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Sector antenna
Sector antenna
Sector antenna
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Typical GSM sector antenna outdoor unit

A sector antenna is a type of directional microwave antenna with a sector-shaped radiation pattern. The word "sector" is used in the geometric sense; some portion of the circumference of a circle measured in degrees of arc. 60°, 90° and 120° designs are typical, often with a few degrees 'extra' to ensure overlap and mounted in multiples when wider or full-circle coverage is required (see photos below). The largest use of these antennas is as antennas for cell phone base-station sites. They are also used for other types of mobile communications, for example in Wi-Fi networks. They are used for limited-range distances of around 4 to 5 km.

Design

[edit]
Horizontal and vertical radiation patterns. The antenna radiates a horizontal fan-shaped beam, sharp in the vertical axis so it doesn't spill over into neighboring sectors.

A typical sector antenna is depicted in the figure on the right. At the bottom, there are RF connectors for coaxial cable (feedline), and adjustment mechanisms. For its outdoor placement, the main reflector screen is produced from aluminum, and all internal parts are housed into a fiberglass radome enclosure to keep its operation stable regardless of weather conditions.

Grounding is very important for an outdoor antenna so all metal parts are DC-grounded.

The antenna's long narrow form gives it a fan-shaped radiation pattern, wide in the horizontal direction and relatively narrow in the vertical direction. According to the radiation patterns depicted, typical antennas used in a three-sector base station have 66° of horizontal beamwidth. This means that the signal strength at the ±33° directions is half (3 dB down) from its peak value at the center. At the ±60° directions, it is suggested to be a border of a sector and antenna gain is negligible there.

Vertical beamwidth is not wider than 15°, meaning 7.5° in each direction. Unlike antennas for commercial broadcasting - AM, FM and television for example - which must achieve line-of-sight over many miles or kilometers, there is usually a downward beam tilt or downtilt so that the base station can more effectively cover its immediate area and not cause RF interference to distant cells.

The coverage area, which is determined by the projection of the radiation pattern on the ground, can be adjusted by changing the downtilt of the pattern. In some models this is done mechanically by manually adjusting the tilt of the antenna with an adjustable mounting bracket. In more recent sector antennas the pattern can be electronically tilted, by adjustable phase shifters in the feed of the individual dipole elements. These are adjusted by a remote control circuit from the ground, eliminating the need for a technician to climb the antenna tower.

Use

[edit]
Sector antennas installed on a short mast
Top of cellular base station tower with sector antennas
Sector antennas are often installed on existing structures.

To increase or widen the coverage area, and thus the number of served clients, several sector antennas are installed on the same supporting structure, e.g. tower or mast.[citation needed]

Such a construction is often called a sectorized antenna, though sometimes for brevity "sector antenna" is used as well. It has several angularly-separated sector antennas as shown on the figures at right.

Once the antenna unit is attached to a supporting structure, it has to be positioned. Positioning means not only setting a correct direction or azimuth, but setting a correct downtilt as well. By restricting emitted energy to a sub-circular arc and narrow vertical coverage the design makes efficient use of relatively low power transmitter equipment. Though absolute range is limited, this configuration allows for good data rates (digital information transfer measured in bits/second, sometimes given as total minus error-correction overhead), and good signal consistency within the coverage area.

Prior to positioning, grounding and lightning protection are required. As seen in the pictures, all supporting constructions have lightning rods.

An antenna at bottom has bigger mechanical downtilt

A well-chosen downtilt setting strategy can lower the overall interference in the network. A too-aggressive downtilting strategy will however lead to an overall loss of coverage due to cells not overlapping. Downtilting can be used to solve specific problems, for example local interference problems or cells that are too large. Electrical tilting slightly reduces beam width.

In a picture on the right, there are two sector antennas with different mechanical downtilts. Note that a more vertical antenna is less visible than a mechanically tilted one - the use of purely electrical tilt with no mechanical tilt is therefore an attractive choice for aesthetic reasons which are very important for operators seeking acceptance of integrated antennas in visible locations.

