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Directional Antennas
Transmit a focused narrow width radio wave.
See Also: Antennas, Broadband Antennas, Log Periodic Antennas, HF Antennas, Biconical Antennas, Horn Antennas, Isotropic Antennas, Loop Antennas, Antenna Software, Antenna Analyzers, Dipole Antennas
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WLAN Directional Antenna
The COMM-connect WLAN Directional LPDA Antenna offers superior performance in applications requiring directivity. The antenna comes fully equipped with cable & SMA male connector, which makes it very easy to install in any type of installation. Our Antenna is housed in a very rugged radome, orginally designed for Maritime applications.
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VECTOR-GUN HANDHELD DIRECTION FINDING ANTENNA SYSTEM
HFDF
National RF's Type HFDF active directional antenna system consists of a high gain RF amplifier coupled to a tunable Faraday shielded loop antenna. Several loop antenna assemblies are available to provide coverage of frequencies in the HF and low VHF spectrum. Due to the nature of a Faraday shielded loop, the antenna exhibits a sharp null through the diametric center of the loop. This null is used to determine the direction of incoming radio signals or to locate electrical noise being radiated from some source. The internal high gain amplifier is used to compensate for the inherent inefficiency of the actual loop at the operating frequency. Overall, the system dynamic response is about +6 dB as compared to the dynamic response of a dipole. To aid in the direction finding process on strong signals, an internal 30 DB attenuator is provided. As the loop antenna presents a bi-directional response, tri-angulation may be required to eliminate the ambiguous signal direction. The line of site of the incoming signal is determined by listening for a signal null on the receiver or by watching the receiver’s S-meter.
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Sector Antennas
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.
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VHF Radio Direction Finding Antennas
Vector-Finder Series
The Vector-Finder Series of VHF direction finding antennas provide a compact, lightweight, active antenna, suitable for use in the field with handheld transceivers and scanning radios. The mechanical design allows the sense antennas to be folded back to provide a compact unit, easily stowed or transported in any vehicle. The system interfaces with any FM receiver or transceiver via the antenna jack and the earphone jack. Several different models are available to suit your pocketbook or unique field application, all of which operate on the phase shift technique. The VF-142Q models incorporate left-right indicators as well as an audible response from which the user can determine the true direction of the radio signal. The other types utilize the audible response generated by the equipment and heard on the user’s receiver or transceiver. All models operate from a 9-volt battery.
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Attenuators
The National RF line of attenuators are compact, affordable attenuators which are ideal for insertion between a direction finding antenna and a receiver/transceiver, to aid in the DF process. In addition, they may be used in the laboratory for a low-power, in-line attenuation purposes. The affordable price is achieved by utilizing standard 5% tolerance resistors and commercial hardware. For laboratory purposes, an attenuation versus frequency curve (to 500mMHz) is provided.
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Direction Finding Antenna Positioners
D-1509
CAES is a leading designer and manufacturer of custom direction finding antenna positioners for military airborne, ground, and naval applications.
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Lens Antennas
A lens antenna is a directional antenna that uses a shaped piece of microwave-transparent material to bend and focus microwaves by refraction, as an optical lens does for light.[1] Typically it consists of a small feed antenna such as a patch antenna or horn antenna which radiates radio waves, with a piece of dielectric or composite material in front which functions as a converging lens to collimate the radio waves into a beam.[2] Conversely, in a receiving antenna the lens focuses the incoming radio waves onto the feed antenna, which converts them to electric currents which are delivered to a radio receiver. They can also be fed by an array of feed antennas, called a focal plane array (FPA), to create more complicated radiation patterns.
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GPON ONT
ONT-1FE-1GE-RF-W
Hangzhou Softel Optic Co., Ltd.
ONT-1FE-1GE-RF-W is fiber to the home multi service access XPON ONT. It’s based on the mature, stable, high cost performance EPON/GPON technology and has gigabit Ethernet switching, WDM and HFC technology. ONT-1FE-1GE-RF-W has a higher bandwidth, higher reliability, easy management and good quality of service (QoS) guarantee. It supports GPON and EPON two modes adaptive, can quickly and effectively distinguish between GPON and EPON systems, so normal operation under the current system. It adopts single fiber WDM technology with downlink wavelength 1550nm and 1490nm, uplink wavelength 1310nm . It only needs one-core fiber to transmit data and CATV service. ONT-1FE-1GE-RF-W can integration wireless function with meet 802.11 n/b/g technical standards, It has external high gain directional antenna, the wireless transmission rate up to 300Mbps. It has the characteristics of strong penetrating power and wide coverage. It can provide users with more efficient data transmission security.
