For subsequent study
5.1 7 Perpendicularity of the axis of the holes
The perpendicularity of the axis of the holes to the contact area of the flange shall be 90° ± 1 /4°
Positioning of the holes shall be based on the theoretical symmetry lines of the inside cross- section of the waveguide unless otherwise indicated
5.1 9 Perpendicularity of the contact area
The perpendicularity of the contact area of the flange to the axis of the waveguide shall be 90° ± 1 /4°
Additional requirements for unmounted flanges 1 0
General 1 0
The illustrations depict mounted flanges, showcasing various methods for attaching flanges to the waveguide While these examples highlight specific techniques, they do not rule out socket or through-type mounting methods, provided the dimensions permit It is recommended to use the socket type method for flanges equipped with a choke groove.
For flange sizes PDR 3 to PDR 1 2 and UDR 3 to UDR 1 2, users have the flexibility to choose the specific cross-section of the flanges according to their preferences.
Grooved flanges utilize a rectangular gasket, as illustrated in Figure 1 The specific dimensions of the grooves and gaskets for flange sizes PDR 3 to PDR 12 will be determined in future research.
Flanges are specifically engineered for use with copper, aluminum, and magnesium alloys, with users required to specify the exact alloy type and finish To minimize galvanic or other corrosive actions, appropriate measures will be implemented unless stated otherwise Additionally, users must specify the type of gasket and gasket material to be utilized.
For pre-drilled flanges, the positioning of the holes should be based on the theoretic symmetry lines of the flange aperture.
Shape of aperture 1 0
The requirements for the dimensions of the aperture in the flange only apply to that part which effects mating between the flange and the waveguide
The basic dimensions of the flange aperture shown in Table 1 are equal to the basic outside dimensions of the tubes according to IEC 601 53-2
The deviations for the dimensions of the aperture will depend on the materials and assembly methods and shall, therefore, be determined by agreement between purchaser and manufacturer
For socket types, the front aperture should have dimensions within the deviations specified for the inside cross-section of the appropriate size of waveguide.
Ordering information 1 0
When ordering unmounted flanges, an allowance should be made on certain of the specified dimensions to cover the effects of possible machining after mounting.
Information on reflection 1 0
Reflections at the flange joint can be categorized into three types: a) those resulting from permissible deviations in the internal dimensions of the waveguides; b) those arising from lateral displacements of the flange assemblies; and c) those due to chokes, which will not be considered further According to IEC 601 53-2, when the deviations in waveguide dimensions and assembly dimensions lead to maximum lateral displacement and changes in internal dimensions, the theoretical maximum reflection can be calculated using ISO/IEC Guide 98-3: 2008 and the relevant equation.
= b b a a b b a a g g g l l l (1 ) where a is the basic inside width of the waveguide; b is the basic inside height of the waveguide; lg is the waveguide wavelength;
∆a and ∆b are the waveguide internal deviations;
∆a ' and ∆b ' are displacements of the waveguide axes.
NOTE 1 The first term within brackets represents the worst case reflection component at a flange joint caused by changes of the waveguide internal dimensions
NOTE 2 The second term within brackets represents the reflection component at a flange joint caused by the displacement of the flange assemblies
At the high end of the waveguide frequency band, the reflection component is maximum when the displacement exists in the short wall direction only
At the low end of the waveguide frequency band, the reflection component is maximum when the displacement exists in the long wall direction only
The maximum reflection at the high end of the waveguide frequency band is lower than that at the low end when the displacement magnitude is small.
