Dual-Polarized (CP, LP, and Slant), Series-Fed, Monopulse Planar Array Antenna

• Published in: IEEE transactions on antennas and propagation 2024-10, Vol.72 (10), p.8070-8075
• Main Authors: Ahmad, Noman, Shoaib, Nosherwan, Nawaz, Haq, Abbasi, Qammer H., Nikolaou, Symeon
• Format: Article
• Language: English
• Subjects: Antenna arrays; Antennas; Bi-difference; bidirectional; circular polarization; Comparator circuits; Couplers; direction of arrival; dual polarization; Dual polarization (waves); Electric fields; Insertion loss; Linear antenna arrays; Linear polarization; Microstrip antenna arrays; monopulse; Monopulse antennas; series fed; slant polarization; Substrates; Superhigh frequencies; Vectors
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2024.3451169

A single-layered, series-fed monopulse planar array antenna system is presented, which reduces the complexity of corporate-fed monopulse antennas in terms of multilayered structures and number of 180° ring hybrid couplers as monopulse comparator circuit. The proposed antenna exploits only two 3-dB/180° hybrid couplers that results in reduced insertion loss of 3 dB. The proposed X-band monopulse antenna system exhibits the sum ( \Sigma ) patterns with dual (linear, circular, and slant) polarization, difference ( \Delta ) patterns with dual linear polarization, bi-difference patterns with dual (slant and circular) polarization. The prototype of the proposed antenna system has been fabricated using 0.762-mm-thick Rogers 4350B substrate ( {\varepsilon }_{r} =3.66 and \tan \delta =0.0031 ). The theoretical and experimental results confirm that −10-dB impedance bandwidth (or VSWR