A Waveguide is a hollow metallic tube of any cross section through which the transmission of the electromagnetic waves takes place by the successive reflections from the inner walls of the tube. The cross section of the waveguide is related to the frequency of the waves and is suitable for the transmission of signal in microwave frequency range. The rectangular waveguide is by far more important from a practical point of view, mainly because of the simplicity of the propagation phenomena involved.



Waveguide size




Free.range(Ghz) Material Outside Dimensions(Nominal) Wall thickness Theoretical Ins. Loss dB/100 ft.
WR-19 40.00-60.00 Copper .268*.174 .040 34.00
WR-22 33.00-50.00 Copper .304*.195 .040 22.00
WR-28 26.50-40.00 Copper, Brass .60*.220 .040 22.00, 27.00
WR-34 22.00-33.00 Copper, Brass .420*.250 .040 18.00, 22.50
WR-42 18.00-26.00 Copper, Brass .500*.50 .040 14.00, 17.50
WR-51 15.00-22.00 Copper, Brass .590*.250 .040 10.00, 12.50
WR-62 12.40-18.00 Copper, Brass .702*.391 .040 6.50, 8.20
WR-75 10.00-15.00 Copper, brass. .850*.475 .040 5.25, 6.50
WR-90 8.20-12.40 Copper, Brass 1.000*.500 .050 4.12, 5.50
WR-112 7.05-10.00 Copper, Brass 1.250*.625 .064 2.75, 3.50
WR-137 5.85-8.20 Copper, Brass 1.5000*.750 .064 2.00*2.50
WR-159 4.90-7.05 Copper, Brass 1.718+-923 .064 1.50, 2.10
WR-187 3.95-5.85 Copper, brass 2.000*1.000 .064 1.40,1.75
WR-229 3.30-4.90 Copper, Brass 2.418*1.273 .064 93, 1.35
WR-284 2.60-3.95 Copper, Brass 3.000*1.5000 .80 .73*.95
WR-340 2.20-3.30 Brass 3.560*1.860 .080 .68
WR-430 1.70-260 Brass 4.460*2.310 .080 .45

A tunable probe helps in detecting the low frequency square wave modulated microwave singal.It is made by the use of crystal diode mounted in the transmission line. The probe is connected to the crystal detector so that the output from the detector is proportional to the square of the input voltage at the position of the probe. As the position of the probe is moved along the waveguide slot it gives output proportional to the standing wave pattern inside the waveguide.



Model Band Freq. Range(Ghz) Waveguide Crystal Detector Output Connectors
STP-124 S 2.60-3.95 WR-284 IN-21 BNC(F)
CTP-124 C 3.95-5.85 WR-229 IN-21 BNC(F)
JTP-124 J 5.85-8.20 WR-137 IN-23 BNC(F)
XTP-124 X 8.20-12.40 WR-90 IN-23 BNC(F)
KuTP-124 Ku 12.40-18.00 WR-62 IN-23 BNC(F)
KTP-124 K 18.00-26.50 WR-42 IN-23 BNC(F)

It is constructed from a cylindrical cavity resonator with a variable short circuit termination. The shorting plunger is used to change the resonance frequency of the cavity by changing the cavity length.DRF measures te frequency directly. It is particularly useful w en measuring frequency differences of small changes


Model Band Freq. Range(Ghz) Waveguide Calibration VSWR
XFM-142 X 8.20-12.40 WR-90 +1/-2 1.02
KuF-142 Ku 12.40-18.00 WR-62 +1/-2 1.02
KFM K 18.00-26.20 WR-42 +1/-2 1.02

PIN diode modulators offer an ideal way for amplitude and the pulse modulation of microwave signal through wide range of frequencies. These modulators utilize PIN diode which are mounted across the waveguide line with a R.F isolated DC bias lead passing to an external TNC (F) connectors.


Model Bias Voltage Output Connector Waveguide
XPM-155 10 Volts TNC(F) WR-90    

This is an economical source of microwave power in which Gunn diode is used which work on negative resistance produced by application of DC bias. Precision micrometer filled with the plungers is used to change e the frequency of the oscillations.


