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تعداد صفحات این فایل: ۲۱ صفحه

بخشی از مقاله انگلیسیعنوان انگلیسی:A new Millimeter-wave printed dipole phased array antenna using microstrip-fed coplanar stripline tee junctions~~en~~

Abstract

A new millimeter-wave printed twin dipole phased array antenna is developed at Ka band using a new microstrip-fed CPS tee junction, which does not require any bonding wires, air bridges, or via holes. The phased array used a piezoelectric transducer (PET) controlled tunable multitransmission line phase shifter to accomplish a progressive phase shift. A progressive phase shift of 88.8/spl deg/ is achieved with the 5 mm of perturber length when the PET has full deflection. Measured return loss of the twin dipole antenna is better than 10 dB from 29.5 to 30.35 GHz. Measured return loss of better than 15 dB is achieved from 30 to 31.5 GHz for a 1/spl times/8 phased array. The phased array antenna has a measured antenna gain of 14.4 dBi with 42/spl deg/ beam scanning and has more than 11 dB side lobe suppression across the scan.

۱ Introduction

P HASED array antenna systems usually associated with large and complex active device networks for phase shifters, which occupies large portion of the system expenses. Phased array used in military radar system requires low profile for invisibility against opponents. It also needs to be light weight especially in the applications of satellite communications. Correspondingly, the demands for low cost, low profile, small size, light weight, and less complicated phased array antenna systems are increasing nowadays for both commercial and military applications.

A printed dipole antenna satisfies the benefits of low profile, light weight, low cost and compact size, which is suitable for building phased arrays if proper phase shifters are provided. To construct a printed dipole array, several configurations have been proposed. Nesic et al. [1] reported a one-dimensional printed dipole antenna array fed by microstrip at 5.2 GHz. Scott [2] introduced a microstrip-fed printed dipole array using a microstrip-to-coplanar stripline (CPS) balun. In [1] and [2], the balun designs were not easy to match the impedance and the structures were too big and complicated to build an array. In 1998, a wideband microstrip-fed twin dipole antenna was introduced with double-sided structure operating at the frequency range from 0.61 to 0.96 GHz [3]. Zhu and Wu [4] developed a 3.5 GHz twin dipole antenna fed by a hybrid finite ground coplanar waveguide (FGCPW)/CPS Tee junction. An X-band monolithic integrated twin dipole antenna mixer was reported in [5] with devices directly integrated into the antenna, so no feeding network was necessary.

In this paper, a new planar printed dipole phased array antenna using a tunable phase shifter controlled by PET is presented at 30 GHz. The phased array antenna uses a new twin dipole antenna excited by a microstrip-fed CPS Tee junction [8]. The piezoelectric transducer (PET) controlled phase shifter does not require any solid-state devices and their associated driving circuits. The 1 8 twin dipole phased array antenna has compact size, low loss, low cost, light weight and reduced complexity as well as good beam scanning with low side lobe levels.

The PET controlled phase shifter was adopted for the low cost phased array antenna systems for the first time in [6] and [7]. In this structure, a dielectric perturber controlled by PET is used to introduce a progressive phase shift. The deflection takes place at the PET when the proper voltages are applied. Using this property of the PET, a dielectric perturber can have upward and downward movement according to the applied voltages. Consequently, if a transmission line is perturbed by a PET actuated dielectric perturber, its propagation constant will be changed. This phenomenon induces a variable phase shift along the transmission line controlled by PET. In [6] and [7], an end-fire Vivaldi antenna was used for covering a wide bandwidth, and a transition was required to feed antennas. Consequently, the system was large and bulky.

The new printed twin dipole phased array using a microstrip-fed CPS combined with a PET phase shifter provides low-cost, low-loss, low-profile, compact-size and low-complexity with simple antenna feeding.

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