Abstract
A two-function filtering antenna device in the 1-2 GHz band is investigated. The device radiates or receives electromagnetic waves of circular polarization and simultaneously performs the function of a second-order bandpass filter. The considered design consists of a dual-mode printed antenna-resonator coupled with two non-radiating resonators which are fed by a quadrature balanced power divider. Using the model in the form of an equivalent circuit the main features of the structure synthesis and its tuning are analyzed including potentially achievable characteristics. The results of the numerical simulations using electromagnetic software are presented in comparison with the experimental characteristics for the prototype made of high-permittivity high-quality ceramics. It is found that the proposed design is characterized by an almost two-fold increase of the operating frequency band compared to the resonant antenna itself while maintaining a low level of cross-polarization within the passband. It is also shown that the design has the frequency response of the second-order bandpass filter.
Highlights
Recent years have seen increased interest in the research and development of multifunctional antennas
The antenna provides coupling of the RF unit with free space through radiating or receiving electromagnetic waves, and it ideally does not contribute to the amplitude-frequency characteristic (AFC) of the unit
Because a small-size antenna is a sufficiently effective resonator and a matching circuit is a combination of narrowband resonators [2], the entire structure of an antenna with a matching circuit is a bandpass filter, which provides signal transmission in a given frequency band
Summary
Recent years have seen increased interest in the research and development of multifunctional antennas. Because a small-size antenna is a sufficiently effective resonator and a matching circuit is a combination of narrowband resonators [2], the entire structure of an antenna with a matching circuit is a bandpass filter, which provides signal transmission in a given frequency band. A circular polarization antenna with frequency-selective characteristics was considered in [6] It uses a band-stop notch filter that suppresses higher-order resonances. The AF studied in [7] incorporated a filter made of four printed resonators of complex shape This design provided the elliptic-type AFC with zeros of the transmission coefficient in the stop band, leading to a high level of signal suppression outside the bandpass. Such an integration of RR and NRR is typical for AFs of the second type, and it can provide a stable radiation pattern in the operating frequency band. To minimize the AF’s dimensions, using dielectric materials with high relative permittivity values εr > 40 is necessary
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