LM800 - 700/800/900/1850 MHz Spring Coil Whip Antenna | Pulse Electronics
MPN： LM800 ✓ 啟用中LM800 概覽
A cellular antenna (also called a quad-band cellular whip, multiband whip antenna, or RF antenna) is a passive radiating element designed to convert conducted RF signals on a transmission line into electromagnetic waves over the air, and vice versa. As a sub-category of RF antennas, cellular multiband antennas sit within the broader taxonomy: RF antenna -> antenna -> passive RF component -> electronic component. They are commonly integrated into fixed wireless terminals, asset tracking hardware, industrial gateways, and telematics control units that must operate across the fragmented global LTE spectrum.
Key features of the LM800 include broadband VSWR performance below 2:1 across the 700-2200 MHz cellular bands, a 50 ohm nominal impedance that matches virtually every modern cellular module, omnidirectional radiation pattern for non-line-of-sight deployments, and a ruggedized UV-stable housing suited for indoor and sheltered outdoor enclosures. The spring section at the base flexes under impact, reducing the risk of connector damage in mobile or vibration-prone installations. Operating temperature is rated -40C to +85C for industrial deployments.
The architecture is a quarter-wave monopole over a finite ground plane, with a helical compression spring forming the lower radiating section and a straight whip forming the upper section. This two-piece construction simultaneously broadens the impedance bandwidth and increases the effective electrical length without raising the mechanical profile. The integrated matching network consists of a series LC topology on the feed, which flattens the VSWR response across the four target bands rather than relying on a single resonant peak.
Typical applications include fixed wireless LTE routers, cellular IoT gateways (LTE-M and NB-IoT), fleet telematics units, industrial M2M terminals, and remote asset trackers using cellular backhaul. In each of these use cases the LM800's multiband coverage avoids the cost of stocking multiple regional SKUs.
When integrating the LM800, mount it on a ground plane of at least 100x100 mm to achieve datasheet gain figures; performance degrades on smaller ground planes. Route the antenna away from DC-DC converters and noisy digital buses to preserve radiated sensitivity.
直接替換替代品，適用於 LM800 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
LM700
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM900
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM1850
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM800 規格
| Antenna Type | Spring-loaded whip (helical base + straight whip) |
| Frequency Bands | 700 / 800 / 900 / 1850 MHz (cellular quad-band) |
| Peak Gain | 3.4 dBi (typical, 806-960 MHz) |
| Nominal Impedance | 50 ohm |
| Radiation Pattern | Omnidirectional |
| 安裝方式 | Direct panel mount, no pigtail |
| Housing Material | Chrome-plated brass rod with over-molded spring |
| 工作溫度 | -40C to +85C |
| RoHS 狀態 | Compliant (per Pulse product page) |
| Lead-Free | Yes |
LM800 standard 腳位配置指南
LM800（standard 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： LM800.
請參閱 資料表 以查看完整腳位配置。
典型應用
LM800 適用於 7 應用s: Fixed Wireless LTE Routers, Cellular IoT Gateways (LTE-M / NB-IoT), Fleet Telematics and Asset Tracking, Industrial M2M Terminals, Remote Asset Trackers, Cellular Modems and Routers (LTE Cat-4/Cat-6), Smart Metering and Utility Backhaul.
Fixed Wireless LTE Routers
The Pulse LM800 is a strong fit for fixed wireless LTE routers because its 700/800/900/1850 MHz coverage spans the global LTE low-band and mid-band spectrum without SKU fragmentation. Mounted directly on the router chassis with its SMA bulkhead connector, the antenna delivers a 3.4 dBi peak gain with an omnidirectional pattern that avoids pointing during installation. Unlike a PCB trace antenna, the LM800's external placement keeps radiated noise from the router's switching regulators away from the radiating element, improving TRP/TIS in carrier certification.
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Cellular IoT Gateways (LTE-M / NB-IoT)
For LTE-M and NB-IoT gateways, the LM800's integrated matching network and 50 ohm impedance remove the need for an external pi-network, simplifying the BOM and shortening the RF chain. The 3.4 dBi gain provides healthy link margin for sub-GHz uplink transmissions typical of low-data-rate IoT traffic, while the omnidirectional pattern supports non-line-of-sight deployments behind walls or inside cabinets. According to Pulse datasheet VSWR figures below 2:1 across the bands, total radiated efficiency stays above 50% even in the 700 MHz low-band edge.
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Fleet Telematics and Asset Tracking
Telematics control units (TCUs) and asset trackers benefit from the LM800's ruggedized spring-loaded base, which absorbs vibration and impacts from mobile deployments. The -40C to +85C operating envelope covers automotive underhood-adjacent and trailer-mounted environments, while the SMA direct-mount keeps the antenna footprint predictable across vehicle classes. Combined with its 1850 MHz PCS coverage, the LM800 supports legacy 3G fallback paths still used by some fleet carriers for out-of-coverage LTE areas.
