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In this paper, a novel technique for reducing the dimensions of patch antennas and their arrays is presented. The procedure uses complementary split ring resonators (CSRRs) for increasing the slow-wave effect on the radiator, and therefore augmenting its electrical length, which implicates the modified antenna gets a lower physical dimension than a conventional one for a given frequency. Led by the use of CSRRs, the patches may be closer to each other, without affecting the side lobes magnitude either the directivity of the array compared to a conventional one. As an example, a 4 × 1 patch array was designed and its total area was 40% smaller compared to a conventional one, considering the same design conditions with and without CSRRs. The gain, directivity, and coupling of the prototype were not affected. [ABSTRACT FROM PUBLISHER]

In this article, a novel multiband–multislot planar antenna is presented. The proposed antenna is based on the small loop- and slot radiators, showing multiple resonances. The antenna is built on a substrate with a permittivity of 2.2 and a thickness of 1.27 mm. The antenna resonates at 0.84, 1.55, 2.5 and 4.8 GHz behaving with quasi-omnidirectional radiation patterns, which can be employed in the state of the art automotive technology, laptops and tablets among other terminal devices. The resonances can be shifted to lower or higher frequencies depending on the slots’ length and width, as well as the magnetic coupling among them. Moreover, additional resonances can be introduced by etching new slots on the substrate metallization. [ABSTRACT FROM AUTHOR]

In this work, an ultra-wideband planar inverted-F antenna is presented, fed by a convex-shaped structure. The antenna shows a measured ultra-wide bandwidth starting at 2.7 GHz and ending at 13 GHz, for a VSWR less than 2. The antenna shows an omnidirectional pattern at the X–Y plane with a very low out-of-roundness all over the bandwidth. The group delay of the antenna is very stable, obtaining a variation less than 1 ns. As a result, very low dispersion over the entire bandwidth is presented, as well as low cross-polarization level. [ABSTRACT FROM PUBLISHER]

In this work, two techniques are introduced in order to reduce the dimensions of strip antennas. As an example, reduced size dipoles with no efficiency degradation are accomplished by introducing a stub load and a defected microstrip structure. For a specific configuration, a dual frequency operation can be achieved obtaining the same gain compared to a conventional strip dipole. Moreover, this technique gives the opportunity to get the same bandwidth for certain stub dimensions. Combining both techniques, the efficiency of the antenna and the cross-polarization ratio are kept with an antenna length reduction of 33%. [ABSTRACT FROM AUTHOR]