NOTE 4 The "reflection loss" in decibels is given as a positive quantity
– 1 2 – IEC 601 54-2:201 6 © IEC 201 6 Table 3 – The worst "return loss" in (positive) decibels for waveguides (1 of 2)
Flang e type Type desig nati on IEC 601 53-1 f _min in GHz in GHz f _max Return loss at f _min in dB Return l oss at f _max in dB
IEC 601 53-1 f _min in GHz in GHz f _max Return l oss at f _mi n in dB Return l oss at f _max in dB
– 1 4 – IEC 601 54-2:201 6 © IEC 201 6 Table 4 – Flange types (1 of 2)
No choke, No g asket g roove
Gui ded waveg ui de Bri de flange Guided waveg uide Bride flang e Gui ded waveg ui de
Gasket g roove; No choke Gasket g roove and choke
Guided waveg uide Bri de flange Guided waveguide Bride flang e Gui ded waveg ui de Bride flang e R3
Figure 1 – Flange type A: 601 54 IEC-AR 32
Figure 2 – Flange type A: 601 54 IEC-AR 32 gasket
The front view illustrates the gasket groove specifically for the choke type, while front views for other types can be easily derived from this drawing The provided dimensions are not critical for the proper mating of the two assemblies.
Figure 3 – Flange type A: 601 54 IEC-AR 48
Figure 4 – Flange type A: 601 54 IEC-AR 48 gasket
The front view illustrates the gasket groove specifically for the choke type, while front views for other types can be easily derived from this drawing The provided dimensions are not critical for the assembly of the two components.
Figure 5 – Flange type A: 601 54 IEC-AR 58-70
Figure 6 – Flange type A: 601 54 IEC-AR 58-70 gasket
The front view illustrates the gasket groove specifically for the choke type, while front views for other types can be easily derived from this drawing The provided dimensions are not critical for the proper mating of the two assemblies.
Table 5 – Dimensions of type A flange for ordinary rectangular waveguides (1 of 2)
Type PAR – without choke; wi th g asket groove Type U AR – wi thout choke or g asket groove
Type desi g - nati on of wave- g ui de fl ang e
To be u sed with wave- g u i de
Devi - ati on on a i n radians ±
Devi ati on a1 b1 pmin X Rmax a
40 R 40 equent study For subs- B9 For su bsequent stu dy 61 , 42 32, 33 For su bsequent study
40 R 40 equent study For subs- B9 For su bsequent stu dy 2,41 8 1 ,273 For su bsequent study
Type CAR – wi th choke and g asket groove
Type desi g - nati on of wave- g u i de fl ang e
To be u sed wi th wave- g u i de
Al i g nment h ol es b b b Dimensi ons for g askets when made of neoprene Di mensi ons for al i g nment bolts
Di ameter Abasic ISO – fi t
Fi g ure Sh ank di a- meter
40 R 40 subsequent For stu dy B9 For su bsequent study For subs- equent study h8 For subs- equent study
58 R 58 5 5,000 B9 + 0, 1 40 + 0, 1 70 47,37 0,05 55, 1 4 0,05 1 1 ,99 0,1 0 For su bs- equent study 0,51 59, 92 0,25 3,53 0,1 0 6 5,000 h8 –0, 01 8
40 R 40 For su bs- equent study B9 For su bsequent study For subs- equent study h8 For subs- equent study
58 R 58 5 0,1 970 B9 + 0,0050 + 0,0062 1 ,865 0,002 2,1 71 0,002 0,472 0,004 For su bs- equent study 0,020 2,359 0,01 0 0,1 39 0,004 6 0,1 970 h8 –0,0007
The values provided, including 70 R, 70 5, and 970 B9, represent the basic dimensions of the outside cross-section of the waveguide as specified in IEC publication 601 53 These dimensions should be considered fundamental for the aperture in section 5.2.2, applicable exclusively to unmounted flanges.
For through-type flanges, the actual range of deviations for the mounting aperture depends on the assembling method and should therefore be agreed between customer and manufacturer
For socket flanges, the front-aperture dimensions must align with the specified deviations for the inside cross-section of the corresponding waveguide size These dimensions serve as a guideline for optimal broadband performance, with actual values to be mutually agreed upon by the customer and manufacturer It is important to note that these dimensions are not critical for the proper mating of two assemblies.
Figure 7 – Flange type B: 601 54 IEC-BR 84-320
Figure 8 – Flange type B: 601 54 IEC-BR 84-320 gasket
The front view illustrates the gasket groove specifically for the choke type, while front views for other types can be easily derived from this drawing The provided dimensions are not critical for the assembly of the two components.
