Device Overview

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General Description

The MQH-1842 is a MMIC 18GHz – 42 GHz quadrature (90°) hybrid. Passive GaAs MMIC technology allows production of smaller constructions that replace larger form factor circuit board constructions. Tight fabrication tolerances allow for less unit to unit variation than traditional coupler technologies. The MQH-1842 is available as a wire bondable chip. Low unit to unit variation allows for accurate simulations using the provided S4P file taken from measured production units. Applications include single sideband upconverters, image rejection downconverters, IQ modulators, balanced amplifiers, microwave correlators, and microwave Butler matrices.

Download s-parameters here
Photo of MQH-1842CH

Features

  • Designed for K/Ka-band applications
  • High amplitude and phase balance
  • High isolation
  • Low insertion loss

Applications

  • Single Sideband Upconverters
  • Image Rejection Downconverters
  • IQ Modulators
  • Balanced Amplifiers
  • Microwave Correlators
  • Microwave Butler Matrices

Functional Block Diagram

Block Diagram

Part Ordering Options

Part NumberDescriptionPackageGreen StatusProduct LifecycleExport Classification
MQH-1842CHMMIC 18-42GHz Quadrature HybridCH

REACH

RoHS

ReleasedEAR99

Table Of Contents

Revision History

Revision CodeRevision DateComment
-2018-05-01Datasheet Initial Release
A2019-06-01Corrected Port Definitions

Rev: A | Copyright © 2018 - 2019 Marki Microwave LLC.

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Port Configuration and Functions

Port Diagram

A top-down view of the MQH-1842CH package outline drawing is shown below. The MMIC quadrature hybrid are passive reciprocal devices allowing any port to be used as the input.

Diagram of the port configuration for MQH-1842CH

Port Functions

Configuration A

PortFunctionDescriptionDC Equivalent
Circuit
PadGround CH package ground path is provided through the substrate and ground bond pads.Equivalent circuit for the Ground
Port 1Input Port 1 is DC short to port 3 and open to ground.Equivalent circuit for the Input
Port 290° Output Port 2 is DC short to port 4 and open to ground.Equivalent circuit for the 90° Output
Port 30° Output Port 3 is DC short to port 1 and open to ground.Equivalent circuit for the 0° Output
Port 4Isolated Port 4 is DC short to port 2 and open to ground.Equivalent circuit for the Isolated

Rev: A | Copyright © 2018 - 2019 Marki Microwave LLC.

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Configuration B

PortFunctionDescriptionDC Equivalent
Circuit
PadGround CH package ground path is provided through the substrate and ground bond pads.Equivalent circuit for the Ground
Port 190° Output Port 1 is DC short to port 3 and open to ground.Equivalent circuit for the 90° Output
Port 2Input Port 2 is DC short to port 4 and open to ground.Equivalent circuit for the Input
Port 3Isolated Port 3 is DC short to port 1 and open to ground.Equivalent circuit for the Isolated
Port 40° Output Port 4 is DC short to port 2 and open to ground.Equivalent circuit for the 0° Output

Rev: A | Copyright © 2018 - 2019 Marki Microwave LLC.

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Configuration C

PortFunctionDescriptionDC Equivalent
Circuit
PadGround CH package ground path is provided through the substrate and ground bond pads.Equivalent circuit for the Ground
Port 10° Output Port 1 is DC short to port 3 and open to ground.Equivalent circuit for the 0° Output
Port 2Isolated Port 2 is DC short to port 4 and open to ground.Equivalent circuit for the Isolated
Port 3Input Port 3 is DC short to port 1 and open to ground.Equivalent circuit for the Input
Port 490° Output Port 4 is DC short to port 2 and open to ground.Equivalent circuit for the 90° Output

Rev: A | Copyright © 2018 - 2019 Marki Microwave LLC.

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Configuration D

PortFunctionDescriptionDC Equivalent
Circuit
PadGround CH package ground path is provided through the substrate and ground bond pads.Equivalent circuit for the Ground
Port 1Isolated Port 1 is DC short to port 3 and open to ground.Equivalent circuit for the Isolated
Port 20° Output Port 2 is DC short to port 4 and open to ground.Equivalent circuit for the 0° Output
Port 390° Output Port 3 is DC short to port 1 and open to ground.Equivalent circuit for the 90° Output
Port 4Input Port 4 is DC short to port 2 and open to ground.Equivalent circuit for the Input

Rev: A | Copyright © 2018 - 2019 Marki Microwave LLC.

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Specifications

Absolute Maximum Ratings

The Absolute Maximum Ratings indicate limits beyond which damage may occur to the device. If these limits are exceeded, the device may be inoperable or have a reduced lifetime.

ParameterMaximum RatingUnit
Maximum Operating Temperature 100°C
Maximum Storage Temperature 125°C
Minimum Operating Temperature -55°C
Minimum Storage Temperature -65°C

Package Information

ParameterDetailsRating
Dimensions-2.28 x 1.25 mm

Rev: A | Copyright © 2018 - 2019 Marki Microwave LLC.

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Electrical Specifications

The electrical specifications apply at TA=+25°C in a 50Ω system. Min and Max limits are guaranteed at TA=+25°C.

ParameterPort ConfigurationTest ConditionsMinimum
Frequency
(GHz)		 Maximum
Frequency
(GHz)		MinTypMaxUnit
Amplitude Balance --18 42-1.52.5dB
Excess Insertion Loss --18 42-1.53dB
Impedance --- --50-Ω
Isolation --18 42815-dB
Mean Coupling --18 42-3-dB
Nominal Phase Shift --18 42-90-°
Phase Balance --18 42-412°
VSWR --18 42-1.5-

Quadrature hybrid is reciprocal. Reverse measurement is equivalent to forward measurement.

Rev: A | Copyright © 2018 - 2019 Marki Microwave LLC.

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Typical Performance Plots

Insertion Loss, Return Loss, and Isolation

Insertion Loss (dB) graph for MQH-1842CH
Return Loss/Isolation (dB) graph for MQH-1842CH

Rev: A | Copyright © 2018 - 2019 Marki Microwave LLC.

9

Amplitude and Phase Balance

Amplitude Differential (dB) graph for MQH-1842CH
Phase Differential (Degree) graph for MQH-1842CH

Rev: A | Copyright © 2018 - 2019 Marki Microwave LLC.

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Mechanical Data

Outline Drawing

Download : Outline 2D Drawing

Outline Drawing

Rev: A | Copyright © 2018 - 2019 Marki Microwave LLC.

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