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This paper presents design of a varactor-loaded frequency-tunable ring microstrip antenna with reduced bias circuits. Two varactor diodes are mounted on square ring patch element fed by an L-probe to realize a frequency-tunable microstrip antenna. An L-shaped feeding probe is used to realize impedance matching of the ring microstrip antenna. Resonant frequency of the proposed antenna can be tuned...
This paper presents a frequency-tunable multi-ring microstrip antenna (MR-MSA) fed by an L-probe with varactor diodes. In order to realize a frequency-tunable multiband microstrip antenna, multiple ring patches are arranged concentrically and two varactor diodes are mounted on each ring patch. An L-shaped feeding probe is used to excite the ring patches. Resonant frequencies of the proposed antenna...
This paper presents a microstrip antenna (MSA) array on a narrow wall of a rectangular waveguide for linear polarization perpendicular to the axis. A two-element MSA array on a dielectric substrate fed by a longitudinal slot on the narrow wall of the rectangular waveguide is used as an element of the proposed array for grating lobe suppression due to the slot array arranged at a spacing of one guided...
This paper presents a dual-band frequency-tunable single-layer multi-ring microstrip antenna (MR-MSA) fed by an L-probe with varactor diodes. In order to develop a frequency-tunable multiband planar antenna, two split ring patches with two varactor diodes mounted on each ring patch are arranged concentrically on a dielectric substrate. An L-shaped feeding probe arranged in the same layer as the ring...
This paper presents measured performance of 15 GHz beam adjustable microstrip antenna arrays (BA-MSAAs). The BA-MSAA consists of a central patch element fed by a feeding line and two parasitic patches with a variable reactance circuit (VRC) adjacent to the center patch. Radiation pattern of the BA-MSAA is controlled by reactance values of the VRCs. In order to evaluate beam-shaping performance of...
This paper presents a frequency-tunable single-layer ring microstrip antenna fed by an L-probe with varactor diodes. In order to develop a frequency-tunable ring microstrip antenna, two varactor diodes are mounted on a square split ring patch antenna. An L-shaped feeding probe arranged in the same layer as the ring patch is used to excite the ring patch. The antenna structure is processed with a single-layer...
This paper presents measurement of a microstrip antenna array fed by transverse slots on a broad wall of the rectangular waveguide with standing wave excitation for linear polarization parallel to the axis. A series-fed two-element microstrip antenna array on a dielectric substrate excited by a transverses slot of the waveguide is used as an element of the proposed array for grating lobe suppression...
This paper presents design of a microstrip antenna array fed by transverse slots on a broad wall of the rectangular waveguide with standing wave excitation for linear polarization parallel to the axis. A series-fed two-element microstrip antenna array on a dielectric substrate excited by a transverses slot of the waveguide is used as an element of the proposed array. In this paper, radiation power...
This paper presents beam shaping performance of beam adjustable microstrip antenna arrays (BA-MSAAs) with narrow-with rectangular patch elements. The BA-MSAA consists of a central patch element fed by a feeding line and two parasitic patches with variable reactance circuits (VRCs) adjacent to the center patch. Radiation pattern of the BA-MSAA is controlled by the reactance values of the VRCs. In order...
This paper presents design and measurement of a linearly polarized radial line microstrip antenna array (RL-MSAA) with U-slot circular MSAs (C-MSAs). An circular microstrip antenna with U-shaped slot is used as a radiation element of the RL-MSAA. Radiation phase of the U-slot C-MSA is controlled by tuning a radius of the C-MSA and dimensions of the U-slot on the C-MSA; therefore, the desired phase...
Microstrip antennas (MSAs) and its arrays are applied to numerous purposes because of their features of small size, low profile, lightweight, and low cost in fabrication [1], [2]. For MSA arrays fed by microstrip lines for high gain use, feeding loss due of the microstrip lines becomes a problem. On the other hand, MSA arrays fed by a radial waveguide (RL-MSAA) are developed for high gain use such...
Multiband or wideband antennas are desired for various wireless applications such as mobile communication systems and car electronics. In accordance with these trends, multiband planar antennas with multi-ring microstrip antennas (MR-MSAs) have been developed [1], [2]. The MR-MSAs consist of multiple ring patches arranged concentrically on a double-layered dielectric substrate and an L-probe in the...
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