Band Shifters for LTE

Enabling LTE Network Operation over Private Spectrum

Doodle Labs’ family of LTE Front-End Subsystems (LTE-FES) enable state-of-the-art, high-performance 2×2 MIMO LTE-A equipment to operate in proprietary bands. The LTE-FES acts as a compact, in-line module between the LTE modem and the antenna. The RF signal output operates at a new frequency while existing tools for network and traffic management continue to work without any changes. Many government and commercial organizations around the world have access to swaths of spectrum (e.g., Military, Utilities and Railways) that can be leveraged utilizing off-the-shelf LTE systems combined with our LTE-FES technology.

Features and Design

The LTE-FES is a bi-directional band shifter for 2×2 TDD LTE-A signals. It provides complete transmit and receive paths from radio to antenna with 50 Ohms input/output matched RF ports. The LTE-FES integrates Mixers, LNA, power amps, filters, and auto Tx/Rx direction switching. These modules have been design to offer the smallest size, weight, and power characteristics possible. 

Given the diverse nature of LTE applications, our team configures the modules for each specific project. The LTE-FES design architecture can be factory configured for different RF and the ANT frequency combinations to achieve a vast range of miniature, form-factor compatible models. 

Please contact us to discuss your project requirements.


Technical Specifications (Indicative)
Configurable Frequency Offset Range Max Input to Output frequency offset value ± 4000 MHz with 1 KHz resolution
Operating Mode Bi-Directional TDD, 2×2 MIMO
Tx/Rx Switching Time 1 micro second (Max)
Antenna Port Specifications
Configurable ANT Frequency Range 200~6000 MHz
Max. RF Power Output on Antenna port (Freq Dependent) 30 dBm/stream @ BPSK/16 QAM
24 dBm/stream (@64 QAM)
31 dBm (P1dB)
Tx System Gain Up to 20 dBm fixed gain (Factory configurable), ± 2 dBm
Operating Channel size Upto 20 MHz
Gain Flatness across the channel  ±1 dBm for a 20 MHz wide channel
Error Vector Magnitude (EVM) -30 dB @ 24 dBm
Duty Cycle Max. 70% Tx at 30 dBm output
Transmitter Spurious Emission Suppression -40 dBc (Typical)
Input Signal Level on Antenna port -100 to -30 dBm (Recommended, Absolute Maximum=+20 dBm)
Receiver LNA Gain Up to 10 dB (Factory Configurable)
Receive chain Noise Figure +6 dB
Tx Control for External Power Amp DC biased control signal available on ANT ports
LTE Radio Port Specifications
LTE modem Frequency range 600-6000 MHz
Singal Level from LTE modem 0 dBm to +30 dBm (Factory Configurable)
Physical, Environmental, and Other Specifications
Antenna Ports 4 MMCX Ports. 2x for Radio and 2x for ANT. 50 Ohms.
Integrated Antenna Port Protection >20 KV (Human Body Model), Available on Rugged models
Operating Voltage 6~18 Volts
Power Consumption 12W @ 30 dBm for 2x MIMO stream @ 3 GHz, in data transmit mode (lower DC power @ lower frequency and lower RF power)
2W in data receive mode
Cable Assembly Samples include the cable harness. Cable assembly drawings are available.
Shield case temperature range (Operating) -40°C to +85°C for Extended Mil grade operation
The System’s thermal design should ensure that the LTE-FES shield case temperature is maintained within these specifications.
Humidity (Operating) 0% – 95% (Non-condensing)
Dimensions 80 x 90 x 20 mm, 100 grams (Mechanical drawing and CAD file available upon request)
Regulatory Requirements Formal testing and approval is required based on the Integrator’s particular host platform. The Integrator is also responsible for obtaining any other required regulatory approvals in target markets for the finished product.
Doodle Labs can offer assistance for compliance testing of the System Integrator’s host platform.
RoHS/WEEE Compliance  Yes. 100% Recyclable/Biodegradable packaging

* Specifications are subject to change without prior notice.