See also

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Sector antenna

View on Grokipedia
from Grokipedia
A sector antenna is a type of featuring a sector-shaped , designed to provide focused coverage over a specific angular portion of the surrounding area rather than omnidirectionally. These antennas are essential components in communication , particularly for base stations in cellular networks, where they enable efficient signal distribution to multiple users within defined sectors while minimizing interference and multipath effects. Typically constructed as a panel or array of dipoles backed by a reflector—often aluminum with a fiberglass radome for weather protection—sector antennas offer high gain and adjustable features like electrical or mechanical downtilt to optimize vertical coverage. In terms of key characteristics, sector antennas commonly exhibit azimuth beamwidths of 60°, 90°, or 120° for three-sector configurations that collectively provide 360° horizontal coverage when mounted back-to-back on towers, with narrower elevation beams to concentrate energy toward ground-level users. Their dimensions are often compact, such as approximately 1 foot by 4 feet, allowing multiple units (e.g., two to four per sector in configurations totaling 6-12 antennas or more) to be installed at various heights on cell towers for enhanced capacity in dense urban environments. Operating across a wide range of frequencies from 900 MHz to 15 GHz, they support polarizations including vertical, horizontal, dual linear, and circular, with gains reaching up to 20 dBi depending on the beamwidth and design. Sector antennas play a pivotal role in modern , including LTE, , WLAN, and , where they facilitate point-to-multipoint communications, MIMO configurations for increased throughput, and geo-targeted in systems like . In and emerging 6G, they support massive MIMO and for higher capacity. Beyond cellular applications, they are employed in military, security, and / setups to handle high RF traffic density, with features like sidelobe suppression and null-fill enhancing pattern quality for reliable performance in challenging propagation conditions.

Fundamentals

Definition and Characteristics

A sector antenna is a directional designed to produce a sector-shaped , providing focused coverage over a specific angular portion of the surrounding area rather than uniform 360° distribution. The "sector" designation derives from the geometric fan-like of its beam, which typically spans 60°, 90°, or 120° in the horizontal () plane to target a defined wedge of space, while featuring a narrow vertical () beamwidth of 15° or less to concentrate energy horizontally. Key characteristics include significantly higher gain compared to omnidirectional antennas, often ranging from 10 to 20 dBi, which enhances signal strength and directivity for efficient power utilization in targeted directions. This gain enables typical operational ranges of 4 to 5 km in cellular environments, depending on frequency, power, and terrain. The radiation pattern emphasizes high directivity within the defined sector to maximize coverage efficiency, with low sidelobe levels—often suppressed to -25 dB or better—to reduce interference from adjacent areas. Multiple sector antennas can be arranged around a central point, such as a mast, to achieve comprehensive 360° coverage; for instance, three 120° sectors or six 60° sectors collectively serve the full circle without significant overlap or gaps. This modular approach distinguishes sector antennas from full-coverage alternatives, prioritizing precision in beam shaping for applications requiring spatial reuse of frequencies.

