To have optimal transmission performances of the proposed dual-band BPF, simulations using EM software Ansoft Designer has been taken. By simultaneously tuning S 1 and S 2 , which are the two factors affecting the couplings between SIRs, the maximum return loss in both two passbands are obtained when S 1 ϭ 0.2 mm and S 2 ϭ 2.1 mm. FABRICATED DUAL-BAND BPF AND MEASURED RESULTSFabricated BPF is shown in Figure 4. The microstrip substrate is r ϭ 2.78, h ϭ 0.8 mm, and the specification of the circuit is as follows: Z 1 ϭ 67 ⍀, Z 2 ϭ 42 ⍀, L 1 ϭ 5 mm, L 2 ϭ 6.4 mm, L 3 ϭ 8.1 mm, L 4 ϭ 5.9 mm, L 5 ϭ 3.9 mm, L t ϭ 6.1 mm, W 0 ϭ 2.1 mm, W 1 ϭ 1.3 mm, W 2 ϭ 2.7 mm, W 3 ϭ 0.9 mm, S 1 ϭ 0.2 mm, S 2 ϭ 2.1 mm. Additionally, in order to obtain impedance matches between 50 ⍀ I/O ports and the BPF, we choose simple tapered lines instead of quarter wavelength impedance transformers as used in Ref. [7], and we find that tapered lines also do well in impedance matching and the key point is that they can save more space to make a compact BPF circuitry.Measured results of the fabricated dual-band BPF are obtained by using network analyzer Agilent8722ES, and are plotted in Figure 5 along with EM simulated results. According to measured results, at 2.4 GHz, which is the central frequency of the first band, insertion loss and Ϫ3 dB fractional bandwidth (FBW) are 0.3 dB and 30%, respectively; at 5.2 GHz, which is the central frequency of the second band, insertion loss and FBW are 0.7 dB and 17%, respectively. In addition, there is about Ϫ40 dB transmission zero at 3.5 GHz, which is introduced by the tapped input/output structures, and it makes good isolation in-between the two passbands. CONCLUSIONUsing two half-wavelength SIRs, this article presents a dual-band BPF with good transmission performances for WLAN system. The two passbands with central frequencies located at 2.4 and 5.2 GHz, respectively are obtained by adjusting impedance ratio and length ratio of the SIRs. This BPF has compact size and simple geometry, low insertion loss and wide in-band bandwidth. Measured results agree well with simulated ones. ACKNOWLEDGMENTThis work was supported by Shanghai leading Academic Discipline Project T0/02. REFERENCES 1. S. Wu and B. Razavi, A 900-MHz/1.8-GHz CMOS receiver for dualband applications, IEEE Solid-State Circuits, 33 (1998) The detection, identification, and tracking of satellite targets are more and more significant. The spacecrafts, such as satellite have specifically movement law, which is described by orbit parameters and attitude parameters. All kinds of satellites have their specific missions. The completion of missions is guaranteed by precise satellite attitude control. For exactly monitoring, tracking, and identifying satellite targets, we must know the variety of satellite attitude. The change of satellite attitudes can cause the change of radar echo. Thereby, it is very important to find out the electromagnetic scattering characteristic of satellite targets in different space attitude conditions. These can give the use...
The Springer Series in Advanced Microelectronics provides systematic information on all the topics relevant for the design, processing, and manufacturing of microelectronic devices. The books, each prepared by leading researchers or engineers in their fields, cover the basic and advanced aspects of topics such as wafer processing, materials, device design, device technologies, circuit design, VLSI implementation, and subsystem technology. The series forms a bridge between physics and engineering and the volumes will appeal to practicing engineers as well as research scientists. Library of Congress Cataloging-in-PublicationData Makimoto, M. (Mitsuo), 1944-Microwave resonators and filters for wireless communication: theory, design, and application / M. Makimoto, S. Yamashita. p. cm. --(Springer series in advanced microelectronics; 4) Includes bibliographical references and index. ISBN 978-3-642-08700-4 ISBN 978-3-662-04325-7 (eBook)
and x6 ϭ x9 ϭ 0.25 mm. The feed line is designed as a T-type with a gap of 0.15 mm and a width 0.6 mm. The simulation and measurement results of S-parameters are shown in Figure 9, in which the resonant frequencies at located at 2.38 GHz, 3.92 GHz, and 5.95 GHz with relative bandwidths of 6%, 7.5%, and 5.3%, respectively. The corresponding insertion losses are lower in this structure, which are Ϫ2 dB, Ϫ2.47 dB, and Ϫ2.67 dB.The results exhibit that the external Q-factors can be adjusted by changing the shape and the location of the feed line. In the same design, the external Q-factor at the third resonant frequency is the largest because of the weakest coupling.ABSTRACT: A simple means using rectangular patch antennas to feed a 2D planar Luneburg lens is presented. The lens together with the patch launching system is modelled using commercial 3D electromagnetic software. The Ϫ23 dB return loss, better than Ϫ20 dB port to port isolation of the patches, as well as 15 dB antenna gain and 5.3°Ϫ3 dB H-plane (lens plane) beamwidth indicate excellent lens performance potential at 23.3 GHz.
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