LM825 - 3.4 dBi Magnetic Whip RF Antenna | Pulse Electronics
부품 번호: LM825 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $17.5 | $17.50 |
| 10 | $15.2 | $152.00 |
| 100 | $12.8 | $1,280.00 |
| 500 | $10.95 | $5,475.00 |
| 1,000 | $9.4 | $9,400.00 |
LM825 개요
An RF antenna is the radiating element at the front end of any wireless system that converts guided radio-frequency energy on a transmission line into free-space electromagnetic waves (and vice versa on receive). Antennas are characterized by their radiation pattern, gain (in dBi referenced to an isotropic radiator), frequency band, VSWR, polarization, and physical mounting style. Whip antennas with magnetic bases occupy a specific niche: the magnetic base provides a low-impedance counterpoise on metal surfaces, allowing the whip to radiate efficiently without a ground plane being built into the antenna itself. This makes them ideal for prototyping, vehicular installs, and field testing where a permanent mount is not desired.
Key features of the LM825 include its wide multi-band frequency response covering cellular 824-894 MHz, 1850-1990 MHz, and 2.4/5 GHz bands, a flexible whip section that resists breakage, and a robust magnetic base. The whip design produces an approximately omnidirectional radiation pattern in the azimuth plane when mounted on a sufficient ground plane, which simplifies placement on vehicles or equipment enclosures. The 50 ohm nominal impedance matches standard cellular and Wi-Fi radio modules without requiring an external matching network.
In the underlying electrical architecture, the LM825 is a passive radiating element without active electronics; its gain and bandwidth are set by the mechanical geometry of the whip and the base loading coil. The magnetic base itself is part of the counterpoise return path: placing the antenna on a metal plate larger than approximately 30 cm in any direction significantly improves VSWR and radiation efficiency compared to placement on a small metal surface. The datasheet gain figure (3.4 dBi peak) is measured with a standard reference ground plane.
Typical applications include cellular LTE/Cat-M/NB-IoT modems and routers, vehicle fleet telematics units, industrial IoT gateways, 2.4 GHz Wi-Fi and Bluetooth test setups, and temporary cellular signal surveys. The magnetic base also makes the antenna useful for bench characterization of wireless modules where a permanent antenna footprint is undesirable.
When selecting an antenna, consider the minimum required ground-plane size for the magnetic base: small metal surfaces reduce efficiency below 800 MHz. For permanent installations, an NMO-mount or through-hole antenna typically provides better long-term reliability than a magnetic mount.
This page synthesizes distributor pricing, application guidance, and cross-vendor antenna alternatives not consolidated in the manufacturer datasheet.
드롭인 대체품: LM825 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
W1047
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
W1063
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
TG.30.8113
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
TG.35.8113
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LM825 사양
| Product Type | RF Antenna |
| Style | Whip, straight, magnetic mount |
| Frequency Bands | 824-894 MHz / 1850-1990 MHz / 2.4-2.5 GHz / 4.9-5.8 GHz |
| Peak Gain | 3.4 dBi |
| Impedance | 50 ohm |
| Polarization | Linear, vertical |
| Radiation Pattern | Omnidirectional |
| 동작 온도 | -40C to +85C |
| 장착 스타일 | Magnetic base (temporary) |
| RoHS 상태 | Compliant |
| Application | Cellular, ISM, Wi-Fi, IoT |
LM825 standard 핀 구성 가이드
LM825(standard 패키지)의 핀 구성입니다. 핀 번호, 기능, 연결 다이어그램은 제조사 데이터시트에 정의되어 있습니다. 정확한 풋프린트와 솔더링 지침은 해당 문서를 참조하십시오.
다음에 대한 상세 핀아웃 데이터 없음: LM825.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
LM825 적합 용도: 6 애플리케이션s: Cellular LTE/Cat-M/NB-IoT Gateways, Vehicle Fleet Telematics Units, Industrial IoT Gateways with Wi-Fi Backhaul, Bench Testing and Wireless Module Characterization, Temporary Cellular Signal Surveys, Smart Home and Consumer IoT Prototyping.
Cellular LTE/Cat-M/NB-IoT Gateways
The Pulse LM825 magnetic whip antenna is well matched to cellular LTE, Cat-M, and NB-IoT gateway applications where 824-894 MHz and 1850-1990 MHz coverage is mandatory. The 3.4 dBi peak gain provides reliable signal acquisition for fixed-wireless gateways, while the magnetic base eliminates the need for a permanent antenna cutout in the enclosure. Placed on top of the gateway chassis on a flat ferrous surface, the LM825 achieves an omnidirectional azimuth pattern suitable for non-line-of-sight cellular coverage. Compared to a permanent NMO mount, the magnetic base reduces installation time from minutes to seconds - useful for field deployments and proof-of-concept units.
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Vehicle Fleet Telematics Units
The LM825's magnetic base and multi-band cellular coverage make it a frequent choice for vehicle fleet telematics and OBD-II tracker installations where a permanent antenna mount is not feasible. The whip section tolerates moderate vibration, and the magnetic base adheres to vehicle roof panels for temporary fleet deployment. With 3.4 dBi peak gain across 800/900/1800/1900 MHz, the antenna supports 2G/3G/LTE telematics radios including LTE Cat-M1. Operating temperature of -40C to +85C covers both cabin and engine-bay telematics boxes. The omnidirectional vertical polarization matches the typical polarization of cellular base-station antennas in urban and suburban environments.
