Download Non-standard Antennas by François Le Chevalier, Dominique Lesselier, Robert Staraj PDF
By François Le Chevalier, Dominique Lesselier, Robert Staraj
This booklet goals at describing the wide range of latest applied sciences and ideas of non-standard antenna structures – reconfigurable, built-in, terahertz, deformable, ultra-wideband, utilizing metamaterials, or MEMS, and so forth, and the way they open the best way to quite a lot of functions, from own protection and communications to multifunction radars and towed sonars, or satellite tv for pc navigation platforms, with space-time range on transmit and obtain. A reference publication for designers during this energetic clinical group linking antenna specialists and sign processing engineers.Content:
Chapter 1 Joint range and Beamforming for Downlink Communications (pages 1–23):
Chapter 2 Acoustic Antennas for Biomedical and commercial Ultrasonic Imaging (pages 25–68):
Chapter three Space?time Exploration for Airborne Radars (pages 69–91):
Chapter four Multifunction Antenna approach ideas (pages 93–100):
Chapter five From a Molecule to an Electro?optic Antenna (pages 101–118):
Chapter 6 Terahertz Broadband Micro?antennas for non-stop Wave Imaging (pages 119–145):
Chapter 7 twin Frequency Millimeter Feed (pages 147–156):
Chapter eight Reconfigurable published Antennas (pages 157–182):
Chapter nine Wideband Antennas and synthetic Magnetic Conductors (pages 183–200):
Chapter 10 excessive Impedance floor with regards to a Radiating Dipole (pages 201–212):
Chapter eleven complicated Processing for Doa Estimation (pages 213–239):
Chapter 12 Multifunction Airborne Antennas (pages 241–254):
Chapter thirteen energetic Sonar (pages 255–270):
Chapter 14 Airborne excessive Precision position of Radiating assets (pages 271–297):
Chapter 15 Ground?based Deformable Antennas (pages 299–326):
Chapter sixteen computerized Take?off and touchdown procedure (pages 327–341):
Chapter 17 Anti?jamming for satellite tv for pc Navigation (pages 343–383):
Chapter 18 Ultra?wideband Antenna platforms (pages 385–407):
Chapter 19 Co?design of the Antenna with LNA for Ultra?wideband purposes (pages 409–424):
Chapter 20 Vector round Harmonic Modeling of 3D?antenna Radiation functionality for an UWB?RT Simulator (pages 425–452):
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Additional resources for Non-standard Antennas
The measurements can be performed using an impedance (or network) analyzer and the sample under test is usually in free resonator conditions to be independent of the mechanical load. Exploitation of the curves can be achieved with simple approximate formulas like in the IEEE standard on piezoelectricity [IEEE 87], or if high precision is required for some materials such as composites, curve fitting procedures using models are developed [TRA 97, TRA 00; KWO 97]. 15. The anti-resonant frequency (fa) corresponds to the maximum resistance component.
Performance of high frequency linear arrays from the literature Material: Active layer composition with the corresponding connectivity; cut: method used for the cut between elements; Ele. Num: number of elements; Mat. : number of the matching layers; Foc: method of focusing in the elevation plane; Pitch: width of an element+cut; t: width cut between elements; fc: transducer center frequency; BW-6dB: relative bandwidth at -6dB; -IL: Insertion loss; C: cross-coupling between elements; Lres: lateral resolution; Ares: axial resolution.
Consequently, low-loss polymers like hard setting epoxy resins are preferred here [NGU 96]. A single type of particle is then added to adjust the acoustic impedance [INO 87]. 4. Radiation of single-element transducers The simplest transducer used for imaging applications is a single element transducer, the scanning being achieved by a motor. 6. A lens is often used to focus the acoustic waves. The radiation pattern of singleelement transducers is then defined by the size of the active element and the lens curvature.