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In this article, a simple coaxial‐feed filtering patch antenna based on stub‐loaded resonator is investigated and analyzed. Owning to the addition of a pair of parasitic stubs, the original rectangular patch antenna acquires a new resonance point and an out‐side radiation null beyond the upper band edge. Then, by establishing a transverse path (introducing connected stubs), the radiating and filtering responses at lower band have been enhanced accordingly. In short, it operates like a three‐order filter with two‐constrained radiation nulls along the passband outside. The novel design has been verified by machining and testing, which meets the expected lately. A fractional bandwidth of 28% and a stable realized gain of 5.8 dBi in‐band are finally measured, and more it also reaches a higher radiation efficiency of 83%. Besides, it exhibits a unidirectional radiation pattern with a low‐cross polarization less than −20 dB in the boresight direction. [ABSTRACT FROM AUTHOR]

In this paper, the behavior of radiation and coupling reduction between two groove-backed antennas is investigated. An electric line current is placed inside a rectangular groove in a perfectly conducting plane. Fourier transform and series techniques are employed to express the scattered field. Boundary conditions are enforced to obtain simultaneous equations for the discrete modal coefficients, which are then solved in order to calculate the radiated and coupled fields. The behavior of coupling reduction and radiation is discussed in terms of the antenna geometries. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 36: 285–289, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10743 [ABSTRACT FROM AUTHOR]