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Measurement
Site VSWR
The Site VSWR measurement is done according to CISPR 16-1-4 in the frequency range from 1 GHz to 18 GHz using broadband omni directional antennas in horizontal and vertical polarisation. The volumetric test method is applied (test volume needs to be specified), test distance 3 m - any other distance upon request. The ground plane has to be covered with absorbing material.
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Law Enforcement/Public Safety
Vehicular and Handheld antennas are available for communication, surveillance, signal DF, network repeaters and RF Jamming applications. A single omni or high gain directional ARA antenna may cover all cellular and/or Tetra communication bands and are compatible with all network technologies (GSM, CDMA, etc.). These wideband antennas replace the need for several single band antennas and are ideal for vehicular installations as well as handheld radio mounted applications. Permanent installations, quick deploy magnetic mounts or convenient pistol grips for radio location are available.
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VHF/UHF Handheld Signal Location Antennas
Type NVF-2
The Type NVF-2 series of handheld directional antennas are used to locate interfering signals or noise in either the 420 – 470 MHz (Type NVF-2A) or the 900 MHz ISM band or cellular telephone bands (Type NVF-2B). Both models incorporate a solid reflector positioned behind a resonated half wave driven element, both elements being mounted on a fiberglass rod with an integral pistol grip. The configuration of the reflector and driven element are such that a deep null in the signal being received will occur when the antenna is pointed in the direction of the signal being radiated. A T-pad resistive attenuator is also incorporated in the antenna mounting enclosure to aid in the direction finding process on very strong signals or when excessive reflections present multiple returns.
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DVB-T Omnidirectional Antenna
The COMM-connect DVB-T Omnidirectional Antenna offers superior performance in applications requiring bandwidth in all directions. The antenna comes fully equipped with stainless steel mast brackets & 7/16 female connector, which makes it very easy to install in any type of installation. Our Antenna is housed in a very rugged radome, able to withstand very harsh weather conditions.
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Logarithmic Periodic Broadband Antennas
Directional, active broadband antennas that are the ideal solution for interference tracking, site surveying, and most general RF and EMC analysis applications, due to their unique dipole elements positioned along the antenna axis in a triangular shape.
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Portable Monitoring Receiver
PR200
The R&S®PR200 portable monitoring receiver is engineered to effectively support spectrum monitoring, interference hunting, spectrum clearance and site testing. It reliably detects, analyzes and locates signals from 8 kHz to 8 GHz and can be extended up to 20 GHz with the R&S®HE400DC handheld directional antenna and up to 33 GHz with the R&S®HE800-DC30 handheld directional antenna both with an integrated downconverter. Optimized for field operations, the R&S®PR200 provides a perfect balance between RF performance, speed and operability, while offering a range of measurement functions suitable for complex 5G signals.
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Direction Finding
ARA has RF receive solutions for mobile, man portable and fixed site applications for electronic warfare and ISR missions. Our systems include receive only omni RF systems, RF intercept solutions, broadband omni antennas, directional antennas for tactical deployments, and multioctave band horn antennas.
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Antenna Kit
EM-6000 | 10 KHz – 18 GHz
Electro-Metrics antenna kit consists of OmniDirectional and Directional antennas covering the frequency range of 10 kHz to 18 GHz. Accessories are included for use with the antennas. All antennas and accessories are placed in two carrying cases, which are provided.
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Wideband Antennas
A vast portfolio of wideband and directional antennas featuring TECOM technology, including log-periodic and horn antennas, ranging from 20 MHz to 40 GHz. For use as standalone antennas or reflector feeds in parabolic antenna systems, they are deployed in broadband surveillance, tracking, and jamming systems. Our vast array of omnidirectional antennas include: conical spirals for broadband surveillance; slant linear bicones for shipboard DF applications; UHF/ VHF stackables for air-to-ground communications; and airborne instrumentation antennas.
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Noise Location Package
Type HFDF
National RF’s Type HFDF high frequency location system is a proven noise hunting and location directional antenna system that allows you, in many cases, to walk right up to the source of High Frequency (HF) noise! Used by several power companies around the United States, professional noise hunters, and other communications specialists, the HFDF has located noise sources that emanated from pole power transformers, arcing electric fences, CATV in-line amplifiers, plasma TV screens, and even Marijuana grower’s heating lamps! The system incorporates several plug-in, tunable magnetic loop sensors of a proprietary National RF design, that cover the frequency range between 1.8 MHz and 55 MHz. The unit is packaged in a hand-held, lightweight metallic enclosure, with a pistol grip and a magnetic compass mounted on top. The compass is used to get magnetic bearings to the noise source, which may be plotted on a map to triangulate, and ultimately pin-point, the location of the noise source. In certain cases, our customers tell us that they have been able to walk right up to the interfering noise source and correct the situation on the spot!
