Antennas

A Low Cost Pencil-beam Microstrip Antenna at 76.5 GHz

This article describes the design of a 76.5 GHz microstrip antenna using a simple waveguide distributor. This type of antenna permits any complicated radiation pattern to be obtained. It can be used as part of the transmit/receive module for a compact ...
The design of a millimeter-wave antenna with a pencil-beam pattern is complicated when using a slotted waveguide and results in unacceptable dissipating losses, as high as 8 to 10 dB for a microstrip (RT duroid or Cu/PTFE substrate) distributor. This is why most submillimeter-wave antenna designers avoid traditional VHF...
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Trends in Antennas for Wireless Communications

Examination of a series of innovative approaches in use to meet the demand for antennas that include small size, wide bandwidth, high gain and adaptive pattern control
From mobile telephones to wireless Internet access to networked appliances and peripherals, there is an increasing reliance on wireless communications to provide or enhance functionality for products and services. The wireless communications industry continues to generate new products and applications for consumers and new opportunities for businesses. The enormity...
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A Compact Monopulse Feed for Tracking Antennas

Introduction to the requirements for a compact monopulse feed for use in a Cassegrain antenna configuration
With the steady improvements in tracking radar technologies over the past twenty years, the diameter requirements for antennas has been reduced to match the improvements in transmitter power and receiver sensitivity. This has led to a need for shorter feeds for use in Cassegrain configurations. Antenna feeds have recently...
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QFHA Antennas for Satellite Radio and Mobile Phone Applications

Presentation of a specific quadrifilar helical antenna design for satellite radios, along with a planar design for an integrated BFN90 beam forming network
Quadrifilar helical antennas (QFHA) are one of the best candidates to provide a high gain, shaped beam with excellent circular polarization axial ratio for satellite radio and mobile satellite phone systems. One of the most compelling reasons to use these antennas for digital radio and mobile satellite systems is...
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The Development of Wide Angle Base Station Antennas from Arrays

Use of flat panel array base station antennas to produce wide angle beamwidths up to 120°
Phased array antennas are traditionally used to produce narrow beams from large apertures. In this mode of operation, every radiating element in the array is broadly co-phased. The radiation pattern of the antenna is then the product of both the individual radiating element characteristic pattern and the array factor....
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A 2.4 GHz Polarization-diversity Planar Printed Dipole Antenna for WLAN and Wireless Communication Applications

Presentation of the design simulation, fabrication and measured performance of a 2.4 GHz polarization-diversity planar printed dipole antenna for wireless communication applications
Technical Feature A 2.4 GHz Polarization-diversity Planar Printed Dipole Antenna for WLAN and Wireless Communication Applications This article presents the design simulation, fabrication and measured performance of a 2.4 GHz polarization-diversity printed dipole antenna for wireless communication applications. Two orthogonal printed dipole antennas, each with a microstrip via-hole balun...
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Low Cost Phased Array Antennas for BWA Applications

Introduction to a low cost electronically steered array offering true-time-delay beamforming for ultra-broad bandwidth
Product Feature Low Cost Phased Array Antennas for BWA Applications e-tenna Corp. Laurel, MD Today, most broadband wireless access (BWA) customer premise equipment (CPE) use fixed-beam antennas. These are generally either reflector (dish), or flat-panel array antennas. These antennas have generally been selected based on value - meeting a...
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Characteristics of a Large Bandwidth Rectangular Microstrip-fed Inserted Triangular Patch in a Circular Slot Antenna

Analysis of the characteristics of a rectangular microstrip-fed triangular patch in a circular slot antenna using the finite-difference time domain (FDTD) method
Technical Feature Characteristics of a Large Bandwidth Rectangular Microstrip-fed Inserted Triangular Patch in a Circular Slot Antenna The characteristics of a rectangular microstrip-fed triangular patch in a circular slot antenna have been analyzed using the finite-difference time domain (FDTD) method. The impedance and bandwidth of the proposed antenna greatly...
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Cost-effective Wireless Antenna Measurement Systems

Introduction to two new antenna measurements systems for single- or dual-axis antenna pattern measurements in the wireless frequency ranges
Product Feature Cost-effective Wireless Antenna Measurement Systems MI Technologies Duluth, GA Two new antenna measurement systems have recently been introduced that add to the MI-3600 antenna measurement product line. The MI-3600 family is comprised of 20 antenna measurement systems for single- or dual-axis antenna pattern measurements in the popular...
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Antenna Selection to Minimize Pointing Requirements

Use of antenna optimization to ensure antenna pointing requirements are kept to a minimum
Technical Feature Antenna Selection to Minimize Pointing Requirements Traditionally, when designing a satellite communications system, an allowance is made in the link budget for pointing loss. The earth station's antenna size is then selected to achieve the desired gain margin. In this article, a different approach called antenna optimization...
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