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This is an IEEE Distinguished Lecture from Antennas and Propagation Society. Since the discovery of efficient leaky-wave radiation from a slot in a wave guide by Oliner, leaky-wave antennas have attracted a lot of interest in applications that require beam scanning. Printed planar configurations of LWAs have become very popular, due to low cost. Half-width LWAs based on microstrip lines and substrate-integrated-wave...
This paper presents a brief analysis of the existing methods of reducing microstrip device dimensions. This paper also presents a miniaturization method based on using artificial transmission lines, which possess characteristics similar to those of quarter-wave transmission lines. Based on this method, a compact directional coupler, which divides the power in a 1:2 ratio, was designed and manufactured...
A novel parallel-coupled microstrip feed line is proposed. The feed relies on the capacitance contribution arising from the capacitances occurring at adjacent split sections in order to lower the high intrinsic input impedance common to microstrip patch antennas. It is expected that the capacitance contribution will enhance the frequency pattern of the microstrip passive and thus overcome the narrow...
In this paper, an analysis of the Fat Patch Antenna with the extraordinary parasitic patch is described. For the numerical simulations, the Full Wave — CST Microwave Studio software is used. The element of the antenna is fed by the L-probe partially implemented in PCB. An excellent impedance matching is obtained (< −26 dB in the design frequency band 4.4–5 GHz). The radiation characteristics are...
Within this paper four different surface finishes, as well as plain copper tracks, were investigated to evaluate their impact on insertion loss on Microstrip (MS) ring resonators. The selected surface finishes are electroless nickel immersion gold (ENIG), electroless nickel electroless palladium immersion gold (ENEPIG), immersion tin, and gold. All of the examined platings consist of a varying number...
We present a triple-band microstrip passive using a quasi-hybrid-ring coupler feeding. The proposed hybrid-ring feeder is based on the rat-race coupling mechanism using a balanced mode arrangement. The input excitation energy is split into two superimposed excitation electromagnetic waves travelling in opposite direction though with equal amplitude but with 1800 phase difference. The proposed feeder...
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