Historical Development

The development of sector antennas traces its roots to early directional antenna designs in the 20th century, which provided focused radiation patterns essential for later sectorized systems in telecommunications. These directional principles influenced the sector antenna's evolution by enabling beam shaping to cover specific angular sectors rather than omnidirectional transmission. Sector-specific advancements emerged in the 1970s and 1980s amid the rise of cellular telephony, where the cellular proposed by Bell Laboratories in 1947—using hexagonal cells for frequency reuse—was refined to incorporate for sectorization, replacing omnidirectional setups to boost capacity and reduce interference. By the early 1980s, with the launch of analog systems like Japan's High-Capacity Mobile Telephone system in 1979 and the U.S. AMPS in 1983, three 120° sector antennas per cell became standard, tripling spectrum efficiency in hexagonal layouts as detailed in foundational cellular engineering texts. This adoption was driven by the need to handle growing mobile , confining signals to sectors for better channel reuse and interference control in early 1G networks. In the 1980s, sector antennas were integral to the development of the , standardized in 1990 and deployed from 1991, where they supported base stations in dividing cells into sectors to enhance voice capacity and coverage in 900 MHz and 1800 MHz bands. The 1990s saw further evolution through integration with technologies, such as adaptive arrays and digital , which built on sector designs to dynamically adjust patterns for multipath and higher data rates in emerging digital networks. By the 2000s, advancements like mechanically adjustable electrical tilt (introduced mid-1990s) and remote electrical tilt (RET, standardized early 2000s by ) enabled precise beam adjustment in 3G and 4G LTE base stations, optimizing coverage without physical repositioning and supporting up to 50% capacity gains. Post-2010, sector antennas evolved into multiband configurations to accommodate New Radio (NR), incorporating multiple frequency bands (sub-6 GHz and mmWave) and massive arrays for enhanced throughput and , as seen in deployments starting around 2018 that integrate legacy sectors with capabilities for seamless spectrum efficiency. These designs prioritize dual-polarization and wideband elements to handle diverse applications, marking a shift toward integrated, high-density antenna systems in modern cellular .

Design

Principles of Operation

Sector antennas operate on directional principles, where electromagnetic is focused into a specific sector-shaped to achieve high gain and . This focusing is accomplished using an of elements positioned in front of a shaped reflector, which directs the radiated power into a controlled beam while minimizing dispersion in other directions. The reflector's size and curvature play a critical role in determining the antenna's performance, enabling efficient concentration of for targeted coverage in wireless networks. The of a sector antenna features a defined horizontal beamwidth, typically 60°, 90°, or 120° at the 3 dB down points, with becoming negligible beyond the beam edges to limit spillover. Vertically, the beamwidth is narrower, typically 6°-18° depending on and gain, which helps in concentrating energy toward the from elevated installations. suppression is engineered to be greater than 18 dB for upper sidelobes relative to the main beam, reducing unwanted emissions that could interference in adjacent sectors. Performance criteria, including beamwidth and sidelobe levels, often adhere to industry standards such as BASTA ( Antenna Standards). Beam tilt mechanisms allow optimization of the radiation pattern for specific coverage needs. Mechanical tilt involves physically angling the entire antenna structure using adjustable mounts, which can introduce pattern distortion or "blooming" at greater angles. Electrical tilt, in contrast, employs phase shifters to progressively vary the signal phase across the array elements, enabling precise beam adjustment without mechanical movement and maintaining pattern integrity across the full azimuth. Sectorization leverages multiple sector antennas, typically 3 to 6, arranged in a circular configuration to provide comprehensive 360° coverage around a . This approach spatially separates signals into distinct sectors using directed beams, substantially reducing compared to omnidirectional antennas that radiate uniformly in all directions. By isolating sectors with orthogonal resources, sectorization enhances capacity and signal quality in cellular systems.

Components and Construction

Sector antennas are constructed with robust components designed for long-term outdoor deployment in harsh environmental conditions. The core reflector, typically made from or other corrosion-resistant metal alloys, shapes the antenna's beam by reflecting radiated into a specified sector. This reflector is often a flat or slightly curved screen with integrated ridges to enhance . Enclosing the assembly is a , which provides weatherproofing against , , and UV exposure while minimizing signal attenuation. RF connectors, such as N-type interfaces, are integrated at the base for reliable signal input from transceivers, ensuring low and weather resistance. Internally, sector antennas feature radiator arrays composed of dipoles or patch elements, usually arranged in a linear or planar configuration to generate the desired polarization and coverage. These elements, often fabricated from extruded aluminum profiles for durability, are positioned in front of the reflector to optimize . Phase shifters, commonly implemented as adjustable mechanical or remote electrical tilt (RET) mechanisms, allow for fine-tuning of the vertical beam without physical repositioning. Additionally, DC grounding blocks are incorporated to shunt lightning-induced surges to ground, protecting sensitive from transient overvoltages. Construction emphasizes materials suited to extreme conditions, including corrosion-resistant aluminum alloys for structural elements and UV-stabilized for the , which offers stiffness, paintability, and longevity. Typical dimensions for cellular sector antennas range from 1 to 2 in height, balancing gain requirements with tower loading constraints. Manufacturing involves precision assembly techniques, such as laser-cut components and sealed enclosures, to preserve radiation integrity across operating bands. To support modern networks, sector antennas are engineered for multiband operation, covering frequencies from 700 MHz to 3.5 GHz for and applications, achieved through optimized element spacing and broadband feeds. The reflector's directly influences the resulting patterns, sector-specific beamwidths like 65° or 90° in azimuth.