Table 6 – Dimensions of type B flange for ordinary rectangular waveguides (1 of 2)
Type PBR – without choke; with g asket groove Type UBR – without choke or g asket groove
Type desi g - nati on of wave-g ui de fl ang e
To be used wi th wave- g ui de
Al i g nment hol es a a c c c Devi - ati on on C ±
Devi ati on a1 b1 pmin X Rmax 2 C
1 80 R 1 80 7 For su bs- equent study C9 For subsequent stu dy 1 4, 99 8,51 For su bsequent study
260 R 260 7 For su bs- equent study C9 For subsequent stu dy 1 0, 67 6,35 For su bsequent study
1 80 R 1 80 7 For su bs- equent study C9 For subsequent stu dy 0,590 0,335 For su bsequent study
260 R 260 7 For su bs- equent study C9 For subsequent stu dy 0,420 0,250 For su bsequent study
Type PBR – wi thou t ch oke; wi th g asket groove Type UBR – without choke or g asket groove
Type desi g - nati on of wave-g ui de fl ang e 601 54
To be u sed with wave- g u i de
Al i g nment h ol es b c b Dimensi ons for g askets when made of neoprene Di mensi ons for al i g nment bolts
Di ameter Abasic I SO – fi t
Fi g ure Sh ank di ameter I SO
1 80 R 1 80 7 For subs- equent study C9 For su bsequent study For su bs- equent stu dy 0
260 R 260 7 For subs- equent study C9 For su bsequent study For su bs- equent stu dy 0
1 80 R 1 80 7 For subs- equent study C9 For su bsequent study For su bs- equent stu dy 0
260 R 260 7 For subs- equent study C9 For su bsequent study
For su bs- equent stu dy 0
The values provided, including 320 R, 320, 7, 0.1, 1, 80 C9, and others, represent the basic dimensions of the external cross-section of the waveguide as specified in IEC publication 601 53 These measurements should be considered fundamental for the aperture as outlined in section 5.2.2, applicable exclusively to unmounted flanges.
For through-type flanges, the actual range of deviations for the mounting aperture depends on the assembling method and should therefore be agreed between customer and manufacturer
For socket flanges, the front-aperture dimensions must align with the specified deviations for the inside cross-section of the corresponding waveguide size These dimensions serve as a guideline for optimal broadband performance, with actual values to be mutually agreed upon by the customer and manufacturer It is important to note that these dimensions are not critical for the proper mating of two assemblies.
Figure 9 – Flange type C: 601 54 IEC-PCR 220-500
Figure 1 0 – Flange type C: 601 54 IEC-PCR 220-500 gasket
Table 7 – Dimensions of type C flange for ordinary rectangular waveguides (1 of 2)
Type desi g - nati on of wave- g ui de fl ang e
To be u sed wi th wave- g ui de
Fi g ure a a Devi - ati on on C ±
Dimensi ons for g askets when made of neoprene a1 b1 C cbasic dbasic Fi g ure Dimensions in millimeters
Type desig- nation of waveguide flange 601 54
To be used with wave- guide
220 R 220 25, 40 8,890 0,1 30 21 , 625 0,01 5 9,767 0,064 2,248 0,01 3 9,767 0,064 25, 40 5,207 4,445 20, 383 0,064 For su bs- equent stu dy
220 R 220 1 ,000 0,350 0,005 0,851 4 0,0006 0,3845 0,0025 0,0885 0,0005 0,3845 0,0025 1 ,000 0,2050 0,1 75 0,8025 0,0025 For su bs- equent stu dy
500 R 500 0,688 0,260 0,005 0,591 5 0,0005 0,2565 0,0025 0,0925 0,0005 0,2650 0,0050 0,688 0,2340 0,1 34 0,5500 0,0020 0,600 0,750 a These dimensions are not essential for the mating of two assemblies
Figure 1 1 – Flange type C: 601 54 IEC-PCR 220-500
Figure 1 2 – Flange type C: 601 54 IEC-PCR 220-500 gasket
Dimensions in millimetres (dimensions in inches)
Flang e mm A in mm B in mm C in mm D in
The UDR measurements indicate varying values across different units, with UDR 3 showing a mean of 92.08 ± 0.40 and UDR 4 at 79.38 ± 0.40 UDR 5 records a mean of 58.75 ± 0.40, while UDR 6 has a mean of 39.70 ± 0.40 UDR 7 presents a mean of 17.48 ± 0.40, and UDR 9 shows 06.38 ± 0.40 UDR 12 has a mean of 93.68 ± 0.40 Notably, these surfaces incorporate pressure seals and include raised electrical contact areas that begin at the inside dimensions of the waveguide Furthermore, the inside dimensions of the waveguide tubing at the flanges must conform to the specifications outlined in the latest issue of IEC Publication 601 53-2.
