How many antenna modules does a 5G smartphone need?

A 5G mmWave smartphone typically uses 3-4 antenna modules placed along different edges of the device. This is necessary because mmWave signals are blocked by the human hand, head, and body. Each module has a 4x1 or 2x2 antenna array with approximately ±60° beam steering range. With modules on 3-4 edges, the phone maintains coverage in most holding orientations. The modem dynamically selects the best module based on beam quality measurements. This multi-module approach consumes 2-4W when active in mmWave mode, which is why mmWave is typically activated only when needed (e.g., high throughput demand).

What are typical specifications for a 5G antenna module?

UE module (e.g., Qualcomm QTM535): 4 antenna elements, EIRP 23 dBm, beam scanning ±60°, size 15x15x2 mm, n257/n258/n260/n261 bands. Base station module (small cell): 64-256 elements, EIRP 55-65 dBm, beam scanning ±60° azimuth / ±30° elevation, 4-8 independent beams. CPE/FWA module: 16-64 elements, EIRP 35-43 dBm, fixed or limited beam steering. Key challenges: thermal management (3-5W per module in a phone), package warpage at mmWave wavelengths, and consistent beam pattern across manufacturing tolerances.

mmWave & 5G

5G Antenna Module

Q: What is Antenna-in-Package (AiP)?

AiP integrates the antenna elements directly into or onto the IC package substrate, eliminating the need for external antennas and RF connectors. At mmWave frequencies (28/39 GHz), antenna elements are small enough (approximately 5 mm at 28 GHz) to be fabricated as patch arrays on the package substrate. The beamforming IC sits beneath the antenna array, with controlled-impedance interconnects (no cables). This reduces insertion loss by 1-2 dB compared to cabled solutions and enables very compact modules (15x15x2 mm for a 4-element UE module). Qualcomm's QTM525/535 and Samsung's Exynos mmWave modules use AiP technology.

An integrated package combining phased array antenna elements, beamforming ICs with per-element phase shifters, power amplifiers, low-noise amplifiers, and frequency conversion into a single compact module for mmWave 5G (FR2) operation at 24 to 71 GHz. The Antenna-in-Package (AiP) approach integrates antenna elements directly on the IC package substrate, enabling electronic beam steering in devices as small as smartphones while maintaining 23+ dBm EIRP.

Category: mmWave & 5G

Technology: Antenna-in-Package (AiP)

Frequency: 24-71 GHz (FR2)

Understanding 5G Antenna Modules

At mmWave frequencies, traditional cable-connected antennas introduce unacceptable insertion loss (1-3 dB per connector). The solution is to integrate everything: antenna, amplifier, phase shifter, and mixer into a single module. At 28 GHz, a half-wavelength patch antenna is only ~5 mm, small enough to fabricate directly on the package substrate.

The beamforming IC sits beneath the antenna array, driving each element with independently controllable phase and amplitude. This enables electronic beam steering over ±60° without mechanical parts. The module handles all mmWave RF processing; only IF or baseband signals (and power/control) connect to the main board.

5G Antenna Module Parameters

UE module (smartphone):
Elements: 4 (1×4 or 2×2), EIRP: 23 dBm
Size: ~15×15×2 mm, Beam: ±60°
Modules per phone: 3-4 (multi-edge coverage)

Small cell / CPE module:
Elements: 16-64, EIRP: 35-55 dBm
Size: ~50×50×5 mm, Beams: 2-8 simultaneous

Base station AAU:
Elements: 256-1024, EIRP: 55-65 dBm
Beam: ±60° az / ±30° el

Thermal: 2-5W per UE module. Key design challenge for smartphones.

5G Antenna Module Implementations

Module	Elements	EIRP	Bands	Application
Qualcomm QTM535	4	23 dBm	n257/258/260/261	Smartphone
Samsung Exynos mmW	4	23 dBm	n257/261	Smartphone
Anokiwave AWMF-0158	64	50 dBm	n257/258	Small cell / CPE
Ericsson AIR 5322	512	60+ dBm	n258/261	Macro base station

Common Questions

Frequently Asked Questions

What is Antenna-in-Package?

AiP fabricates antenna elements directly on the IC package substrate, eliminating external antennas and cables. Saves 1-2 dB insertion loss. Elements are ~5 mm at 28 GHz, fitting in a 15×15 mm package. Used in all major smartphone mmWave modules.

Why 3-4 modules per phone?

mmWave is blocked by hands, head, and body. Multiple modules on different edges ensure coverage in most holding orientations. The modem dynamically selects the best module. Multi-module adds 2-4W power consumption.

What are typical specs?

UE: 4 elements, 23 dBm EIRP, ±60° scan, 15×15×2 mm. Base station: 256-1024 elements, 55-65 dBm EIRP, ±60°/±30°. Key challenges: thermal management, package warpage, and manufacturing tolerances.

Related Terms

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