Types and Variations

Panel sector antennas are flat, compact designs typically used in urban environments to their small and ease of mounting on buildings or poles. These antennas often provide coverage angles such as 90 degrees in the horizontal plane, making them suitable for targeted deployments where space is limited. Tubular or cylindrical sector antennas feature a rounded enclosure that houses the radiating elements, offering larger dimensions for broader coverage in open areas like rural cellular sites. They commonly include integrated mounting hardware for direct attachment to towers, enhancing stability in wind-prone locations. Variations in sector antenna design include multibeam configurations optimized for 5G networks, such as those supporting 64 transmit and 64 receive (64T64R) elements in massive MIMO systems to enable multiple simultaneous beams for higher capacity. Hybrid reflector-array types combine parabolic reflectors with phased array feeds to achieve flexible beam shaping within a sector, balancing size and performance. Additionally, models differ in beamwidth adjustability, with fixed beamwidth versions providing consistent patterns for stable installations, while adjustable ones allow on-site tuning via mechanical or electronic means to adapt to varying terrain. Specialized tri-sector antennas integrate three independent sectors into a single cylindrical unit, promoting space efficiency in dense urban deployments by reducing the number of required mounts. This design emerged in the mid-2000s to address site constraints in growing cellular networks.

Applications

Cellular and Mobile Communications

Sector antennas play a central role in cellular base stations, where they are typically deployed in configurations of 3 to 6 sectors per site to provide azimuthal coverage of 120° or 60° per sector, respectively. This sectorization divides the cell into narrower coverage areas, facilitating frequency reuse across sectors and neighboring cells while minimizing co-channel interference, which enhances overall network capacity and spectral efficiency. In macrocellular deployments, such arrangements allow operators to allocate distinct frequency bands or channels to each sector, reducing interference and supporting higher user densities in urban environments. The integration of sector antennas has evolved alongside cellular standards to meet growing demands for voice, data, and mobility. In 2G () and 3G () networks, sector antennas were essential for providing reliable voice services and basic data connectivity by enabling directional coverage that improved signal quality in voice-dominated scenarios. With the advent of 4G LTE, they became critical for boosting data throughput, leveraging multiple-input multiple-output () techniques within sectors to achieve higher and support . In 5G networks, including 5G-Advanced as of 2025, sector antennas incorporate advanced capabilities, such as massive , to deliver even higher speeds and maintain connectivity at mobilities up to 100 km/h, enabling seamless handovers in vehicular scenarios while addressing the challenges of millimeter-wave propagation. Performance in cellular networks benefits from sector antennas' ability to enhance the (SINR) within defined sectors compared to omnidirectional setups, which directly translates to improved coverage and reduced dropped calls. A key optimization is electrical or mechanical downtilt, typically set between 2° and 10°, which directs the main beam toward ground-level users, minimizing interference to adjacent cells and focusing energy where most subscribers are located. For instance, in urban deployments, sector antennas with a 65° horizontal beamwidth are commonly used to balance coverage area and interference control in dense city environments, supporting efficient cell planning for voice traffic.

