Harmonic radar is a kind of radar that uses the higher-order harmonics reflected by the target for nonlinear target detection. Eavesdropping equipment usually has non-linear devices, so harmonic radar can be used in the field of anti-investigation to detect voice recorders and eavesdroppers. In this paper, a kind of harmonic radar based on dual-transmitter and dual-receiver is designed to meet the needs of anti-investigation of eavesdropping equipment, and three kinds of electronic targets such as recording pen are tested and verified. The verification results show that the device can detect nonlinear electronic targets well.
In order to meet the needs of nonlinear target long-range detection, a pair of transmitting and receiving helical antenna for high-power hand-held harmonic radar are described in this paper. The operating frequency of the transmitting antenna is 3.0 GHz and the operating frequency of the receiving antenna is 6.0 GHz and 9.0 GHz. Simulated results show that both two antennas are left-handed circular polarized. The transmitting antenna has an overall impedance bandwidth (VSWR ≤ 2) from 2.6 GHz to 3.7 (24.7%), and an axial ratio (AR) bandwidth (AR ≤ 3 dB) from 2.9 GHz to 3.45 GHz (16.2%). The receiving antenna has an overall impedance bandwidth (VSWR ≤ 2) from 5.8 GHz to 10.5 GHz and an axial ratio (AR) bandwidth (AR ≤ 3 dB) from 5.8 GHz to 10.5 GHz (16.2%) for 2nd and 3rd harmonic. Maximum gain of 9 dBic for transmitting antenna and 10.7 dBic for receiving antenna are obtained as well.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.