Model Bias Voltage Output Connector Waveguide
XGO-111 10 Volts TNC(F) WR-90    

It is a waveguide of suitable length having octal base on the broad wall of the waveguide for mounting the klystron tube. It consists of movable short one end of the waveguide to direct the microwave engry generated by the klystron tube. A small hole located exactly the center of the board wall oft e waveguide is used to put the coupling pin of the tube as the electric held vector of EM energy is maximum at the center only. The maximum power transfer can be achieved by tuning of the movable plunger.



Model Band Freq. Range(Ghz.) Waveguide
SKM-141 S 2.60-3.95 WR-284    
CKM-141 C 3.95-5.85 WR-229    
JKM-141 J 5.85-8.20 WR-137    
XKM-141 X 8.20-12.40 WR-90    
KuM-141 Ku 12.40-18.00 WR-62    

This system consists of a transmission line (waveguide), a traveling probe carriage and facility for attaching/detecting instruments. The slot made in the center of the broad face do not radiate for any power of dominant mode. Slottedsection is basically used to measure. Standing wave ratio (VSWR).The precision built probe carriage having centimeters scale with a vernier reading of 0.1 mm least count is used to note the position to the probe. Additionally slotted section can be used to measure impedance, reflection coefficient and the return loss.


Model Band Freq. Range(Ghz) Waveguide VSWR Slope(dB)
SSL-123 S 2.60-3.95 WR-284 1.02 +/-0.2
CSL-123 C 3.95-5.85 WR-229 1.02 +/-0.2
JSL-123 J 5.85-8.20 WR-137 1.02 +/-0.2
XSL-123 X 8.20-12.40 WR-90 1.02 +/-0.2
KUSL-123 Ku 12.40-18.00 WR-62 1.02 +/-0.2
KSL-123 K 18.00-26.50 WR-42 1.02 +/-0.2


For perfect matching sometimes it is required that the microwave power in a waveguide be absorbed completely without any reflection and also insensitive to frequency. For this attenuators are used. Attenuators are commonly used for measuring power gain or loss in dBs for providing isolation between instruments, for reducing the power. Input to a particular stage to prevent overloading.Jayaraj Microwaves offers Fixed and variable attenuators to its customers.


These attenuators provide continuous attenuation of power upto 20 dB.


Model Band Freq. Range(Ghz) Waveguide Attenuation Accuracy
SVA-122 S 2.60-3.95 WR-284 0.20 +/-0.5dB
CVA-122 C 3.95-5.85 WR-229 0.20 +/-.5dB
JVA-122 J 5.85-8.20 WR-137 0.20 +/-.5dB
XVA-122 X 8.20-12.40 WR-90 0.20 +/-.5dB
KuV-122 Ku 12.40-18.00 WR-62 .20 +/-.5dB
KVA-122 K 18.00-26.50 WR-42 0.20 +/-.5dB


These attenuators provide FIXED attenuation of 3,6,10,20 db.


Model Band Freq. Range(Ghz) Waveguide Attenuation VSWR Accuracy
SFA-103 S 2.60-3.95 WR-284 3,6,10,20 1.08 +/-0.5dB
CFA-103 C 3.95-5.85 WR-229 3,6,10,20 1.08 +/-.5dB
JFA-103 J 5.85-8.20 WR-137 3,6,10,20 1.08 +/-.5dB
XFA-103 X 8.20-12.40 WR-90 3,6,10,20 1.08 +/-.5dB
KuFA-103 Ku 12.40-18.00 WR-62 3,6,10,20 1.08 +/-.5dB
KFA-103 K 18.00-26.50 WR-42 3,6,10,20 1.08 +/-.5dB


An E-plane tee is a waveguide tee in which the axis of its side arm is parallel to the E field of the main guide. If the collinear arms are symmetric about the side arm, there are two transmission characteristics. When waves are fed into the side arm, the wave appearing in collinear arms will be in opposite phase and in the same magnitude.


Model Band Freq. Range(Ghz) Waveguide VSWR
SET-115 S 2.60-3.95 WR-284 1.2
CET-115 C 3.95-5.85 WR-229 1.2
JET-115 J 5.85-8.20 WR-137 1.2
XET-115 X 8.20-12.40 WR-90 1.2
KuET-115 Ku 12.40-18.00 WR-62 1.2
KET-115 K 18.00-26.50 WR-42 1.2


An H-plane TEE is a waveguide TEE in which the axis of its side arm is shunting the E-field or parallel to the H-lied of the main guide. It is formed by cutting a rectangular slot along the width of a main guide and attached another waveguide.