Wi-Fi and Broadband Wireless

Sector antennas play a crucial role in outdoor deployments, particularly for access points covering campuses, public hotspots, and urban areas. These antennas typically feature beamwidths of 90° to 120° to provide targeted coverage over areas ranging from hundreds of meters to a few kilometers, while minimizing interference from adjacent sectors. For instance, the cnPilot e501S is an 802.11ac outdoor sector access point with an integrated 90°–120° sector antenna, supporting up to 256 concurrent clients and designed for enterprise environments like campuses and hotspots. Such configurations align with 802.11 standards operating in the 2.4 GHz and 5 GHz bands, and increasingly extend to 6 GHz for 6E and 6 GHz+ for 7 (802.11be) as of 2025 to enhance capacity in dense settings. In broadband wireless applications, sector antennas enable service providers (WISPs) to deliver point-to-multipoint (PtMP) connectivity in rural and underserved regions. Mounted on towers, these antennas facilitate coverage radii of 5–10 km under line-of-sight conditions, serving multiple subscriber modules efficiently. Ubiquiti's airMAX sector antennas, with 90° or 120° beamwidths and gains around 16–17 dBi, are commonly used in such PtMP setups to support high-capacity links for access. This approach allows WISPs to bridge the by providing reliable to remote homes and businesses without extensive wired infrastructure. Integration of sector antennas with multiple-input multiple-output () technology further boosts performance in modern Wi-Fi standards like 802.11ac and 802.11ax. Dual-polarized sector designs, featuring separate horizontal and vertical polarizations, enable 2x2 or 4x4 configurations to increase throughput and , particularly in outdoor environments. For example, Tesswave's dual-polarized sector antennas support across 2.4 GHz and 5 GHz bands, delivering gains of 10–18 dBi to improve rates in . This polarization diversity helps mitigate multipath and enhances overall network . In mesh networks, sector antennas contribute to seamless connectivity in dense environments by directing signals to specific zones, thereby reducing unnecessary handoffs between nodes. By focusing coverage within 60°–90° sectors, these antennas maintain stronger, more stable links for mobile clients, minimizing disruptions in high-traffic areas like campuses or events. Tesswave sector antennas, for instance, are applied in mesh topologies to optimize coverage and lower interference in such scenarios.

Other Applications

Sector antennas are utilized in public safety and emergency response scenarios, particularly in temporary base stations deployed during disasters to restore critical communications. These setups, such as Cell on Wheels (COW) units, incorporate sector antennas to deliver targeted 120° coverage, rapid connectivity for in affected regions, as seen in FEMA's mobile emergency response operations. In broadcasting and television applications, sector antennas function as auxiliary elements in Broadcasting - Terrestrial (DVB-T) gap-filler systems, retransmitting signals to fill coverage voids in uneven like valleys or obstructed urban areas. By employing directional sector designs, these systems achieve necessary isolation between receiving and transmitting antennas—often exceeding 100 dB through careful positioning and control—to prevent feedback loops and ensure reliable signal . Emerging applications leverage sector antennas in Internet of Things (IoT) networks, including Narrowband IoT (NB-IoT) infrastructures for smart cities, where base stations use sectorized configurations to optimize low-power, wide-area coverage for sensors monitoring utilities, traffic, and environmental conditions. Additionally, in radar systems, sector scanning with directional antennas enables electronic or mechanical scanning over defined arcs, such as 90° to 120° sectors in airborne weather radars, to detect precipitation patterns and aviation hazards ahead of aircraft. Military adaptations of sector antennas emphasize narrow beamwidths, like 60° sectors, for secure tactical operations, directing signals to specific zones while reducing detectability and interference in dynamic environments. This approach evolved from 1980s developments in smart antenna technology within the defense sector, where digitally adaptive beamformers were pioneered to counter heavy jamming and monitor signals in contested spaces.

