1. An antenna for an aircraft, the antenna being fitted with a coaxial cable provided with a coaxial connector comprising a core and shielding, the coaxial cable being suitable for being connected to a source for co-operating with the antenna, wherein the antenna comprises a cable-cutter device having a frame carrying two sharp edges, said antenna including an impedance-matching system connecting said frame to said core, said frame being a radiating member of the antenna.
2. An antenna according to claim 1, comprising a mounting panel in electrical contact with said frame, said shielding being in electrical contact with said mounting panel.
3. An antenna according to claim 2, wherein said mounting panel is a structural element of the fuselage of the aircraft.
4. An antenna according to claim 2, including electrically-conductive paint between said frame and said mounting panel.
5. An antenna according to claim 1, wherein said frame comprises a plurality of elements that are fastened to one another, and said antenna includes electrically-conductive paint between two distinct elements.
6. An antenna according to claim 1, wherein said impedance-matching system comprises a first wired connection including a first capacitor and connecting said core to said frame, said impedance-matching system including a second wired connection having a second capacitor, said second wired connection being fastened firstly to the mounting panel that co-operates with said shielding, and secondly to said first wired connection between the first capacitor and the core.
7. An antenna according to claim 1, including active means controlled by a control member to enable the antenna to be tuned to a plurality of frequencies.
8. An antenna according to claim 1, wherein said frame includes metal additions for optimizing the radiation of the antenna.
9. An aircraft having a fuselage, wherein the aircraft includes an antenna according to claim 1, said antenna being fitted with a coaxial cable provided with a coaxial connector comprising a core and shielding, and a cable-cutter device having a frame carrying two sharp edges, the antenna including an impedance-matching system connecting said frame to said core.
10. An aircraft according to claim 9, wherein said shielding and said frame are in electrical contact with said fuselage, said fuselage constituting a mounting panel for said antenna.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A transmission apparatus of a mobile communication terminal comprises:
a modem for outputting an intermediate frequency (IF) signal, and an auto gain control(AGC) signal;
a gain controller for adjusting a gain of the IF signal according to the AGC signal;
a power controlling circuit for adjusting the AGC signal according to temperature change of the terminal, and applying the adjusted AGC signal to the gain controller; and
a transmission signal processing block for converting the IF signal whose gain is adjusted, into a radio frequency (RF) signal, amplifying and bandwidth filtering the converted RF signal, then amplifying power of the RF signal as much as the RF signal can reach a receiving side, and emitting the amplified RF signal.
2. The apparatus of claim 1, wherein the transmission signal processing block comprises:
a mixer for converting the signal whose gain is adjusted, into a RF signal;
a drive amplifier for amplifying the RF signal;
a filter for bandwidth filtering the amplified signal; and
a power amplifier for sufficiently amplifying power of the signal as much as the filtered signal can be transmitted to a receiving side through the air.
3. The apparatus of claim 1, wherein the power controlling circuit is positioned between the modem and the gain controller.
4. The apparatus of claim 1, wherein the power controlling circuit comprises:
a thermistor whose one side is connected with the modem, and whose other side is connected with the gain controller; and
a resistor whose one side is earthed, and whose other side is connected with the thermistor in parallel.
5. The apparatus of claim 1, wherein the power controlling circuit comprises:
a first resistor whose one side is connected with the modem;
a second resistor whose one side is connected with the first resistor, and whose other side is connected with the gain controller; and
a thermistor whose one side is earthed, and whose other side is connected with the first and second resistors in parallel.
6. The apparatus of claim 1, wherein the power controlling circuit comprises:
an AGC adjuster for adjusting an AGC signal of the modem according to temperature change of the terminal, and applying the adjusted AGC signal to the gain controller; and
a signal amplifier for amplifying the AGC signal applied to the gain controller at a voltage level as much as the modem can recognize, and transmitting the amplified AGC signal to the modem.
7. The apparatus of claim 6, wherein the AGC adjuster comprises:
a thermistor whose one side is connected with the modem, and whose other side is connected with the gain controller; and
a resistor whose one side is earthed, and whose other side is connected with the thermistor in parallel.
8. The apparatus of claim 6, wherein the AGC adjuster comprises:
a first resistor whose one side is connected with the modem;
a second resistor whose one side is connected with the first resistor, and whose other side is connected with the gain controller; and
a thermistor whose one side is earthed, and whose other side is connected with the first and second resistors in parallel.
9. The apparatus of claim 6, wherein the signal amplifier is implemented using an operational amplifier.