Introduction to DBS Band 4 Port TX/RX Linear Polarization Diplexer

The DBS Band 4 Port TX/RX Linear Polarization Diplexer is a passive RF component designed to isolate the transmit and receive signals in satellite communication systems operating in the DBS frequency range. With linear polarization for both TX and RX paths, the diplexer allows efficient separation of the signal channels, ensuring clear, interference-free communication.

Key Technical Specifications

Frequency Range	Tx 17.30-18.40GHz
	Rx 10.70-12.75 GHz
Insertion Loss	Tx ≤0.35dB
	Rx≤0.40 dB
VSWR	Tx ≤1.35
	Rx ≤1.35
Isolation (Port to Port)	Tx/Rx ≥85dB
	Rx/Tx ≥85dB
	Rx/Rx ≥35dB
	Tx/Tx ≥35dB
Power Handling	500W CW PER Tx Port (1KW TOTAL)
Weight	7.5KG APPROXIMATE
Pressure Sealed to 5.0 PSIG
Finish Paint White Color
Interface Tx	WR62 (BJ140) Rx
Remark	Different interfaces can be customized
Unit	millimeter

Advantages and Key Features

The DBS Band 4 Port TX/RX Linear Polarization Diplexer provides several key benefits that make it a vital part of satellite communication systems:

High Isolation: It offers high isolation (≥ 45 dB) between the RX and TX channels, effectively eliminating interference and signal leakage.
Low Insertion Loss: With insertion losses below 0.5 dB, this diplexer reduces signal attenuation, ensuring optimal signal quality and communication efficiency.
Dual Polarization Support: It accommodates both horizontal and vertical linear polarization, making it adaptable for various satellite communication configurations.
Compact and Reliable: Its small size allows for easy integration into different systems, such as satellite communication terminals and broadcast systems.
Durability: Designed to endure extreme environmental conditions, it operates effectively in temperatures ranging from -40°C to +85°C, ensuring reliable performance in outdoor settings.
Customization Options: The diplexer comes with different connector types (N-Type, SMA) and customizable mounting options, allowing it to be tailored to specific installation needs.
High Power Handling: It can handle up to 20 W of continuous power, making it suitable for high-powered satellite applications.

Applications

The DBS Band 4 Port TX/RX Linear Polarization Diplexer is widely used in applications that require reliable separation of transmission and reception channels within the DBS band. Key use cases include: Satellite TV and Broadcast Systems,Direct-to-Home (DTH) Services,Satellite Communication Networks,Broadband and Internet Services,Telemedicine and Remote Communications.

Working Principle

The DBS Band 4 Port TX/RX Linear Polarization Diplexer works by isolating the transmit and receive signals based on their frequencies. Here's how it operates:
The RX port receives signals from satellites operating in the 12.2 GHz - 12.7 GHz frequency range. The TX port handles signals in the 13.75 GHz - 14.5 GHz frequency range, sending them back to the satellite for transmission. The diplexer ensures that the receive and transmit signals do not interfere with each other by using a combination of high isolation and frequency-specific filtering. Linear polarization is applied to the signals, ensuring that the transmitted and received signals are aligned correctly to minimize signal distortion and maximize reception quality.
By effectively isolating the TX and RX channels, the diplexer guarantees a clear, high-quality signal for both uplink and downlink functions, avoiding signal deterioration due to channel interference or overlap.