Device Overview

General Description

The DPX-0508 is a broadband low pass/high pass diplexer capable of multiplexing low frequency (DC-5 GHz) and high frequency (8-18 GHz) signals. The novel design offers extremely low insertion loss for both the low pass and high pass channels. The DPX-0508 is an excellent solution for applications such as high frequency/baseband signal routing (especially following a broadband high frequency mixing stage), low loss power splitting/combination, separation of harmonic tones, and general-purpose lab use.

Photo of DPX-0508

Features

  • Broadband performance
  • Low insertion loss
  • High isolation between low pass and high pass ports
  • Lightweight, compact design

Applications

  • Reflectionless Filter Applications
  • RF Transceivers

Functional Block Diagram

Block Diagram

Part Ordering Options

Part NumberDescriptionConnectorsGreen StatusProduct LifecycleExport Classification
DPX-0508Broadband DiplexerStandard

Non-RoHS

ReleasedEAR99

Table Of Contents

Revision History

Revision CodeRevision DateComment
-2012-02-09Datasheet Initial Release

Rev: - | Copyright © 2012 Marki Microwave LLC.

2

Port Configuration and Functions

Port Diagram

Diagram of the port configuration for DPX-0508

Port Functions

PortFunctionConnector TypeDescriptionDC Equivalent
Circuit
Port 1RF High Band SMAFPort 1 is DC open to Port 2 and short to Port 3.Equivalent circuit for the RF High Band
Port 2Common/Input SMAFPort 2 is DC open to Port 1 and Port 3.Equivalent circuit for the Common/Input
Port 3RF Low Band SMAFPort 3 is DC open to Port 1 and short to Port 2.Equivalent circuit for the RF Low Band

Rev: - | Copyright © 2012 Marki Microwave LLC.

3

Specifications

Package Information

ParameterDetailsRating
Weight-28g
Dimensions-20.32 × 45.72 mm

Rev: - | Copyright © 2012 Marki Microwave LLC.

4

Electrical Specifications

Specifications guaranteed from -55 to +100°C, measured in a 50Ω system.

ParameterTest ConditionsMinimum
Frequency
(GHz)
Maximum
Frequency
(GHz)
MinTypMaxUnit
1 dBc High Passband Temp = 25°C
- -7.31--GHz
3 dBc High Passband Temp = 25°C
- -6.91--GHz
30 dBc High Pass Rejection Point Temp = 25°C
- -5.16--GHz
High Passband Return Loss Temp = 25°C
- --15-dB
High Pass Isolation Temp = 25°C
- --33-dB
High Pass Group Delay Temp = 25°C
- --301-ps
1 dBc Low Passband Temp = 25°C
- ---5.71GHz
3 dBc Low Passband Temp = 25°C
- ---5.96GHz
30 dBc Low Pass Rejection Point Temp = 25°C
- ---6.78GHz
Low Passband Return Loss Temp = 25°C
- --18-dB
Low Pass Isolation Temp = 25°C
- --27-dB
Low Pass Group Delay Temp = 25°C
- --477-ps
Crossover Isolation Temp = 25°C
- --23-dB
Crossover Frequency Temp = 25°C
- --6.21-GHz
Common Port Return Loss Temp = 25°C
- --13-dB
Impedance Temp = 25°C
- --50-Ω
30 dBc Low Pass Rejection Point DC-5 GHz
0 52540-dB
Common Port Return Loss 8-18 GHz
8 18812-dB
High Pass Filter, Pass Band Insertion Loss 8-18 GHz
8 18-1-dB
High Pass Filter, Pass Band Return Loss 8-18 GHz
8 18812-dB
Impedance -- --50-Ω
Isolation 8-18 GHz
8 183045-dB
Low Pass Filter, Pass Band Insertion Loss DC-5 GHz
0 5-1-dB
Low Pass Filter, Pass Band Return Loss DC-5 GHz
0 51216-dB
Low Pass Filter, Stop Band Rejection 8-18 GHz
8 183045-dB
RF Power -- ---1W
1 dBc High Passband -- -8-18GHz
1 dBc Low Passband -- -0-5GHz
Common Port Return Loss DC-5 GHz
0 51216-dB
Isolation DC-5 GHz
0 52540-dB

Rev: - | Copyright © 2012 Marki Microwave LLC.

5

Rev: - | Copyright © 2012 Marki Microwave LLC.

6

Typical Performance Plots

Insertion Loss (dB) graph for DPX-0508
Return Loss (dB) graph for DPX-0508
Isolation (dB) graph for DPX-0508
Common Port Return Loss (dB) graph for DPX-0508

Rev: - | Copyright © 2012 Marki Microwave LLC.

7

Mechanical Data

Rev: - | Copyright © 2012 Marki Microwave LLC.

8