Model Band Freq. Range(Ghz) Waveguide VSWR
SHT-116 S 2.60-3.95 WR-284 1.2
CHT-116 C 3.95-5.85 WR-229 1.2
JHT-116 J 5.85-8.20 WR-137 1.2
XHT-116 X 8.20-12.40 WR-90 1.2
KuHT-116 Ku 12.40-18.00 WR-62 1.2
KHT-116 K 18.00-26.50 WR-42 1.2


It is used for the impedance matching in the transmission lines. A tuning screw attached with a micrometer along with the carriage helps in the impedance matching. Mismatchesup to 20:1 can be tuned to a VSWR of less than 1.02 at any frequency in the waveguide band.


Model Band Freq. Range(Ghz) Waveguide VSWR
SST-128 S 2.60-3.95 WR-284 1.02
CST-128 C 3.95-5.85 WR-229 1.02
TST-128 J 5.85-8.20 WR-137 1.02
XST-128 X 8.20-12.40 WR-90 1.02
KuST-128 Ku 12.40-18.00 WR-62 1.02
KST-128 K 18.00-26.50 WR-42 1.02


It is a multiport waveguide junction in which a wave can flow only from nth port to (n+1) th port in one direction. Although there is no restriction on the number of ports, the three-port microwave circulator generally used.


Model Band Freq. Range(Ghz) Waveguide VSWR Insertion Loss(mm.) Isolation
JT-131   5.85-8.20 WR-137 1.2 0.5dB 20dB
XT-131   8.20-12.40 WR-90 1.2 0.5dB 20dB


An isolator is a non reciprocal transmission device that is used to isolate on component from reflections of other components in the transmission line. An ideal isolator completely absorbs the power for propagation in one direction and provides lossless transmission in the opposite direction.


Model Band Freq. Range(Ghz) Waveguide VSWR Insertion Loss(mm.) Isolation
JIS-140   5.85-8.20 WR-137 1.2 0.5dB 20dB
XIS-140   8.20-12.40 WR-90 1.2 0.5dB 20dB


Detector mounts are used detect the low frequency signal with the help of the IN23 detector diode. The detector diode is mounted on the broad wall of the waveguide. A shorting plunger is used to tune the max.Power near the detector diode.


Model Band Freq. Range(Ghz) Waveguide O/P Connector CRYSTAL DIODE
SDM-125 S 2.60-3.95 WR-284 BNCF) IN21
CDM-125 C 3.95-5.85 WR-229 BNC(F) IN21
JDM-125 J 5.85-8.20 WR-137 BNC(F) IN23
XDM-125 X 8.20-12.40 WR-90 BNC(F) IN23
KuDM-125 Ku 12.40-18.00 WR-62 BNC(F) IN23
KDM-125 K 18.00-26.50 WR-42 BNC(F) IN23


This adaptor consists of a short section of standard waveguide with probe transition coaxial mounted on board wall. It transforms waveguide impedance into coaxial impedance low.VSWR is maintained for optimum coupling.


Model Band Freq. Range(Ghz) Waveguide O/P Connector VSWR
SA-167 S 2.60-3.95 WR-284 N-TYPE(F) 1.3
CA-167 C 3.95-5.85 WR-229 N-TYPE(F) 1.3
JA-167 J 5.85-8.20 WR-137 N-TYPE(F) 1.3
XA-167 X 8.20-12.40 WR-90 N-TYPE(F) 1.3
KuA-167 Ku 12.40-18.00 WR-62 N-TYPE(F) 1.3
KA-167 K 18.00-26.50 WR-42 N-TYPE(F) 1.3


These are used to obtain a phase reference in the calibration of various experimental set-up and are also used to very the effective plane of reflection therefore the phase of reflected wave. These are also useful in impedance measurement.


Model Movable short Model Movable precision short Band Freq. Range(Ghz) Waveguide
S 2.60-3.95 WR-284
C 3.95-5.85 WR-229
J 5.85-8.20 WR-137
X 8.20-12.40 WR-90
Ku 12.40-18.00 WR-62
K 18.00-26.50 WR-42


Phase shifters are used in those applications where fixed or variable amount of phase shift is required in the wave guide system.The magnitude of the guided wavelength is changed to get the desired phase shift.Most commonly used phase shifter consist of dielectric slab to introduce the phase shift in the wave guide system.The dielectric slab is made up of low loss dielectric material.