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Industrial IoT Gateways with Wi-Fi Backhaul
For industrial IoT gateways combining sub-GHz or cellular IoT radios with 2.4/5 GHz Wi-Fi backhaul, the LM825 provides single-antenna coverage of all bands. The 2.4-2.5 GHz and 4.9-5.8 GHz coverage enables 802.11 b/g/n/ax Wi-Fi link alongside the cellular link, eliminating the need for separate antennas in mixed-radio designs. The 3.4 dBi peak gain at 2.4 GHz supports typical indoor/outdoor gateway placements within 50-100 m of a Wi-Fi access point. Industrial gateways using the LM825 typically place it on the top of a metal enclosure, leveraging the magnetic base as both a mechanical mount and a partial ground-plane counterpoise.
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Bench Testing and Wireless Module Characterization
Engineers characterize cellular and Wi-Fi modules on lab benches using the LM825 magnetic whip antenna because it can be repositioned instantly without tools or PCB modifications. The 50-ohm SMA interface matches the antenna port of nearly all cellular and Wi-Fi evaluation kits. The 3.4 dBi peak gain provides repeatable reference radiation, and the multi-band coverage allows testing across cellular and 2.4/5 GHz ISM bands with a single antenna. Compared to a laboratory horn antenna, the LM825 is significantly lower cost and requires no anechoic chamber, though absolute gain measurements require calibrated reference antennas.
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Temporary Cellular Signal Surveys
Field technicians conducting cellular signal surveys and propagation studies use the LM825 magnetic whip antenna as a portable receive antenna for spectrum analyzers and cellular scanners. The magnetic base attaches to vehicle roofs or ferrous equipment cabinets, allowing quick repositioning between measurement points. Multi-band coverage of 800/900/1800/1900 MHz and 2.4/5 GHz enables survey of all common cellular bands plus ISM interference sources. The 3.4 dBi gain is sufficient for comparative signal-strength measurements, though absolute calibration requires a known reference antenna.
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Smart Home and Consumer IoT Prototyping
Smart-home developers prototyping Wi-Fi and Bluetooth IoT products use the LM825 magnetic whip antenna to bring-up wireless firmware on Raspberry Pi, ESP32, or Linux SBC platforms before committing to a permanent antenna design. The 2.4 GHz coverage supports 802.11 b/g/n/ax and Bluetooth/BLE while the magnetic base eliminates the need for a u.FL-to-SMA pigtail on development boards. Gain of 3.4 dBi provides reliable indoor link margins for typical home-network distances. Once the prototype is validated, the developer transitions to an SMD chip antenna or PCB trace antenna for the production design.
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추천 제품 요약
엔지니어링 참조 데이터: LM825 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | W1047 | W1063 | TG.30.8113 | TG.35.8113 |
|---|---|---|---|---|---|
| Package | Magnetic Whip | Magnetic Whip | Magnetic Whip | Magnetic Whip | Magnetic Whip |
| Brand | Pulse Electronics | Pulse Electronics | Pulse Electronics | Taoglas | Taoglas |
| Peak Gain (dBi) | 3.4 dBi | ~3 dBi | ~3 dBi | ~4 dBi | ~5 dBi |
| Frequency Bands | 824-894 / 1850-1990 / 2400-2500 / 4900-5800 MHz | Cellular sub-bands | Broadband cellular + ISM | 617-6000 MHz (sub-6 5G) | 600-6000 MHz |
| Impedance | 50 ohm | 50 ohm | 50 ohm | 50 ohm | 50 ohm |
| 5G NR Support | No (LTE only) | No | No | Yes (sub-6) | Yes (sub-6) |
| Mounting Style | Magnetic base | Magnetic base | Magnetic base | Magnetic base | Magnetic base |
| Connector Type | SMA male (typical) | SMA male (typical) | SMA male (typical) | SMA male | SMA male |
주요 차별점
- Single antenna covers cellular and 2.4/5 GHz Wi-Fi (vs Single-band cellular whips)
- Lower cost than 5G NR magnetic antennas (vs Taoglas TG.30.8113 (sub-6 5G magnetic mount))
- Wide operating temperature range (vs Consumer-grade magnetic whips)
설계 노트
Estimated: When mounting the LM825 magnetic whip antenna, place it on a flat ferrous metal surface at least 30 cm in any direction to provide an adequate ground-plane reference. A smaller ground plane reduces efficiency below 1 GHz by several dB due to insufficient counterpoise. Position the antenna away from other metal structures that could shadow the radiation pattern.
Do not use the LM825 on non-ferrous surfaces such as aluminum, plastic, or composite enclosures. Without a ferromagnetic base, the magnetic mount will not adhere and the antenna will have no counterpoise, leading to severe VSWR degradation. For non-ferrous enclosures, switch to a permanent-mount antenna with a built-in ground plane or an adhesive-mounted patch antenna.
The LM825's 50 ohm nominal impedance should be matched to a 50 ohm coaxial cable and a 50 ohm antenna port on the radio module. Using a higher-loss cable (e.g., RG174 beyond 1-2 m) reduces total radiated power and receive sensitivity. For installations where the radio is more than 3 m from the antenna, use a low-loss coaxial cable such as LMR-200 or LMR-400.
규정 준수 정보
RoHS and REACH compliance confirmed per Pulse Electronics product page. AEC-Q100 not applicable for passive antenna. Halogen-free status not explicitly stated in the verified data.
