As UAV communications, private LTE networks, and L-band broadband systems continue to evolve, the 1.4 GHz frequency band (1428–1468 MHz) has become increasingly important for reliable wireless links.

Systems operating in this band often adopt TDD (Time Division Duplexing) and OFDM modulation, both of which impose strict requirements on RF front-end performance—especially power amplifiers.

In this article, we introduce a high-performance 2T2R Bi-Directional Power Amplifier (BDA) designed specifically for these demanding applications.

Here is a client inquiry

I am looking for a Bi-Directional Power Amplifier (BDA) compatible with a 1.4 GHz broadband system that utilizes OFDM modulation and TDD (Time Division Duplexing). To ensure optimal performance, could you please specify the P1dB and Linear Output Power at 1.4 GHz, the RX/TX switching speed in microseconds, and the Noise Figure (NF) of the RX path? Additionally, I would like to know the typical current consumption at maximum output, the required supply voltage, and whether the thermal design is suitable for passive cooling on a mobile UAV platform. My device is 1428-1468 mhz range. My device has two antenna out 10watts. How to use an on/off switch? Only connect ext. PA connection right Do you have a 2T2R device amplifier.

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1. Product Overview

This 1.4 GHz Bi-Directional Amplifier (BDA) is engineered for high-linearity, dual-channel wireless systems.

Key Features:

• Frequency Range: 1428–1468 MHz
• Architecture: 2T2R (2 Transmit / 2 Receive)
• Output Power: 10W per channel
• Duplex Mode: TDD
• Modulation Support: OFDM
• Application: UAV, broadband wireless, tactical communication systems

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2. Why This Amplifier Matters

High Linearity for OFDM Signals

OFDM signals have a high peak-to-average ratio (PAPR), requiring amplifiers to operate in a highly linear region.

• P1dB: ≥ 40 dBm
• Linear Output Power (OFDM): 34–37 dBm
• Ensures low EVM and minimal signal distortion

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Fast TDD Switching Performance

TDD systems require rapid switching between transmit and receive modes.

• RX/TX Switching Time: ≤ 5 µs
• Enables precise timing alignment and reduces packet loss

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Low Noise RX Path

Receiver sensitivity is critical in long-range communication.

• Noise Figure (NF): ≤ 2.5 dB
• Maintains high signal integrity in weak signal conditions

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Efficient Power Consumption

Optimized for mobile and airborne platforms:

• Supply Voltage: 12V / 24V / 28V
• Current Consumption: ~2–4A @ 28V (max output)
• High efficiency reduces thermal stress

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Thermal Design for UAV Applications

• Designed for passive cooling with heatsink
• Suitable for airflow-assisted environments (UAV flight)
• Compact and lightweight

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3. Integration & Usage

RF Connections

• 2 × TX outputs
• 2 × RX inputs
• 50Ω impedance

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External PA Control

• Supports TX Enable (PA_EN) control pin
• Allows fast switching and power management

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Power ON/OFF Options

1. DC Power Switch (Simple Method)
2. GPIO Enable Control (Recommended)

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4. Typical Applications

• UAV data links
• L-band broadband systems
• Emergency communication networks
• Tactical radio systems
• Video transmission platforms

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Full Datasheet

1. General Specifications

Parameter	Specification
Frequency Range	1428 – 1468 MHz
Architecture	2T2R
Duplex Mode	TDD
Modulation	OFDM Compatible
Output Power	10W per channel

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2. Transmitter (TX) Specifications

Parameter	Min	Typical	Max	Unit
Output P1dB	40	41	42	dBm
Linear Output Power (OFDM)	34	35	37	dBm
Gain	30	32	35	dB
Input Return Loss	–	10	–	dB
Output Return Loss	–	10	–	dB

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3. Receiver (RX) Specifications

Parameter	Min	Typical	Max	Unit
Gain	10	15	20	dB
Noise Figure (NF)	–	2.2	2.8	dB
Input Return Loss	–	10	–	dB

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4. TDD Switching Performance

Parameter	Specification
TX to RX Switching Time	≤ 5 µs
RX to TX Switching Time	≤ 5 µs

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5. Electrical Specifications

Parameter	Specification
Supply Voltage	12V / 24V / 28V
Current Consumption	2–4A @ 28V
Power Consumption	~50–100W

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6. Mechanical & Thermal

Parameter	Specification
Cooling Method	Passive (Heatsink)
توص推荐环境	Airflow-assisted (UAV use)
Mounting	Aluminum chassis

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7. Control Interface

Parameter	Specification
PA Enable	TTL / GPIO
TDD Control	External control signal
RF Connector	SMA / Custom

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8. Environmental

Parameter	Specification
Operating Temperature	-20°C to +60°C
Storage Temperature	-40°C to +85°C