A bow-tie slot antenna fed by CPW is introduced. It is designed to work in the Ku-band around 15.5GHz. The proposed antenna is analysed both theoretically and experimentally. The presented results include the return loss and the radiation patterns. Two different geometries of the bow-tie antenna are presented and compared. The proposed antenna has several advantages such as a very large bandwidth, good control of its input impedance, and ease of fabrication. The proposed antenna has a dipole like radiation pattern which makes it suitable for mobile communication systems designed to work in the Ku-band. Introduction: Integrated circuit antennas are becoming increasingly popular owing to their advantages in terms of size, cost, and possible direct integration with communication system electronics.
This paper describes an -band 4 1 aperture-coupled series-fed electronically steerable microstrip leaky-wave antenna (LWA) array design, which has dual-beam radiation pattern and two-dimensional (2-D) beam-scanning capability. The LWA array is operated in the first higher order mode and excited by center-fed aperture coupled for dual-beam operation. The varactor-tuned phase shifters are placed between the antenna elements. The measured half-power beamwidth of the -plane and quasi--plane radiation patterns are less than 30 . By tuning the reverse dc bias of the varactor diodes, the main beam can be scanned in azimuth plane from 13 to +13 off broadside. In the elevation plane, the beam-scanning angle is close to 20 as the operating frequency tuned from 11.58-12.5 GHz. Taking into account each phase-shifter insertion loss and phase progression, the measured results compared closely with the theoretical prediction. The proposed antenna array is suitable for wireless communication and collision warning radar systems. Index Terms-Antenna arrays, aperture-coupled antennas, leaky-wave antennas, microstrip antennas.
the theoretical results of Fig. 2 of [I] show that for LJ =-I 2pm, there are two values of L, at which minimum second-harmonic distortion can be achieved. This cannot be predicted from eqn. 7. Furthermore, for M,, = O S the approximation of the term (d(l-mJ d(l+mJ) using eqn. 6 results in an error of the order of' 3.5%. Such an error cannot reliably yield harmonic distortions of the order of-81dB. It appears, therefore, that eqn. 6 of [l] the harmonic performance of the second cell.
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