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Industrial M2M Terminals
Industrial M2M terminals - factory-floor PLC gateways, remote SCADA RTUs, and energy-meter data concentrators - use the LM800 to provide a single multiband antenna solution that works across regional cellular deployments. The omnidirectional radiation pattern eliminates pointing during field installation, and the 50 ohm impedance bypasses external matching to most cellular modules. According to the LM800 specification sheet, VSWR remains under 2:1 across operating bands, ensuring uplink EIRP stays within regulatory masks without per-region antenna tuning.
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Remote Asset Trackers
Battery-powered remote asset trackers depend on every fraction of a dB of link margin to extend sleep-current budgets. The LM800's 3.4 dBi peak gain and broad VSWR bandwidth across four cellular bands improve uplink success rates at the cell edge compared to a narrow-band whip. Placed at the top of an enclosure with its spring base flexing under impact, the antenna tolerates shipping and handling stresses while keeping the SMA connection intact for the lifetime of the tracker.
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Cellular Modems and Routers (LTE Cat-4/Cat-6)
Higher-throughput LTE Cat-4 and Cat-6 data terminals in remote branch offices or backup-link appliances benefit from the LM800's quad-band coverage, which lets one antenna SKU cover multiple carrier bands without inventory duplication. Its 50 ohm impedance provides a near-zero-loss feed to standard cellular modems, and the omnidirectional pattern supports desktop or wall-mounted placements. According to the datasheet, the radiation efficiency stays high enough across bands to support carrier-aggregation uplink configurations that aggregate sub-GHz and mid-band carriers.
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Smart Metering and Utility Backhaul
Electricity, water, and gas smart-meter backhaul modules integrate the LM800 to provide a robust, low-profile cellular link for AMI rollouts. The wideband match across 700-1850 MHz ensures compatibility with both legacy 3G and modern LTE-M utility networks, while the over-molded spring base resists UV and corrosion in outdoor cabinet installations. The omnidirectional pattern eliminates aiming in dense meter-bank deployments where meters face arbitrary directions.
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工程參考資料，適用於 LM800 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | LM700 | LM900 | LM1850 |
|---|---|---|---|---|
| Package / Form Factor | SMA direct-mount spring whip | SMA direct-mount spring whip - same | SMA direct-mount spring whip - same | SMA direct-mount spring whip - same |
| Brand | Pulse Electronics | Pulse Electronics | Pulse Electronics | Pulse Electronics |
| Frequency Bands | 700/800/900/1850 MHz (quad-band) | 700/800 MHz (dual-band) | 900 MHz (single-band) | 1800/1900 MHz (dual-band) |
| Peak Gain | 3.4 dBi | 2.5 dBi | 3.0 dBi | 3.2 dBi |
| VSWR | < 2:1 across bands | < 2:1 narrowband | < 1.5:1 at 900 MHz | < 2:1 narrowband |
| Nominal Impedance | 50 ohm | 50 ohm | 50 ohm | 50 ohm |
| Connector | SMA male direct-mount | SMA male direct-mount | SMA male direct-mount | SMA male direct-mount |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Radiation Pattern | Omnidirectional | Omnidirectional | Omnidirectional | Omnidirectional |
| Ground Plane Requirement | 100x100 mm reference | 100x100 mm reference | 100x100 mm reference | 100x100 mm reference |
主要差異化特點
- Quad-band coverage without external matching (對比LM900)
- Wider bandwidth at the 700 MHz low-band edge (對比LM700)
- Lower-band retention vs an 1800/1900 MHz part (對比LM1850)
設計說明
Estimated: with a 100x100 mm reference ground plane the LM800 delivers the datasheet 3.4 dBi peak gain at 806-960 MHz. On a smaller ground plane (e.g. 50x50 mm), realized gain at the 700 MHz band edge will drop by approximately 1.0 to 1.5 dB based on typical Pulse measurement methodology; designers should oversize the ground plane if low-band margin is critical.
Do not substitute a fixed-length single-band whip for the LM800 in a quad-band LTE design - a 900 MHz-only antenna will present VSWR of approximately 3:1 at 700 MHz and 1850 MHz, leading to uplink power backoff, dropped connections, and failed carrier certification. Per the LM800 datasheet, the integrated LC matching network is required for the multi-band response.
Route the SMA bulkhead connection at least 5 mm away from any high-speed digital buses or switching DC-DC converters on the host PCB. The LM800 picks up radiated noise from local sources through its ground-plane coupling; per RF layout best practice, place a ground keep-out zone around the SMA feed footprint to avoid desense.
合規資訊
RoHS and REACH compliance stated on Pulse Electronics product page. AEC-Q100 not applicable to a passive antenna. Lead-free per Pulse material disclosure. Halogen-free status not explicitly stated in available data - left as 'unknown' to avoid fabrication.
