Design of Compact Reconfigurable Dual Frequency Microstrip Antennas Using Varactor Diodes

Abstract

Abstract-The design of a compact, single feed, dual frequency dual polarized and electronically reconfigurable microstrip antenna is presented in this paper. A square patch loaded with a hexagonal slot having extended slot arms constitutes the fundamental structure of the antenna. The tuning of the two resonant frequencies is realized by varying the effective electrical length of the slot arms by embedding varactor diodes across the slots. A high tuning range of 34.43% (1.037-1.394 GHz) and 9.27% (1.359-1.485 GHz) is achieved for the two operating frequencies respectively, when the bias voltage is varied from 0 to −30 V. The salient feature of this design is that it uses no matching networks even though the resonant frequencies are tuned in a wide range with good matching below −10 dB. The antenna has an added advantage of size reduction up to 80.11% and 65.69% for the two operating frequencies compared to conventional rectangular patches.

Design and Fabrication of One Novel Multi-Polarized Multi-Layer Wideband Planar Antenna

“…The 1-element, 2-element, 4-element, and 16-element antenna arrays are constructed and measured, results show good agreement to simulation. Figure 1 is the configuration of the multi-layer planar antenna proposed in this paper [7][8][9][10]. It has three substrate layers and four metal layers.…”

K15 Nematic Phase Liquid Crystal Material Based Double-Dipole Reconfigurable Antenna

“…5 In the proposed antenna, by changing the length of the strips provided in the antenna frequency reconfigurability can be done effectively. 6 The design consists of different combinations in which the length of the Coplanar strips is varied such that a peak gain of 4.609 dB is obtained in multi band range In addition to this, other combinations 0100,1000,1100,1010of the lengths are considered which are operated in wide band with Peak gain of 4.1dB, 3.8 dB, 5.0 dB, 4 Nematic phase state liquid crystal is a non linear dielectric material in which the dielectric constant can be changed between two extreme states that are described by the orientation of the liquid crystal molecules, either parallel or perpendicular to the excited RF field. 11,12 The effective dielectric anisotropy can be defined as: Our intention is to use the liquid crystal and liquid crystal polymer based materials as substrate materials in the design of microstrip patch antennas.…”

“…3 Multiple functions need to be performed on a single convergence. 4 A single antenna is used in wireless devices such as cellular telephone, laptops and other wireless devices. These antennas are usually monopole or micro strip antenna based which are having the capability to access multiple frequencies.…”

Microstrip Square Ring Antenna for Dual-Band Operation

“…Miniaturized microstrip antennas played an important role in improving the performance and reducing the overall size of wireless devices [1]. In an effort towards multi-functional wireless terminals, several designs of microstrip dualband, multiband and wideband antennas with same and orthogonal polarizations have been reported recently [2][3][4][5][6][7][8][9]. Multi-band antennas with a single radiator are desirable in most applications [6].…”