A novel concept of a series feeding network of a microstrip antenna array has been shown. The proposed feeding network utilizes a four-port slot coupler as a three-way power divider, which is composed of two microstrip lines appropriately coupled through a slot within a common ground plane. The proposed power divider is used for simultaneous power distribution between two consecutive linear subarrays and between two 4 1 linear arrays constituting a single 8 1 linear subarray, where equal-amplitude and out-of-phase signals are required. Such a solution allows for realization of antenna arrays, in which all linear subarrays designed with the use of the "through-element" series feeding technique are fed at their centers from single transmission lines. The theoretical analysis as well as measurement results of the 8 8 antenna array operating within 10.5-GHz frequency range are shown.Index Terms-Antennas with reduced losses, microstrip antenna arrays, series-fed antennas, slot-coupled power divider.
A novel concept of a broad magic-T realization has been proposed. It ha the left-handed (LH) transmission line section increase of the coupled-line section coupling co for obtaining appropriate differential phase re a very compact and easy to manufacture desig presented concept has been verified by measurements of circuit operating within frequency range having coupling imbalance maximum phase error of 7°.Index Terms-3-dB 0°/180° directional c networks; coupled-line couplers; left-handed metamaterials
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