Deployment and Performance

Installation and Configuration

Sector antennas are mounted on towers or masts using robust brackets designed to withstand environmental loads such as and , with direct or pipe mounting options supporting mast diameters from 60 to 120 mm. In cellular networks, these antennas are typically installed at heights of 30 to 100 to achieve optimal coverage and minimize interference from ground clutter. Guyed towers, typically and triangular in cross-section, require secure guying with tensors and turnbuckles, while self-supporting towers provide alternative stability for urban deployments. Azimuth alignment ensures the antenna's beam points in the intended direction, with precise adjustments achieved by loosening mounting bolts and rotating before retightening to specified torques, such as 30 Nm for M12 bolts. For trisector configurations, antennas are spaced at 120-degree intervals around the tower to deliver seamless 360-degree coverage, avoiding beam overlap while maximizing sector isolation. Alignment tools, including inclinometers or signal analyzers, verify the boresight direction within ±10 degrees of obstructions. Configuration involves setting the downtilt to align the beam with terrain contours, using mechanical methods like sliding or scissor mounts for fixed adjustments of 0 to 10 degrees, or electrical methods for finer control. Remote Electrical Tilt (RET) enables dynamic downtilt optimization without physical access, with tilt values set in 0.1-degree increments via standardized protocols, achieving response times under 2 minutes to adapt to varying network demands. Antenna serial numbers and actuator programming must be matched and tested pre-installation to ensure compatibility. Safety protocols include comprehensive grounding to earth-termination systems with resistance below 10 ohms, using conductors of at least 16 mm² cross-section connected to a main earthing . arrestors, such as Type 1 surge protective devices rated for ≥100 kA (10/350 μs ), are installed at entry points to divert strikes, while high-voltage insulated (HVI) conductors maintain a minimum separation distance of 0.75 meters in air from guy wires to prevent . Site surveys assess RF propagation, incorporating data and models to inform downtilt and placement for effective coverage . Post-installation testing verifies through measurements in anechoic or open-area facilities, confirming beam shape and sidelobe levels align with specifications. Voltage Standing Wave Ratio (VSWR) is measured across the operating band, targeting values below 1.5:1 to ensure efficient power transfer and minimal reflections. These assessments, often using vector network analyzers, confirm proper alignment and configuration before commissioning.

Advantages and Disadvantages

Sector antennas provide several key advantages over omnidirectional antennas, primarily to their higher gain and , which typically range from 15-18 dBi compared to 5-12 dBi for omnidirectional models, resulting in 10-15 dB better performance in targeted directions. This focused radiation pattern reduces interference by concentrating energy within a specific sector, improving signal quality and enabling longer effective ranges in the covered area. Additionally, sectorization divides cells into multiple sectors (often three at 120 degrees each), allowing reuse across sectors and increasing overall network capacity by up to a factor of 3 in cellular systems. Despite these benefits, sector antennas have notable disadvantages relative to omnidirectional alternatives, including higher manufacturing and deployment costs due to their more complex construction involving multiple elements and feeds. Their narrower beamwidth (typically 60-120 degrees) limits coverage to specific sectors, necessitating multiple antennas to achieve full 360-degree coverage around a site, which adds to infrastructure requirements. Misalignment between sectors can also lead to inter-sector interference, degrading performance if adjacent beams overlap unintentionally. Performance trade-offs further complicate sector antenna use; for instance, electrical downtilt enhances by avoiding visible mechanical adjustments and provides flexible beam shaping to minimize interference between sites, but it uniformly reduces gain across the without distorting the beam shape. In urban environments, sector antennas remain vulnerable to multipath propagation, where reflections from can distort signals despite , potentially requiring additional techniques. In comparisons, sector antennas outperform omnidirectional ones in efficiency for dense urban or suburban deployments by enabling better interference management and capacity scaling through sectorization. Relative to point-to-point antennas, which often achieve 20-30 dBi gain with narrower beams (10-30 degrees) for long-haul links, sectors offer wider coverage (up to 120 degrees) but at the cost of lower peak gain, making them more suitable for multi-user access rather than dedicated backhaul.

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