Product Description
Mi-Wave’s 640 Series E-Plane Tees are block-style waveguide components designed to divide RF power into two equal output signals with an opposite-phase relationship. Each tee consists of a length of standard flanged waveguide with a perpendicular E-plane coupling arm symmetrically positioned on the broad waveguide wall.
When input power is applied to the coupling arm, the signal is divided equally between the two main output ports. Unlike H-plane tees, the two output signals are 180 degrees out of phase, making E-plane tees useful in applications where phase opposition, signal comparison, or differential behavior is required.
The 640 Series is available in standard waveguide sizes from 12.4 GHz to 110 GHz. Because these tees use unmatched junctions, they are not recommended for applications requiring low VSWR or precision impedance matching.
The standard models shown represent only part of Mi-Wave’s broader product capabilities. Custom configurations are available to support specific frequency bands, interfaces, and application requirements, enabling optimized solutions for specialized RF, microwave, and millimeter-wave systems.
*Actual product may be different from the image shown per customers specifcations
*All data presented is collected from a sample lot.
* Actual data may vary unit to unit, slightly.
*All testing was performed under +25 °C case temperature.
*Consult factory to confirm if material, plating, size, shape, orientation and any electrical parameter is critical for the application as website information is for reference only.
*Millimeter Wave Products, Inc. reserves the right to change the information presented on website without notice as we continue to enhance the performance and design of our products.
| Model No. | A (in.) | A (mm) | B (in.) | B (mm) | Weight (oz) |
|---|---|---|---|---|---|
| 640Ku | 2.5 | 63.5 | 1.25 | 31.75 | 3.7 |
| 640K | 2.4 | 60.96 | 1.2 | 30.48 | 3.7 |
| 640A | 2.4 | 60.96 | 1.2 | 30.48 | 3.7 |
| 640B | 2.4 | 60.96 | 1.2 | 30.48 | 3.4 |
| 640U | 2.4 | 60.96 | 1.2 | 30.48 | 3.2 |
Features & Performance Characteristics
Opposite-Phase Power Division
The 640 Series splits input RF power into two equal output signals that are 180 degrees out of phase. This defined phase relationship makes E-plane tees useful for RF comparison, cancellation, and phase-sensitive measurement applications.
E-Plane Waveguide Junction
The coupling arm is located on the broad wall of the waveguide, creating an E-plane junction. This geometry determines the opposite-phase behavior of the two main output ports.
Standard Flanged Waveguide Construction
Each unit uses standard flanged waveguide construction for straightforward integration into existing waveguide assemblies, test benches, and laboratory systems.
Frequency Coverage from 12.4 to 110 GHz
The 640 Series is available across standard microwave and millimeter-wave waveguide sizes, supporting applications from 12.4 GHz to 110 GHz.
Unmatched Junction Design
The 640 Series uses an unmatched junction, meaning some reflections may occur at the tee intersection. These components are best suited for general power division and test applications where very low VSWR is not required.
How E & H Plane Tees Work
Waveguide tees operate by creating a junction where RF energy entering one port is divided into two output paths. The physical orientation of the junction determines whether the output signals are in phase or out of phase.
In an E-plane tee, the branch is placed along the broad wall of the rectangular waveguide, aligned with the electric field plane. This geometry causes the signal at the two main output ports to split equally but with opposite polarity, producing a 180-degree phase difference between the outputs.
In an H-plane tee, the branch is placed along the narrow wall of the rectangular waveguide, aligned with the magnetic field plane. This geometry splits the input power into two equal signals that remain in phase at the output ports.
Because the junction is not internally matched, some reflections can occur at the tee intersection. For this reason, E-plane and H-plane tees are best suited for general power division, test setups, and non-critical VSWR applications rather than precision-matched signal networks.
Applications
Opposite-Phase Signal Splitting
E-plane tees are used when a single waveguide signal needs to be split into two equal outputs with a 180-degree phase difference.
RF Test and Measurement
The 640 Series is useful in laboratory systems where engineers need to compare signals, observe phase relationships, or route waveguide power into two measurement paths.
Microwave and mmWave Subassemblies
These tees can be integrated into larger waveguide subsystems where compact branching and defined phase behavior are required.
Phase-Sensitive Experiments
Because the output signals are opposite in phase, E-plane tees are useful for cancellation studies, differential measurements, and phase-based RF testing.
General Waveguide Power Division
The 640 Series provides a simple, practical way to divide RF power in rectangular waveguide systems across microwave and millimeter-wave bands.
Frequently Asked Questions (FAQ)
What is an E-plane tee?
An E-plane tee is a waveguide component with a perpendicular coupling arm located on the broad wall of the waveguide. It divides input power equally between two output ports with the outputs in opposite phase.
What is the frequency range of the 640 Series?
The 640 Series E-Plane Tees are available in standard waveguide sizes from 12.4 GHz to 110 GHz.
Are the two outputs in phase?
No. The two outputs are equal in amplitude but 180 degrees out of phase.
Are 640 Series E-Plane Tees matched?
No. The 640 Series uses unmatched junctions and is not recommended for applications requiring low VSWR.
What are E-plane tees used for?
They are used for opposite-phase power division, RF test setups, signal comparison, waveguide routing, and phase-sensitive microwave or millimeter-wave experiments.
What is the difference between an E-plane tee and an H-plane tee?
An E-plane tee produces two equal outputs that are opposite in phase, while an H-plane tee produces two equal outputs that are in phase.
E & H Plane Tee Calculators
These calculators help estimate equal power split, output phase relationships, insertion loss impact, and VSWR to return loss for E-plane and H-plane waveguide tee applications.
Equal Power Split Calculator
Estimate output power at each port for an ideal 3 dB split.
Split with Insertion Loss
Estimate output power per port after ideal split and insertion loss.
Total Output Power
Estimate combined total power from two equal output ports.
E-Plane Phase Relationship
Shows the output phase relationship for an E-plane tee.
H-Plane Phase Relationship
Shows the output phase relationship for an H-plane tee.
VSWR to Return Loss
Convert VSWR to return loss to evaluate mismatch at a waveguide junction.
Glossary of E & H Plane Tee Terms
Waveguide Tee
A waveguide component that divides or combines RF energy through a branch junction.
E-Plane Tee
A waveguide tee with a branch junction on the broad wall of the waveguide. It produces equal output signals that are opposite in phase.
H-Plane Tee
A waveguide tee with a branch junction on the narrow wall of the waveguide. It produces equal output signals that are in phase.
Power Division
The process of splitting input RF power into two or more output paths.
In-Phase Signals
Signals that have the same phase relationship and reach their peaks and nulls at the same time.
Opposite Phase
A 180-degree phase difference between two signals, meaning one signal reaches its positive peak while the other reaches its negative peak.
Waveguide Junction
The point where waveguide paths meet or branch.
Unmatched Junction
A junction that is not internally optimized for minimum reflection, often resulting in higher VSWR than matched components.
VSWR
Voltage Standing Wave Ratio, a measure of impedance matching and reflected power.
Rectangular Waveguide
A hollow metallic transmission line used to guide microwave and millimeter-wave energy.
Broad Wall
The wider wall of a rectangular waveguide, associated with the E-plane tee junction.
Narrow Wall
The smaller wall of a rectangular waveguide, associated with the H-plane tee junction.
