An elliptically polarized axial-mode helical antenna with a conformal polarizer

This paper presents an elliptically polarized axial-mode helical antenna for UHF fuze radar applications with a conformal polarizer. The designed monofilar axial-mode helical antenna is circularly polarized. However, the circularly polarized antennas have polarization mismatch problem in above ground applications like fuze or altimeter radar. Therefore, antennas used in these applications should better be designed as linearly or elliptically polarized in order to obtain moderate received power levels. In this paper, the axial ratio of the designed antenna is increased to 7.6 dB from 1.35 dB at 850 MHz by use of a conformal polarizer. This antenna is measured in an anechoic chamber.
2nd European Conference on Antennas and Propagation, EuCAP 2007


Three Dimensional Microfabricated Broadband Patch and Multifunction Reconfigurable Antennae for 60 GHz Applications
Hunerli, H. V.; Mopidevi, H.; Cagatay, E.; Imbert, M.; Romeu, J.; Jofre, L.; Cetiner, B. A.; BIYIKLI, NECMİ (2015-05-17)
In this paper we present two antenna designs capable of covering the IEEE 802.11ad (WiGig) frequency band (57-66 GHz and 59-66 GHz respectively). The work below reports the design, microfabrication and characterization of a broadband patch antenna along with the design and microfabrication of multifunction reconfigurable antenna (MRA) in its static form excluding active switching. The first design is a patch antenna where the energy is coupled with a conductor-backed (CB) coplanar waveguide (CPW)-fed loop s...
A Wideband Fractal Antenna and Comparison of RF Rectifiers for Electromagnetic Energy Harvesting
Ozdemir, Huriye; Nesimoglu, Tayfun (2017-11-30)
This paper presents a wideband fractal antenna and compares two efficient rectifier topologies suitable for 2.45 GHz band. The combined fractal antenna and the rectifiers may be used for ambient RF energy harvesting from wireless LAN/Wi-Ei. The proposed fractal antenna covers the most frequently encountered frequency bands which are located around 1800 MHz, 2.1 GHz, 2.4 GHz and 2.45 GHz corresponding to standards like GSM/DCS, UMTS, ISM and WLAN respectively. The return loss of the proposed antenna is below...
Beam Steerable Traveling Wave Meander Line Antenna Using Varactor Diode for X-Band Applications
Gokalp, Nihan; Aydın Çivi, Hatice Özlem (2008-07-11)
This paper presents a novel beam steerable meander line antenna with varactor diode for X-band applications. Beam steering has been achieved by loading the arms of the meander line antenna with varactor diodes. The capacitances of the varactor diodes have been controlled by DC bias voltage. Instead of varactor diodes, RF-MEMS variable capacitances can be used to scan the beam. Since the insertion loss of MEMS capacitances are small compared to loss of varactor diodes, use of MEMS capacitors will increase th...
Design and realization a quasi yagi antenna array and its feed system printed on a ceramic substrate for x-band radar applications
Atabay, Berkay; Dural Ünver, Mevlüde Gülbin; Department of Electrical and Electronics Engineering (2019)
This thesis includes design, simulation, realization and measurement of a four-element quasi- Yagi antenna array printed on a ceramic substrate for X-band radar applications. The microstrip array antenna is designed using four quasi-Yagi antennas in a linear configuration and is printed on Alumina 99.6% substrate made by Coorstek Corporation. The antenna can fit into small areas because of compact structure due to the use of high dielectric constant substrates. In addition, the use of alumina ceramic substr...
A Novel Input Impedance Computation Method for Coaxial Probe Fed Microstrip Antennas by Utilizing Characteristic Modes
Cetin, Metehan; Alatan, Lale (2017-07-14)
A method to efficiently compute the input impedance of the coaxial probe fed microstrip antennas by using characteristic modes is proposed in this paper. The efficiency is achieved by defining a discontinuous source current at the feed location that models the current injected by the probe. The input impedance is simply expressed in terms of modal excitation coefficients and eigenvalues of each mode.
Citation Formats
M. Secmen, Ş. Demir, A. Hizal, and H. Ö. Aydın Çivi, “An elliptically polarized axial-mode helical antenna with a conformal polarizer,” Edinburgh, İngiltere, 2007, vol. 2007, Accessed: 00, 2022. [Online]. Available: