Double triangular monopole-like antenna with reconfigurable single/dual-wideband circular polarization

Abstract

A polarization and frequency reconfigurable circularly polarized (CP) antenna is proposed based on a novel bilateral switching mechanism. Two triangular monopole antennas are connected to each other in an L‐shaped form by a narrow link to produce a CP operation. In the proposed technique, 4 PIN‐diode‐based switches are designed with desired insertion loss and isolation, and only 2 DC‐voltage controllers. These switches are located on the links and the feed lines to realize a polarization reconfigurable feature including both right‐hand CP (RHCP) and left‐hand CP (LHCP) modes. Moreover, 2 CP states, a single wideband operation and a dual‐band operation, can be supported by this mechanism. In a special performance of the switches, CP reconfigurability can be obtained in a narrow‐band mode around 2.45 GHz. Two general simulations are performed based on the simple microstrip links and a diode‐circuit model. The measured results exhibit a wide overlapped bandwidth (AR < 3 dB and VSWR < 2) of 44.4% (1.63–2.56 GHz) with a peak gain of 2.88 dBi in the first state and 5.5% (1.22∼1.29GHz) and 20.6% (2.12–2.61 GHz) with the peak gains of 0.52 and 3.0 dBi in the second state, respectively. A wide beamwidth is obtained more than 75°. This work is appropriate for L‐ and S‐band CP diversity applications.

Design optimization of a pattern reconfigurable microstrip antenna using differential evolution and 3D EM simulation‐based neural network model

“…The design complexity of reconfigurable pattern antennae are relatively high; however, there had been many studies that provides solutions for this challenging design problem such as usage of mechanical gears, modification of feeding systems phase, and modifications of surface currents via use of switches …”

“…[7][8][9][10][11][12][13][14][15][16][17][18][19][20] The design complexity of reconfigurable pattern antennae are relatively high; however, there had been many studies that provides solutions for this challenging design problem such as usage of mechanical gears, 21 modification of feeding systems phase, 22 and modifications of surface currents via use of switches. [23][24][25][26][27][28][29] One of the commonly used methods for design of reconfigurable pattern antenna is integration of PIN diodes on the surface of the antenna design. Microstrip antenna are optimal design due to their low cost, low profile, conformal ability, and easiness to be integrated with PIN diodes or RF-MEMS switches.…”

Microstrip tapered traveling wave antenna for wide range of beam scanning in X‐ and Ku‐bands

“…In human detection and scanning applications, the RADAR system requires a narrow beam pattern with fast steering ability where the basic radar functions such as pattern control, scanning, targeting has a critical importance. Although the design procedure of these types of antenna models are relatively complex compared to traditionally designs there have been series of works to achieved this challenging problem, usage of mechanical gears, modification of feeding systems phase, and modifications of surface currents via use of switches, or by use of substrate integrated waveguide designs …”

A polarization‐reconfigurable array design based on mode combination technique

“…There are three typical techniques to realize polarization reconfiguration by utilizing active RF switches, such as PIN diodes and RF‐MEMS, to different parts of an antenna system. The first one is to use a reconfigurable feeding network to feed different parts of the antenna .…”

“…The first one is to use a reconfigurable feeding network to feed different parts of the antenna . The second one is directly introducing controllable perturbation segments on the antenna's radiating part , . For examples, in literatures, polarization‐reconfigurable E‐shaped patch antennas were proposed, which are capable of radiating either right‐hand circular polarization (RCP) or left‐hand circular polarization (LCP) waves by directly introducing perturbation in an E‐shaped patch.…”