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Fixed Directional HF Antennas
Kratos Defense & Security Solutions, Inc.
These antennas are intended for fixed station applications and are based on the single mast, transportable 747CD Log-Periodic Antenna Series. The variable take-off angle array configuration results in a high-performance antenna well suited to applications where communications over varying distance is required.
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ELT STALKER Vector-finder
VF-121
The Vector-Finder Types VF-121 and VF 121A are unique in the Vector-finder series of direction finding antennas. They incorporate a proven design, electro statically shielded loop sensing element with modern solid state low noise analog and digital technology to allow detection and location of aircraft band signals. Both the VF-121 and the VF 121A incorporate a unique digital modulator which allows the user to more easily home-in on unmodulated carriers. Such cases occur at airports when transmitter may be accidentally keyed on during aircraft overnight layovers. The VF-121 is specifically designed to be used on airport premises where signal strengths are high. To compensate for very strong signals, an integral attenuator is also incorporated to allow the user to operate the unit close-in to aircraft. The VF-121A differs in that a high gain, low-noise preamplifier is utilized with the sensing element in order to hunt signals that may be weak or at a distance. The unit is ideally suited for the location of ELT transmitters in the field. Both units are tunable over the 118 MHz to 130 MHz aircraft frequencies and interface directly to the user’s aircraft band receiver or transceiver via the antenna jack. With the antenna system connected to the receiver, the user will hear the desired signal. If the signal is unmodulated, the digital modulator will generate a tone on the carrier. When the handheld unit is rotated about, an audible null on the received signal or the generated tone will be heard. This null aligns with the axis of the equipment case and represents the direction of the received signal. This direction may be read from the black dial compass mounted on the top of the enclosure. As the response is bi-directional, triangulation may be used to determine the true bearing when the true direction is not known.
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Rotatable Directional HF Antennas
Kratos Defense & Security Solutions, Inc.
Kratos’ horizontally polarized rotatable log-periodic antennas are constructed with wire radiators supported by a strong and unusually lightweight support structure.
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Antenna, Ultra-Wideband, Directional
EM-6945 | 500 MHz – 25 GHz
The EM-6945 Vector Log Periodic antenna covers the broadest frequency range available in such a small, rugged, deployable package. Offering the uncompromising performance you’ve come to expect from Electro-Metrics, a state-of-the-art design provides the antenna characteristics you need, unmatched by others in the community.
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Directional Gyroscope
A flight instrument used in an aircraft to inform the pilot of the aircraft's heading.
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Directional Source
BAS003
The BAS003 Source is designed to generate homogeneous sound fields using random noise in compliance with the following standards: Building acoustics (insertion loss, acoustic absorption area, etc: ISO 140-3, ASTM E90, ISO 140-5, ASTM E966). The BAS003 is typically used to generate a noise in a free-field for the evaluation of the transmission loss index of a façade. The available high-efficiency power amplifier, BAS002, is light and can be remotely controlled for easy use in the field.
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8 Direction Receiving Loops Antenna System
AS-SAL-12/20/30 - Mark II
The Array Solutions Shared Apex Loop™ Array (AS-SAL-12 Mark II, AS-SAL-20 Mark II, and AS-SAL-30 – Mark II) is an improved version of the new type of receiving antenna that delivers exceptional directivity in a compact package and is useable over a wide range of frequencies without need for adjustment. This array opens the door to a new class of compact, high performance, wideband receiving antennasdeveloped for both amateur and professional users.
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Directional Coupler
RF directionalcouplers coupler both coupler and style packages coupler various frequencies and power levels.
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Antennas
Introducing the new RFSPACE Ultra-Wideband (UWB) and log periodic antennas. These antennas cover different frequency bands from 200 - 12000 MHz. Each antenna is hand tuned and tested to cover the specified frequency band continuously. All antennas except the UWB-4 and TSA900 come with a birth certificate showing the return loss plot of the antenna. The lower cost antennas are not plotted to keep price low.
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Antennas
Elbit Systems of America’s antenna product line offers ruggedized, field-proven, military communication solutions for air, sea and ground operations. These advanced antennas deliver high performing, continuously connected voice, video, and data communications. Our technologies support high up/down-link rates and make our antennas ideal for fixed and maneuver units. Each system is designed to be fully integrated with most broadband satellite communication systems.
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Antennas
Is a specialized transducer that converts electric current into electromagnetic (EM) waves or vice versa.
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Waveguide Directional Couplers
WR-42 to WR-10 waveguide sizes. Split block waveguide versions available. Available in 7 bands including K, Ka, Q, U, V, E, W from 18 GHz to 110 GHz. 30 dB typical directivity. E Bend and H Bend configurations available. 10 dB and 20 dB coupling values are offered.