Model Band Freq. Range(Ghz) Waveguide VSWR
SPS-169 S 2.60-3.95 WR-284 1.4
CPS-169 C 3.95-5.85 WR-229 1.4
JPS-169 J 5.85-8.20 WR-137 1.4
XPS-169 X 8.20-12.40 WR-90 1.4
KuPS-169 Ku 12.40-18.00 WR-62 1.4
KPS-169 K 18.00-26.50 WR-42 1.4


It is a four-port waveguide junction consisting of primary main waveguide and a secondary auxiliary waveguide.They can sample a small amount of microwave power for measurement purpose. They are designed to measure incident and reflected power,SWR values, provides a signal path to a receiver or perform other desirable operations. The coupling is done number of holes in a row and the number of Rows according to coupling sector required.Scientific Microwave offers 3dB,10dB & 20dB couplers to its customers with minimum VSWR.


Model for 3dB coupler Model for 10dB coupler Model for 20dB coupler Freq. Range(Ghz) Band VSWR (main line) VSWR (Auxiliary)
SDC-303 SDC-310 SDC-320 2.60-3.95 S 1.2 1.1
CDC-303 CDC-310 CDC-320 3.95-5.85 C 1.2 1.1
JDC-303 JDC-310 JDC-320 5.85-8.20 J 1.2 1.1
XDC-303 XDC-310 XDC-320 8.20-12.40 X 1.2 1.12
KuDC-303 KuDC-310 KuDC-320 12.40-18.00 Ku 1.2 1.12
KDC-303 KDC-310 KDC-320 18.00-26.50 K 1.2 1.12


Horns are open-ended waveguide in which the open end is flared so that it looks llike horn.Commly used horn antennas are pyramidal horn,E-sectorial,H-sectorial horn and the pick up horns.These horns are used to determine the gain of the antena under test by conventional substitution metnos and are also used as general-purpose radiators.They are also used as reference sources in dual channel antenna test receivers and can be used as pick up horns for radiation monitoring.


Model Freq. Range(Ghz) Waveguide TYPE VSWR VSWR
SH-385 2.6-3.95 WR-284 Pyramidal 1.2 15
SH-380 2.6-3.95 WR-284 Pick up 1.2 10
SE-560 2.6-3.95 WR-284 E-sectorial 1.2 15
JH-385 5.85-8.2 WR-137 Pyramidal 1.2 16
JH-380 5.85-8.2 WR-137 Pick up 1.2 10
JH-560 5.85-8.2 WR-137 E-sectorial 1.2 15
JH-561 5.85-8.2 WR-137 H-sectorial 1.2 15
JH-385 8.2-12.4 WR-90 Pyramidal   16
XH-380 8.2-12.4 WR-90 Pick up   10
XE-560 8.2-12.4 WR-90 E-sectorial   15
XH-561 8.2-12.4 WR-90 H-Sectorial   15
KUH-385 12.4-18.0 WR-62 Pyramidal   15
KUH-380 12.4-18.0 WR-62 Pick up   10
KUH-560 12.4-18.0 WR-62 E-sectorial   15
KUH-561 12.4-18.0 WR-62 H-sectorial   15
KH-385 18.0-26.5 WR-42 Pyramidal   20
KH-385 18.0-26.5 WR-42 Pick up   10
KAH-385 26.5-40.0 WR-28 Pyramidal   15


In making measurement on waveguide components it is often desirable to absorb the power propagated down the waveguide. These are designed in such a way to absorb the maximum energy without having reflection assuring low VSWR.


Model Band Freq. Range(Ghz) Waveguide VSWR
STX-127 S 2.60-3.95 WR-284 Fixed
CTX-127 C 3.95-5.85 WR-229 Fixed
JTX-127 J 5.85-8.20 WR-137 Fixed
XTX-127 X 8.20-12.40 WR-90 Fixed
KuTX-127 Ku 12.40-18.00 WR-62 Fixed
KTX-127 K 18.00-26.50 WR-42 Fixed