Abstract
This paper presents a 6-element series array quasi-lumped element resonator antenna. The proposed antenna employs an interdigital capacitor in parallel with a straight strip conductor whose center finger is shorted across the capacitor. An array configuration is imperative as the gain of a single quasi-lumped element arrangement was only moderate and specifically put at about 9.4 dBi which may not be adequate for long distance communica- tions. Relevant Equations for radiation pattern of the quasi- lumped element resonator (QLER) were derived and pre- sented. The proposed antenna array exhibits a gain en- hancement up to about 29.47% with a noticed size reduc- tion of 80 × 30 sq. mm. Compared to standard long wire antenna and other approaches of capacitive loaded long wire antennas, it was proved that the proposed antenna has a relatively better performance yet with significant size reduction. Consequently, it is an ideal candidate for MMIC designs and wireless communication applications.
Highlights
Quasi-lumped concept is widely used in microwave circuit design in recent times
The two-dimensional planes corresponding to E-plane and H-plane radiation patterns were measured with a combination of HP 83620B (10 MHz–20 GHz) signal generator, a transmitting dipole antenna, a rotating machine and Agilent 8565E (9 kHz–50 GHz) spectrum analyzer
The antenna under test (AUT) was attached to the rotating machine while the standard transmitting horn antenna was attached to a fixed stand
Summary
Quasi-lumped concept is widely used in microwave circuit design in recent times They are passive components whose size across any dimension is much smaller than the operating wavelength to ensure that there is no appreciable phase shift between the input and output terminals. Impedance transformation close to 20:1 is feasible using QLERs [1] These make them attractive candidates for antenna design as a result of their size reduction capability. When the size of the antenna is reduced, the single-element provides low value of directivity as a result of reduced radiative resistance. This leads to the problem of decreased radiative efficiency as the ratio of the antenna conductor to the radiated power decreases as frequency increases [2], [3]
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