Figure 1 3 – Recommended gaskets for flanges without gasket groves
3,1 8 ±0,1 3 (0,1 25 ±0,005) Hole size and alignment as for flanges PDR 3 to PDR 1 2 inclusive
Fl ange A B mm in mm in
PDR 3 PDR 4 PDR 5 PDR 6 PDR 8 PDR 9 PDR 1 2
Dimension C D E F G H I mm ±∆mm in ±∆in
All dimensions are for subsequent study
Figure 1 4 – Recommended gaskets for type PDR 3 to 1 2 flanges
Dimensions in millimetres (dimensions in inches)
Diameters for bolts mm in
The dimensions of the waveguide tubing at the flanges must conform to the specifications outlined in the latest issue of IEC Publication 601 53-2, ensuring compliance with the required measurements and tolerances This standardization applies to flanges designed for bolts with a basic shank diameter of 0.500 inches, with careful consideration given to clearance and positional deviations to accommodate these bolts effectively.
1 2,70 mm (0,500 in) as well as 1 2 mm (0,472 in) can be used without violating the electrical requirements c These dimensions are not essential for the mating of two assemblies
Figure 1 5 – Flange type D: 601 54 IEC-PDR 3 AND UDR 3
Dimensions in millimetres (dimensions in inches)
Diameters for bolts mm in
The dimensions of the waveguide tubing at the flanges must conform to the specifications outlined in the latest issue of IEC Publication 601 53-2 The standardized value pertains to flanges designed for bolts with a basic shank diameter of 0.500 inches, ensuring appropriate clearance and positional deviations for optimal performance.
1 2,70 mm (0,500 in) as well as 1 2 mm (0,472 in) can be used without violating the electrical requirements c These dimensions are not essential for the mating of two assemblies
Figure 1 6 – Flange type D: 601 54 IEC-PDR 4 AND UDR 4
Dimensions in millimetres (dimensions in inches)
Diameters for bolts mm in
The dimensions of the waveguide tubing at the flanges must conform to the specifications outlined in the latest IEC Publication 601 53-2, with a tolerance of ±0.24 mm (±0.0095 in) The standard flange design accommodates bolts with a basic shank diameter of 0.375 in (9.53 mm), allowing for the use of bolts up to 0.394 in (10 mm) without compromising electrical integrity It is important to note that these dimensions are not critical for the proper mating of two assemblies.
Figure 1 7 – Flange type D: 601 54 IEC-PDR 5 AND UDR 5
Dimensions in millimetres (dimensions in inches)
Diameters for bolts mm in
The dimensions of the waveguide tubing at the flanges must conform to the specifications outlined in the latest IEC Publication 601 53-2, with measurements in millimeters and inches provided Standardization has been established for flanges designed to accommodate bolts with a basic shank diameter of 0.375 inches, allowing for the use of bolts measuring 9.53 mm (0.375 in) and 10 mm (0.394 in) without compromising electrical requirements It is important to note that these dimensions are not critical for the mating of two assemblies.
Figure 1 8 – Flange type D: 601 54 IEC-PDR 6 AND UDR 6
Dimensions in millimetres (dimensions in inches)
Diameters for bolts mm in