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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 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 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...
This paper presents single-layer multiband microstrip antennas (MSAs) fed by a co-planar waveguide (CPW) for linear and circular polarizations (LP and CP). Multiple square ring MSAs with concentric arrangement are placed on the top surface of a dielectric substrate and are fed by a CPW formed on the back surface of the substrate. The ring MSAs can radiate LP at the respective resonant frequencies...
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