Broadband Planar Antennas: Design and Applications
Broadband planar antennas are the newest generation of antennas boasting the attractive features required, such as broad operating bandwidth, low profile, light weight, low cost and ease of integration into arrays or Radio Frequency RF circuits, to make them ideal components of modern communications systems. Research into small and broadband antennas has been spurred by the rapid development of portable wireless communication devices such as cell phones, laptops and personal digital assistants.
Clearly describes the fundamentals of planar antennas and categorises them according to their radiation characteristics Introduces the advanced progress in broadband planar antennas for modern wireless communications Includes a wealth of case studies, design guidelines, figures and tables This text is essential reading for antenna, RF and microwave engineers and manufacturers within the telecommunications industry.
Table of contents Foreword. Rectangular Microstrip Patch Antennas. Visit eBay's page on international selling. This amount is subject to change until you make payment. For additional information, see the Global Shipping Programme terms and conditions - opens in a new window or tab This amount includes applicable customs duties, taxes, brokerage and other fees. For additional information, see the Global Shipping Programme terms and conditions - opens in a new window or tab. Delivery times may vary, especially during peak periods and will depend on when your payment clears - opens in a new window or tab.
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- Der Streit der Königinnen im Nibelungenlied (German Edition);
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Seller assumes all responsibility for this listing. A book that has been read, but is in good condition. Minimal damage to the book cover eg. If this is a hard cover, the dust jacket may be missing. Binding has minimal wear. The majority of pages are undamaged with some creasing or tearing, and pencil underlining of text, but this is minimal. No highlighting of text, no writing in the margins, and no missing pages. See all condition definitions - opens in a new window or tab Read more about the condition. Phatpocket Book Shoppe phatpocket Particularly, the final modification on the radiating element, which included two chamfers, improves the antenna impedance matching over frequencies from 15 to 18 GHz, which is illustrated in the voltage standing wave ratio VSWR results in Fig.
The proposed antenna exhibits multiple resonances, wherein the impedance reactive part assumes a zero value throughout its entire operating range, i. These characteristics result in a VSWR of less than 2. The conventional patch antenna approximately acts as a resonant cavity, i. In a cavity, only certain modes are allowed to exist at different resonant frequencies. If the antenna is excited at a resonant frequency, a strong field is formed inside the cavity with a strong current on the patch bottom surface.
This effect produces significant radiation and consequently increases the radiation efficiency, which corresponds to the ratio of the power radiated into space to the total input power. In our case, the first antenna resonance is centered at 2. Therefore, the conventional patch antenna is essentially a broadside radiator, which has a relatively large beam width and low gain characteristics.
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- Broadband Planar Antennas Design Applications.
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Its electrical field-plane pattern is typically broader than the magnetic field-plane pattern. The proposed antenna radiation pattern is a result of the interplay between the longitudinal and transversal modes with the truncated ground plane, which causes edge diffraction. It tends to degrade the pattern by introducing rippling in the forward direction and back-radiation for high frequencies because their corresponding wavelengths are much smaller than the ground plane dimensions.
Therefore, the electromagnetic waves for this frequency range are reflected Fig. However, over its lowest frequency range, i.
Broadband Planar Antennas: Design and Applications book download
The guided wavelength is considerably higher than the ground plane; thus, the radiation generated in the slits does not interfere with the ground plane. As a result, an omnidirectional radiation pattern is formed. Meanwhile, diagram curve from 2-GHz frequency carrier shows omnidirectional radiation pattern in azimuth and maximum gain of 2. However, 14 and GHz frequency operations demonstrate radiation pattern disturbed because of increasing of propagation modes, in which their maximum gain are, respectively, 6.
An antenna prototype was constructed using a substrate of Arlon DiClad A. This model is capable of operating from 70 kHz to 70 GHz. Initially, the antenna reflection coefficient S 11 was was performed using a K connector for printed circuit boards, which operates up to 40 GHz. Thus, a good agreement between the simulations and experiments was obtained, even for higher frequencies. The small discrepancy obtained for this case is probably due to two reasons: The experimental results indicate a bandwidth from 1.
The next step was the radiation pattern characterization, in the semi-anechoic chamber from Inatel, by using the following pieces of equipment: Due to our laboratory facilities, we measured the radiation pattern only at 3. The antenna gain assumes lower values over its lowest bandwidth because it behaves as an omnidirectional radiator for these frequencies. As soon as the frequency is increased, the concentration of the radiation lobes is also increased, which means that its gain assumes higher values Fig.
The maximum absolute gain varies from 1.
Broadband Planar Antennas Design Applications – rhotaugwis
An excellent agreement between the HFSS simulations and experimental results is observed. This paper presented the development of a simple, compact and ultra-wideband printed antenna. Numerical and experimental results demonstrated the potential of the proposed antenna based on the reflection coefficient, radiation pattern and gain.
To the best of our knowledge, this is widest bandwidth for a printed antenna that has been published in the literature. The proposed structure can be effectively applied to cognitive radio, UWB systems, broadband communication systems, satellite tracking systems, reflector feeding and measurement devices.
Topics in Signal Process. Analysis and Design, 3rd ed.