This paper presents the compact metamaterial inspired triple-band filter using two inverted S-shape resonators and two C-shape stubs with via. The proposed filter is printed on FR-4 epoxy glass substrate with 1.6 mm thickness. The 3-dB measured fractional bandwidths are 40% (1.6-2.4 GHz), 16.5% (3.9-4.6 GHz) and 14.3% (5.2-6.0 GHz) at center frequencies 2.0 GHz, 4.25 GHz and 5.6 GHz, respectively. This filter offers electrical circuit size of 0.22λ g × 0.16λ g where given λ g is the guided wavelength at center frequency of the first passband 2.0 GHz. The performance parameter of the designed filter have been characterized by fractional bandwidth, insertion loss, dielectric constant, return loss, circuit size and group delay. Both simulated and measured results are shown to validate the proposed filter. Finally, the MTM properties of the proposed filter have been verified by extracting its dispersion diagram. It is suitable for GSM 1800, LTE 2300 and WiMAX (5.2-5.8 GHz) application.
This paper gives a basic review and a summary of old and recent advancements on Leaky Wave Antenna theory and design. Leaky waves have been among the most active areas of research in microwave engineering over the second half of the 20 th century. A leaky wave is treated mathematically as a complex plane wave and the resulting radiation pattern is derived in terms of the complex propagation constant. In particular, the compatibility with the printed circuit board technology, their low profile, easiness of fabrication and integration with the other planar components are the strongest features of Leaky Wave Antennas. A LWA uses a guiding structure that supports wave propagation along the length of the structure, with the wave radiating or "leaking" continuously along the structure. Such antennas is classified into two categories, namely one-dimensional and twodimensional variants. They radiate primarily at the end fire direction and broadside direction to get the maximum scan angle of the radiation beam and these antennas may be uniform, quasi-uniform, periodic. These antennas have many applications at the millimetre wavelengths, frequency scanning. In this paper, a summary of some recent advances for these types of structures is given. Recent advances include structures that can scan end fire, structures that can scan broad side, and structures that are conformal to surfaces.
In this paper, the scanning rate (SR) is enhanced for substrate integrated waveguide (SIW) based periodic leaky wave antenna (LWA) with continuous beam scanning. Delay line is inserted in the SIW based periodic LWA to modify the group delay profile which in turn increase the SR of the SIW based periodic LWA. Addition of the delay line enhances the SR of the SIW LWA to approximately three times from 15.6° to 47° per GHz. The prototype of the proposed LWA is fabricated and experimentally measured. The simulated and measured results show that the proposed LWA scans the angular range from −30° to +27° within a frequency span of only 1.2 GHz from 14.8 to 16 GHz (relative bandwidth of 7.7 %).
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