Forefront RF, a Cambridge-based semiconductor firm, has introduced what it describes as the industry’s first commercially available low-band tunable duplexer module - marking a potential shift in the design of radio-frequency (RF) front ends for mobile and connected devices.
The FFM51010 is built without traditional surface acoustic wave (SAW) or bulk acoustic wave (BAW) filters. Instead, it uses the company’s patented Adaptive Passive Cancellation technology, branded Foretune, to manage transmitter and receiver signals within a single configurable module.
Modern smartphones, wearables and IoT devices typically rely on a large number of discrete duplexers and filters, each tailored to a specific frequency band. As operators open additional spectrum to meet rising data demand, manufacturers face mounting RF complexity, larger component counts and limited space in compact devices.
Forefront RF says the FFM51010 tackles these challenges by generating an inverted version of the transmitter’s leakage signal and cancelling it at the receiver input in real time, an approach likened to noise-cancelling headphones. The company claims this allows a single tunable module to replace multiple fixed-band components without compromising linearity or stability.
Key Specifications
- Receive range: 612 - 960 MHz
- Transmit range: 663 - 915 MHz
- Channel bandwidth: 1.4 - 20 MHz (wider bandwidths planned)
- Tunable duplex spacing: –46 MHz to +55 MHz
- Supported bands: 5, 8, 12, 13, 14, 17, 18, 19, 20, 26, 28, 71, 85, 105
- Integrated components: multi-mode power amplifier, low-noise amplifier, bidirectional antenna-port RF coupler
- External duplexers: not required
- Interface: single MIPI RFFE v3.0
- Package: 6.0 × 4.5 × 0.75 mm
The module supports both Average Power Tracking (APT) and Envelope Tracking (ET) power architectures and is aimed at 4G LTE, 5G NR and 5G RedCap devices, particularly those using single-antenna designs.
This initial release is focused on low-band spectrum. Forefront RF plans to extend the Foretune architecture into mid-band and high-band solutions in future product generations.
Forefront RF is talking about this product at Mobile World Congress (MWC) in Barcelona this week. Click here to view MWC 2026 Coverage on everything RF.
