Uhf Antenna Explained

The DBJ-2: A Portable VHF-UHF Roll-Up J-pole Antenna For ...
Antenna and what you get is a VHF/UHF base station antenna with λ/2 vertical performance A Portable VHF-UHF Roll-Up J-pole Antenna for Public Service Edison Fong, explained by a 19 inch 2 meter vertical over ... View This Document

Understanding SWR By Example
Understanding SWR by Example Take the mystery and mystique out of standing wave ratio. Darrin Walraven, K5DVW Table 1 SWR vs Reflected Voltage Suppose you have just measured a new antenna with an impedance bridge and you know that the input impedance is 35 Ω in series with 12 Ω reactive. ... Fetch Full Source

Ground-plane Antennas For 144, 222 And 440 MHz
VHF and UHF Antenna Systems 18-21 Fig23—These drawings illustrate the dimensions for the 144-MHz ground-plane antenna. Ground-plane Antennas for 144, 222 and 440MHz ... Retrieve Doc

Design Of Miniaturized Quasi-Yagi Antenna For Portable RFID ...
Design of Miniaturized Quasi-Yagi Antenna for Portable RFID Reader Applications with size and gain requirements is presented for portable ultra high frequency (UHF) radio frequency identification (RFID) reader applications. antenna is explained, ... Fetch Here

The Art Of UHF RFID Antenna Design: Impedance-Matching And ...
The Art of UHF RFID Antenna Design: Impedance-Matching and Size-Reduction Techniques pared. For clarity, the antenna maximum size is fixed at half a as explained in detail in the old book [14], and ... Retrieve Here

Benefits Of Circular Polarization For Mobile Services
Benefits of Circular Polarization for Mobile Services adding a separate vertically polarized UHF antenna This is explained by understanding that circular polarization primarily helps mitigate the effects of small ... Fetch This Document

ISSUE: RF Connector Types Explained - Digital Yacht - Home
ISSUE: RF Connector Types Explained Many Digital Yacht products operate using Radio Frequencies The following connectors are used to connect a VHF antenna to a VHF radio. Sometimes referred to as UHF connectors, the PL259 Coax Cable Explained ... Document Retrieval

Marine VHF Antennas (aerials) And Their Installation
Marine VHF Antennas (aerials) and their installation By John Schofield It is a simple fact that the potential performance of a marine VHF radio is limited by the quality of the antenna and its installation. A badly designed antenna fitted with undersized cable and ... View Doc

RFID Systems Antennas - Siemens
The various antenna and cable parameters are explained, and information is provided on the criteria you must particularly observe. Always observe the following general safety instructions before selecting a UHF antenna from a different vendor: ... Return Document

ABCs Of RFID: Understanding And Using Radio Frequency ...
And using radio frequency identification Introduction Radio frequency identification (RFID) attached to an antenna that receives RF signals from a Ultra-high Frequency (UHF) 1 to 30 feet Compliance tagging and other case ... View Document

Understanding DB - FCC - Federal Communications Commission
The reason why the gain of many antennas, especially VHF/UHF antennas, is measured in dBd is because antenna manufacturers calibrate their equipment using a simple dipole antenna as the antenna, the radiation pattern is very flat and narrow (like a pancake). ... Visit Document

Dummies Guide To Aircraft Antennas - Cumulus Soaring
Dummies guide to aircraft antennas Probably the single biggest issue that we encounter with the installation of our XCOM radios by customers in the field is poor antenna performance. Most customers are simply unaware that a ... Content Retrieval

Check Your Antennas - VSWR - YouTube
Video about voltage standing wave ratio (VSWR) and how to test transmitting antenna systems. ... View Video

BROADBAND CIRCULARLY POLARIZED ANTENNAS FOR UHF SATCOM - URSI
Broadband circularly polarized antennas for UHF SATCOM Ibrahim Tekin1, Oksana Manzhura2, VHF and UHF bands require antenna specifications such as high forward gain, measured will be explained in details, ... Retrieve Full Source

A Dual-Band HF / UHF Antenna For RFID Tags
Explained how the two antennas are combined into one dual-band antenna. A. HF Antenna In the 13.56MHz band, makes the UHF antenna compatible with the HF antenna. The modified antenna with the cutout and the gaps is shown in the middle drawing of Fig. 1. ... Fetch Document

The DBJ-2: A Portable VHF-UHF Roll-up J-pole Antenna
The DBJ-2: A Portable VHF-UHF Roll-up J-pole Antenna By: Edison Fong WB6IQN email: edison_fong@hotmail.com Abstract This can be best explained by a 19 inch 2 meter vertical over an ideal ground plane. At 2 meters, it is a ¼ wave ... Retrieve Full Source

Radio-frequency Identification - Wikipedia
Radio-frequency identification (RFID) The design of chip+antenna controls the range from which it can be read. Short range compact chips are twist tied to the shoe or velcro strapped the ankle. Ultra-high-frequency (UHF: 865–928 MHz) ... Read Article

Magnetic Materials For RFID Antenna Isolators
Magnetic Materials for RFID Antenna Isolators Gregory D. Durgin Abstract—In this paper, we review candidate an-tenna technologies for isolating RFID tag antennas (HF, UHF, and microwave) from the objects on which they are can best be explained using magnetic flux circuits. In a flux ... Retrieve Content

ANTENNAS - Wxlook.com
EVERYTHING EXPLAINED for the Professional Pilot 99 Even More About ANTENNAS MARKER BEACON Antenna : 1. VHF frequency 75 MHz (low-power, about three watts). ... Read Full Source