dielectric resonator antennas

... (continued) • Active antennas – Essentially passive antennas with an amplifier built-in – Amplifier is connected directly to the piece of metal that forms the antenna itself – Most active antennas have ... to transmit or receive – Lower frequency signals require larger antennas 10 Antenna Sizes and Shapes (continued) • Omnidirectional antennas – Used to transmit and receive signals...

Ngày tải lên: 13/09/2012, 10:52

... Copyright 2005 All Rights Reserved 33 Diverse Antennas http://www.fab-corp.com February 2005 Copyright 2005 All Rights Reserved 34 Diverse Antennas ● Diverse antennas are used to overcome multipath ... Antenna Switch ● Diverse antennas include two antennas that are connected to an RF switch which in turn is connected to the receiver. ✔ The receiver switches between antennas s...

Ngày tải lên: 13/09/2012, 11:16

... Fiber Optic Cable All -Dielectric Outside Plant Cables ADC’s line of outdoor all -dielectric loose tube cables with polyethylene jackets are designed to ... core • Available in singlemode, 50 µm and 62.5 µm multimode versions • Gel-filled buffer tubes • All -dielectric or armored construction • Available in hybrid constructions (singlemode and multimode) • ... +1-952-938-8080 • 1-800-366-3...

Ngày tải lên: 10/12/2013, 02:15

... Fiber Optic Cable All -Dielectric Outside Plant Cables ADC’s line of outdoor all -dielectric loose tube cables with polyethylene jackets are designed to ... core • Available in singlemode, 50 µm and 62.5 µm multimode versions • Gel-filled buffer tubes • All -dielectric or armored construction • Available in hybrid constructions (singlemode and multimode) • ... +1-952-938-8080 • 1-800-366-3...

Ngày tải lên: 21/12/2013, 08:17

... 27.1E L = 2.5 8 3-4.1 Figure 1. Frequency Effects FREQUENCY / PHASE EFFECTS OF ANTENNAS The radiation patterns of the antennas presented in the previous section are for antenna geometries most commonly used. ... sensitivity of the phase shifting networks. Two antennas that warrant special consideration are the phased array and the Rotman bootlace type lens. Both of these antennas find...

Ngày tải lên: 22/12/2013, 10:15

Ngày tải lên: 25/12/2013, 10:34

... Microstrip Antennas ( RMSAs)  Circular Microstrip Antennas ( CMSAs)  Semicircular Microstrip Antennas (SCMSAs)  Equilateral Triangular Microstrip Antennas ( ETMSAs) 14 Rectangular Microstrip Antennas ... dụng của anten 17 Semicircular Microstrip Antennas (SCMSAs) 2 , W 4 a L a π → → Mô hình tương đương về dạng RMSA 18 Equilateral Triangular Microstrip Antennas (ETMSA...

Ngày tải lên: 18/01/2014, 13:20

... IEEE, Special issue on active and adaptive antennas, IEEE Trans. Antennas Propagat., 12, 1964. IEE76 IEEE, Special issue on adaptive antennas, IEEE Trans. Antennas Propagat., 24, 1976. IEE85 IEEE, ... boresight. The gain of directional antennas in the boresight is more than that of omnidirectional antennas, and is measured with respect to the gain of omnidirectional antennas. For ex...

Ngày tải lên: 20/01/2014, 06:20

... polarized antennas. The antenna may be used in Medicare RF systems. The antennas reflection coefficients for differ‐ ent belt thickness, shirt thickness and air spacing between the antennas and ... Therefore, varactors are employed to tune the antennas resonant frequency. Chapter 14 discusses the design of antennas for Cognitive Radio (CR) applications. UWB antennas are required fo...

Ngày tải lên: 19/02/2014, 04:20

... conducting and dielectric losses. The time-averaged version of Poynt- ing’s theorem is discussed in Problem 1.5. 1.9 Simple Models of Dielectrics, Conductors, and Plasmas A simple model for the dielectric ... Single Dielectric Slab, 91 4.5 Reflectionless Slab, 94 4.6 Time-Domain Reflection Response, 102 4.7 Two Dielectric Slabs, 104 4.8 Problems, 106 5 Multilayer Structures 109 5.1 Mult...

Ngày tải lên: 17/03/2014, 13:46